1、匯入jar包

• 其他的就是一些日誌包（不一定全不需要）：jboss-logging-3.1.3.GA.jar、slf4j-log4j12-1.6.1.jar

2、web專案的結構圖

3、專案配置

• web.xml配置
  Spring mvc專案的最小配置

<?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
  通過自動載入

<?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>

   <!--資料驗證 編碼方式的配置-->
   <mvc:annotation-driven validator="accountValidator"/>
   <bean id="accountValidator" class="dao.AccountValidator"></bean>
</beans>

4、src下新增原始碼

• controller包
  RegisterController類主要有兩個方法，一個用於get，另一個用於post。其中資料驗證是放在registerIF()方法中的。驗證是通過前兩個引數，第一個引數是一個javabean儲存的是註冊使用者的資訊，第二個引數用於資料驗證提交過來的javabean物件。

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("使用者名稱："+account.getUsername());
        if (result.hasErrors()) {
            System.out.println("register faliure.");
            model.addAttribute("message", "註冊失敗");
        }else {
            model.addAttribute("message", "註冊成功");
        }

        return "register";
    }
}

• dao包
  (1)、javabean類Account，用於儲存註冊使用者資訊

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用於檢驗Account的輸入使用者資訊
這個就是編碼方式驗證資料的主要類，通過hello-servlet.xml中的自動載入方式，將類載入進去，引入點就是在@Valid註解處。

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
    //主要通過這個方法，驗證資料
    public void validate(Object obj, Errors erros) {
        // TODO Auto-generated method stub
        ValidationUtils.rejectIfEmpty(erros, "username", null,"使用者名稱不能為空.");
        ValidationUtils.rejectIfEmpty(erros, "password", null,"密碼不能為空.");
        Account account = (Account) obj;
        if (account.getUsername().length()<3 || account.getUsername().length()>20) {
            erros.rejectValue("username","length","使用者名稱長度在3-20個字串之間");
        }

        if (account.getPassword().length()<6 || account.getPassword().length()>20) {
            erros.rejectValue("password","size","密碼長度在6-20個字元之間");
        }
    }
}

5、加入jsp

在WEB-INF中新建一個jsp目錄，然後新建一個register.jsp檔案，新增如下程式碼：

<%@ 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>註冊介面</title>
</head>
<body>
    <form:form method="post"  modelAttribute="account">
        <label for="username">使用者名稱：</label>
        <form:input type="text" path="username"/>
        <form:errors path="username"/><br><br>

       <label for="pwd">密碼：</label>&nbsp;
        <form:input type="password" path="password"/>
        <form:errors path="password"/>
        <br><br>
        <input type="submit" value="註冊" name="login"/>&nbsp;&nbsp;
    </form:form>
<br><hr>
${message}
</body>
</html>

6、效果演示