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[4] spring mvc学习笔记

2024-07-26 04:41:01   217人阅读

基于spring MVC的用户管理

以实际小项目出发来深入理解spring MVC

1.首先是User类

public class User {
	
	private int id;
	private String username;
	private String password;
	private String nickname;
	private String email;        省略构造函数和get、set方法        }

2.接着UserController的编写

几点注意：

(1).两种跳转方式，服务器端跳转(带参数)   return "redirect:/user/users"; 并返回相关错误信息 和客户端跳转(理解为重定向)  return "user/add";

(2).通过model对象将信息返回给视图层；

(3).get和post请求分开处理；

(4).相关的validate验证，需要导入bean-validate.jar包，下面JavaBean中细说。

package com.qzp.web;

import java.util.HashMap;
import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import com.qzp.model.User;

@Controller
@RequestMapping("/user")
public class UserController {
	
    private Map<String, User> users = new HashMap<String, User>();
    public UserController() {
        users.put("sdy",new User(1, "sdy","123","宋冬野","sdy@qq.com"));
        users.put("ldh",new User(2,"ldh","123","刘德华","ldh@qq.com"));
        users.put("gfc",new User(3,"gfc","123","郭富城","gfc@qq.com"));
        users.put("lm",new User(4,"lm","123","黎明","lm@qq.com"));
        users.put("zxy",new User(5,"zxy","123","张学友","zxy@qq.com"));
    }
    
    //列表页面
    @RequestMapping(value=http://www.mamicode.com/"/users",method = RequestMethod.GET)>3.考虑到增加信息时，应该有一个服务器端验证，因而此处导入bean-validate.jar包，并修改user文件
package com.qzp.model;

import javax.validation.constraints.Size;
import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.NotEmpty;

public class User {
	
	private int id;
	private String username;
	private String password;
	private String nickname;
	private String email;
	public User() {
		super();
	}
	public User(int id, String username, String password, String nickname,
			String email) {
		super();
		this.id = id;
		this.username = username;
		this.password = password;
		this.nickname = nickname;
		this.email = email;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	
	@NotEmpty(message="用户名不能为空！")
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	
	@Size(min=1,max=10,message="密码大于1位小于10位！")
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	@Email(message="邮箱的格式不正确！")
	public String getEmail() {
		return email;
	}
	
	public void setEmail(String email) {
		this.email = email;
	}
	public String getNickname() {
		return nickname;
	}
	public void setNickname(String nickname) {
		this.nickname = nickname;
	}
}
4.视图层，首先list页面
jstl标签库要引入，下面是一个迭代标签，spring MVC没有自己的一套标签库，所以这边还是用的strust2的
users是一个map对象，所以要通过他的key来获取值。
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>用户列表</title>
  </head>
  
  <body>
    <a href=http://www.mamicode.com/"add">用户添加
> (显示用户名列表页面)执行结果如下：
5.接着是add页面
同样要导入spring的表单标签库，如果验证信息不通过，会提示信息
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="sf" uri="http://www.springframework.org/tags/form" %>
<html>
  <head>
    <title>增加页面</title>
  </head>
  
  <body>
   <!-- 此时没有写action -->
   <sf:form method="post" modelAttribute="user">
    username：<sf:input path="username"/><sf:errors path="username"/><br/>
    password：<sf:password path="password"/><sf:errors path="password"/><br/>
    nickname:<sf:input path="nickname"/><br/>
    email:<sf:input path="email"/><sf:errors path="email"/><br/>
    <input type="submit" value=http://www.mamicode.com/"添加用户"/>>
add页面的执行结果，添加成功的话，会跳转到user/list页面之中。


[4] spring mvc学习笔记


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