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>
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