SpringMVC数据传递及数据处理

ModelAndView传递

• 编写controller

  @Controller
  @RequestMapping("/account")
  public class AccountController {
  
      //也可以不创建ModelAndView，直接在参数中指定
      @RequestMapping(value = "/findAccount9")
      public ModelAndView findAccount9(ModelAndView mv) {
          mv.addObject("msg", "欢迎你 springmvc");
          mv.setViewName("success");
          return mv;
      }
  }
  

• 在index.jsp里面定义超链接

  <a href="/account/findAccount9">ModelAndView参数传递</a>
  

Model传递

• 编写controller

  @Controller
  @RequestMapping("/account")
  public class AccountController {
  
      @RequestMapping(value = "/findAccount10")
      public String findAccount10(Model model) {
          model.addAttribute("msg", "欢迎你 springmvc");
          return "success";
      }
  }
  

• 在index.jsp里面定义超链接

  <a href="/account/findAccount10">Model参数传递</a>
  

ServletAPI传递

• 编写controller

  @Controller
  @RequestMapping("/account")
  public class AccountController {
  
      @RequestMapping("/findAccount11")
      public String findAccount11(HttpServletRequest request, 
                                  HttpServletResponse response){
          request.setAttribute("msg","欢迎你 springmvc");
          return "success";
      }
  }
  

• 在index.jsp里面定义超链接

  <a href="/account/findAccount11">ServletAPI传递</a>
  

JSON数据处理

添加json依赖

springmvc 默认使用jackson作为json类库,不需要修改applicationContext-servlet.xml任何配置，只需引入以下类库springmvc就可以处理json数据：

<!--spring-json依赖-->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.0</version>
</dependency>

注解

• @RequestBody：作用是接收前端ajax传递给后端的json字符串，并将json格式的数据转为java对象
• @ResponseBody：作用是将java对象转为json格式的数据传递给前台ajax

案例

• 编写controller

  @Controller
  @RequestMapping("/account")
  public class AccountController {
  
      @RequestMapping("/saveAccount2")
      @ResponseBody
      public Map saveAccount2(@RequestBody Account account){
          Map<String, Object> map = new HashMap<String, Object>();
          map.put("status",200);
          map.put("msg",account);
          return map;
      }
  }
  

• 在index.jsp里面定义ajax请求

  • 添加按钮

    <input type="button" value="测试ajax请求json和响应json" id="testJson"/>
    

  • 引入js库文件

    <script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
    

  • 编写ajax代码

      <script type="text/javascript">
        $(function(){
          $("#testJson").click(function(){
            $.ajax({
              type:"post",
              url:"/account/saveAccount2",
              contentType:"application/json;charset=UTF-8",
              data:'{"id":1,"name":"张二狗","money":999.0}',
              success:function(data){
                if(data.status == 200){
                  alert(data.msg.name);
                  alert(data.msg.money);
                }
              }
            })
          });
        })
      </script>
    

• 测试