在默认的情况下,如果没有提供登陆的表单,Spring Security将会创建一个默认的登陆页面,请参考本页面:Spring Security 实现的一个Hello World例子。
在本次教程中,我们将会向你展示怎么创建一个自定义登陆的表单并用Spring Security做登陆验证。
需要说明的是:前面提到的Spring Security 实现的一个Hello World例子将会被再次使用,并用它支持表单验证。
本教程的开发环境为:
1.Spring 3.0.5.RELEASE
2.Spring Security 3.0.5.RELEASE
3.JSTL 1.2
1.工程目录:
本教程的最终项目结构如下所示:
2.Spring
Security
在你的Spring.xml进行如下配置:
1.login-page=”/login” – 登陆页面访问 “/login”
2.default-target-url=”/welcome” –如果认证成功则跳转到“/welcome”
3.authentication-failure-url=”/loginfailed” –如果认证失败则跳转到“/loginfailed”
4.logout-success-url=”/logout” – 我注销登陆则跳转到 “/logout”
spring-security.xml
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xsi:schemaLocation="http://www.springframework.org/schema/beans
< http auto-config = "true" >
< intercept-url pattern = "/welcome*" access = "ROLE_USER" />
< form-login login-page = "/login" default-target-url = "/welcome"
authentication-failure-url = "/loginfailed" />
< logout logout-success-url = "/logout" />
</ http >
< authentication-manager >
< authentication-provider >
< user-service >
< user name = "mkyong" password = "123456" authorities = "ROLE_USER" />
</ user-service >
</ authentication-provider >
</ authentication-manager >
</ beans:beans >
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3.Spring
Security控制器
Spring Security控制器用来处理请求到来时经过处理后跳转到相应的页面去。
LoginController.java
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package com.mkyong.common.controller;
import java.security.Principal;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
public class LoginController {
@RequestMapping (value= "/welcome" , method = RequestMethod.GET)
public String printWelcome(ModelMap model, Principal principal ) {
String name = principal.getName();
model.addAttribute( "username" , name);
model.addAttribute( "message" , "Spring Security Custom Form example" );
return "hello" ;
}
@RequestMapping (value= "/login" , method = RequestMethod.GET)
public String login(ModelMap model) {
return "login" ;
}
@RequestMapping (value= "/loginfailed" , method = RequestMethod.GET)
public String loginerror(ModelMap model) {
model.addAttribute( "error" , "true" );
return "login" ;
}
@RequestMapping (value= "/logout" , method = RequestMethod.GET)
public String logout(ModelMap model) {
return "login" ;
}
}
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4.错误信息
spring默认的错误信息不是很友善,我们可以在properties里面配置错误信息。
mymessages.properties
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AbstractUserDetailsAuthenticationProvider.badCredentials=Invalid username or password
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5.JSP页面
在用户登陆页面,你需要设置如下Spring
Security名称:
1.j_spring_security_check –登陆层
2.j_spring_security_logout –注销层
3.j_username – 用户名
4.j_password – 密码
为了展示认证的错误信息,用下面方式表达:
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${sessionScope[ "SPRING_SECURITY_LAST_EXCEPTION" ].message}
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login.jsp
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<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
< html >
< head >
< title >Login Page</ title >
< style >
.errorblock {
color: #ff0000;
background-color: #ffEEEE;
border: 3px solid #ff0000;
padding: 8px;
margin: 16px;
}
</ style >
</ head >
< body onload = ‘document.f.j_username.focus();‘ >
< h3 >Login with Username and Password (Custom Page)</ h3 >
< c:if test = "${not empty error}" >
< div class = "errorblock" >
Your login attempt was not successful, try again.< br /> Caused :
${sessionScope["SPRING_SECURITY_LAST_EXCEPTION"].message}
</ div >
</ c:if >
< form name = ‘f‘ action="<c:url value = ‘j_spring_security_check‘ />"
method=‘POST‘>
< table >
< tr >
< td >User:</ td >
< td >< input type = ‘text‘ name = ‘j_username‘ value = ‘‘ >
</ td >
</ tr >
< tr >
< td >Password:</ td >
< td >< input type = ‘password‘ name = ‘j_password‘ />
</ td >
</ tr >
< tr >
< td colspan = ‘2‘ >< input name = "submit" type = "submit"
value = "submit" />
</ td >
</ tr >
< tr >
< td colspan = ‘2‘ >< input name = "reset" type = "reset" />
</ td >
</ tr >
</ table >
</ form >
</ body >
</ html >
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hello.jsp
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<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
< html >
< body >
< h3 >Message : ${message}</ h3 >
< h3 >Username : ${username}</ h3 >
< a href = "<c:url value=" /j_spring_security_logout" />" > Logout</ a >
</ body >
</ html >
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6.例子
1.当访问“http://localhost:8080/SpringMVC/welcome”链接时,Spring Secutiry将会跳转到登陆页面:
http://localhost:8080/SpringMVC/login
2.如果用户名和密码输入错误则认证失败,页面将会展示错误信息:
3.如果用户名和密码输入正确则认证成功,则会展示请求页面:
http://localhost:8080/SpringMVC/welcome
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