原理

使用FormAuthenticationFilter过虑器实现 ，原理如下：

将用户没有认证时，请求loginurl进行认证，用户身份和用户密码提交数据到loginurl

FormAuthenticationFilter拦截住取出request中的username和password（两个参数名称是可以配置的）

FormAuthenticationFilter调用realm传入一个token（username和password）

realm认证时根据username查询用户信息（在Activeuser中存储，包括 userid、usercode、username、menus）。

如果查询不到，realm返回null，FormAuthenticationFilter向request域中填充一个参数（记录了异常信息）

登陆页面

由于FormAuthenticationFilter的用户身份和密码的input的默认值（username和password），修改页面的账号和密码 的input的名称为username和password

代码控制:(只对错误进行控制，认证过程由realm传递给Authenticator认证信息)

package cn.qlq.springmvc.controller;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

import org.apache.shiro.authc.IncorrectCredentialsException;

import org.apache.shiro.authc.UnknownAccountException;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

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

import cn.qlq.springmvc.Exception.MyException;

import cn.qlq.springmvc.pojo.ActiveUser;

import cn.qlq.springmvc.service.SysService;

@Controller

public class LoginController {

    @Autowired

    private SysService sysService;

    // 登陆提交地址，和applicationContext-shiro.xml中配置的loginurl一致

    @RequestMapping("/login.action")

    public String login(HttpServletRequest request) throws Exception {

        // 如果登陆失败从request中获取认证异常信息，shiroLoginFailure就是shiro异常类的全限定名

        String exceptionClassName = (String) request.getAttribute("shiroLoginFailure");

        // 根据shiro返回的异常类路径判断，抛出指定异常信息

        if (exceptionClassName != null) {

            if (UnknownAccountException.class.getName().equals(exceptionClassName)) {

                // 最终会抛给异常处理器

                throw new MyException("账号不存在");

            } else if (IncorrectCredentialsException.class.getName().equals(exceptionClassName)) {

                throw new MyException("用户名/密码错误");

            } else if ("randomCodeError".equals(exceptionClassName)) {

                throw new MyException("验证码错误 ");

            } else {

                throw new Exception("不是账户错误，也不是密码错误");// 最终在异常处理器生成未知错误

            }

        }

        // 此方法不处理登陆成功（认证成功），shiro认证成功会自动跳转到上一个请求路径

        // 登陆失败还到login页面

        return "login";

    }

}

认证过滤拦截器

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--------------------------------------------退出-------------------------------

使用LogoutFilter

不用我们去实现退出，只要去访问一个退出的url（该 url是可以不存在），由LogoutFilter拦截住，清除session。

在applicationContext-shiro.xml配置LogoutFilter：

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页面中:

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" 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