springmvc基础篇—使用注解方式为前台提供数据

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。

巴特西

springmvc基础篇—使用注解方式为前台提供数据

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