加入jar包
bean-validator.jar
在实体类中加入验证Annotation和消息提示
package com.stone.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 nickname;
private String password;
private String email;
public User(String username, String nickname, String password, String email) {
this.username = username;
this.nickname = nickname;
this.password = password;
this.email = email;
}
public User() {
super();
}
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;
}
public String getNickname() {
return nickname;
}
public void setNickname(String nickname) {
this.nickname = nickname;
}
@NotEmpty(message="密码不能为空")
@Size(min = 3, max = 10,message="密码长度必须大于3小于10")
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Email(message="邮件的格式为[email protected]")
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", nickname="
+ nickname + ", password=" + password + ", email=" + email
+ "]";
}
}
在Controller中加入@Valid和BindingResult处理验证结果
package com.stone.controller;
import java.util.HashMap;
import java.util.Map;
import javax.validation.Valid;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import com.stone.model.User;
@Controller
@RequestMapping("/user")
public class UserController {
private final static Map<String, User> users = new HashMap<String, User>();
public UserController() {
users.put("ldh", new User("ldh", "刘德华", "123", "[email protected]"));
users.put("zxy", new User("zxy", "张学友", "123", "[email protected]"));
users.put("gfc", new User("gfc", "郭富城", "123", "[email protected]"));
users.put("lm", new User("lm", "黎明", "123", "[email protected]"));
}
@RequestMapping("/users")
public String list(Model model) {
model.addAttribute("users", users);
return "user/list";
}
@RequestMapping(value = "/add", method = RequestMethod.GET)
public String add(Model model) {
model.addAttribute(new User());
return "user/add";
}
@RequestMapping(value = "/add", method = RequestMethod.POST)
public String add(@Valid User user, BindingResult bingding) {
if (bingding.hasErrors()) {
return "user/add";
}
users.put(user.getUsername(), user);
return InternalResourceViewResolver.REDIRECT_URL_PREFIX + "/user/users";
}
}
在jsp中加入验证提示消息
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@taglib prefix="sf" uri="http://www.springframework.org/tags/form"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP ‘add.jsp‘ starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>
<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" />
</sf:form>
</body>
</html>
时间： 2024-10-12 17:06:14