Spring MVC 数据验证——validate编码方式

2022-03-18 21:22:13

1、导入jar包

validation-api-1.0.0.GA.jar这是比較关键的一个jar包，主要用于解析注解@Valid.
hibernate-validator-4.3.2.Final.jar能够下载最新的。这个包在注解方式编码中尤为重要。
其它的就是一些日志包（不一定全不须要）：jboss-logging-3.1.3.GA.jar、slf4j-log4j12-1.6.1.jar

2、web项目的结构图

3、项目配置

web.xml配置

Spring mvc项目的最小配置

<?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" version="3.1">

  <display-name>SpringMVC</display-name>

  <welcome-file-list>

    <welcome-file>jsp/hello.jsp</welcome-file>

  </welcome-file-list>

  <servlet>

    <servlet-name>hello</servlet-name>

    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

    <load-on-startup>1</load-on-startup>

  </servlet>

  <servlet-mapping>

    <servlet-name>hello</servlet-name>

    <url-pattern>/</url-pattern>

  </servlet-mapping>

</web-app>

hello-servlet.xml配置

通过自己主动载入

<?

xml version="1.0" encoding="UTF-8"?

>

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:p="http://www.springframework.org/schema/p"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

     xmlns:aop="http://www.springframework.org/schema/aop"

    xmlns:context="http://www.springframework.org/schema/context"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd

    http://www.springframework.org/schema/mvc

    http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd

    http://www.springframework.org/schema/aop

    http://www.springframework.org/schema/aop/spring-aop-4.0.xsd

    http://www.springframework.org/schema/context

    http://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan

    base-package="controller">

    </context:component-scan>

     <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" /> 

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"

    p:prefix="/WEB-INF/jsp/" p:suffix=".jsp">

        <!-- <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property> -->

        </bean>

   <!--数据验证 编码方式的配置-->

   <mvc:annotation-driven validator="accountValidator"/>

   <bean id="accountValidator" class="dao.AccountValidator"></bean>

</beans>

4、src下加入源代码

controller包

RegisterController类主要有两个方法，一个用于get，还有一个用于post。当中数据验证是放在registerIF()方法中的。
验证是通过前两个參数。第一个參数是一个javabean保存的是注冊用户的信息，第二个參数用于数据验证提交过来的javabean对象。

package controller;

import javax.validation.Valid;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.validation.BindingResult;

import org.springframework.validation.DataBinder;

import org.springframework.web.bind.annotation.InitBinder;

import org.springframework.web.bind.annotation.ModelAttribute;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import dao.Account;

import dao.AccountValidator;

@Controller

@RequestMapping("/register")

public class RegisterController {

    @RequestMapping(method=RequestMethod.GET)

    public String register(Model model){

        if (!model.containsAttribute("account")) {

            model.addAttribute("account",new Account());

        }

        return "register";

    }

    @InitBinder

    public void initBinder(DataBinder binder){

        binder.setValidator(new AccountValidator());

    }

    @RequestMapping(method=RequestMethod.POST)

    public String registerIF(@Valid @ModelAttribute("account")Account account,BindingResult result,Model model){

        System.out.println("用户名："+account.getUsername());

        if (result.hasErrors()) {

            System.out.println("register faliure.");

            model.addAttribute("message", "注冊失败");

        }else {

            model.addAttribute("message", "注冊成功");

        }

        return "register";

    }

}

dao包

(1)、javabean类Account，用于保存注冊用户信息

package dao;

import javax.validation.constraints.Pattern;

import javax.validation.constraints.Size;

public class Account {

    private String username;

    private String password;

    public Account() {

        // TODO Auto-generated constructor stub

    }

    public Account(String username, String password) {

        super();

        this.username = username;

        this.password = password;

    }

    public String getUsername() {

        return username;

    }

    public void setUsername(String username) {

        this.username = username;

    }

    public String getPassword() {

        return password;

    }

    public void setPassword(String password) {

        this.password = password;

    }

}

（2）、 AccountValidator用于检验Account的输入用户信息

这个就是编码方式验证数据的主要类，通过hello-servlet.xml中的自己主动载入方式，将类载入进去，引入点就是在@Valid注解处。

package dao;

import org.springframework.validation.Errors;

import org.springframework.validation.ValidationUtils;

import org.springframework.validation.Validator;

public class AccountValidator implements Validator {

    @Override

    public boolean supports(Class<?> arg0) {

        // TODO Auto-generated method stub

        return Account.class.equals(arg0);

    }

    @Override

    //主要通过这种方法，验证数据

    public void validate(Object obj, Errors erros) {

        // TODO Auto-generated method stub

        ValidationUtils.rejectIfEmpty(erros, "username", null,"用户名不能为空.");

        ValidationUtils.rejectIfEmpty(erros, "password", null,"密码不能为空.");

        Account account = (Account) obj;

        if (account.getUsername().length()<3 || account.getUsername().length()>20) {

            erros.rejectValue("username","length","用户名长度在3-20个字符串之间");

        }

        if (account.getPassword().length()<6 || account.getPassword().length()>20) {

            erros.rejectValue("password","size","密码长度在6-20个字符之间");

        }

    }

}

5、加入jsp

在WEB-INF中新建一个jsp文件夹，然后新建一个register.jsp文件，加入例如以下代码：

<%@ 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">

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>注冊界面</title>

</head>

<body>

    <form:form method="post"  modelAttribute="account">

        <label for="username">用户名：</label>

        <form:input type="text" path="username"/>

        <form:errors path="username"/><br><br>

       <label for="pwd">密码：</label>&nbsp;

        <form:input type="password" path="password"/>

        <form:errors path="password"/>

        <br><br>

        <input type="submit" value="注冊" name="login"/>&nbsp;&nbsp;

    </form:form>

<br><hr>

${message}

</body>

</html>

6、效果演示

执行程序，然后在浏览器中输入地址：http://localhost:8080/annotation_springmvc/register

Spring MVC 数据验证——validate编码方式

Spring MVC 数据验证——validate编码方式

码农公寓

1、导入jar包

2、web项目的结构图

3、项目配置

4、src下加入源代码

5、加入jsp

6、效果演示

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