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()); } }
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"; } }
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>
ok,页面效果是和上面一样的。