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SpringMVC面试题总结.html
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<h4 id="1、什么是Spring-MVC-？简单介绍下你对springMVC的理解"><a href="#1、什么是Spring-MVC-？简单介绍下你对springMVC的理解" class="headerlink" title="1、什么是Spring MVC ？简单介绍下你对springMVC的理解?"></a>1、什么是Spring MVC ？简单介绍下你对springMVC的理解?</h4><p>Spring MVC是一个基于Java的实现了MVC设计模式的请求驱动类型的轻量级Web框架，通过把Model，View，Controller分离，将web层进行职责解耦，把复杂的web应用分成逻辑清晰的几部分，简化开发，减少出错，方便组内开发人员之间的配合。<br><a id="more"></a></p>
<h4 id="2、SpringMVC的流程？"><a href="#2、SpringMVC的流程？" class="headerlink" title="2、SpringMVC的流程？"></a>2、SpringMVC的流程？</h4><p>（1）用户发送请求至前端控制器DispatcherServlet；<br>（2） DispatcherServlet收到请求后，调用HandlerMapping处理器映射器，请求获取Handle；<br>（3）处理器映射器根据请求url找到具体的处理器，生成处理器对象及处理器拦截器(如果有则生成)一并返回给DispatcherServlet；<br>（4）DispatcherServlet 调用 HandlerAdapter处理器适配器；<br>（5）HandlerAdapter 经过适配调用 具体处理器(Handler，也叫后端控制器)；<br>（6）Handler执行完成返回ModelAndView；<br>（7）HandlerAdapter将Handler执行结果ModelAndView返回给DispatcherServlet；<br>（8）DispatcherServlet将ModelAndView传给ViewResolver视图解析器进行解析；<br>（9）ViewResolver解析后返回具体View；<br>（10）DispatcherServlet对View进行渲染视图（即将模型数据填充至视图中）<br>（11）DispatcherServlet响应用户。</p>
<p><img src="https://img-blog.csdn.net/20180708224853769?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E3NDUyMzM3MDA=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="在这里插入图片描述"></p>
<h4 id="3、SpringMVC的优点"><a href="#3、SpringMVC的优点" class="headerlink" title="3、SpringMVC的优点:"></a>3、SpringMVC的优点:</h4><p>（1）可以支持各种视图技术,而不仅仅局限于JSP；</p>
<p>（2）与Spring框架集成（如IoC容器、AOP等）；</p>
<p>（3）清晰的角色分配：前端控制器(dispatcherServlet) , 请求到处理器映射（handlerMapping), 处理器适配器（HandlerAdapter), 视图解析器（ViewResolver）。</p>
<p>（4） 支持各种请求资源的映射策略。</p>
<h4 id="4、Spring-MVC的主要组件？"><a href="#4、Spring-MVC的主要组件？" class="headerlink" title="4、Spring MVC的主要组件？"></a>4、Spring MVC的主要组件？</h4><p>（1）前端控制器 DispatcherServlet（不需要程序员开发）</p>
<p>作用：接收请求、响应结果，相当于转发器，有了DispatcherServlet 就减少了其它组件之间的耦合度。</p>
<p>（2）处理器映射器HandlerMapping（不需要程序员开发）</p>
<p>作用：根据请求的URL来查找Handler</p>
<p>（3）处理器适配器HandlerAdapter</p>
<p>注意：在编写Handler的时候要按照HandlerAdapter要求的规则去编写，这样适配器HandlerAdapter才可以正确的去执行Handler。</p>
<p>（4）处理器Handler（需要程序员开发）</p>
<p>（5）视图解析器 ViewResolver（不需要程序员开发）</p>
<p>作用：进行视图的解析，根据视图逻辑名解析成真正的视图（view）</p>
<p>（6）视图View（需要程序员开发jsp）</p>
<p>View是一个接口， 它的实现类支持不同的视图类型（jsp，freemarker，pdf等等）</p>
<h4 id="5、SpringMVC和struts2的区别有哪些"><a href="#5、SpringMVC和struts2的区别有哪些" class="headerlink" title="5、SpringMVC和struts2的区别有哪些?"></a>5、SpringMVC和struts2的区别有哪些?</h4><p>（1）springmvc的入口是一个servlet即前端控制器（DispatchServlet），而struts2入口是一个filter过虑器（StrutsPrepareAndExecuteFilter）。</p>
<p>（2）springmvc是基于方法开发(一个url对应一个方法)，请求参数传递到方法的形参，可以设计为单例或多例(建议单例)，struts2是基于类开发，传递参数是通过类的属性，只能设计为多例。</p>
<p>（3）Struts采用值栈存储请求和响应的数据，通过OGNL存取数据，springmvc通过参数解析器是将request请求内容解析，并给方法形参赋值，将数据和视图封装成ModelAndView对象，最后又将ModelAndView中的模型数据通过reques域传输到页面。Jsp视图解析器默认使用jstl。</p>
<h4 id="6、SpringMVC怎么样设定重定向和转发的？"><a href="#6、SpringMVC怎么样设定重定向和转发的？" class="headerlink" title="6、SpringMVC怎么样设定重定向和转发的？"></a>6、SpringMVC怎么样设定重定向和转发的？</h4><p>（1）转发：在返回值前面加”forward:”，譬如”forward:user.do?name=method4”</p>
<p>（2）重定向：在返回值前面加”redirect:”，譬如”redirect:<a href="http://www.baidu.com"" target="_blank" rel="noopener">http://www.baidu.com"</a></p>
<h4 id="7、SpringMVC怎么和AJAX相互调用的？"><a href="#7、SpringMVC怎么和AJAX相互调用的？" class="headerlink" title="7、SpringMVC怎么和AJAX相互调用的？"></a>7、SpringMVC怎么和AJAX相互调用的？</h4><p>通过Jackson框架就可以把Java里面的对象直接转化成Js可以识别的Json对象。具体步骤如下 ：<br>（1）加入Jackson.jar<br>（2）在配置文件中配置json的映射<br>（3）在接受Ajax方法里面可以直接返回Object,List等,但方法前面要加上@ResponseBody注解。</p>
<h4 id="8、如何解决POST请求中文乱码问题，GET的又如何处理呢？"><a href="#8、如何解决POST请求中文乱码问题，GET的又如何处理呢？" class="headerlink" title="8、如何解决POST请求中文乱码问题，GET的又如何处理呢？"></a>8、如何解决POST请求中文乱码问题，GET的又如何处理呢？</h4><p><strong>（1）解决post请求乱码问题：</strong></p>
<p>在web.xml中配置一个CharacterEncodingFilter过滤器，设置成utf-8；</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></pre></td><td class="code"><pre><span class="line"><filter></span><br><span class="line"> <filter-name>CharacterEncodingFilter</filter-name></span><br><span class="line"> <filter-<span class="class"><span class="keyword">class</span>><span class="title">org</span>.<span class="title">springframework</span>.<span class="title">web</span>.<span class="title">filter</span>.<span class="title">CharacterEncodingFilter</span></<span class="title">filter</span>-<span class="title">class</span>></span></span><br><span class="line"><span class="class"> <<span class="title">init</span>-<span class="title">param</span>></span></span><br><span class="line"><span class="class"> <<span class="title">param</span>-<span class="title">name</span>><span class="title">encoding</span></<span class="title">param</span>-<span class="title">name</span>></span></span><br><span class="line"><span class="class"> <<span class="title">param</span>-<span class="title">value</span>><span class="title">utf</span>-8</<span class="title">param</span>-<span class="title">value</span>></span></span><br><span class="line"><span class="class"> </<span class="title">init</span>-<span class="title">param</span>></span></span><br><span class="line"><span class="class"></<span class="title">filter</span>></span></span><br><span class="line"><span class="class"><<span class="title">filter</span>-<span class="title">mapping</span>></span></span><br><span class="line"><span class="class"> <<span class="title">filter</span>-<span class="title">name</span>><span class="title">CharacterEncodingFilter</span></<span class="title">filter</span>-<span class="title">name</span>></span></span><br><span class="line"><span class="class"> <<span class="title">url</span>-<span class="title">pattern</span>>/ * </<span class="title">url</span>-<span class="title">pattern</span>></span></span><br><span class="line"><span class="class"></<span class="title">filter</span>-<span class="title">mapping</span>></span></span><br></pre></td></tr></table></figure>
<p><strong>(2）get请求中文参数出现乱码解决方法有两个：</strong></p>
<p>①修改tomcat配置文件添加编码与工程编码一致，如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><ConnectorURIEncoding=<span class="string">"utf-8"</span> connectionTimeout=<span class="string">"20000"</span> port=<span class="string">"8080"</span> protocol=<span class="string">"HTTP/1.1"</span> redirectPort=<span class="string">"8443"</span>/></span><br></pre></td></tr></table></figure>
<p>②另外一种方法对参数进行重新编码：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">String userName = <span class="keyword">new</span> String(request.getParamter(<span class="string">"userName"</span>).getBytes(<span class="string">"ISO8859-1"</span>),<span class="string">"utf-8"</span>)</span><br></pre></td></tr></table></figure>
<p>ISO8859-1是tomcat默认编码，需要将tomcat编码后的内容按utf-8编码。</p>
<h4 id="9、Spring-MVC的异常处理-？"><a href="#9、Spring-MVC的异常处理-？" class="headerlink" title="9、Spring MVC的异常处理 ？"></a>9、Spring MVC的异常处理 ？</h4><p>答：可以将异常抛给Spring框架，由Spring框架来处理；我们只需要配置简单的异常处理器，在异常处理器中添视图页面即可。</p>
<h4 id="10、SpringMvc的控制器是不是单例模式-如果是-有什么问题-怎么解决？"><a href="#10、SpringMvc的控制器是不是单例模式-如果是-有什么问题-怎么解决？" class="headerlink" title="10、SpringMvc的控制器是不是单例模式,如果是,有什么问题,怎么解决？"></a>10、SpringMvc的控制器是不是单例模式,如果是,有什么问题,怎么解决？</h4><p>答：是单例模式,所以在多线程访问的时候有线程安全问题,不要用同步,会影响性能的,解决方案是在控制器里面不能写字段。</p>
<h4 id="11、-SpringMVC常用的注解有哪些？"><a href="#11、-SpringMVC常用的注解有哪些？" class="headerlink" title="11、 SpringMVC常用的注解有哪些？"></a>11、 SpringMVC常用的注解有哪些？</h4><p>@RequestMapping：用于处理请求 url 映射的注解，可用于类或方法上。用于类上，则表示类中的所有响应请求的方法都是以该地址作为父路径。<br>@RequestBody：注解实现接收http请求的json数据，将json转换为java对象。<br>@ResponseBody：注解实现将conreoller方法返回对象转化为json对象响应给客户。</p>
<h4 id="12、SpingMvc中的控制器的注解一般用那个-有没有别的注解可以替代？"><a href="#12、SpingMvc中的控制器的注解一般用那个-有没有别的注解可以替代？" class="headerlink" title="12、SpingMvc中的控制器的注解一般用那个,有没有别的注解可以替代？"></a>12、SpingMvc中的控制器的注解一般用那个,有没有别的注解可以替代？</h4><p>答：一般用@Controller注解,也可以使用@RestController,@RestController注解相当于@ResponseBody ＋ @Controller,表示是表现层,除此之外，一般不用别的注解代替。</p>
<h4 id="13、如果在拦截请求中，我想拦截get方式提交的方法-怎么配置？"><a href="#13、如果在拦截请求中，我想拦截get方式提交的方法-怎么配置？" class="headerlink" title="13、如果在拦截请求中，我想拦截get方式提交的方法,怎么配置？"></a>13、如果在拦截请求中，我想拦截get方式提交的方法,怎么配置？</h4><p>答：可以在@RequestMapping注解里面加上method=RequestMethod.GET。</p>
<h4 id="14、怎样在方法里面得到Request-或者Session？"><a href="#14、怎样在方法里面得到Request-或者Session？" class="headerlink" title="14、怎样在方法里面得到Request,或者Session？"></a>14、怎样在方法里面得到Request,或者Session？</h4><p>答：直接在方法的形参中声明request,SpringMvc就自动把request对象传入。</p>
<h4 id="15、如果想在拦截的方法里面得到从前台传入的参数-怎么得到？"><a href="#15、如果想在拦截的方法里面得到从前台传入的参数-怎么得到？" class="headerlink" title="15、如果想在拦截的方法里面得到从前台传入的参数,怎么得到？"></a>15、如果想在拦截的方法里面得到从前台传入的参数,怎么得到？</h4><p>答：直接在形参里面声明这个参数就可以,但必须名字和传过来的参数一样。</p>
<h4 id="16、如果前台有很多个参数传入-并且这些参数都是一个对象的-那么怎么样快速得到这个对象？"><a href="#16、如果前台有很多个参数传入-并且这些参数都是一个对象的-那么怎么样快速得到这个对象？" class="headerlink" title="16、如果前台有很多个参数传入,并且这些参数都是一个对象的,那么怎么样快速得到这个对象？"></a>16、如果前台有很多个参数传入,并且这些参数都是一个对象的,那么怎么样快速得到这个对象？</h4><p>答：直接在方法中声明这个对象,SpringMvc就自动会把属性赋值到这个对象里面。</p>
<h4 id="17、SpringMvc中函数的返回值是什么？"><a href="#17、SpringMvc中函数的返回值是什么？" class="headerlink" title="17、SpringMvc中函数的返回值是什么？"></a>17、SpringMvc中函数的返回值是什么？</h4><p>答：返回值可以有很多类型,有String, ModelAndView。ModelAndView类把视图和数据都合并的一起的，但一般用String比较好。</p>
<h4 id="18、SpringMvc用什么对象从后台向前台传递数据的？"><a href="#18、SpringMvc用什么对象从后台向前台传递数据的？" class="headerlink" title="18、SpringMvc用什么对象从后台向前台传递数据的？"></a>18、SpringMvc用什么对象从后台向前台传递数据的？</h4><p>答：通过ModelMap对象,可以在这个对象里面调用put方法,把对象加到里面,前台就可以通过el表达式拿到。</p>
<h4 id="19、怎么样把ModelMap里面的数据放入Session里面？"><a href="#19、怎么样把ModelMap里面的数据放入Session里面？" class="headerlink" title="19、怎么样把ModelMap里面的数据放入Session里面？"></a>19、怎么样把ModelMap里面的数据放入Session里面？</h4><p>答：可以在类上面加上@SessionAttributes注解,里面包含的字符串就是要放入session里面的key。</p>
<h4 id="20、SpringMvc里面拦截器是怎么写的："><a href="#20、SpringMvc里面拦截器是怎么写的：" class="headerlink" title="20、SpringMvc里面拦截器是怎么写的："></a>20、SpringMvc里面拦截器是怎么写的：</h4><p>有两种写法,一种是实现HandlerInterceptor接口，另外一种是继承适配器类，接着在接口方法当中，实现处理逻辑；然后在SpringMvc的配置文件中配置拦截器即可：</p>
<figure class="highlight"><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"> <!-- 配置SpringMvc的拦截器 --></span><br><span class="line"> </span><br><span class="line"><mvc:interceptors></span><br><span class="line"> </span><br><span class="line"> <!-- 配置一个拦截器的Bean就可以了 默认是对所有请求都拦截 --></span><br><span class="line"> </span><br><span class="line"> <bean id="myInterceptor" class="com.zwp.action.MyHandlerInterceptor"></bean></span><br><span class="line"> </span><br><span class="line"> <!-- 只针对部分请求拦截 --></span><br><span class="line"> </span><br><span class="line"> <mvc:interceptor></span><br><span class="line"> </span><br><span class="line"> <mvc:mapping path=<span class="string">"/modelMap.do"</span> /></span><br><span class="line"> </span><br><span class="line"> <bean <span class="class"><span class="keyword">class</span></span>=<span class="string">"com.zwp.action.MyHandlerInterceptorAdapter"</span> /></span><br><span class="line"> </span><br><span class="line"> </mvc:interceptor></span><br><span class="line"> </span><br><span class="line"></mvc:interceptors></span><br></pre></td></tr></table></figure>
<h4 id="21、注解原理："><a href="#21、注解原理：" class="headerlink" title="21、注解原理："></a>21、注解原理：</h4><p>注解本质是一个继承了Annotation的特殊接口，其具体实现类是Java运行时生成的动态代理类。我们通过反射获取注解时，返回的是Java运行时生成的动态代理对象。通过代理对象调用自定义注解的方法，会最终调用AnnotationInvocationHandler的invoke方法。该方法会从memberValues这个Map中索引出对应的值。而memberValues的来源是Java常量池。</p>
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</li>
<li class="search-li">
<a href="http://qzmvc1.top/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>Qzmvc1</a>
</li>
<li class="search-li">
<a href="https://szd0319.github.io/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>宋振栋</a>
</li>
</ul>
</section>
<section class="tools-section tools-section-me" q-show="aboutme">
<div class="aboutme-wrap" id="js-aboutme">知我者谓我心忧，不知我者谓我何求</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>