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天生我材必有用"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="涛声依旧"></span><div class="body md" itemprop="articleBody"><p>今天在把对象转为 json 时需要去除 key 或者 value 为 null 或空字符串的属性，特此记录一下后续好复用。<br></p><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">static</span> String <span class="title function_">toJSONString</span><span class="params">(Object object)</span> {</span><br><span class="line"> SerializerFeature[] serializerFeatures = <span class="keyword">new</span> <span class="title class_">SerializerFeature</span>[] {</span><br><span class="line"> <span class="comment">//格式化时间</span></span><br><span class="line"> SerializerFeature.WriteDateUseDateFormat</span><br><span class="line"> };</span><br><span class="line"> <span class="keyword">return</span> JSON.toJSONString(object, <span class="keyword">new</span> <span class="title class_">ValueFilter</span>() {</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="keyword">public</span> Object <span class="title function_">process</span><span class="params">(Object object, String name, Object value)</span> {</span><br><span class="line"> <span class="comment">// 如果名称或者值为null或空字符串，则不序列化该属性</span></span><br><span class="line"> <span class="keyword">if</span> (name == <span class="literal">null</span> || (name <span class="keyword">instanceof</span> String && ((String) name).isEmpty()) ||</span><br><span class="line"> value == <span class="literal">null</span> || (value <span class="keyword">instanceof</span> String && ((String) value).isEmpty())) {</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 class="keyword">return</span> value;</span><br><span class="line"> }</span><br><span class="line"> }, serializerFeatures);</span><br><span class="line"> }</span><br></pre></td></tr></table></figure><p></p><div class="tags"><a href="/tags/fastjson/" rel="tag"><i class="ic i-tag"></i> fastjson</a></div></div><footer><div class="meta"><span class="item"><span class="icon"><i class="ic i-calendar-check"></i> </span><span class="text">更新于</span> <time title="修改时间：2023-12-02 21:59:33" itemprop="dateModified" 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