spring MVC中基于hibernate validator的form表单验证

原创

生活在他方 2023-01-04 12:36:35 ©著作权

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首先，在pom.xml中添加hibernate.validator的支持

<!-- hibernate.validator -->
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-validator</artifactId>
      <version>4.3.1.Final</version>
    </dependency>

表单提交页面user_add.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
  pageEncoding="UTF-8"%>
<!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>add user</title>
</head>
<body>
  <form:form id="form" method="post"
    modelAttribute="validUserBean">
    添加用户
    <form:label path="account">账号：</form:label>
    <form:input path="account" />
    <form:errors path="account" />
    <form:label path="password">密码：</form:label>
    <form:input path="password" />
    <form:errors path="password" />
    <button type="submit">添加</button>
    <button type="reset">重置</button>
    <c:out value="${show}"></c:out>
  </form:form>
</body>
</html>

新建一个用于验证的Bean：ValidUserBean

package com.worldless.admin.controller;

import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.Length;
import org.hibernate.validator.constraints.NotEmpty;
import org.springframework.stereotype.Component;

@Component("ValidUserBean")
public class ValidUserBean {

  @NotEmpty
  @Email
  private String account;
  
  @NotEmpty
  @Length(min=6,max=16)
  private String password;

  public String getAccount() {
    return account;
  }

  public void setAccount(String account) {
    this.account = account;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }
}

来修改controller，

package com.worldless.admin.controller;

import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class AdminController {

  @Autowired
  private ValidUserBean validUserBean;

        //通过url访问新增页面
  @RequestMapping(value = "admin/add", method = RequestMethod.GET)
  public String userNew(Model model) {
    model.addAttribute("validUserBean", validUserBean);
    return "admin/user_add";
  }

        //点击按钮提交时
  @RequestMapping(value = "admin/add", method = RequestMethod.POST)
  public String userAdd(
      @ModelAttribute("validUserBean") @Valid ValidUserBean validUserBean,
      BindingResult result, Model model) {
    if (!result.hasErrors()) {
      model.addAttribute("show", "ok");
    }
    return "admin/user_add";
  }

}