参数传递

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")@ResponseBodypublic 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