shiro-web集成
Web集成
大多数情况，web项目都会集成spring。shiro在普通web项目和spring项目中的配置是不一样的。
本次介绍普通的web项目，不使用任何框架。
shiro配置文件（shiro.ini）
创建web项目，然后在src下创建shiro.ini
[main] #默认的登录界面是/login.jsp authc.loginUrl=/login.jsp roles.unauthorizedUrl=/unauthorized perms.unauthorizedUrl=/unauthorized authcBasic.applicationName=please login [users] zhang=123,admin wang=123 [roles] admin=user:*,menu:* [urls] /login=anon /success=authc /unauthorized=anon /static/**=anon /authenticated=authc /role=authc,roles[admin] /permission=authc,perms["user:create"]
这里需要关注的有几个：
- authc.loginUrl=/login.jsp
- /login=anon
- /success=authc
当访问/success这个路径的时候，如果没有登录，将会自动跳转到登录界面/login.jsp，访问/login这个路径的时候，可以不用登录
界面
准备登录界面和登录成功的界面
登录界面
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>请登录</title>
</head>
<body>
<h1>login</h1>
<form action="login">
<label>username:</label>
<input type="text" name="username"/>
<label>password:</label>
<input type="text" name="password"/>
<input type="submit" value="submit"/>
</form>
</body>
</html>登录成功界面
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>登录成功</title>
</head>
<body>
<h1>SUCCESSFUL</h1>
</body>
</html>web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>shiro-web</display-name>
<!-- 该配置的作用是让shiro在项目启动的时候随之启动 -->
<listener>
<listener-class>org.apache.shiro.web.env.EnvironmentLoaderListener</listener-class>
</listener>
<!-- 配置shiro配置文件的位置，默认位置是/WEB-INF/shiro.ini -->
<context-param>
<param-name>shiroConfigLocations</param-name>
<param-value>classpath:shiro.ini</param-value>
</context-param>
<!-- shiro过滤器 -->
<filter>
<filter-name>ShiroFilter</filter-name>
<filter-class>org.apache.shiro.web.servlet.ShiroFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>ShiroFilter</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
<dispatcher>FORWARD</dispatcher>
<dispatcher>INCLUDE</dispatcher>
<dispatcher>ERROR</dispatcher>
</filter-mapping>
</web-app>Servlet
LoginServlet：处理登录请求的servlet，如果登录成功，重定向到/success
package com.shiro.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.IncorrectCredentialsException;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.Subject;
/**
* Servlet implementation class LoginServlet
*/
@WebServlet(name="/LoginServlet",urlPatterns="/login")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
Subject currentUser = SecurityUtils.getSubject();
UsernamePasswordToken token = new UsernamePasswordToken(username,password);
try {
currentUser.login(token);
} catch (UnknownAccountException e) {
System.out.println("沒有這個用戶");
} catch (IncorrectCredentialsException e) {
System.out.println("密碼錯誤");
} catch (AuthenticationException e) {
//其他错误，比如锁定，如果想单独处理请单独 catch 处理
System.out.println("其他错误：" + e.getMessage());
}
response.sendRedirect(request.getContextPath()+"/success");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}SuccessServlet：登录成功界面对应Servlet，只起到转发的作用
package com.shiro.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class SuccessServlet
*/
@WebServlet(name="/SuccessServlet",urlPatterns="/success")
public class SuccessServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.getRequestDispatcher("/WEB-INF/views/success.jsp").forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
} 
做到这里，基本的web集成就已经完成，但是在实际开发中，我们通常需要配置Realm等其他组件，从数据库中读取用户信息，用户的角色，权限等