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content="/images/avatar.jpg"><meta itemprop="name" content="Hito Li"><meta itemprop="description" content="天下事有难易乎？为之，则难者亦易矣, 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。</p><figure class="highlight java"><figcaption data-lang="java"></figcaption><table><tr><td data-num="1"></td><td><pre><span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token class-name">String</span> <span class="token function">toJSONString</span><span class="token punctuation">(</span><span class="token class-name">Object</span> object<span class="token punctuation">)</span> <span class="token punctuation">{</span></pre></td></tr><tr><td data-num="2"></td><td><pre> <span class="token class-name">SerializerFeature</span><span class="token punctuation">[</span><span class="token punctuation">]</span> serializerFeatures <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SerializerFeature</span><span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token punctuation">{</span></pre></td></tr><tr><td data-num="3"></td><td><pre> <span class="token comment">// 格式化时间</span></pre></td></tr><tr><td data-num="4"></td><td><pre> <span class="token class-name">SerializerFeature<span class="token punctuation">.</span>WriteDateUseDateFormat</span></pre></td></tr><tr><td data-num="5"></td><td><pre> <span class="token punctuation">}</span><span class="token punctuation">;</span></pre></td></tr><tr><td data-num="6"></td><td><pre> <span class="token keyword">return</span> <span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">toJSONString</span><span class="token punctuation">(</span>object<span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">ValueFilter</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span></pre></td></tr><tr><td data-num="7"></td><td><pre> <span class="token annotation punctuation">@Override</span></pre></td></tr><tr><td data-num="8"></td><td><pre> <span class="token keyword">public</span> <span class="token class-name">Object</span> <span class="token function">process</span><span class="token punctuation">(</span><span class="token class-name">Object</span> object<span class="token punctuation">,</span> <span class="token class-name">String</span> name<span class="token punctuation">,</span> <span class="token class-name">Object</span> value<span class="token punctuation">)</span> <span class="token punctuation">{</span></pre></td></tr><tr><td data-num="9"></td><td><pre> <span class="token comment">// 如果名称或者值为 null 或空字符串，则不序列化该属性</span></pre></td></tr><tr><td data-num="10"></td><td><pre> <span class="token keyword">if</span> <span class="token punctuation">(</span>name <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">||</span> <span class="token punctuation">(</span>name <span class="token keyword">instanceof</span> <span class="token class-name">String</span> <span class="token operator">&&</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">)</span> name<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">||</span></pre></td></tr><tr><td data-num="11"></td><td><pre> value <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">||</span> <span class="token punctuation">(</span>value <span class="token keyword">instanceof</span> <span class="token class-name">String</span> <span class="token operator">&&</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">)</span> value<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span></pre></td></tr><tr><td data-num="12"></td><td><pre> <span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span></pre></td></tr><tr><td data-num="13"></td><td><pre> <span class="token punctuation">}</span></pre></td></tr><tr><td data-num="14"></td><td><pre> <span class="token keyword">return</span> value<span class="token punctuation">;</span></pre></td></tr><tr><td data-num="15"></td><td><pre> <span class="token punctuation">}</span></pre></td></tr><tr><td data-num="16"></td><td><pre> <span class="token punctuation">}</span><span class="token punctuation">,</span> serializerFeatures<span class="token punctuation">)</span><span class="token punctuation">;</span></pre></td></tr><tr><td data-num="17"></td><td><pre> <span class="token punctuation">}</span></pre></td></tr></table></figure><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" datetime="2023-12-02T21:59:33+08:00">2023-12-02</time> </span><span 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