本文是基于SpringMVC注解的方式来实现页面与后台之间参数的传递，本文主要侧重于从后台传递到前台view。
内容：
1、后台传递单个对象User到前台；
2、后台传递集合对象到前台（分Map和List两种情形）
下面的内容基于SpringMVC工程配置已经准备好，该工程是用maven搭建的。
一：传递单个对象(以用户对象User为例)
User类：
public class User {
private Integer userId;
//用户名
private String userName;
//密码
private String password;
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this. userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this. userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this. password = password;
}
}
Controller类：
@Controller
@RequestMapping(value="/test" )
public class DemoController {
@RequestMapping(value= "/param")
public String testParam(Model model ){
User u1 = new User();
u1.setUserId(1);
u1.setPassword( "123456");
u1.setUserName( "张三");
model.addAttribute( "user", u1);
return "param" ;
}
}
param.jsp页面：
<%@ page language ="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@taglib prefix ="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<body >
用户名：${user.userName}
密码：${user.password}
</body >
</html>
二：传递Map集合对象(以Map<String,User>为例)
User类同上；
Controller类：
@Controller
@RequestMapping(value="/test" )
public class DemoController {
@RequestMapping(value= "/param")
public String testParam(Model model){
return mapInfo();
}
/*
* ModelAndView：它代表了Spring Web MVC中呈现画面时所使用的Model与View，
* 由于Java一次只能返回一个物件，所以ModelAndView的作用封装这两个物件，以方便您一次返回Model与View这两个物件。
* @return
*/
private ModelAndView mapInfo(){
Map<String,Object> map = new HashMap<String, Object>();
User u1 = new User();
u1.setUserId(1);
u1.setPassword( "123456");
u1.setUserName( "张三");
User u2 = new User();
u2.setUserId(1);
u2.setPassword( "123456");
u2.setUserName( "张四");
map.put( "user1", u1);
map.put( "user2", u2);
/*
* 1、" param":试图名，即跳转到param.jsp页面
* 2、"map"：传递的对象为map类型
* 3、map:被传递的对象
*/
return new ModelAndView( "param", "map", map);
}
}
param.jsp页面：
<%@ page language ="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@taglib prefix ="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<body >
<c:forEach items ="${requestScope.map}" var= "m">
${m.key} : ${m.value.userName} <br />
</c:forEach >
</body >
</html>
三：传递List集合对象(以List<User>为例)
User类同上；
Controller类：
@Controller
@RequestMapping(value="/test" )
public class DemoController {
@RequestMapping(value= "/param")
public String testParam(Model model){
model.addAttribute( listInfo());
return "param";
}
public @ModelAttribute List<User> listInfo(){
List<User> list = new ArrayList<User>();
User u1 = new User();
u1.setUserId(1);
u1.setPassword( "123456");
u1.setUserName( "张三");
User u2 = new User();
u2.setUserId(1);
u2.setPassword( "123456");
u2.setUserName( "张四");
User u3 = new User();
u3.setUserId(1);
u3.setPassword( "123456");
u3.setUserName( "张五");
list.add( u3);
list.add( u2);
list.add( u1);
return list;
}
}
param.jsp页面：
<%@ page language ="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@taglib prefix ="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<body >
<c:forEach items ="${requestScope.userList}" var= "m">
用户名：${m.userName}；密码：${m.password} <br />
</c:forEach >
</body >
</html>
时间： 2024-07-29 06:37:59