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abc.abc@abc.abc")

    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", "123@123.com"));

        users.put("zxy", new User("zxy", "张学友", "123", "123@123.com"));

        users.put("gfc", new User("gfc", "郭富城", "123", "123@123.com"));

        users.put("lm", new User("lm", "黎明", "123", "123@123.com"));

    }

    @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>

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