ModelAttribute用法之一

@ModelAttribute也可以做为Model输出到View时使用,比如:

测试例子

 
package com.my.controller;

import java.util.ArrayList;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.my.controller.bean.Account;

@Controller
@RequestMapping(value="attr")
public class TestModelAttributeController {
    
    private static List<Account> accounts = new ArrayList<Account>();
    {
        accounts.add(new Account());
        accounts.add(new Account());
        
        Account ac1 = accounts.get(0);
        Account ac2 = accounts.get(1);
        
        ac1.setUserName("Robin");
        ac1.setPassword("123123");
        
        ac2.setUserName("Lucy");
        ac2.setPassword("123456");
    }

    @RequestMapping(method=RequestMethod.GET)
    public String index() {
        System.out.println("index");
        return "TestModelAttribute/index";
    }
    
    @ModelAttribute("accounts")
    public List<Account> getAccounts() {
        System.out.println("getAccounts");
        return accounts;
    }
    
}
 
 
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> 
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<%@ taglib prefix="st" uri="http://www.springframework.org/tags" %>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<!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>TestModelAttribute</title>
</head>
<body>
    <c:forEach items="${accounts}" var="item">
        <c:out value="${item.userName}"></c:out><br/>
    </c:forEach>
</body>
</html>
 

页面将输出:

在Console中输出为:

 

这里可以看到,运行的先后次序为:先调用getAccounts(),再调用index()。

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posted @ 2018-05-31 16:37  佳宁  阅读(2211)  评论(0编辑  收藏  举报