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1. 处理模型数据之ModelAndView
首先ModelAndView 分为两部分:model和view。model负责的是从后面接收回来的参数,view就是视图就是指定的jsp页面。例如:ModelAndView mv = new ModelAndView(“test”); 所以当return mv的时候,其中view就是test.jsp页面,代码如下
ModelAndView mv = new ModelAndView("test");//文件名(例如JSP: test.jsp)
mv.addObject("username", "wang"); //"hellow"为传到jsp的数据,用aa取
Demo如下:
<form action="springmvc/TestModelAndView" method="post">
用户名<input type="text" name="username"/><br/>
<input type="submit" value="提交">
</form>
@RequestMapping("/TestModelAndView")
private static final String SUCCESS = "success";
public ModelAndView TestModelAndView(@RequestParam("username") String username){
ModelAndView mv=new ModelAndView(SUCCESS);
mv.addObject("username",username);
return mv;
}
JSP页面展示:${username}
2. 处理模型数据之Map
<a href="springmvc/TestMap">TestMap</a><br/>
private static final String SUCCESS = "success";
@RequestMapping("/TestMap")
public String TestMap(Map<String,Object> map){
map.put("city", Arrays.asList("Dog","Cat","bird"));
return SUCCESS;
}
展示页面:${city}
3. 处理模型数据之SessionAttributes
SessionAttributes除了可以通过value值来指定放入Session里的内容外,还可以使用types属性值来指定
注意:SessionAttributes只能修饰类,不能修饰方法
@Controller
@SessionAttributes(value={"user"},types={String.class})
@RequestMapping("/springmvc")
public class SpringMVCTest {
private static final String SUCCESS = "success";
@RequestMapping("/TestSessionAttributs")
public String TestSessionAttributs(Map<String,Object> map){
User user=new User("wang","123",50);
map.put("user", user);
map.put("pass", "123456");
return SUCCESS;
}
}
展示页面:
requestScope用户名${requestScope.user.username} <br>
requestScope密码${requestScope.pass} <br>
SessionScope用户名${sessionScope.user} <br>
SessionScope密码${sessionScope.pass} <br>