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<!DOCTYPE html><html lang="zh-CN"><head><meta name="generator" content="Hexo 3.9.0"><meta http-equiv="content-type" content="text/html; charset=utf-8"><meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport"><meta content="yes" name="apple-mobile-web-app-capable"><meta content="black-translucent" name="apple-mobile-web-app-status-bar-style"><meta content="telephone=no" name="format-detection"><meta name="description" content><title>Spring RestTemplate的使用 | zhiheng's blog</title><link rel="stylesheet" type="text/css" href="/css/style.css?v=1.0.0"><link rel="stylesheet" type="text/css" href="//cdn.jsdelivr.net/npm/normalize.css/normalize.min.css"><link rel="stylesheet" type="text/css" href="//cdn.jsdelivr.net/npm/purecss/build/pure-min.min.css"><link rel="stylesheet" type="text/css" href="//cdn.jsdelivr.net/npm/purecss/build/grids-responsive-min.css"><link rel="stylesheet" href="//cdn.jsdelivr.net/npm/[email protected]/css/font-awesome.min.css"><script type="text/javascript" src="//cdn.jsdelivr.net/npm/jquery/dist/jquery.min.js"></script><link rel="icon" mask sizes="any" href="/img/favicon.ico"><link rel="Shortcut Icon" type="image/x-icon" href="/img/favicon.ico"><link rel="apple-touch-icon" href="/apple-touch-icon.png"><link rel="apple-touch-icon-precomposed" href="/apple-touch-icon.png"><link rel="alternate" type="application/atom+xml" href="/atom.xml"><script type="text/javascript" src="//cdn.jsdelivr.net/npm/clipboard/dist/clipboard.min.js"></script><script type="text/javascript" src="//cdn.jsdelivr.net/gh/codeseven/toastr/build/toastr.min.js"></script><link rel="stylesheet" href="//cdn.jsdelivr.net/gh/codeseven/toastr/build/toastr.min.css"></head><body><div class="body_container"><div id="header"><div class="site-name"><h1 class="hidden">Spring RestTemplate的使用</h1><a id="logo" href="/.">zhiheng's blog</a><p class="description">喜于分享，勤于积累；欢迎关注我的微信公众号：治恒说说</p></div><div id="nav-menu"><a class="current" href="/."><i class="fa fa-home"> 首页</i></a><a href="/archives/"><i class="fa fa-archive"> 归档</i></a><a href="/about/"><i class="fa fa-user"> 关于</i></a><a href="/demo/"><i class="fa fa-square"> 有趣的代码</i></a></div></div><div class="pure-g" id="layout"><div class="pure-u-1 pure-u-md-3-4"><div class="content_container"><div class="post"><h1 class="post-title">Spring RestTemplate的使用</h1><div class="post-meta">2021年11月11日<script src="https://busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js" async></script><span id="busuanzi_container_page_pv"> | <span id="busuanzi_value_page_pv"></span><span> 阅读</span></span></div><div class="post-content"><p>实际工作中我们经常会遇到利用 java 去访问其他接口获取数据，常用的有 JDK 原生的 HttpURLConnection 无需依赖其他包，提供了很多方法；另外 HttpClient 也是我们的不二选择，在 spring 之前，我们经常会用 HttpClient 来处理；还有一种方式就是利用 Socket，使用起来比较麻烦；用了 spring 之后，RestTemplate 则更加方便，更加灵活。</p>
<h2 id="一、概述"><a href="#一、概述" class="headerlink" title="一、概述"></a>一、概述</h2><p>spring框架提供的RestTemplate类可用于在应用中调用rest服务，它简化了与http服务的通信方式，统一了RESTful的标准，封装了http链接， 我们只需要传入url及返回值类型即可。相较于之前常用的HttpClient，RestTemplate是一种更优雅的调用RESTful服务的方式。</p>
<p>在Spring应用程序中访问第三方REST服务与使用Spring RestTemplate类有关。RestTemplate类的设计原则与许多其他Spring 模板类(例如JdbcTemplate、JmsTemplate)相同，为执行复杂任务提供了一种具有默认行为的简化方法。</p>
<p>RestTemplate默认依赖JDK提供http连接的能力（HttpURLConnection），如果有需要的话也可以通过setRequestFactory方法替换为例如 Apache HttpComponents、Netty或OkHttp等其它HTTP library。</p>
<p>考虑到RestTemplate类是为调用REST服务而设计的，因此它的主要方法与REST的基础紧密相连就不足为奇了，后者是HTTP协议的方法:HEAD、GET、POST、PUT、DELETE和OPTIONS。例如，RestTemplate类具有headForHeaders()、getForObject()、postForObject()、put()和delete()等方法。</p>
<h2 id="二、实现"><a href="#二、实现" class="headerlink" title="二、实现"></a>二、实现</h2><p>最新api地址：<br><a href="https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/client/RestTemplate.html" target="_blank" rel="noopener">https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/client/RestTemplate.html</a></p>
<p>RestTemplate包含以下几个部分：</p>
<p>HttpMessageConverter 对象转换器<br>ClientHttpRequestFactory 默认是JDK的HttpURLConnection<br>ResponseErrorHandler 异常处理<br>ClientHttpRequestInterceptor 请求拦截器</p>
<p>常规配置<br><figure class="highlight x86asm"><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></pre></td><td class="code"><pre><span class="line"><span class="meta">public</span> MyRestClientService(RestTemplateBuilder restTemplateBuilder) { </span><br><span class="line"> this<span class="number">.</span>restTemplate = restTemplateBuilder </span><br><span class="line"><span class="meta"> .basicAuthorization</span>(<span class="string">"username"</span>, <span class="string">"password"</span>) </span><br><span class="line"><span class="meta"> .setConnectTimeout</span>(<span class="number">3000</span>) </span><br><span class="line"><span class="meta"> .setReadTimeout</span>(<span class="number">5000</span>) </span><br><span class="line"><span class="meta"> .rootUri</span>(<span class="string">"http://api.example.com/"</span>) </span><br><span class="line"><span class="meta"> .build</span>()<span class="comment">; </span></span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>ClientHttpRequestInterceptor<br>学习使用带有Spring RestTemplate的ClientHttpRequestInterceptor，以Spring AOP风格记录请求和响应头和主体。</p>
<p>拦截器记录请求和响应<br><figure class="highlight arduino"><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> org.slf4j.Logger;<span class="keyword">import</span> org.slf4j.LoggerFactory;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.HttpRequest;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.client.ClientHttpRequestExecution;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.client.ClientHttpRequestInterceptor;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.client.ClientHttpResponse;</span><br><span class="line"><span class="keyword">import</span> org.springframework.util.StreamUtils;</span><br><span class="line"> </span><br><span class="line"><span class="keyword">import</span> java.io.IOException;</span><br><span class="line"><span class="keyword">import</span> java.nio.charset.Charset;</span><br><span class="line"> </span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">RequestResponseLoggingInterceptor</span> <span class="title">implements</span> <span class="title">ClientHttpRequestInterceptor</span> {</span></span><br><span class="line"> </span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> Logger <span class="built_in">log</span> = LoggerFactory.getLogger(<span class="keyword">this</span>.getClass());</span><br><span class="line"> </span><br><span class="line"> @Override</span><br><span class="line"> <span class="function"><span class="keyword">public</span> ClientHttpResponse <span class="title">intercept</span><span class="params">(HttpRequest request, <span class="keyword">byte</span>[] body, ClientHttpRequestExecution execution)</span> throws IOException</span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> logRequest(request, body);</span><br><span class="line"> ClientHttpResponse response = execution.execute(request, body);</span><br><span class="line"> logResponse(response);</span><br><span class="line"> </span><br><span class="line"> <span class="comment">//Add optional additional headers</span></span><br><span class="line"> response.getHeaders().add(<span class="string">"headerName"</span>, <span class="string">"VALUE"</span>);</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> response;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">logRequest</span><span class="params">(HttpRequest request, <span class="keyword">byte</span>[] body)</span> throws IOException</span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">if</span> (<span class="built_in">log</span>.isDebugEnabled())</span><br><span class="line"> {</span><br><span class="line"> <span class="built_in">log</span>.debug(<span class="string">"===========================request begin================================================"</span>);</span><br><span class="line"> <span class="built_in">log</span>.debug(<span class="string">"URI : {}"</span>, request.getURI());</span><br><span class="line"> <span class="built_in">log</span>.debug(<span class="string">"Method : {}"</span>, request.getMethod());</span><br><span class="line"> <span class="built_in">log</span>.debug(<span class="string">"Headers : {}"</span>, request.getHeaders());</span><br><span class="line"> <span class="built_in">log</span>.debug(<span class="string">"Request body: {}"</span>, <span class="keyword">new</span> <span class="keyword">String</span>(body, <span class="string">"UTF-8"</span>));</span><br><span class="line"> <span class="built_in">log</span>.debug(<span class="string">"==========================request end================================================"</span>);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">logResponse</span><span class="params">(ClientHttpResponse response)</span> throws IOException</span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">if</span> (<span class="built_in">log</span>.isDebugEnabled())</span><br><span class="line"> {</span><br><span class="line"> <span class="built_in">log</span>.debug(<span class="string">"============================response begin=========================================="</span>);</span><br><span class="line"> <span class="built_in">log</span>.debug(<span class="string">"Status code : {}"</span>, response.getStatusCode());</span><br><span class="line"> <span class="built_in">log</span>.debug(<span class="string">"Status text : {}"</span>, response.getStatusText());</span><br><span class="line"> <span class="built_in">log</span>.debug(<span class="string">"Headers : {}"</span>, response.getHeaders());</span><br><span class="line"> <span class="built_in">log</span>.debug(<span class="string">"Response body: {}"</span>, StreamUtils.copyToString(response.getBody(), Charset.defaultCharset()));</span><br><span class="line"> <span class="built_in">log</span>.debug(<span class="string">"=======================response end================================================="</span>);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>注册ClientHttpRequestInterceptor<br><figure class="highlight haxe"><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></pre></td><td class="code"><pre><span class="line">@Bean</span><br><span class="line"><span class="keyword">public</span> RestTemplate restTemplate(){</span><br><span class="line"> RestTemplate restTemplate = <span class="keyword">new</span> <span class="type">RestTemplate</span>();</span><br><span class="line"> </span><br><span class="line"> restTemplate.setRequestFactory(<span class="keyword">new</span><span class="type">BufferingClientHttpRequestFactory</span>(clientHttpRequestFactory()));</span><br><span class="line"> restTemplate.setMessageConverters(Collections.singletonList(mappingJacksonHttpMessageConverter()));</span><br><span class="line"> </span><br><span class="line"> restTemplate.setInterceptors( Collections.singletonList(<span class="keyword">new</span><span class="type">RequestResponseLoggingInterceptor</span>()) );</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> restTemplate;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h2 id="三、使用"><a href="#三、使用" class="headerlink" title="三、使用"></a>三、使用</h2><p>GET<br><figure class="highlight arduino"><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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">getEmployees</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">final</span> <span class="keyword">String</span> uri = <span class="string">"http://localhost:8080/springrestexample/employees"</span>;</span><br><span class="line"> </span><br><span class="line"> RestTemplate restTemplate = <span class="keyword">new</span> RestTemplate();</span><br><span class="line"> <span class="keyword">String</span> result = restTemplate.getForObject(uri, <span class="keyword">String</span>.class);</span><br><span class="line"> </span><br><span class="line"> System.out.<span class="built_in">println</span>(result);</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>使用RestTemplate定制HTTP头文件<br><figure class="highlight arduino"><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 class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">getEmployees</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">final</span> <span class="keyword">String</span> uri = <span class="string">"http://localhost:8080/springrestexample/employees"</span>;</span><br><span class="line"> </span><br><span class="line"> RestTemplate restTemplate = <span class="keyword">new</span> RestTemplate();</span><br><span class="line"> </span><br><span class="line"> HttpHeaders headers = <span class="keyword">new</span> HttpHeaders();</span><br><span class="line"> headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));</span><br><span class="line"> HttpEntity<<span class="keyword">String</span>> entity = <span class="keyword">new</span> HttpEntity<<span class="keyword">String</span>>(<span class="string">"parameters"</span>, headers);</span><br><span class="line"> </span><br><span class="line"> ResponseEntity<<span class="keyword">String</span>> result = restTemplate.exchange(uri, HttpMethod.GET, entity, <span class="keyword">String</span>.class);</span><br><span class="line"> </span><br><span class="line"> System.out.<span class="built_in">println</span>(result);</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>Get请求获取响应为一个对象<br><figure class="highlight arduino"><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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">getEmployees</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">final</span> <span class="keyword">String</span> uri = <span class="string">"http://localhost:8080/springrestexample/employees"</span>;</span><br><span class="line"> RestTemplate restTemplate = <span class="keyword">new</span> RestTemplate();</span><br><span class="line"> </span><br><span class="line"> EmployeeListVO result = restTemplate.getForObject(uri, EmployeeListVO.class);</span><br><span class="line"> </span><br><span class="line"> System.out.<span class="built_in">println</span>(result);</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>URL 参数<br><figure class="highlight arduino"><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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">getEmployeeById</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">final</span> <span class="keyword">String</span> uri = <span class="string">"http://localhost:8080/springrestexample/employees/{id}"</span>;</span><br><span class="line"> </span><br><span class="line"> Map<<span class="keyword">String</span>, <span class="keyword">String</span>> params = <span class="keyword">new</span> HashMap<<span class="keyword">String</span>, <span class="keyword">String</span>>();</span><br><span class="line"> params.<span class="built_in">put</span>(<span class="string">"id"</span>, <span class="string">"1"</span>);</span><br><span class="line"> </span><br><span class="line"> RestTemplate restTemplate = <span class="keyword">new</span> RestTemplate();</span><br><span class="line"> EmployeeVO result = restTemplate.getForObject(uri, EmployeeVO.class, params);</span><br><span class="line"> </span><br><span class="line"> System.out.<span class="built_in">println</span>(result);</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>POST<br><figure class="highlight haxe"><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">private</span> <span class="keyword">static</span> void createEmployee(){</span><br><span class="line"> final <span class="keyword">String</span> uri = <span class="string">"http://localhost:8080/springrestexample/employees"</span>;</span><br><span class="line"> </span><br><span class="line"> EmployeeVO <span class="keyword">new</span><span class="type">Employee</span> = <span class="keyword">new</span> <span class="type">EmployeeVO</span>(<span class="number">-1</span>, <span class="string">"Adam"</span>, <span class="string">"Gilly"</span>, <span class="string">"[email protected]"</span>);</span><br><span class="line"> </span><br><span class="line"> RestTemplate restTemplate = <span class="keyword">new</span> <span class="type">RestTemplate</span>();</span><br><span class="line"> EmployeeVO result = restTemplate.postForObject( uri, <span class="keyword">new</span><span class="type">Employee</span>, EmployeeVO.class);</span><br><span class="line"> </span><br><span class="line"> System.out.println(result);</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>Submit Form Data<br><figure class="highlight processing"><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></pre></td><td class="code"><pre><span class="line">HttpHeaders headers = <span class="keyword">new</span> HttpHeaders();</span><br><span class="line">headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);</span><br><span class="line"> </span><br><span class="line">MultiValueMap<<span class="keyword">String</span>, <span class="keyword">String</span>> <span class="built_in">map</span>= <span class="keyword">new</span> LinkedMultiValueMap<>();</span><br><span class="line"><span class="built_in">map</span>.<span class="built_in">add</span>(<span class="string">"id"</span>, <span class="string">"1"</span>);</span><br><span class="line"> </span><br><span class="line">HttpEntity<MultiValueMap<<span class="keyword">String</span>, <span class="keyword">String</span>>> request = <span class="keyword">new</span> HttpEntity<>(<span class="built_in">map</span>, headers);</span><br><span class="line"> </span><br><span class="line">RestTemplate restTemplate = <span class="keyword">new</span> RestTemplate();</span><br><span class="line">EmployeeVO result = restTemplate.postForObject( uri, request, EmployeeVO.class);</span><br><span class="line">System.out.<span class="built_in">println</span>(result);</span><br></pre></td></tr></table></figure></p>
<p>PUT<br><figure class="highlight arduino"><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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">updateEmployee</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">final</span> <span class="keyword">String</span> uri = <span class="string">"http://localhost:8080/springrestexample/employees/{id}"</span>;</span><br><span class="line"> </span><br><span class="line"> Map<<span class="keyword">String</span>, <span class="keyword">String</span>> params = <span class="keyword">new</span> HashMap<<span class="keyword">String</span>, <span class="keyword">String</span>>();</span><br><span class="line"> params.<span class="built_in">put</span>(<span class="string">"id"</span>, <span class="string">"2"</span>);</span><br><span class="line"> </span><br><span class="line"> EmployeeVO updatedEmployee = <span class="keyword">new</span> EmployeeVO(<span class="number">2</span>, <span class="string">"New Name"</span>, <span class="string">"Gilly"</span>, <span class="string">"[email protected]"</span>);</span><br><span class="line"> </span><br><span class="line"> RestTemplate restTemplate = <span class="keyword">new</span> RestTemplate();</span><br><span class="line"> restTemplate.<span class="built_in">put</span> ( uri, updatedEmployee, params);</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>Simple PUT<br><figure class="highlight haxe"><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></pre></td><td class="code"><pre><span class="line">Foo updatedInstance = <span class="keyword">new</span> <span class="type">Foo</span>(<span class="string">"newName"</span>);</span><br><span class="line">updatedInstance.setId(createResponse.getBody().getId());</span><br><span class="line"><span class="keyword">String</span> resourceUrl = </span><br><span class="line"> fooResourceUrl + <span class="string">'/'</span> + createResponse.getBody().getId();</span><br><span class="line">HttpEntity<Foo> requestUpdate = <span class="keyword">new</span> <span class="type">HttpEntity</span><>(updatedInstance, headers);</span><br><span class="line">template.exchange(resourceUrl, HttpMethod.PUT, requestUpdate, <span class="keyword">Void</span>.class);</span><br></pre></td></tr></table></figure></p>
<p>使用.exchange和请求回调<br><figure class="highlight cs"><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></pre></td><td class="code"><pre><span class="line"><span class="function">RequestCallback <span class="title">requestCallback</span>(<span class="params">final Foo updatedInstance</span>)</span> {</span><br><span class="line"> <span class="keyword">return</span> clientHttpRequest -> {</span><br><span class="line"> ObjectMapper mapper = <span class="keyword">new</span> ObjectMapper();</span><br><span class="line"> mapper.writeValue(clientHttpRequest.getBody(), updatedInstance);</span><br><span class="line"> clientHttpRequest.getHeaders().<span class="keyword">add</span>(</span><br><span class="line"> HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE);</span><br><span class="line"> clientHttpRequest.getHeaders().<span class="keyword">add</span>(</span><br><span class="line"> HttpHeaders.AUTHORIZATION, <span class="string">"Basic "</span> + getBase64EncodedLogPass());</span><br><span class="line"> };</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>DELETE<br><figure class="highlight arduino"><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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">deleteEmployee</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">final</span> <span class="keyword">String</span> uri = <span class="string">"http://localhost:8080/springrestexample/employees/{id}"</span>;</span><br><span class="line"> </span><br><span class="line"> Map<<span class="keyword">String</span>, <span class="keyword">String</span>> params = <span class="keyword">new</span> HashMap<<span class="keyword">String</span>, <span class="keyword">String</span>>();</span><br><span class="line"> params.<span class="built_in">put</span>(<span class="string">"id"</span>, <span class="string">"2"</span>);</span><br><span class="line"> </span><br><span class="line"> RestTemplate restTemplate = <span class="keyword">new</span> RestTemplate();</span><br><span class="line"> restTemplate.<span class="keyword">delete</span> ( uri, params );</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>以上便是 Spring RestTemplate 在实际开发中使用的方法，请笑纳吧！</p>
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