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pageFillDescription: 'java表达式解析器（支持自定义函数以及操作符）, 说明, 执行逻辑, 优化, 注意, 1.引入依赖, 2.关于自定义函数介绍, 重写自定义函数父类, 自定义函数示例, 3.关于自定义操作符的介绍, 自定义操作符构造方法参数介绍, 默认的符号优先级, 自定义操作符示例, 4.工具类, 方法介绍, 工具类实现, 5.使用示例表达式解析器支持自定义函数以及操作符说明下面的工具类适用于类似这种表达式的解析需要自定义函数并且函数还附带字符串等非数字类型的参数执行逻辑接受一个需要计算的表达式以及计算表达式所需要的参数信息参数可空获取传入参数的方式将函数中的字符串参数替换为纯数字参数并且记录改对应关系在计算是自定替换为原始字符串参数创建解析器使用的获取对应的自定义函数和操作符并添加到所创建的解析器中优化工具类中使用的都是线程变量确保每个线程的参数以及映射信息都是独立的并且在每次公式计算完毕进行清空公式中还定义了搜集异常信息的变量如果想保留异常信息调用异常信息进行存储公式解析完毕会将该异常信息抛出使用自动获取自定义的函数和操作符添加到表达式解析器中无需手动添加注意一定要严格按照你自定义函数所配置的函数名称参数个数以及自定义的操作符来编写表达式也就是严格控制表达式的内容如果表达式中出现了没有定义的其他函数或操作符会直接报错引入依赖关于自定义函数介绍如果你解析的公式函数不包含参数或者你的参数为数字那么你可以直接继承如果你的自定义函数中包含的参数是字符串或者其他类型的信息那么我建议你看下我写的自定义类重写自定义函数父类兼容和自定义表达式取值自动将参数转换为原始字符串函数参数信息计算值自定义函数示例方法会自动将你的函数替换为原始字符串创建完类你需要声明你的函数名称以及你的函数参数个数代表参数个数不确定这里写你自己的函数计算逻辑关于自定义操作符的介绍自定义操作符需要继承自定义操作符构造方法参数介绍参数名类型含义操作符符号例如操作符优先级值越高优先级越高例如的优先级高于操作符是否是左结合性例如和是左结合幂运算是右结合是否是布尔操作符布尔操作符处理值例如和是否是一元操作符只有一个操作数例如中的是一元操作符默认的符号优先级操作符描述优先级结合性加法左结合减法左结合乘法左结合除法左结合幂运算右结合自定义操作符示例工具类方法介绍公式解析工具类用于将表达式函数中参数是字符串的参数替换为数字并且将对应关系存储到变量中还原被替换的参数信息工具类实现字符串参数公式中不能包含字符串测量点映射计算公式所需额外参数信息错误信息自动注册自定义函数公式解析计算公式取值所需要的参数创建表达式添加自定义函数添加自定义操作符计算公式除零异常计算结束清空当前线程的局部变量预处理公式将引号包裹的字符串替换为占位符每找到一个匹配项就生成一个占位符并将原始字符串存入映射在函数调用时将占位符恢复为原始字符串使用示例公式测试',
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datetime="2024-11-17T06:10:54.000Z" title="更新于 2024-11-17 14:10:54">2024-11-17</time></header><h1>java表达式解析器（支持自定义函数以及操作符）</h1>
<h2 id="说明">说明</h2>
<div class="note info no-icon flat"><p>下面的工具类适用于类似这种表达式 <strong>VAR(‘001d’)+VAR(‘test1’)</strong> 的解析，需要自定义函数并且函数还附<strong>带字符串等非数字类型</strong>的参数</p>
<h3 id="执行逻辑">执行逻辑</h3>
<ol>
<li>接受一个需要计算的表达式以及计算表达式所需要的参数信息(参数可空)，获取传入参数的方式<mark class="hl-label green">FormalAnalysis.param.get()</mark></li>
<li>将函数中的字符串参数替换为纯数字参数 <strong>VAR(‘001d’)+VAR(‘test1’)</strong> -> <strong>VAR(1)+VAR(2)</strong>，并且记录改对应关系，在计算是自定替换为原始字符串参数</li>
<li>创建解析器Expression</li>
<li>使用SpringBoot的ApplicationContext获取对应的<strong>自定义函数和操作符</strong>，并添加到所创建的解析器中</li>
</ol>
<h3 id="优化">优化</h3>
<ol>
<li>工具类中使用的都是线程变量ThreadLocal，确保每个线程的参数以及映射信息都是独立的，并且在每次公式计算完毕进行清空</li>
<li>公式中还定义了搜集异常信息的list变量warnContent，如果想保留异常信息调用<mark class="hl-label green">FormalAnalysis.warnContent.get().add(异常信息)</mark> 进行存储，公式解析完毕会将该异常信息抛出</li>
<li>使用ApplicationContext自动获取自定义的函数和操作符，添加到表达式解析器中，无需手动添加</li>
</ol>
</div>
<h2 id="注意">注意</h2>
<div class="note danger no-icon flat"><p>一定要严格按照你自定义函数所配置的函数名称、参数个数以及自定义的操作符来编写表达式，也就是严格控制表达式的内容<br>
如果表达式中出现了没有定义的其他函数或操作符，会直接报错</p>
</div>
<h2 id="1-引入依赖">1.引入依赖</h2>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><dependency></span><br><span class="line"> <groupId>com.udojava</groupId></span><br><span class="line"> <artifactId>EvalEx</artifactId></span><br><span class="line"> <version><span class="number">2.7</span></version></span><br><span class="line"></dependency></span><br></pre></td></tr></table></figure>
<h2 id="2-关于自定义函数介绍">2.关于自定义函数介绍</h2>
<div class="note warning no-icon flat"><p>如果你解析的公式函数不包含参数或者你的参数为数字，那么你可以直接继承<mark class="hl-label purple">AbstractFunction</mark><br>
如果你的自定义函数中包含的参数是字符串或者其他类型的信息，那么我建议你看下我写的自定义类<mark class="hl-label purple">CustomAbstractFunction</mark></p>
</div>
<h3 id="重写自定义函数父类">重写自定义函数父类</h3>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keyword">class</span> <span class="title class_">CustomAbstractFunction</span> <span class="keyword">extends</span> <span class="title class_">AbstractFunction</span> {</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="keyword">public</span> Expression.LazyNumber <span class="title function_">lazyEval</span><span class="params">(List<Expression.LazyNumber> lazyParams)</span> {</span><br><span class="line"> <span class="keyword">return</span> <span class="built_in">super</span>.lazyEval(lazyParams);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> String <span class="title function_">restoreOriginalString</span><span class="params">(Integer s)</span> {</span><br><span class="line"> <span class="keyword">return</span> FormalAnalysis.restoreOriginalString(s);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">protected</span> <span class="title function_">CustomAbstractFunction</span><span class="params">(String name, <span class="type">int</span> numParams)</span> {</span><br><span class="line"> <span class="built_in">super</span>(name, numParams);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="keyword">public</span> BigDecimal <span class="title function_">eval</span><span class="params">(List<BigDecimal> parameters)</span> {</span><br><span class="line"> List<String> param = <span class="keyword">new</span> <span class="title class_">ArrayList</span><>();</span><br><span class="line"> <span class="keyword">for</span> (<span class="type">int</span> <span class="variable">i</span> <span class="operator">=</span> <span class="number">0</span>; i < parameters.size(); i++) {</span><br><span class="line"></span><br><span class="line"> <span class="comment">//兼容VAL BEG 和 END</span></span><br><span class="line"> <span class="keyword">if</span> (StrUtil.isEmpty(restoreOriginalString(parameters.get(i).intValue()))) {</span><br><span class="line"> param.add(i, parameters.get(i).toString());</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="type">String</span> <span class="variable">s</span> <span class="operator">=</span> restoreOriginalString(parameters.get(i).intValue());</span><br><span class="line"> param.add(i, s);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> customEval(param);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 自定义表达式取值（自动将参数转换为原始字符串）</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> parameters 函数参数信息</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> 计算值</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> BigDecimal <span class="title function_">customEval</span><span class="params">(List<String> parameters)</span> {</span><br><span class="line"> <span class="keyword">return</span> <span class="literal">null</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h3 id="自定义函数示例">自定义函数示例</h3>
<ul>
<li>customEval方法会自动将你的函数替换为原始字符串</li>
<li>创建完类你需要声明你的函数名称以及你的函数参数个数，-1代表参数个数不确定</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">VAR</span> <span class="keyword">extends</span> <span class="title class_">CustomAbstractFunction</span> {</span><br><span class="line"> <span class="keyword">public</span> <span class="title function_">VAR</span><span class="params">()</span> {</span><br><span class="line"> <span class="built_in">super</span>(<span class="string">"VAR"</span>, <span class="number">1</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="keyword">public</span> BigDecimal <span class="title function_">customEval</span><span class="params">(List<String> parameters)</span> {</span><br><span class="line"></span><br><span class="line"> <span class="type">String</span> <span class="variable">p1</span> <span class="operator">=</span> parameters.get(<span class="number">0</span>);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//这里写你自己的函数计算逻辑</span></span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> BigDecimal.ZERO;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h2 id="3-关于自定义操作符的介绍">3.关于自定义操作符的介绍</h2>
<div class="note primary no-icon flat"><p>自定义操作符需要继承<mark class="hl-label purple">AbstractOperator</mark></p>
</div>
<h3 id="自定义操作符构造方法参数介绍">自定义操作符构造方法参数介绍</h3>
<table>
<thead>
<tr>
<th style="text-align:center">参数名</th>
<th style="text-align:center">类型</th>
<th>含义</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:center">oper</td>
<td style="text-align:center">String</td>
<td>操作符符号，例如 “+”、“-”、“*”、“/”。</td>
</tr>
<tr>
<td style="text-align:center">precedence</td>
<td style="text-align:center">int</td>
<td>操作符优先级，值越高优先级越高。例如 * 的优先级高于 +。</td>
</tr>
<tr>
<td style="text-align:center">leftAssoc</td>
<td style="text-align:center">boolean</td>
<td>操作符是否是<strong>左结合性</strong>，例如：+ 和 * 是左结合，^（幂运算）是右结合。</td>
</tr>
<tr>
<td style="text-align:center">booleanOperator</td>
<td style="text-align:center">boolean</td>
<td>是否是布尔操作符，布尔操作符处理 true/false 值，例如 && 和</td>
</tr>
<tr>
<td style="text-align:center">unaryOperator</td>
<td style="text-align:center">boolean</td>
<td>是否是<strong>一元操作符</strong>（只有一个操作数），例如 -a 中的 - 是一元操作符。</td>
</tr>
</tbody>
</table>
<h3 id="默认的符号优先级">默认的符号优先级</h3>
<table>
<thead>
<tr>
<th style="text-align:center">操作符</th>
<th>描述</th>
<th style="text-align:center">优先级 (precedence)</th>
<th style="text-align:center">结合性 (leftAssoc)</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:center">+</td>
<td>加法</td>
<td style="text-align:center">20</td>
<td style="text-align:center">true （左结合）</td>
</tr>
<tr>
<td style="text-align:center">-</td>
<td>减法</td>
<td style="text-align:center">20</td>
<td style="text-align:center">true （左结合）</td>
</tr>
<tr>
<td style="text-align:center">*</td>
<td>乘法</td>
<td style="text-align:center">30</td>
<td style="text-align:center">true （左结合）</td>
</tr>
<tr>
<td style="text-align:center">/</td>
<td>除法</td>
<td style="text-align:center">30</td>
<td style="text-align:center">true （左结合）</td>
</tr>
<tr>
<td style="text-align:center">^</td>
<td>幂运算</td>
<td style="text-align:center">40</td>
<td style="text-align:center">false（右结合）</td>
</tr>
</tbody>
</table>
<h3 id="自定义操作符示例">自定义操作符示例</h3>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">MaxOperator</span> <span class="keyword">extends</span> <span class="title class_">AbstractOperator</span> {</span><br><span class="line"> <span class="keyword">public</span> <span class="title function_">MaxOperator</span><span class="params">()</span> {</span><br><span class="line"> <span class="built_in">super</span>(<span class="string">">>"</span>, <span class="number">30</span>, <span class="literal">true</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="keyword">public</span> BigDecimal <span class="title function_">eval</span><span class="params">(BigDecimal v1, BigDecimal v2)</span> {</span><br><span class="line"> <span class="keyword">return</span> v1.max(v2);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h2 id="4-工具类">4.工具类</h2>
<h3 id="方法介绍">方法介绍</h3>
<ul>
<li>analysisCal
<ul>
<li>公式解析工具类</li>
</ul>
</li>
<li>preprocessExpression
<ul>
<li>用于将表达式函数中参数是<mark class="hl-label pink">字符串的参数替换为数字</mark> ，并且将对应关系存储到<mark class="hl-label pink">mapping</mark> 变量中</li>
</ul>
</li>
<li>restoreOriginalString
<ul>
<li>还原被替换的参数信息</li>
</ul>
</li>
</ul>
<h3 id="工具类实现">工具类实现</h3>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">FormalAnalysis</span> {</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * key->id,value->字符串参数</span></span><br><span class="line"><span class="comment"> * 公式中不能包含字符串</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">final</span> ThreadLocal<Map<Integer, String>> mapping = ThreadLocal.withInitial(HashMap::<span class="keyword">new</span>);</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 测量点映射id</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> ThreadLocal<Integer> placeholderCounter = ThreadLocal.withInitial(() -> <span class="number">0</span>);</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 计算公式所需额外参数信息</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">final</span> ThreadLocal<Map<String, Object>> param = ThreadLocal.withInitial(HashMap::<span class="keyword">new</span>);</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 错误信息</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">final</span> ThreadLocal<List<String>> warnContent = ThreadLocal.withInitial(ArrayList::<span class="keyword">new</span>);</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 自动注册自定义函数</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="meta">@Resource</span></span><br><span class="line"> <span class="keyword">private</span> ApplicationContext applicationContext;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 公式解析计算</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> formula 公式</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> param 取值所需要的参数</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> BigDecimal <span class="title function_">analysisCal</span><span class="params">(String formula, Map<String, Object> param)</span> {</span><br><span class="line"> <span class="type">BigDecimal</span> <span class="variable">eval</span> <span class="operator">=</span> <span class="literal">null</span>;</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> FormalAnalysis.param.set(param);</span><br><span class="line"></span><br><span class="line"> formula = preprocessExpression(formula);</span><br><span class="line"> <span class="comment">// 创建表达式</span></span><br><span class="line"> <span class="type">Expression</span> <span class="variable">expression</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Expression</span>(formula);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> <span class="comment">//添加自定义函数</span></span><br><span class="line"> Map<String, AbstractFunction> fun = applicationContext.getBeansOfType(AbstractFunction.class);</span><br><span class="line"> <span class="keyword">for</span> (AbstractFunction abstractFunction : fun.values()) {</span><br><span class="line"> expression.addFunction(abstractFunction);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//添加自定义操作符</span></span><br><span class="line"> Map<String, AbstractOperator> oper = applicationContext.getBeansOfType(AbstractOperator.class);</span><br><span class="line"> <span class="keyword">for</span> (AbstractOperator abstractFunction : oper.values()) {</span><br><span class="line"> expression.addOperator(abstractFunction);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 计算公式</span></span><br><span class="line"> eval = expression.eval();</span><br><span class="line"> <span class="keyword">if</span> (CollUtil.isNotEmpty(warnContent.get())) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="title class_">RuntimeException</span>(StringUtils.join(warnContent.get().stream().distinct().collect(Collectors.toList()), System.lineSeparator()));</span><br><span class="line"> }</span><br><span class="line"> } <span class="keyword">catch</span> (ArithmeticException e) {<span class="comment">//除零异常</span></span><br><span class="line"> <span class="keyword">if</span> (CollUtil.isNotEmpty(warnContent.get())) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="title class_">RuntimeException</span>(StringUtils.join(warnContent.get().stream().distinct().collect(Collectors.toList()), System.lineSeparator()));</span><br><span class="line"> }</span><br><span class="line"> eval = BigDecimal.ZERO;</span><br><span class="line"> } <span class="keyword">finally</span> {</span><br><span class="line"> <span class="comment">// 计算结束，清空当前线程的局部变量</span></span><br><span class="line"> FormalAnalysis.mapping.remove();</span><br><span class="line"> FormalAnalysis.placeholderCounter.remove();</span><br><span class="line"> FormalAnalysis.warnContent.remove();</span><br><span class="line"> FormalAnalysis.param.remove();</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> eval.setScale(<span class="number">4</span>, RoundingMode.HALF_UP);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 预处理公式，将引号包裹的字符串替换为占位符</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> String <span class="title function_">preprocessExpression</span><span class="params">(String formula)</span> {</span><br><span class="line"></span><br><span class="line"> formula = formula.replace(ValParamEnum.BEG.getName(), ValParamEnum.BEG.getId().toString());</span><br><span class="line"> formula = formula.replace(ValParamEnum.END.getName(), ValParamEnum.END.getId().toString());</span><br><span class="line"></span><br><span class="line"> <span class="type">Pattern</span> <span class="variable">pattern</span> <span class="operator">=</span> Pattern.compile(<span class="string">"'([^']*)'"</span>);</span><br><span class="line"> <span class="type">Matcher</span> <span class="variable">matcher</span> <span class="operator">=</span> pattern.matcher(formula);</span><br><span class="line"> <span class="type">StringBuffer</span> <span class="variable">sb</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">StringBuffer</span>();</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 每找到一个匹配项，就生成一个占位符，并将原始字符串存入映射</span></span><br><span class="line"> <span class="keyword">while</span> (matcher.find()) {</span><br><span class="line"> <span class="type">String</span> <span class="variable">originalString</span> <span class="operator">=</span> matcher.group(<span class="number">1</span>);</span><br><span class="line"> placeholderCounter.set(placeholderCounter.get() + <span class="number">1</span>);</span><br><span class="line"> mapping.get().put(placeholderCounter.get(), originalString);</span><br><span class="line"> matcher.appendReplacement(sb, placeholderCounter.get() + <span class="string">""</span>);</span><br><span class="line"> }</span><br><span class="line"> matcher.appendTail(sb);</span><br><span class="line"> System.out.println(sb);</span><br><span class="line"> <span class="keyword">return</span> sb.toString();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 在函数调用时，将占位符恢复为原始字符串</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> String <span class="title function_">restoreOriginalString</span><span class="params">(Integer placeholder)</span> {</span><br><span class="line"> <span class="keyword">return</span> mapping.get().get(placeholder);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h2 id="5-使用示例">5.使用示例</h2>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@RestController</span></span><br><span class="line"><span class="meta">@RequestMapping("formula")</span></span><br><span class="line"><span class="meta">@Api(tags = "公式测试")</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">FormalTestController</span> {</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Resource</span></span><br><span class="line"> FormalAnalysis formalAnalysis;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@GetMapping</span></span><br><span class="line"> <span class="meta">@ApiOperation("test")</span></span><br><span class="line"> <span class="keyword">public</span> ApiResponse <span class="title function_">test</span><span class="params">()</span> {</span><br><span class="line"> <span class="type">String</span> <span class="variable">formal</span> <span class="operator">=</span> <span class="string">"VAR('001d')+VAR('test1')"</span>;</span><br><span class="line"> <span class="type">BigDecimal</span> <span class="variable">bigDecimal</span> <span class="operator">=</span> formalAnalysis.analysisCal(formal, <span class="keyword">new</span> <span class="title class_">HashMap</span><>());</span><br><span class="line"> System.out.println(bigDecimal);</span><br><span class="line"> <span class="keyword">return</span> ApiResponse.succeed(bigDecimal);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure></article><div class="post-copyright"><div class="copyright-cc-box"><i class="anzhiyufont anzhiyu-icon-copyright"></i></div><div class="post-copyright__author_box"><a class="post-copyright__author_img" href="/" title="头像"><img class="post-copyright__author_img_back" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" onerror="this.onerror=null,this.src="https://up.ctext.top/default_bg.png"" data-lazy-src="https://up.ctext.top/avatar.png" title="头像" alt="头像"><img class="post-copyright__author_img_front" src= "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" 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class="author-info__bottom-group"><a class="author-info__bottom-group-left" href="/"><h1 class="author-info__name">伴随</h1><div class="author-info__desc">请保持那份热爱 奔赴下一场山海</div></a><div class="card-info-social-icons is-center"><a class="social-icon faa-parent animated-hover" href="https://qm.qq.com/q/1sv8urqpRS" target="_blank" title="QQ"><i class="anzhiyufont anzhiyu-icon-qq"></i></a></div></div></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="anzhiyufont anzhiyu-icon-bullhorn anzhiyu-shake"></i><span>公告</span></div><div class="announcement_content"><div id="welcome-info"></div></div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="anzhiyufont anzhiyu-icon-bars"></i><span>文章目录</span><span class="toc-percentage"></span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link"><span class="toc-number">1.</span> <span class="toc-text">java表达式解析器（支持自定义函数以及操作符）</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E8%AF%B4%E6%98%8E"><span class="toc-number">1.1.</span> <span class="toc-text">说明</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%89%A7%E8%A1%8C%E9%80%BB%E8%BE%91"><span class="toc-number">1.1.1.</span> <span class="toc-text">执行逻辑</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E4%BC%98%E5%8C%96"><span class="toc-number">1.1.2.</span> <span class="toc-text">优化</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F"><span class="toc-number">1.2.</span> <span class="toc-text">注意</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#1-%E5%BC%95%E5%85%A5%E4%BE%9D%E8%B5%96"><span class="toc-number">1.3.</span> <span class="toc-text">1.引入依赖</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-%E5%85%B3%E4%BA%8E%E8%87%AA%E5%AE%9A%E4%B9%89%E5%87%BD%E6%95%B0%E4%BB%8B%E7%BB%8D"><span class="toc-number">1.4.</span> <span class="toc-text">2.关于自定义函数介绍</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E9%87%8D%E5%86%99%E8%87%AA%E5%AE%9A%E4%B9%89%E5%87%BD%E6%95%B0%E7%88%B6%E7%B1%BB"><span class="toc-number">1.4.1.</span> <span class="toc-text">重写自定义函数父类</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%87%AA%E5%AE%9A%E4%B9%89%E5%87%BD%E6%95%B0%E7%A4%BA%E4%BE%8B"><span class="toc-number">1.4.2.</span> <span class="toc-text">自定义函数示例</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#3-%E5%85%B3%E4%BA%8E%E8%87%AA%E5%AE%9A%E4%B9%89%E6%93%8D%E4%BD%9C%E7%AC%A6%E7%9A%84%E4%BB%8B%E7%BB%8D"><span class="toc-number">1.5.</span> <span class="toc-text">3.关于自定义操作符的介绍</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%87%AA%E5%AE%9A%E4%B9%89%E6%93%8D%E4%BD%9C%E7%AC%A6%E6%9E%84%E9%80%A0%E6%96%B9%E6%B3%95%E5%8F%82%E6%95%B0%E4%BB%8B%E7%BB%8D"><span class="toc-number">1.5.1.</span> <span class="toc-text">自定义操作符构造方法参数介绍</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E9%BB%98%E8%AE%A4%E7%9A%84%E7%AC%A6%E5%8F%B7%E4%BC%98%E5%85%88%E7%BA%A7"><span class="toc-number">1.5.2.</span> <span class="toc-text">默认的符号优先级</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%87%AA%E5%AE%9A%E4%B9%89%E6%93%8D%E4%BD%9C%E7%AC%A6%E7%A4%BA%E4%BE%8B"><span class="toc-number">1.5.3.</span> <span class="toc-text">自定义操作符示例</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#4-%E5%B7%A5%E5%85%B7%E7%B1%BB"><span class="toc-number">1.6.</span> <span class="toc-text">4.工具类</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%96%B9%E6%B3%95%E4%BB%8B%E7%BB%8D"><span 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const footer = document.getElementById("footer");
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img.src = "https://up.ctext.top/happy.svg";
img.title = "下班了就该开开心心的玩耍，嘿嘿~";
img.alt = "下班了就该开开心心的玩耍，嘿嘿~";
}
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const locale = {
nick: '你的专属昵称',
nickError: '昵称太短啦！至少得有3个字符才能算数哦！',
mail: '你的电子小信箱',
mailError: '哎呀，这不是一个合格的邮箱地址哦，请再检查一遍！',
link: '你有个酷酷的网址吗？',
optional: '这个嘛，想填就填，不填也行！',
placeholder: '吐槽一下？',
sofa: '来，坐沙发上，发表你的评论吧！',
submit: '一键发送，让世界听到你的声音！',
like: '点个赞，让TA知道你的心意！',
cancelLike: '哎呀，不小心点错了，取消赞！',
reply: '回复TA，开启一场对话吧！',
cancelReply: '等等，我话还没说完，取消回复！',
comment: '来，说说你的看法，让评论区热闹起来！',
refresh: '刷新一下，看看有啥新动态！',
more: '哇塞，还有更多精彩内容等你来加载！',
preview: '先睹为快，预览一下你的大作吧！',
emoji: '来，加点表情，让你的评论更生动！',
uploadImage: '上传你的美照，让大家一起欣赏！',
seconds: '刚刚才发的，新鲜出炉！',
minutes: '几分钟前，还热乎着呢！',
hours: '几小时前，热度还在哦！',
days: '几天前，但依旧值得一看！',
now: '哇塞，刚刚发的，快抢沙发！',
uploading: '稍等片刻，你的图片正在飞奔而来！',
login: '登录一下，解锁更多功能！',
logout: '拜拜了您嘞，下次再见！',
admin: '博主大人在此，谁敢造次！',
sticky: '置顶一下，让更多人看到你的精彩内容！',
word: '字',
wordHint: '评论字数要在0到1字之间哦！\n现在你已经写了$2个字了，加油！',
anonymous: '神秘人出没，猜猜是谁？',
level0: '潜水员，深藏不露！',
level1: '冒泡小能手，偶尔露个头！',
level2: '吐槽大师，一针见血！',
level3: '活跃分子，无处不在！',
level4: '话痨达人，说个不停！',
level5: '传说级大神，膜拜一下！',
gif: '动态表情包，让你的评论更有趣！',
gifSearchPlaceholder: '快来搜索你喜欢的表情包，让评论更生动！',
profile: '看看我的个人资料，了解一下我吧！',
approved: '审核通过，可以展示啦！',
waiting: '正在等待审核，别急哦！',
spam: '垃圾内容，走开走开！',
unsticky: '换个位置看看！',
oldest: '看看最早的评论！',
latest: '看看最新的动态！',
hottest: '看看哪条评论最火！',
reactionTitle: '快来对这篇文章发表你的看法吧，让博主知道你的想法！😜'
};
let initFn = window.walineFn || null
const initWaline = (Fn) => {
const waline = Fn(Object.assign({
el: '#waline-wrap',
serverURL: 'https://bc.ctext.top/',
pageview: false,
dark: 'html[data-theme="dark"]',
path: window.location.pathname,
comment: false,
imageUploader: true,
comment: false,
copyright: false,
reaction: true,
locale
}, null))
const destroyWaline = () => {
waline.destroy()
}
anzhiyu.addGlobalFn('pjax', destroyWaline, 'destroyWaline')
}
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if (initFn) initWaline(initFn)
else {
await getCSS('https://cdn.cbd.int/@waline/client@3.1.3/dist/waline.css')
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initFn = init || Waline.init
initWaline(initFn)
window.walineFn = initFn
}
}
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if (true) anzhiyu.loadComment(document.getElementById('waline-wrap'),loadWaline)
else setTimeout(loadWaline, 0)
} else {
window.loadOtherComment = loadWaline
}
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if (content === '') return content
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content = content.replace(/<pre><code>.*?<\/pre>/gi, '[代码]') // replace code
content = content.replace(/<[^>]+>/g,"") // remove html tag
if (content.length > 150) {
content = content.substring(0,150) + '...'
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return content
}
const generateHtml = array => {
let result = ''
if (array.length) {
for (let i = 0; i < array.length; i++) {
result += '<div class=\'aside-list-item\'>'
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const name = 'data-lazy-src'
result += `<a href='${array[i].url}' class='thumbnail'><img ${name}='${array[i].avatar}' alt='${array[i].nick}'></a>`
}
result += `<div class='content'>
<a class='comment' href='${array[i].url}' title='${array[i].content}'>${array[i].content}</a>
<div class='name'><span>${array[i].nick} / </span><time datetime="${array[i].date}">${anzhiyu.diffDate(array[i].date, true)}</time></div>
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}
} else {
result += '没有评论'
}
let $dom = document.querySelector('#card-newest-comments .aside-list')
$dom && ($dom.innerHTML= result)
window.lazyLoadInstance && window.lazyLoadInstance.update()
window.pjax && window.pjax.refresh($dom)
}
const getComment = async () => {
try {
const res = await fetch('https://bc.ctext.top/api/comment?type=recent&count=6', { method: 'GET' })
const result = await res.json()
const walineArray = result.data.map(e => {
return {
'content': changeContent(e.comment),
'avatar': e.avatar,
'nick': e.nick,
'url': e.url + '#' + e.objectId,
'date': e.time || e.insertedAt
}
})
saveToLocal.set('waline-newest-comments', JSON.stringify(walineArray), 10/(60*24))
generateHtml(walineArray)
} catch (err) {
console.error(err)
const $dom = document.querySelector('#card-newest-comments .aside-list')
$dom.textContent= "无法获取评论，请确认相关配置是否正确"
}
}
const newestCommentInit = () => {
if (document.querySelector('#card-newest-comments .aside-list')) {
const data = saveToLocal.get('waline-newest-comments')
if (data) {
generateHtml(JSON.parse(data))
} else {
getComment()
}
}
}
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