Spring mvc 数据验证

浏览数：15 / 时间：2015年06月08日

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>