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<span data-v-59e6cb88>2015 - </span>
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</a></span></div></div> <div data-v-7dd95ae2><div data-v-7dd95ae2><main class="page"><section style="display:;"><div class="page-title"><h1 class="title">jackson序列化和反序列化</h1> <div data-v-8a445198><i class="iconfont reco-account" data-v-8a445198><span data-v-8a445198>apan</span></i> <i class="iconfont reco-date" data-v-8a445198><span data-v-8a445198>10/6/2024</span></i> <i class="iconfont reco-eye" data-v-8a445198><span id="/jackson.html" data-flag-title="Your Article Title" class="leancloud-visitors" data-v-8a445198><a class="leancloud-visitors-count" style="font-size:.9rem;font-weight:normal;color:#999;"></a></span></i> <i class="tags iconfont reco-tag" data-v-8a445198><span class="tag-item" data-v-8a445198>jackson</span><span class="tag-item" data-v-8a445198>序列化</span></i></div></div> <div class="theme-reco-content content__default"><h2 id="序列化"><a href="#序列化" class="header-anchor">#</a> 序列化</h2> <h2 id="springboot"><a href="#springboot" class="header-anchor">#</a> springboot</h2> <p>Spring Boot默认使用Jackson作为其JSON处理库。当你使用<code>@RestController</code>或<code>@ResponseBody</code>注解时,Spring Boot会自动使用Jackson来序列化返回的对象。同样,当接收JSON请求体时,也会使用Jackson进行反序列化。</p> <h2 id="get、set方法"><a href="#get、set方法" class="header-anchor">#</a> get、set方法</h2> <h3 id="lombok生成"><a href="#lombok生成" class="header-anchor">#</a> lombok生成</h3> <p>属性首字母大写，拼接get/set
属性类型为boolean时特别，get方法为is拼接属性首字母大写</p> <h3 id="idea生成"><a href="#idea生成" class="header-anchor">#</a> idea生成</h3> <h2 id="jackson规则"><a href="#jackson规则" class="header-anchor">#</a> jackson规则</h2> <p>懒加载+缓存策略</p> <ol><li>通过反射获取属性</li> <li>获取get、set方法，与属性名匹配</li> <li>移除不可见属性(非public的，ignore注解等)</li></ol> <p>Jackson的核心逻辑在<code>POJOPropertiesCollector</code>类中:
com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">/**
* Internal method that will collect actual property information.
*
* @since 2.6
*/</span>
<span class="token keyword">protected</span> <span class="token keyword">void</span> <span class="token function">collectAll</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token class-name">LinkedHashMap</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">POJOPropertyBuilder</span><span class="token punctuation">></span></span> props <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LinkedHashMap</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">POJOPropertyBuilder</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// First: gather basic data</span>
<span class="token keyword">final</span> <span class="token keyword">boolean</span> isRecord <span class="token operator">=</span> <span class="token function">isRecordType</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 15-Jan-2023, tatu: [databind#3736] Let's avoid detecting fields of Records</span>
<span class="token comment">// altogether (unless we find a good reason to detect them)</span>
<span class="token comment">// 17-Apr-2023: Need Records' fields for serialization for cases like [databind#3895] & [databind#3628]</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>isRecord <span class="token operator">||</span> _forSerialization<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">_addFields</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// note: populates _fieldRenameMappings</span>
<span class="token punctuation">}</span>
<span class="token function">_addMethods</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 25-Jan-2016, tatu: Avoid introspecting (constructor-)creators for non-static</span>
<span class="token comment">// inner classes, see [databind#1502]</span>
<span class="token comment">// 13-May-2023, PJ: Need to avoid adding creators for Records when serializing [databind#3925]</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>_classDef<span class="token punctuation">.</span><span class="token function">isNonStaticInnerClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&&</span> <span class="token operator">!</span><span class="token punctuation">(</span>_forSerialization <span class="token operator">&&</span> isRecord<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">_addCreators</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// Remove ignored properties, first; this MUST precede annotation merging</span>
<span class="token comment">// since logic relies on knowing exactly which accessor has which annotation</span>
<span class="token function">_removeUnwantedProperties</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// and then remove unneeded accessors (wrt read-only, read-write)</span>
<span class="token function">_removeUnwantedAccessor</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Rename remaining properties</span>
<span class="token function">_renameProperties</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// and now add injectables, but taking care to avoid overlapping ones</span>
<span class="token comment">// via creator and regular properties</span>
<span class="token function">_addInjectables</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// then merge annotations, to simplify further processing</span>
<span class="token comment">// 26-Sep-2017, tatu: Before 2.9.2 was done earlier but that prevented some of</span>
<span class="token comment">// annotations from getting properly merged</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">POJOPropertyBuilder</span> property <span class="token operator">:</span> props<span class="token punctuation">.</span><span class="token function">values</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
property<span class="token punctuation">.</span><span class="token function">mergeAnnotations</span><span class="token punctuation">(</span>_forSerialization<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// And use custom naming strategy, if applicable...</span>
<span class="token comment">// 18-Jan-2021, tatu: To be done before trimming, to resolve</span>
<span class="token comment">// [databind#3368]</span>
<span class="token class-name">PropertyNamingStrategy</span> naming <span class="token operator">=</span> <span class="token function">_findNamingStrategy</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>naming <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">_renameUsing</span><span class="token punctuation">(</span>props<span class="token punctuation">,</span> naming<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// Sort by visibility (explicit over implicit); drop all but first of member</span>
<span class="token comment">// type (getter, setter etc) if there is visibility difference</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">POJOPropertyBuilder</span> property <span class="token operator">:</span> props<span class="token punctuation">.</span><span class="token function">values</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
property<span class="token punctuation">.</span><span class="token function">trimByVisibility</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// and, if required, apply wrapper name: note, MUST be done after</span>
<span class="token comment">// annotations are merged.</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>_config<span class="token punctuation">.</span><span class="token function">isEnabled</span><span class="token punctuation">(</span><span class="token class-name">MapperFeature</span><span class="token punctuation">.</span><span class="token constant">USE_WRAPPER_NAME_AS_PROPERTY_NAME</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">_renameWithWrappers</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// well, almost last: there's still ordering...</span>
<span class="token function">_sortProperties</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
_properties <span class="token operator">=</span> props<span class="token punctuation">;</span>
_collected <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br></div></div><p>属性名推断规则
Jackson会根据getter方法名推断属性名:
移除get，首字母改为小写，之后持续到首个小写字母
getPid => pid
getIPhone => iphone</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code> <span class="token comment">/**
* Method called to figure out name of the property, given
* corresponding suggested name based on a method or field name.
*
* @param basename Name of accessor/mutator method, not including prefix
* ("get"/"is"/"set")
*/</span>
<span class="token keyword">protected</span> <span class="token class-name">String</span> <span class="token function">legacyManglePropertyName</span><span class="token punctuation">(</span><span class="token keyword">final</span> <span class="token class-name">String</span> basename<span class="token punctuation">,</span> <span class="token keyword">final</span> <span class="token keyword">int</span> offset<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">final</span> <span class="token keyword">int</span> end <span class="token operator">=</span> basename<span class="token punctuation">.</span><span class="token function">length</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>end <span class="token operator">==</span> offset<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">// empty name, nope</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">char</span> c <span class="token operator">=</span> basename<span class="token punctuation">.</span><span class="token function">charAt</span><span class="token punctuation">(</span>offset<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 12-Oct-2020, tatu: Additional configurability; allow checking that</span>
<span class="token comment">// base name is acceptable (currently just by checking first character)</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>_baseNameValidator <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>_baseNameValidator<span class="token punctuation">.</span><span class="token function">accept</span><span class="token punctuation">(</span>c<span class="token punctuation">,</span> basename<span class="token punctuation">,</span> offset<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token comment">// next check: is the first character upper case? If not, return as is</span>
<span class="token keyword">char</span> d <span class="token operator">=</span> <span class="token class-name">Character</span><span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>c <span class="token operator">==</span> d<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> basename<span class="token punctuation">.</span><span class="token function">substring</span><span class="token punctuation">(</span>offset<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// otherwise, lower case initial chars. Common case first, just one char</span>
<span class="token class-name">StringBuilder</span> sb <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StringBuilder</span><span class="token punctuation">(</span>end <span class="token operator">-</span> offset<span class="token punctuation">)</span><span class="token punctuation">;</span>
sb<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>d<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> i <span class="token operator">=</span> offset<span class="token operator">+</span><span class="token number">1</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token punctuation">;</span> i <span class="token operator"><</span> end<span class="token punctuation">;</span> <span class="token operator">++</span>i<span class="token punctuation">)</span> <span class="token punctuation">{</span>
c <span class="token operator">=</span> basename<span class="token punctuation">.</span><span class="token function">charAt</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span><span class="token punctuation">;</span>
d <span class="token operator">=</span> <span class="token class-name">Character</span><span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>c <span class="token operator">==</span> d<span class="token punctuation">)</span> <span class="token punctuation">{</span>
sb<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>basename<span class="token punctuation">,</span> i<span class="token punctuation">,</span> end<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
sb<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>d<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> sb<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br></div></div><div class="language-java line-numbers-mode"><pre class="language-java"><code> <span class="token keyword">do</span> <span class="token punctuation">{</span>
p<span class="token punctuation">.</span><span class="token function">nextToken</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">SettableBeanProperty</span> prop <span class="token operator">=</span> _beanProperties<span class="token punctuation">.</span><span class="token function">find</span><span class="token punctuation">(</span>propName<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>prop <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">// normal case</span>
<span class="token keyword">try</span> <span class="token punctuation">{</span>
prop<span class="token punctuation">.</span><span class="token function">deserializeAndSet</span><span class="token punctuation">(</span>p<span class="token punctuation">,</span> ctxt<span class="token punctuation">,</span> bean<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">wrapAndThrow</span><span class="token punctuation">(</span>e<span class="token punctuation">,</span> bean<span class="token punctuation">,</span> propName<span class="token punctuation">,</span> ctxt<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">continue</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">handleUnknownVanilla</span><span class="token punctuation">(</span>p<span class="token punctuation">,</span> ctxt<span class="token punctuation">,</span> bean<span class="token punctuation">,</span> propName<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>propName <span class="token operator">=</span> p<span class="token punctuation">.</span><span class="token function">nextFieldName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br></div></div><h3 id="总结"><a href="#总结" class="header-anchor">#</a> 总结</h3> <h2 id="常见问题"><a href="#常见问题" class="header-anchor">#</a> 常见问题</h2> <h3 id="属性为null-不序列化"><a href="#属性为null-不序列化" class="header-anchor">#</a> 属性为null，不序列化</h3> <h3 id="生成的json有多余字段"><a href="#生成的json有多余字段" class="header-anchor">#</a> 生成的json有多余字段</h3> <h2 id="最佳实践"><a href="#最佳实践" class="header-anchor">#</a> 最佳实践</h2> <p>为避免潜在问题,建议使用<code>@JsonProperty</code>注解明确指定属性名:</p></div></section> <footer class="page-edit"><!----> <!----></footer> <!----> <div class="comments-wrapper"><!----></div></main></div> <!----></div> <ul class="sub-sidebar sub-sidebar-wrapper" style="width:12rem;" data-v-b57cc07c data-v-7dd95ae2><li class="level-2" data-v-b57cc07c><a href="/jackson.html#序列化" class="sidebar-link reco-side-序列化" data-v-b57cc07c>序列化</a></li><li class="level-2" data-v-b57cc07c><a href="/jackson.html#springboot" class="sidebar-link reco-side-springboot" data-v-b57cc07c>springboot</a></li><li class="level-2" data-v-b57cc07c><a href="/jackson.html#get、set方法" class="sidebar-link reco-side-get、set方法" data-v-b57cc07c>get、set方法</a></li><li class="level-3" data-v-b57cc07c><a href="/jackson.html#lombok生成" class="sidebar-link reco-side-lombok生成" data-v-b57cc07c>lombok生成</a></li><li class="level-3" data-v-b57cc07c><a href="/jackson.html#idea生成" class="sidebar-link reco-side-idea生成" data-v-b57cc07c>idea生成</a></li><li class="level-2" data-v-b57cc07c><a href="/jackson.html#jackson规则" class="sidebar-link reco-side-jackson规则" data-v-b57cc07c>jackson规则</a></li><li class="level-3" data-v-b57cc07c><a href="/jackson.html#总结" class="sidebar-link reco-side-总结" data-v-b57cc07c>总结</a></li><li class="level-2" data-v-b57cc07c><a href="/jackson.html#常见问题" class="sidebar-link reco-side-常见问题" data-v-b57cc07c>常见问题</a></li><li class="level-3" data-v-b57cc07c><a href="/jackson.html#属性为null-不序列化" class="sidebar-link reco-side-属性为null-不序列化" data-v-b57cc07c>属性为null，不序列化</a></li><li class="level-3" data-v-b57cc07c><a href="/jackson.html#生成的json有多余字段" class="sidebar-link reco-side-生成的json有多余字段" data-v-b57cc07c>生成的json有多余字段</a></li><li class="level-2" data-v-b57cc07c><a href="/jackson.html#最佳实践" class="sidebar-link reco-side-最佳实践" data-v-b57cc07c>最佳实践</a></li></ul></div></div></div><div class="global-ui"><div class="back-to-ceiling" style="right:1rem;bottom:6rem;width:2.5rem;height:2.5rem;border-radius:.25rem;line-height:2.5rem;display:none;" data-v-c6073ba8 data-v-c6073ba8><svg t="1574745035067" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="5404" class="icon" data-v-c6073ba8><path d="M526.60727968 10.90185116a27.675 27.675 0 0 0-29.21455937 0c-131.36607665 82.28402758-218.69155461 228.01873535-218.69155402 394.07834331a462.20625001 462.20625001 0 0 0 5.36959153 69.94390903c1.00431239 6.55289093-0.34802892 13.13561351-3.76865779 18.80351572-32.63518765 54.11355614-51.75690182 118.55860487-51.7569018 187.94566865a371.06718723 371.06718723 0 0 0 11.50484808 91.98906777c6.53300375 25.50556257 41.68394495 28.14064038 52.69160883 4.22606766 17.37162448-37.73630017 42.14135425-72.50938081 72.80769204-103.21549295 2.18761121 3.04276886 4.15646224 6.24463696 6.40373557 9.22774369a1871.4375 1871.4375 0 0 0 140.04691725 5.34970492 1866.36093723 1866.36093723 0 0 0 140.04691723-5.34970492c2.24727335-2.98310674 4.21612437-6.18497483 6.3937923-9.2178004 30.66633723 30.70611158 55.4360664 65.4791928 72.80769147 103.21549355 11.00766384 23.91457269 46.15860503 21.27949489 52.69160879-4.22606768a371.15156223 371.15156223 0 0 0 11.514792-91.99901164c0-69.36717486-19.13165746-133.82216804-51.75690182-187.92578088-3.42062944-5.66790279-4.76302748-12.26056868-3.76865837-18.80351632a462.20625001 462.20625001 0 0 0 5.36959269-69.943909c-0.00994388-166.08943902-87.32547796-311.81420293-218.6915546-394.09823051zM605.93803103 357.87693858a93.93749974 93.93749974 0 1 1-187.89594924 6.1e-7 93.93749974 93.93749974 0 0 1 187.89594924-6.1e-7z" p-id="5405" data-v-c6073ba8></path><path d="M429.50777625 765.63860547C429.50777625 803.39355007 466.44236686 1000.39046097 512.00932183 1000.39046097c45.56695499 0 82.4922232-197.00623328 82.5015456-234.7518555 0-37.75494459-36.9345906-68.35043303-82.4922232-68.34111062-45.57627738-0.00932239-82.52019037 30.59548842-82.51086798 68.34111062z" p-id="5406" data-v-c6073ba8></path></svg></div><!----></div></div>
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