shiro+mybatis+springmvc实例记录（二）——shiro支持ajax请求

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/fzuzhanghao1993/article/details/78417297

接上文，页面跳转显然不适合动静分离ajax交互的架构模式，因此就需要对框架进行改造优化，使得后台能够返回json数据给前端请求。

自定义拦截器

shiro对权限、用户信息的校验实在默认的拦截器中进行的，要改写数据返回方式，则需要重写拦截器。这里我们分别对authc,perms进行重写。
分别定义两个拦截器，并使用printWriter将json字符串写入response中。
LoginFilter

package com.testshiro.filter;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
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;

    //用户登录校验失败回调方法，也可以自己重写校验方法isAccessAllowed
    @Override
    protected boolean onAccessDenied(ServletRequest request,
            ServletResponse response) throws Exception {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;

        //设置编码格式，header的content-type也要设置，否则浏览器不会以utf8解析，还是乱码。设置application/json可以让js不需要eval即可使用对象
        httpServletResponse.setCharacterEncoding("UTF-8");
        httpServletResponse.setHeader("Content-type",
                "application/json;charset=UTF-8");
        PrintWriter out;
        try {
            out = httpServletResponse.getWriter();
            out.println("{\"code\":-1,\"msg\":\"未登录用户！\"}");
            out.flush();
            out.close();
        } catch (IOException e1) {
            log.info(e1.getMessage());
        }
        return false;
    }

    @Override
    protected boolean onLoginFailure(AuthenticationToken token,
            AuthenticationException e, ServletRequest request,
            ServletResponse response) {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;

        httpServletResponse.setCharacterEncoding("UTF-8");
        httpServletResponse.setHeader("Content-type",
                "application/json;charset=UTF-8");
        PrintWriter out;
        try {
            out = httpServletResponse.getWriter();
            out.println("{\"code\":-1,\"msg\":\"系统错误\"}");
            out.flush();
            out.close();
        } catch (IOException e1) {
            log.info(e1.getMessage());
        }
        return false;
    }

    @Override
    protected boolean onLoginSuccess(AuthenticationToken token,
            Subject subject, ServletRequest request, ServletResponse response)
            throws Exception {
        return super.onLoginSuccess(token, subject, request, response);
    }

    private final static Logger log =
    Logger.getLogger(LoginFilter.class);
}

PermsFilter

package com.testshiro.filter;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.web.filter.authz.PermissionsAuthorizationFilter;

public class PermsFilter extends PermissionsAuthorizationFilter {

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

    @Override
    protected boolean onAccessDenied(ServletRequest arg0, ServletResponse arg1)
            throws IOException {
        HttpServletRequest httpServletRequest = (HttpServletRequest) arg0;
        HttpServletResponse httpServletResponse = (HttpServletResponse) arg1;

        httpServletResponse.setCharacterEncoding("UTF-8");
        httpServletResponse.setHeader("Content-type",
                "application/json;charset=UTF-8");
        PrintWriter out;
        try {
            out = httpServletResponse.getWriter();
            out.println("{\"code\":-1,\"msg\":\"登录用户无权执行该操作！\"}");
            out.flush();
            out.close();
        } catch (IOException e1) {
            log.info(e1.getMessage());
        }
        return false;
    }
}

接下来在配置文件中配置自定义拦截器
spring-shiro.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:util="http://www.springframework.org/schema/util"  
    xsi:schemaLocation="http://www.springframework.org/schema/beans   
    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd   
    http://www.springframework.org/schema/tx   
    http://www.springframework.org/schema/tx/spring-tx-4.0.xsd  
    http://www.springframework.org/schema/context  
    http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/util
    http://www.springframework.org/schema/util/spring-util-4.0.xsd"
  >
     <!-- Shiro Filter 拦截器相关配置 -->  
    <bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean">  
        <!-- securityManager -->  
        <property name="securityManager" ref="securityManager" /> 
        <property name="loginUrl" value="/login.jsp" />  
        <property name="unauthorizedUrl" value="/403.jsp" />
        <property name="filters">
            <util:map>
                <entry key="authc" value-ref="loginFilter"/>
                <entry key="perms" value-ref="authoFilter"/>
            </util:map>
        </property>
        <!-- 过滤链定义 -->  
        <property name="filterChainDefinitions">  
            <value>  
                /data/sysaccount/login*=anon
                /data/sysaccount/**=authc,perms[sysAccount]
                /data/sysautho/**=authc,perms[sysAutho]
                /data/sysrole/**=authc,perms[sysRole]
             </value>  
        </property>  
    </bean>  
    <bean id="loginFilter" class="com.testshiro.filter.LoginFilter"/>
    <bean id="authoFilter" class="com.testshiro.filter.PermsFilter"/>
    <!-- securityManager -->
    <bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">  
        <property name="realm" ref="myRealm" />  
    </bean>  
    <!-- 自定义Realm实现 --> 
    <bean id="myRealm" class="com.testshiro.realm.CustomRealm" />  

    <bean id="lifecycleBeanPostProcessor" class="org.apache.shiro.spring.LifecycleBeanPostProcessor" />



</beans>  

启动服务器即可。

js页面部分代码

.ajax({
                url : xxxx,
                type : "GET",
                success : function(data) {
                    if("code" in data&&data.code==-1){
                        alert(data.msg);
                        return;
                    }
                }
            })
            ......

运行效果

未登录情况：

未授权，post请求情况

正常情况