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首页编程语言正文

一、新建一个Controller

package cn.cfs.springmvc.service; 
 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import org.springframework.stereotype.Service; 
import cn.cfs.springmvc.domain.User; 
 
@Service 
public class UserService { 
    private static Map<Integer, User> map = new HashMap<Integer, User>(); 
    static { 
        User user = null; 
        for (int i = 1; i < 11; i++) { 
            user = new User(); 
            user.setId(i); 
            user.setUsername("cifeng" + i); 
            user.setPassword("88888888"); 
            map.put(i, user); 
        } 
    } 
 
    public List<User> list() { 
        return new ArrayList<User>(map.values()); 
    } 
 
}
UserService 
package cn.cfs.springmvc.controller; 
 
import java.util.Map; 
import javax.annotation.Resource; 
import org.springframework.stereotype.Controller; 
import org.springframework.ui.Model; 
import org.springframework.web.bind.annotation.RequestMapping; 
import cn.cfs.springmvc.service.UserService; 
 
@Controller 
@RequestMapping(value={"/user"}) 
public class UserController { 
    @Resource 
    private UserService us; 
     
    @RequestMapping(value={"/list"}) 
    public String list(Map<String,Object> model){ 
        //准备数据 
        model.put("users", us.list()); 
        return "jUserList"; 
    } 
     
    @RequestMapping(value={"/list2"}) 
    public String listByAttr(Model model){ 
        //准备数据 
        model.addAllAttributes(us.list()); 
        return "jUserList"; 
    } 
     
}
UserController

二、jsp页面获取存入的对象

<%@ page language="java" contentType="text/html; charset=utf-8" 
    pageEncoding="utf-8"%> 
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
<title>查询</title> 
</head> 
<body> 
    <table> 
        <tr> 
            <td>id</td> 
            <td>name</td> 
            <td>password</td> 
        </tr> 
        <c:forEach items="${users }" var="u">  
        <tr> 
            <td>${u.id }</td> 
            <td>${u.username }</td> 
            <td>${u.password }</td> 
        </tr>     
        </c:forEach> 
    </table> 
     
</body> 
</html>

注意：通过访问/user/list.action 可以得到如下页面：

但是如果通过/user/list2.action该如何取值呢？

只需要将items的值users 换成userList即可，这是一种约定，用传入的实体对象+List即可 例如我传入的是list<User> 集合 那么 实体类是user+List

<%@page import="org.apache.jasper.tagplugins.jstl.core.ForEach"%> 
<%@ page language="java" contentType="text/html; charset=utf-8" 
    pageEncoding="utf-8"%> 
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
<title>查询</title> 
</head> 
<body> 
    <table> 
        <tr> 
            <td>id</td> 
            <td>name</td> 
            <td>password</td> 
        </tr> 
        <c:forEach items="${userList }" var="u">  
        <tr> 
            <td>${u.id }</td> 
            <td>${u.username }</td> 
            <td>${u.password }</td> 
        </tr>     
        </c:forEach> 
    </table> 
     
</body> 
</html>
/user/list2

ok,页面效果是和上面一样的。

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