第五讲 乱码及RESTful风格

一、乱码的解决-通过过滤器来解决乱码

1. Spring MVC中提供了org.springframework.web.filter.CharacterEncodingFilter来解决POST乱码

  <filter>

    <filter-name>CharacterEncoding</filter-name>

    <filter-class> org.springframework.web.filter.CharacterEncodingFilter</filter-class>

    <init-param>

      <param-name>encoding</param-name>

      <param-value>utf-8</param-value>

    </init-param>

  </filter>

  <filter-mapping>

    <filter-name>CharacterEncoding</filter-name>

    <url-pattern> /*</url-pattern>

  </filter-mapping>

     @RequestMapping(value="/hello")

     public String user(@RequestParam("uname") Stringuname, ModelMap model)

                throws UnsupportedEncodingException {

           model.addAttribute("name", uname);

           return "index.jsp";

     }

model.addAttribute("name", uname);直接使用即可。

2. 如果是GET方式乱码

          

修改Tomcat的 server.xml配置文件解决

自定义乱码解决的过滤器

注意：GET请求的乱码解决是通过 value = new String(value.getBytes("iso-8859-1"), encoding); POST请求则是通过 // 设置request编码 httpRequest.setCharacterEncoding(encoding); // 设置response编码 httpResponse.setContentType("text/html;charset=" + encoding);      @RequestMapping(value="/hello")      public String user(@RequestParam( "uname") String uname, ModelMap model,                  HttpServletRequest request)                 throws UnsupportedEncodingException {            model.addAttribute("name", request.getAttribute("uname"));            return "index.jsp";      }   <filter>     <filter-name>CharacterEncoding</filter-name>     <filter-class> com.liujie.filter.CharacterEncodingFilter</filter-class>     <init-param>       <param-name>encoding</param-name>       <param-value>utf-8</param-value>     </init-param>   </filter>   <filter-mapping>     <filter-name>CharacterEncoding</filter-name>     <url-pattern> *.do</url-pattern>   </filter-mapping> 注意：<url-pattern> *.do</url-pattern>，不能够拦截 /*。

二、RESTful风格的URL

      优点：轻量级、安全、效率高

      //http://localhost:8080/springmvc/1/123/hello.do

     @RequestMapping(value="/{ id}/{ uid}/hello")

     public String user(@PathVariable(" id") int id, @PathVariable(" uid") int uid) {

           System.out.println(id);

           System.out.println(uid);

           return "/index.jsp";

     }

     @RequestMapping(value="/{ id}/{ uid}/hello")

     public String user(@PathVariable int id, @PathVariable int uid)

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三、同一个Controller通过参数来到达不同的处理方法-不重要

提交URL：

处理代码： @Controller @RequestMapping("/hello") public class HelloController {      //http://localhost:8080/springmvc/hello.do?method=add      @RequestMapping(params="method=add", method=RequestMethod.GET)      public String add() {            System.out.println("add");            return "redirect:/index.jsp";      }      @RequestMapping(params="method=update", method=RequestMethod.GET)      public String update() {            System.out.println("update");            return "redirect:/index.jsp";      }      @RequestMapping(params="method=delete", method=RequestMethod.GET)      public String delete() {            System.out.println("delete");            return "redirect:/index.jsp";      } }