Spring MVC学习笔记——用户增删该查和服务器端验证

建立一个动态web项目，起名为SpringMVC_crud

导包，其中包括jstl的一些包等

1.先写一个User.java，是用户类

　　

　　文件User.java文件

package org.common.model;

import javax.validation.constraints.Size;

import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.NotEmpty;

public class User {
	private String username;
	private String password;
	private String email;
	private String nickname;

	public User() {
		super();
	}

	public User(String username, String password, String email, String nickname) {
		super();
		this.username = username;
		this.password = password;
		this.email = email;
		this.nickname = nickname;
	}

	@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="密码长度应该在1和10之间")
	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;
	}

}

2.再创建Controller控制器

　　

　　文件UserController.java

add的时候有两种，第一种

	//链接到add页面时候是GET请求，会访问这段代码
	@RequestMapping(value="/add",method=RequestMethod.GET)
	//把一个对象放到了@ModelAttribute中，Model的Key就是user
	public String add(Model model){
		//开启modeDrive
		model.addAttribute(new User());
		return "user/add";
	}

 第二种

	//链接到add页面时候是GET请求，会访问这段代码
	@RequestMapping(value="/add",method=RequestMethod.GET)
	//把一个对象放到了@ModelAttribute中，Model的Key就是user
	public String add(@ModelAttribute("user") User user){
		//开启modeDrive
		//model.addAttribute(new User());
		return "user/add";
	}

package org.common.controller;

import java.util.HashMap;
import java.util.Map;

import org.common.model.User;
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.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/user")
public class UserController {
	private Map<String,User> users = new HashMap<String,User>();　　//创建一个users对象

	public UserController() {
		users.put("ldh",new User("ldh","刘德华","123","123123"));
		users.put("zxy",new User("zxy","张学友","123","123123"));
		users.put("gfc",new User("gfc","郭富城","123","123123"));
		users.put("lm",new User("lm","黎明","123","123123"));
	}

	@RequestMapping(value="/users",method=RequestMethod.GET)
	public String list(Model model){
		model.addAttribute("users", users);
		return "user/list";
	}

	//链接到add页面时候是GET请求，会访问这段代码
	@RequestMapping(value="/add",method=RequestMethod.GET)
	//把一个对象放到了@ModelAttribute中，Model的Key就是user
	public String add(@ModelAttribute("user") User user){
		//开启modeDrive
		//model.addAttribute(new User());
		return "user/add";
	}

	//在具体添加用户的时候，是POST请求，就访问以下代码
	@RequestMapping(value="/add",method=RequestMethod.POST)
	public String add(@Validated User user,BindingResult br){//一定要紧跟@Validated之后写验证结果类
		if(br.hasErrors()){
			//如果有错误，直接跳转到add视图
			return "user/add";
		}
		users.put(user.getUsername(),user);
		return "redirect:/user/users";
	}

//	//链接到add页面时候是GET请求，会访问这段代码
//	@RequestMapping(value="/add",method=RequestMethod.GET)
//	public String add(Model model){
//		//开启modeDrive
//		model.addAttribute(new User());
//		return "user/add";
//	}
//
//	//在具体添加用户的时候，是POST请求，就访问以下代码
//	@RequestMapping(value="/add",method=RequestMethod.POST)
//	public String add(User user){
//		users.put(user.getUsername(),user);
//		return "redirect:/user/users";
//	}

}

 jsp/user/add.jsp

http://localhost:8080/springmvc_crud/user/add

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="sf" 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>Insert title here</title>
</head>
<body>
	<sf:form method="post" modelAttribute="user">
		<table width="700" align="center" border="1">
			<tr>
				<td>用户名:</td><td><sf:input path="username"/><sf:errors path="username"/></td>
			</tr>
			<tr>
				<td>用户密码:</td><td><sf:password path="password"/><sf:errors path="password"/></td>
			</tr>
			<tr>
				<td>用户昵称:</td><td><sf:input path="nickname"/></td>
			</tr>
			<tr>
				<td>用户邮箱:</td><td><sf:input path="email"/><sf:errors path="email"/></td>
			</tr>
			<tr>
			<td colspan="2">
				<input type="submit" value="用户添加"/>
			</td>
			</tr>
		</table>
	</sf:form>

</body>
</html>

 jsp/user/list.jsp

http://localhost:8080/springmvc_crud/user/users

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!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>用户列表</title>
</head>
<body>
	<c:forEach items="${users}" var="um">
		${um.value.username}
		----${um.value.nickname}
		----${um.value.password}
		----${um.value.email}<br/>
	</c:forEach>
</body>
</html>

 

user-servlet.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">

    <!-- 使用defaultAnnotationHandleMapping -->
    <context:component-scan base-package="org.common.controller"></context:component-scan>
	<mvc:annotation-driven></mvc:annotation-driven>
    <!-- InternalResourceViewResolver视图的映射关系，还有其他很多视图 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

</beans>

 web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
	<!-- 配置DispatchServlet，截获特定的URL请求 -->
    <!-- 默认自动加载/WEB-INF/simpleSpringMVC-servlet.xml -->
    <!-- （即<servlet-name>-servlet.xml）的Spring配置文件，启动web层的Spring容器 -->
  <servlet>
        <servlet-name>user</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>user</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- 设置字符编码 -->
    <filter>
		<filter-name>CharacterFilter</filter-name>
		<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>CharacterFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

</web-app>