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<h2 id="踩坑记录"><a href="#踩坑记录" class="headerlink" title="踩坑记录"></a>踩坑记录</h2><h4 id="1-数据库时区有关异常"><a href="#1-数据库时区有关异常" class="headerlink" title="1. 数据库时区有关异常"></a>1. 数据库时区有关异常</h4><ul>
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<h4 id="2-更换Maven源"><a href="#2-更换Maven源" class="headerlink" title="2. 更换Maven源"></a>2. 更换Maven源</h4><ul>
<li>解决方案：在setting.xml中加入国内源</li>
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<h1 id="Linux环境配置常见问题"><a href="#Linux环境配置常见问题" class="headerlink" title="Linux环境配置常见问题"></a>Linux环境配置常见问题</h1><h2 id="1-换清华源"><a href="#1-换清华源" class="headerlink" title="1. 换清华源"></a>1. 换清华源</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">$ cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup <span class="comment">#备份</span></span><br><span class="line">$ vim /etc/yum.repos.d/CentOS-Base.repo <span class="comment">#将内容修改如下</span></span><br></pre></td></tr></table></figure>
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<h1 id="SpringMVC——文件上传、异常处理、拦截器"><a href="#SpringMVC——文件上传、异常处理、拦截器" class="headerlink" title="SpringMVC——文件上传、异常处理、拦截器"></a>SpringMVC——文件上传、异常处理、拦截器</h1><h2 id="1-异常处理"><a href="#1-异常处理" class="headerlink" title="1. 异常处理"></a>1. 异常处理</h2><p>系统中异常包括两类：预期异常和运行时异常 <code>RuntimeException</code>，前者通过捕获异常从而获取异常信息， 后者主要通过规范代码开发、测试通过手段减少运行时异常的发生。 系统的 dao、service、controller 出现都通过 <code>throws Exception</code>向上抛出，最后由 <code>springmvc</code> 前端 控制器交由异常处理器进行异常处理。</p>
<h3 id="1-处理方式1"><a href="#1-处理方式1" class="headerlink" title="1. 处理方式1"></a>1. 处理方式1</h3><p>自定义异常处理类，并实现<code>HandlerExceptionResolver</code>接口。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">SysExceptionResolver</span> <span class="keyword">implements</span> <span class="title">HandlerExceptionResolver</span> </span>{</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> ModelAndView <span class="title">resolveException</span><span class="params">(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e)</span> </span>{</span><br><span class="line"> <span class="comment">//获取异常</span></span><br><span class="line"> SysException ex = <span class="keyword">null</span>;</span><br><span class="line"> <span class="keyword">if</span>(e <span class="keyword">instanceof</span> SysException){</span><br><span class="line"> ex = (SysException) e;</span><br><span class="line"> }<span class="keyword">else</span>{</span><br><span class="line"> ex = <span class="keyword">new</span> SysException(<span class="string">"系统正在维护"</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">//创建ModelAndView对象</span></span><br><span class="line"> ModelAndView mv= <span class="keyword">new</span> ModelAndView();</span><br><span class="line"> mv.addObject(<span class="string">"errorMsg"</span>,e.getMessage());</span><br><span class="line"> mv.setViewName(<span class="string">"error"</span>);</span><br><span class="line"> <span class="keyword">return</span> mv;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<h1 id="Spring-MVC——参数和返回值"><a href="#Spring-MVC——参数和返回值" class="headerlink" title="Spring MVC——参数和返回值"></a>Spring MVC——参数和返回值</h1><h2 id="0-介绍"><a href="#0-介绍" class="headerlink" title="0. 介绍"></a>0. 介绍</h2><p>SpringMVC 是一种基于<code>Java</code>的实现MVC设计模型的请求驱动类型的轻量级 Web 框架，属于 <code>Spring FrameWork</code>的后续产品，已经融合在 <code>Spring Web Flow</code>里面。<code>Spring</code> 框架提供了构建 Web 应用程序的全功能 MVC 模块。</p>
<p>它通过一套注解，让一个简单的<code>Java</code>类成为处理请求的控制器，而无须实现任何接口。同时它还支<code>持RESTful</code>编程风格的请求。 </p>
<img src="/2020/11/11/springmvc1/springmvc.png" class="" title="SpringMVC">
<p><code>Spring MVC</code>的执行流程如下</p>
<img src="/2020/11/11/springmvc1/process.png" class="" title="执行流程">
<h2 id="1-常用注解"><a href="#1-常用注解" class="headerlink" title="1. 常用注解"></a>1. 常用注解</h2><p><code>@RequestMapping</code>：建立请求URL和处理方法之间的对应关系，作用在类或者方法上。</p>
<p><code>@RequestParam</code>：把请求中的指定名称的参数传递给控制器中的形参赋值</p>
<p>举例：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@RequestMapping</span>(<span class="string">"/useRequestParam"</span>)</span><br><span class="line"><span class="function"><span class="keyword">public</span> String <span class="title">useRequestParam</span><span class="params">(@RequestParam(<span class="string">"name"</span>)</span>String username,</span></span><br><span class="line"><span class="function"> @<span class="title">RequestParam</span><span class="params">(value=<span class="string">"age"</span>,required=<span class="keyword">false</span>)</span> Integer age)</span>{</span><br><span class="line"> System.out.println(username+<span class="string">","</span>+age);</span><br><span class="line"> <span class="keyword">return</span> <span class="string">"success"</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p><code>@RequestBody</code>：直接以<code>key=value</code>的形式获取请求体内容（<code>String</code>类型）或者<code>Java</code>对象。用于<code>POST</code>请求。</p>
<p><code>@PathVaribale</code>：用于绑定 url中的占位符。例如：请求 url 中 <code>/delete/{id}</code>，这个<code>{id}</code>就是 url 占位符。</p>
<p><code>@ModelAttribute</code>：出现在方法上，表示当前方法会在控制器方法之前执行。也可以出现在参数上，获取指定的数据给参数赋值。</p>
<p>应用场景：当表单提交数据不是完整的实体类数据时，保证没有提交数据的字段使用数据库对象原来的数据。</p>
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