# 解决无法直接返回401错误
Shiro + JWT + SpringBoot + MySQL + Redis(Jedis)实现无状态鉴权机制(Restful风格API)(解决无法直接返回401错误)
我的项目地址
- Github：https://github.com/wang926454/ShiroJwt (opens new window)
- Gitee(码云)：https://gitee.com/dolyw/ShiroJwt (opens new window)
# 实现代码
不再进行转发，直接 response，具体查看 JWTFilter.java
- 转发的代码段
/**
* 将非法请求跳转到 /401
*/
private void response401(ServletRequest req, ServletResponse resp) {
try {
HttpServletResponse httpServletResponse = (HttpServletResponse) resp;
httpServletResponse.sendRedirect("/401");
} catch (IOException e) {
LOGGER.error(e.getMessage());
}
}
- 直接返回的代码段
/**
* 无需转发，直接返回Response信息
*/
private void response401(ServletRequest req, ServletResponse resp, String msg) {
HttpServletResponse httpServletResponse = (HttpServletResponse) resp;
httpServletResponse.setStatus(401);
httpServletResponse.setCharacterEncoding("UTF-8");
httpServletResponse.setContentType("application/json; charset=utf-8");
PrintWriter out = null;
try {
out = httpServletResponse.getWriter();
String data = JsonConvertUtil.objectToJson(new ResponseBean(401, "无权访问(Unauthorized):" + msg, null));
out.append(data);
} catch (IOException e) {
logger.error(e.getMessage());
} finally {
if (out != null) {
out.close();
}
}
}
- JWTFilter.java
package com.wang.config.shiro;
import com.wang.model.common.ResponseBean;
import com.wang.util.common.JsonConvertUtil;
import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.RequestMethod;
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;
/**
* JWT过滤
* @author dolyw.com
* @date 2018/8/30 15:47
*/
public class JWTFilter extends BasicHttpAuthenticationFilter {
private Logger logger = LoggerFactory.getLogger(this.getClass());
/**
* 这里我们详细说明下为什么最终返回的都是true，即允许访问
* 例如我们提供一个地址 GET /article
* 登入用户和游客看到的内容是不同的
* 如果在这里返回了false，请求会被直接拦截，用户看不到任何东西
* 所以我们在这里返回true，Controller中可以通过 subject.isAuthenticated() 来判断用户是否登入
* 如果有些资源只有登入用户才能访问，我们只需要在方法上面加上 @RequiresAuthentication 注解即可
* 但是这样做有一个缺点，就是不能够对GET,POST等请求进行分别过滤鉴权(因为我们重写了官方的方法)，但实际上对应用影响不大
*/
@Override
protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
// 判断用户是否想要登入
if (this.isLoginAttempt(request, response)) {
try {
// 进行Shiro的登录UserRealm
this.executeLogin(request, response);
} catch (Exception e) {
// 出现异常直接返回Response信息
this.response401(request, response, e.getMessage());
return false;
}
}
return true;
}
/**
* 检测header里面是否包含Authorization字段，有就登录
*/
@Override
protected boolean isLoginAttempt(ServletRequest request, ServletResponse response) {
HttpServletRequest req = (HttpServletRequest) request;
String authorization = req.getHeader("Authorization");
return authorization != null;
}
/**
* 登录
*/
@Override
protected boolean executeLogin(ServletRequest request, ServletResponse response) throws Exception {
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
String authorization = httpServletRequest.getHeader("Authorization");
JWTToken token = new JWTToken(authorization);
// 提交给UserRealm进行登入，如果错误他会抛出异常并被捕获
this.getSubject(request, response).login(token);
// 如果没有抛出异常则代表登入成功，返回true
return true;
}
/**
* 无需转发，直接返回Response信息
*/
private void response401(ServletRequest req, ServletResponse resp, String msg) {
HttpServletResponse httpServletResponse = (HttpServletResponse) resp;
httpServletResponse.setStatus(401);
httpServletResponse.setCharacterEncoding("UTF-8");
httpServletResponse.setContentType("application/json; charset=utf-8");
PrintWriter out = null;
try {
out = httpServletResponse.getWriter();
String data = JsonConvertUtil.objectToJson(new ResponseBean(401, "无权访问(Unauthorized):" + msg, null));
out.append(data);
} catch (IOException e) {
logger.error(e.getMessage());
} finally {
if (out != null) {
out.close();
}
}
}
/**
* 对跨域提供支持
*/
@Override
protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
HttpServletResponse httpServletResponse = (HttpServletResponse) response;
httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
// 跨域时会首先发送一个OPTIONS请求，这里我们给OPTIONS请求直接返回正常状态
if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
httpServletResponse.setStatus(HttpStatus.OK.value());
return false;
}
return super.preHandle(request, response);
}
}
当前博客源码：https://download.csdn.net/download/wang926454/10726052 (opens new window)
我的项目地址
- Github：https://github.com/wang926454/ShiroJwt (opens new window)
- Gitee(码云)：https://gitee.com/dolyw/ShiroJwt (opens new window)
参考