shiro用ajax方式登录

用了shiro一段时间了，但是有点受不了它请求登录如果验证不通过直接跳的是loginUrl…所以我想很多人想用ajax实现shiro的登录直接在回调函数里面通过js显示出错信息吧。

今天查了一天的资料，结合了别人写的文章，自己也写了这个博客。好了，直接进入主题吧~

首先我们知道shiro主要是通过过滤器来实现权限的验证的，你可以继承各种各样的filter来进行扩展。这里我们实现ajax是通过继承FormAuthenticationFilter来的。下面这个类实现了如果是ajax请求则直接处理登录之后直接将信息通过response返回给客户端，如果是其它请求则直接用的源代码执行下去的，只是把源代码copy到重写的方法里面的而已。具体的可以看源码就会清楚的哦~如下：

package com.sh.ddyc.shiro.filter;

import com.sh.ddyc.constant.Constant;
import com.sh.ddyc.data.mapper.DUserMapper;
import com.sh.ddyc.dto.UserDto;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.web.filter.authc.FormAuthenticationFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

public class ExtendFormAuthenticationFilter extends FormAuthenticationFilter {

    private static final Logger log = LoggerFactory.getLogger(FormAuthenticationFilter.class);

    @Autowired
    DUserMapper userMapper;

    /**
     * 表示当访问拒绝时
     * @param request
     * @param response
     * @return
     * @throws Exception
     */
    @Override
    protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {

        if(this.isLoginRequest(request, response)) {
            if(this.isLoginSubmission(request, response)) {
                if(log.isTraceEnabled()) {
                    log.trace("Login submission detected.  Attempting to execute login.");
                }

                return this.executeLogin(request, response);
            } else {
                if(log.isTraceEnabled()) {
                    log.trace("Login page view.");
                }

                return true;
            }
        } else {
            if(log.isTraceEnabled()) {
                log.trace("Attempting to access a path which requires authentication.  Forwarding to the Authentication url [" + this.getLoginUrl() + "]");
            }

            this.saveRequestAndRedirectToLogin(request, response);
            return false;
        }
    }

    /**
     * 当登录成功
     * @param token
     * @param subject
     * @param request
     * @param response
     * @return
     * @throws Exception
     */
    @Override
    protected boolean onLoginSuccess(AuthenticationToken token, Subject subject, ServletRequest request, ServletResponse response) throws Exception {
        //将user对象放入session，这里你可能用不到，可以删除
        Map params = new HashMap();
        params.put("username",token.getPrincipal().toString());
        UserDto userDto = userMapper.findUserDto(params);
        //----------以上代码你可以删除-------------------
        ((HttpServletRequest)request).getSession().setAttribute(Constant.CURRENT_USER,userDto);

        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;

        if (!"XMLHttpRequest".equalsIgnoreCase(httpServletRequest
                .getHeader("X-Requested-With"))) {// 不是ajax请求
            issueSuccessRedirect(request, response);
        } else {
            httpServletResponse.setCharacterEncoding("UTF-8");
            PrintWriter out = httpServletResponse.getWriter();
            out.println("{\"success\":true,\"message\":\"登入成功\"}");
            out.flush();
            out.close();
        }
        return false;
    }

    /**
     * 当登录失败
     * @param token
     * @param e
     * @param request
     * @param response
     * @return
     */
    @Override
    protected boolean onLoginFailure(AuthenticationToken token, AuthenticationException e, ServletRequest request, ServletResponse response) {
        if (!"XMLHttpRequest".equalsIgnoreCase(((HttpServletRequest) request)
                .getHeader("X-Requested-With"))) {// 不是ajax请求
            setFailureAttribute(request, e);
            return true;
        }
        try {
            response.setCharacterEncoding("UTF-8");
            PrintWriter out = response.getWriter();
            String message = e.getClass().getSimpleName();
            if ("IncorrectCredentialsException".equals(message)) {
                out.println("{\"success\":false,\"message\":\"密码错误\"}");
            } else if ("UnknownAccountException".equals(message)) {
                out.println("{\"success\":false,\"message\":\"账号不存在\"}");
            } else if ("LockedAccountException".equals(message)) {
                out.println("{\"success\":false,\"message\":\"账号被锁定\"}");
            } else {
                out.println("{\"success\":false,\"message\":\"未知错误\"}");
            }
            out.flush();
            out.close();
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        return false;
    }
}

上面这个类的onAccessDenied()方法表示当访问拒绝时是否已经处理了；如果返回true表示需要继续处理；如果返回false表示该拦截器实例已经处理了，将直接返回即可。onLoginSuccess()方法是登录成功时调用。onLoginFailure()方法是登录失败时调用。
下面是onAccessDenied()方法里面的this.executeLogin(request, response);这行代码的源码：

可以看出这个方法执行了subject的login()方法登录然后如果登录成功则调用的onLoginSuccess(),如果报错则调用的onLoginFailure()。

好啦，关键的部分讲完了，接下来就是xml的配置了。
喽~

       <bean id="formAuthenticationFilter" class="com.sh.ddyc.shiro.filter.ExtendFormAuthenticationFilter">
              <property name="usernameParam" value="username"/>
              <property name="passwordParam" value="password"/>
              <property name="rememberMeParam" value="rememberMe"/>
              <property name="loginUrl" value="/login"/>
       bean>
       
       <bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean">
              <property name="securityManager" ref="securityManager"/>
              <property name="loginUrl" value="/login"/>
              <property name="successUrl" value="/index" />
              <property name="filters">
                     <util:map>
                            <entry key="authc" value-ref="formAuthenticationFilter"/>
                            <entry key="kickout" value-ref="kickoutSessionControlFilter"/>
                     util:map>
              property>
              <property name="filterChainDefinitions">
                     <value>
                            /login = authc
                            /index.jsp = anon
                            /*/register* = anon
                            /logout = logout
                            /static/** = anon
                            /assets/** = anon
                            /image/** = anon
                            /images/** = anon
                            /** = kickout,authc
                     value>
              property>
       bean>

接下来，你就可以直接在客户端用js请求login了~

这里的客户端js用ajax请求就自己写好了~
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