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<article id="post-spring boot AOP" class="article article-type-post" itemscope itemprop="blogPost">
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<a class="article-title" href="/2016/12/07/spring boot AOP/">spring boot AOP</a>
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<div class="article-entry" itemprop="articleBody">
<p>spring boot 越用越方便了，今天说一下怎么用AOP。</p>
<h3 id="pom-xml"><a href="#pom-xml" class="headerlink" title="pom.xml"></a>pom.xml</h3><p>在pom文件中加入aop，spring boot 会帮你搞定一切配置<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="tag"><<span class="name">dependency</span>></span></div><div class="line"><span class="tag"><<span class="name">groupId</span>></span>org.springframework.boot<span class="tag"></<span class="name">groupId</span>></span></div><div class="line"><span class="tag"><<span class="name">artifactId</span>></span>spring-boot-starter-aop<span class="tag"></<span class="name">artifactId</span>></span></div><div class="line"><span class="tag"></<span class="name">dependency</span>></span></div></pre></td></tr></table></figure></p>
<h3 id="切面代码"><a href="#切面代码" class="headerlink" title="切面代码"></a>切面代码</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">package</span> com.kindo.aop;</div><div class="line"></div><div class="line"><span class="keyword">import</span> org.aspectj.lang.annotation.AfterReturning;</div><div class="line"><span class="keyword">import</span> org.aspectj.lang.annotation.Aspect;</div><div class="line"><span class="keyword">import</span> org.springframework.beans.factory.annotation.Autowired;</div><div class="line"><span class="keyword">import</span> org.springframework.stereotype.Component;</div><div class="line"></div><div class="line"><span class="keyword">import</span> com.kindo.bill.dao.BillMapper;</div><div class="line"><span class="keyword">import</span> com.kindo.bill.model.IllegalMoney;</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * <p></div><div class="line"> * Title: 医疗数据平台(单据审核信息管理)</div><div class="line"> * </p></div><div class="line"> * <p></div><div class="line"> * Description: AOP用于更新单据表的扣除金额。</div><div class="line"> * </p></div><div class="line"> * <p></div><div class="line"> * Copyright: Copyright (c) 2016</div><div class="line"> * </p></div><div class="line"> * <p></div><div class="line"> * Company: 金豆医疗数据[www.kindo.com.cn]</div><div class="line"> * </p></div><div class="line"> * </div><div class="line"> * <span class="doctag">@author</span> 张喻龙</div><div class="line"> * <span class="doctag">@version</span> 1.0</div><div class="line"> * </div><div class="line"> */</div><div class="line"><span class="meta">@Aspect</span></div><div class="line"><span class="meta">@Component</span></div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UpdateIllegalMoneyAop</span> </span>{</div><div class="line"></div><div class="line"> <span class="meta">@Autowired</span></div><div class="line"> <span class="keyword">private</span> BillMapper billMapper;</div><div class="line"></div><div class="line"> <span class="meta">@AfterReturning</span>(value = <span class="string">"execution(* com.kindo.bill.service.IllegalMoneyService.*UpdateBillAKC260(..)) && args(illegalMoney)"</span>, argNames = <span class="string">"illegalMoney"</span>)</div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">afterReturning</span><span class="params">(IllegalMoney illegalMoney)</span> <span class="keyword">throws</span> Throwable </span>{</div><div class="line"> String akb020 = illegalMoney.getAkb020();</div><div class="line"> String akc190 = illegalMoney.getAkc190();</div><div class="line"> String aae072 = illegalMoney.getAae072();</div><div class="line"> String flowState = illegalMoney.getFlowState();</div><div class="line"> billMapper.updateBillAKC260(akb020, akc190, aae072,flowState);</div><div class="line"></div><div class="line"> }</div><div class="line"></div><div class="line">}</div></pre></td></tr></table></figure>
<blockquote>
<p>@AfterReturning ： 切面匹配的方法成功执行并且无异常</p>
<p>execution(<em> com.kindo.bill.service.IllegalMoneyService.</em>UpdateBillAKC260(..)) && args(illegalMoney) : AOP表达式，该表达式的意思是：在com.kindo.bill.service.IllegalMoneyService下的方法名后缀为UpdateBillAKC260的被匹配，UpdateBillAKC260(..) 两个..意思是方法的参数个人和类型无限制。args(illegalMoney) 是方法接受的参数 </p>
</blockquote>
</div>
<div class="article-info article-info-index">
<a href="/2016/12/07/spring boot AOP/" class="archive-article-date">
<time datetime="2016-12-07T08:53:46.644Z" itemprop="datePublished"><i class="icon-clock"></i>2016-12-07</time>
</a>
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<i class="icon-price-tags"></i>
<ul class="article-tag-list"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/Spring-boot/">Spring boot</a></li><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/aop/">aop</a></li></ul>
</div>
<div class="clearfix"></div>
</div>
</div>
</article>
<article id="post-nginx开启压缩" class="article article-type-post" itemscope itemprop="blogPost">
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<a class="article-title" href="/2016/12/04/nginx开启压缩/">nginx 开启Gzip压缩</a>
</h1>
</header>
<div class="article-entry" itemprop="articleBody">
<p>最近发现前端的css和js加载很耗时，一个服务才33ms，静态文件加起来都几百毫秒了，于是开启nginx的压缩。</p>
<p>找到nginx.conf</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div></pre></td><td class="code"><pre><div class="line">gzip on;</div><div class="line"># 默认值: gzip off </div><div class="line"># 开启或者关闭gzip模块</div><div class="line"> </div><div class="line">gzip_comp_level 4;</div><div class="line"># 默认值：1(建议选择为4)</div><div class="line"># gzip压缩比/压缩级别，压缩级别 1-9，级别越高压缩率越大，当然压缩时间也就越长（传输快但比较消耗cpu）。</div><div class="line"> </div><div class="line">gzip_buffers 4 16k;</div><div class="line"># 默认值: gzip_buffers 4 4k/8k </div><div class="line"># 设置系统获取几个单位的缓存用于存储gzip的压缩结果数据流。 例如 4 4k 代表以4k为单位，按照原始数据大小以4k为单位的4倍申请内存。 4 8k 代表以8k为单位，按照原始数据大小以8k为单位的4倍申请内存。</div><div class="line"># 如果没有设置，默认值是申请跟原始数据相同大小的内存空间去存储gzip压缩结果。</div><div class="line"> </div><div class="line">gzip_types text/plain application/x-javascript text/css application/xml text/javascript application/x-httpd-php;</div><div class="line"># 默认值: gzip_types text/html (默认不对js/css文件进行压缩)</div><div class="line"># 压缩类型，匹配MIME类型进行压缩</div><div class="line"># 不能用通配符 text/*</div><div class="line"># (无论是否指定)text/html默认已经压缩 </div><div class="line"># 设置哪压缩种文本文件可参考 conf/mime.types</div><div class="line"> </div><div class="line">gzip_min_length 1k;</div><div class="line"># 默认值: 0 ，不管页面多大都压缩</div><div class="line"># 设置允许压缩的页面最小字节数，页面字节数从header头中的Content-Length中进行获取。</div><div class="line"># 建议设置成大于1k的字节数，小于1k可能会越压越大。 即: gzip_min_length 1024</div><div class="line"> </div><div class="line">gzip_vary on;</div><div class="line"># 和http头有关系，加个vary头，给代理服务器用的，有的浏览器支持压缩，有的不支持，所以避免浪费不支持的也压缩，所以根据客户端的HTTP头来判断，是否需要压缩</div><div class="line"> </div><div class="line">gzip_disable "MSIE [1-6].";</div><div class="line"># 禁用IE6的gzip压缩，又是因为杯具的IE6。当然，IE6目前依然广泛的存在，所以这里你也可以设置为“MSIE [1-5].”</div><div class="line"># IE6的某些版本对gzip的压缩支持很不好，会造成页面的假死，为了确保其它的IE6版本不出问题，所以建议加上gzip_disable的设置</div></pre></td></tr></table></figure>
</div>
<div class="article-info article-info-index">
<a href="/2016/12/04/nginx开启压缩/" class="archive-article-date">
<time datetime="2016-12-04T02:51:02.256Z" itemprop="datePublished"><i class="icon-clock"></i>2016-12-04</time>
</a>
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<i class="icon-price-tags"></i>
<ul class="article-tag-list"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/nginx/">nginx</a></li></ul>
</div>
<div class="clearfix"></div>
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</div>
</article>
<article id="post-oracle 表分区" class="article article-type-post" itemscope itemprop="blogPost">
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<a class="article-title" href="/2016/12/01/oracle 表分区/">oracle 表分区实战</a>
</h1>
</header>
<div class="article-entry" itemprop="articleBody">
<p>数据库中的某些业务表，会存放很多历史数据，导致查询效率很慢，想用分区进行优化。根据业务下面我会进行几个分区：</p>
<h3 id="范围分区"><a href="#范围分区" class="headerlink" title="范围分区"></a>范围分区</h3><figure class="highlight sql"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">CREATE</span> <span class="keyword">TABLE</span> 表</div><div class="line">（字段）</div><div class="line"><span class="keyword">PARTITION</span> <span class="keyword">BY</span> <span class="keyword">RANGE</span> (birthday) </div><div class="line"><span class="built_in">INTERVAL</span>(NUMTOYMINTERVAL(<span class="number">1</span>, <span class="string">'month'</span>)) </div><div class="line">(<span class="keyword">PARTITION</span> P0 <span class="keyword">VALUES</span> <span class="keyword">LESS</span> <span class="keyword">THAN</span> (<span class="keyword">TO_DATE</span>(<span class="string">'2016-1-1'</span>, <span class="string">'yyyy-mm-dd'</span>)));</div></pre></td></tr></table></figure>
<blockquote>
<p>创建一个表，自动根据birthday的月份来进行分区。每个月都是一个独立的分区。查询这个表一般会根据birthday的范围来做查询。</p>
</blockquote>
<p>现在我们在来创建索引，分区表有全局索引和本地索引之分，如果大家要创建位图索引，只能创建本地索引</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">create</span> <span class="keyword">bitmap</span> <span class="keyword">index</span> I_K_F_BILL_MACHINE_CHECK <span class="keyword">on</span> K_F_BILL(MACHINE_CHECK) <span class="keyword">local</span>;</div></pre></td></tr></table></figure>
<h3 id="哈希分区"><a href="#哈希分区" class="headerlink" title="哈希分区"></a>哈希分区</h3><blockquote>
<p>也被成为散列分区。<br>这类分区是在列值上使用哈希算法，以确定将行放入哪个分区中。当列的值没有合适的条件时，建议使用散哈希分区。<br>哈希分区为通过指定分区编号来均匀分布数据的一种分区类型，因为通过在I/O设备上进行散列分区，使得这些分区大小一致。<br>对于那些无法有效划分范围的表，可以使用hash分区，这样对于提高性能还是会有一定的帮助。hash分区会将表中的数据平均分配到你指定的几个分 区中，列所在分区是依据分区列的hash值自动分配，因此你并不能控制也不知道哪条记录会被放到哪个分区中，hash分区也可以支持多个依赖列。</p>
</blockquote>
<p>一个明细表，里面会根据医院编号，住院号、单据号来判断唯一性。查询这个明细表一定会带着这3个字段，所以这里根据医院编号来做哈希分区。</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line"> <span class="keyword">CREATE</span> <span class="keyword">TABLE</span> 表</div><div class="line"> (</div><div class="line"> <span class="keyword">ID</span> VARCHAR2(<span class="number">32</span>) <span class="keyword">not</span> <span class="literal">null</span>,</div><div class="line"> AKB020 VARCHAR2(<span class="number">8</span>) <span class="keyword">not</span> <span class="literal">null</span>,</div><div class="line"> AKC190 VARCHAR2(<span class="number">18</span>) <span class="keyword">not</span> <span class="literal">null</span>,</div><div class="line"> AKC220 VARCHAR2(<span class="number">20</span>) <span class="keyword">not</span> <span class="literal">null</span>,</div><div class="line"> AAE072 VARCHAR2(<span class="number">18</span>) <span class="keyword">not</span> <span class="literal">null</span>,</div><div class="line"> AKC221 <span class="built_in">DATE</span> <span class="keyword">not</span> <span class="literal">null</span>,</div><div class="line"> AKA063 VARCHAR2(<span class="number">3</span>)</div><div class="line">)</div><div class="line"> <span class="keyword">PARTITION</span> <span class="keyword">BY</span> <span class="keyword">HASH</span> (AKB020)</div><div class="line"> <span class="keyword">PARTITIONS</span> <span class="number">32</span></div></pre></td></tr></table></figure>
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<a href="/2016/12/01/oracle 表分区/" class="archive-article-date">
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<p>发现jenkins构建的时间无法删除自己发布的旧工程，导致构建失败。日志报 Failed to undeploy错误。</p>
<p>google了下，从2方面去解决。</p>
<p>第一个是看给的权限有没有缺少<br>第二个修改context.xml</p>
<h3 id="第一步、增加tomcat权限"><a href="#第一步、增加tomcat权限" class="headerlink" title="第一步、增加tomcat权限"></a>第一步、增加tomcat权限</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><user name=<span class="string">"admin"</span> password=<span class="string">"admin"</span> roles=<span class="string">"admin-gui,manager,manager-script,manager-jmx,manager-gui,manager-status"</span> /></div></pre></td></tr></table></figure>
<h3 id="第二步、修改context-xml-增加一句话"><a href="#第二步、修改context-xml-增加一句话" class="headerlink" title="第二步、修改context.xml 增加一句话"></a>第二步、修改context.xml 增加一句话</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><Context antiResourceLocking=<span class="string">"true"</span>></div></pre></td></tr></table></figure>
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<article id="post-spring boot增加拦截器" class="article article-type-post" itemscope itemprop="blogPost">
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<a class="article-title" href="/2016/11/30/spring boot增加拦截器/">spring boot 增加拦截器</a>
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<p>刚开始使用spring boot还是挺痛苦的，没有了各种XML反而不适应。。。这里给出如何注解添加一个拦截器</p>
<h3 id="第一步、继承WebMvcConfigurerAdapter"><a href="#第一步、继承WebMvcConfigurerAdapter" class="headerlink" title="第一步、继承WebMvcConfigurerAdapter"></a>第一步、继承WebMvcConfigurerAdapter</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">package</span> com.kindo.config;</div><div class="line"></div><div class="line"><span class="keyword">import</span> org.springframework.context.annotation.Configuration;</div><div class="line"><span class="keyword">import</span> org.springframework.web.servlet.config.annotation.InterceptorRegistry;</div><div class="line"><span class="keyword">import</span> org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;</div><div class="line"><span class="keyword">import</span> org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;</div><div class="line"></div><div class="line"><span class="keyword">import</span> com.kindo.Interceptor.AuthorizationInterceptor;</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * <span class="doctag">@author</span> 张喻龙</div><div class="line"> * <span class="doctag">@since</span> 2015-12-19 16:16</div><div class="line"> */</div><div class="line"><span class="meta">@Configuration</span></div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">WebMvcConfig</span> <span class="keyword">extends</span> <span class="title">WebMvcConfigurerAdapter</span> </span>{</div><div class="line"></div><div class="line"> <span class="comment">/**</span></div><div class="line"> * 指定一个路径，生成静态文件</div><div class="line"> */</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">addResourceHandlers</span><span class="params">(ResourceHandlerRegistry registry)</span> </span>{</div><div class="line"> registry.addResourceHandler(<span class="string">"/static/**"</span>).addResourceLocations(<span class="string">"classpath:/static/"</span>);</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="comment">/**</span></div><div class="line"> * 增加一个拦截器</div><div class="line"> * </div><div class="line"> * </div><div class="line"> * addPathPatterns 用于添加拦截规则 excludePathPatterns 用户排除拦截</div><div class="line"> */</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">addInterceptors</span><span class="params">(InterceptorRegistry registry)</span> </span>{</div><div class="line"> registry.addInterceptor(<span class="keyword">new</span> AuthorizationInterceptor()).addPathPatterns(<span class="string">"/**/api/**"</span>);</div><div class="line"> <span class="keyword">super</span>.addInterceptors(registry);</div><div class="line"> }</div><div class="line"></div><div class="line">}</div></pre></td></tr></table></figure>
<h3 id="第二步、拦截器代码"><a href="#第二步、拦截器代码" class="headerlink" title="第二步、拦截器代码"></a>第二步、拦截器代码</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">package</span> com.kindo.Interceptor;</div><div class="line"></div><div class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletRequest;</div><div class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletResponse;</div><div class="line"></div><div class="line"><span class="keyword">import</span> org.springframework.web.servlet.ModelAndView;</div><div class="line"><span class="keyword">import</span> org.springframework.web.servlet.handler.HandlerInterceptorAdapter;</div><div class="line"></div><div class="line"><span class="comment">/**</span></div><div class="line"> * 自定义拦截器</div><div class="line"> * </div><div class="line"> * <span class="doctag">@author</span> 张喻龙</div><div class="line"> *</div><div class="line"> */</div><div class="line"></div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">AuthorizationInterceptor</span> <span class="keyword">extends</span> <span class="title">HandlerInterceptorAdapter</span> </span>{</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">preHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler)</span></span></div><div class="line"> <span class="keyword">throws</span> Exception {</div><div class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">postHandle</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler,</span></span></div><div class="line"> ModelAndView modelAndView) <span class="keyword">throws</span> Exception {</div><div class="line"> System.out.println(<span class="string">"求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）"</span>);</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">afterCompletion</span><span class="params">(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)</span></span></div><div class="line"> <span class="keyword">throws</span> Exception {</div><div class="line"> System.out.println(<span class="string">"在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）"</span>);</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
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<a class="article-title" href="/2016/11/29/自定义jsckson null转换为字符串/">自定义jsckson null转换为字符串</a>
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<p>在使用spring boot中，默认配置使用jackson时，对象的null值也会被解析成null输出到前台，我们需要把null转换成空字符串</p>
<h3 id="第一步、自定义ObjectMapper"><a href="#第一步、自定义ObjectMapper" class="headerlink" title="第一步、自定义ObjectMapper"></a>第一步、自定义ObjectMapper</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">package</span> com.kindo.config;</div><div class="line"></div><div class="line"><span class="keyword">import</span> java.io.IOException;</div><div class="line"><span class="keyword">import</span> com.fasterxml.jackson.core.JsonGenerator;</div><div class="line"><span class="keyword">import</span> com.fasterxml.jackson.core.JsonProcessingException;</div><div class="line"><span class="keyword">import</span> com.fasterxml.jackson.databind.JsonSerializer;</div><div class="line"><span class="keyword">import</span> com.fasterxml.jackson.databind.ObjectMapper;</div><div class="line"><span class="keyword">import</span> com.fasterxml.jackson.databind.SerializerProvider;</div><div class="line"></div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">KindoObjectMapper</span> <span class="keyword">extends</span> <span class="title">ObjectMapper</span> </span>{</div><div class="line"></div><div class="line"> <span class="comment">/**</span></div><div class="line"> * </div><div class="line"> */</div><div class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">long</span> serialVersionUID = <span class="number">1L</span>;</div><div class="line"></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="title">KindoObjectMapper</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">super</span>();</div><div class="line"> <span class="comment">// 数字也加引号</span></div><div class="line"> <span class="comment">// this.configure(JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS, true);</span></div><div class="line"> <span class="comment">// this.configure(JsonGenerator.Feature.QUOTE_NON_NUMERIC_NUMBERS,</span></div><div class="line"> <span class="comment">// true);</span></div><div class="line"> <span class="comment">// 空值处理为空串</span></div><div class="line"> <span class="keyword">this</span>.getSerializerProvider().setNullValueSerializer(<span class="keyword">new</span> JsonSerializer<Object>() {</div><div class="line"> <span class="meta">@Override</span></div><div class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">serialize</span><span class="params">(Object value, JsonGenerator jg, SerializerProvider sp)</span></span></div><div class="line"> <span class="keyword">throws</span> IOException, JsonProcessingException {</div><div class="line"> jg.writeString(<span class="string">""</span>);</div><div class="line"> }</div><div class="line"> });</div><div class="line"></div><div class="line"> }</div><div class="line"></div><div class="line">}</div></pre></td></tr></table></figure>
<h3 id="第二步、修改SpringBoot启动类"><a href="#第二步、修改SpringBoot启动类" class="headerlink" title="第二步、修改SpringBoot启动类"></a>第二步、修改SpringBoot启动类</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line"><span class="comment">/**</span></div><div class="line"> * 自定义ObjectMapper</div><div class="line"> * </div><div class="line"> * <span class="doctag">@return</span></div><div class="line"> */</div><div class="line"><span class="meta">@Bean</span></div><div class="line"><span class="function"><span class="keyword">public</span> MappingJackson2HttpMessageConverter <span class="title">mappingJacksonHttpMessageConverter</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">final</span> MappingJackson2HttpMessageConverter converter = <span class="keyword">new</span> MappingJackson2HttpMessageConverter();</div><div class="line"> KindoObjectMapper mapper = <span class="keyword">new</span> KindoObjectMapper();</div><div class="line"> converter.setObjectMapper(mapper);</div><div class="line"> <span class="keyword">return</span> converter;</div><div class="line">}</div></pre></td></tr></table></figure>
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<section class="tools-section tools-section-friends">
<div class="friends-wrap" id="js-friends">
<a target="_blank" class="main-nav-link switch-friends-link" href="https://github.com/litten/hexo-theme-yilia">主题</a>
</div>
</section>
<section class="tools-section tools-section-me">
<div class="aboutme-wrap" id="js-aboutme">爱过！不约</div>
</section>
</div>
</div>
<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
<!-- Background of PhotoSwipe.
It's a separate element as animating opacity is faster than rgba(). -->
<div class="pswp__bg"></div>
<!-- Slides wrapper with overflow:hidden. -->
<div class="pswp__scroll-wrap">
<!-- Container that holds slides.
PhotoSwipe keeps only 3 of them in the DOM to save memory.
Don't modify these 3 pswp__item elements, data is added later on. -->
<div class="pswp__container">
<div class="pswp__item"></div>
<div class="pswp__item"></div>
<div class="pswp__item"></div>
</div>
<!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
<div class="pswp__ui pswp__ui--hidden">
<div class="pswp__top-bar">
<!-- Controls are self-explanatory. Order can be changed. -->
<div class="pswp__counter"></div>
<button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
<button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>
<button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
<button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
<!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
<!-- element will get class pswp__preloader--active when preloader is running -->
<div class="pswp__preloader">
<div class="pswp__preloader__icn">
<div class="pswp__preloader__cut">
<div class="pswp__preloader__donut"></div>
</div>
</div>
</div>
</div>
<div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
<div class="pswp__share-tooltip"></div>
</div>
<button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
</button>
<button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
</button>
<div class="pswp__caption">
<div class="pswp__caption__center"></div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>