springboot拦截器过滤token,并返回结果及异常处理操作-eolink官网

springboot拦截器过滤token,并返回结果及异常处理操作

1.springboot 拦截器处理过滤token，并且返回结果

import org.apache.commons.lang3.StringUtils;

import org.apache.shiro.subject.Subject;

import org.springframework.lang.Nullable;

import org.springframework.stereotype.Component;

import org.springframework.web.servlet.HandlerInterceptor;

import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Map;

@Component

public class ECInterceptor implements HandlerInterceptor {

/**

* @Description 在业务处理器处理请求之前被调用。预处理，可以进行编码、安全控制等处理；

* @Date 2019/5/14 16:04

* @Version 1.0

@Override

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

System.out.println(request.getRequestURL()+"===========preHandle===========");

String token = request.getParameter("token");

if(StringUtils.isNotEmpty(token)){

Subject subject = ShiroUtil.getSubject(token);

if(subject != null && subject.isAuthenticated()){

return true;

} else{

//返回校验token结果

returnjson(response);

// return false; //我做的时候返回数据后忘记return false了，所以导致异常

}

return true;

}

@Override

public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {

System.out.println(request.getContextPath()+"============postHandle==========");

}

/**

* @Description 在DispatcherServlet完全处理完请求后被调用，也就是说视图渲染已经完毕或者调用者已经拿到结果

* @Date 2019/5/14 16:05

* @Version 1.0

@Override

public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {

System.out.println(request.getContextPath()+"============afterCompletion==========");

}

private void returnJson(HttpServletResponse response){

PrintWriter writer = null;

response.setCharacterEncoding("UTF-8");

response.setContentType("application/json; charset=utf-8");

try {

writer = response.getWriter();

Map result = PackageReturnResult.returnJson(400, "用户令牌token无效");

result.put("data", null);

writer.print(result);

} catch (IOException e){

LoggerUtil.logError(ECInterceptor.class, "拦截器输出流异常"+e);

} finally {

if(writer != null){

writer.close();

}

2.java.lang.IllegalStateException: getWriter() has already been called for this response异常

我再做拦截器处理response数据后忘记return false返回，导致拦截器被调用两次，报java.lang.IllegalStateException: getWriter() has already been called for this response异常，犯这样低级错误花了很长时间才解决，谨记！！！

[2019-05-27 09:27:17.690] [http-nio-8080-exec-1 ] [ERROR] [o.a.c.c.C.[.[.[.[dispatcherServlet] :175 ] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: getWriter() has already been called for this response] with root cause

java.lang.IllegalStateException: getWriter() has already been called for this response

at org.apache.catalina.connector.Response.getOutputStream(Response.java:548)

at org.apache.catalina.connector.ResponseFacade.getOutputStream(ResponseFacade.java:210)

at javax.servlet.ServletResponseWrapper.getOutputStream(ServletResponseWrapper.java:105)

at org.springframework.http.server.ServletServerHttpResponse.getBody(ServletServerHttpResponse.java:83)

at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:255)

at org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:103)

at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:290)

at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:180)

at com.uufund.ecapi.config.returnvalue.HandlerMethodReturnValueHandlerProxy.handleReturnValue(HandlerMethodReturnValueHandlerProxy.java:40)

at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82)

at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:119)

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892)

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797)

at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)

at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)

at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)

at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)

at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)

at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)

at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)

at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)

at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:387)

at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)

at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at com.uufund.ecapi.config.filter.ECWebFilter.doFilter(ECWebFilter.java:24)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)

at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)

at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)

at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)

at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:748)

补充知识：springboot 拦截器过滤权限和错误处理

先说异常处理，增加一个异常处理的类MyControllerAdvice就可以了，不需要其他地方使用，注意使用注解@ControllerAdvice

@ControllerAdvice

public class MyControllerAdvice {

@Resource

GetRootPath getRootPath;

private static final Logger logger = LoggerFactory.getLogger(MyControllerAdvice.class);

public void output(Object json, HttpServletRequest request, HttpServletResponse response) throws IOException {

String header = request.getHeader("Origin");

response.setContentType("application/json;charset=UTF-8;");

PrintWriter out = response.getWriter();

out.println(json);

out.flush();

out.close();

}

/***

* 404处理

* @param e

* @return

@ExceptionHandler(NoHandlerFoundException.class)

public void notFountHandler(HttpServletRequest request, HttpServletResponse response, Model model, NoHandlerFoundException e) throws IOException, JSONException {

JSONObject json = new JSONObject();

json.put("code", 500);

json.put("content", null);

json.put("msg", "未找到路径："+request.getServletPath());

output(json,request,response);

}

/**

* 运行时异常

* @param exception

* @return

@ExceptionHandler({RuntimeException.class})

@ResponseStatus(HttpStatus.OK)

public void processException(HttpServletRequest request, HttpServletResponse response, Model model, RuntimeException exception) throws JSONException, IOException {

JSONObject json = new JSONObject();

json.put("code", 500);

json.put("content", null);

json.put("msg", exception.getMessage());

output(json,request,response);

}

/**

* Excepiton异常

* @param exception

* @return

@ExceptionHandler({Exception.class})

@ResponseStatus(HttpStatus.OK)

public void processException(HttpServletRequest request, HttpServletResponse response, Model model, Exception exception) throws JSONException, IOException {

JSONObject json = new JSONObject();

json.put("code", 500);

json.put("content", null);

json.put("msg", exception.getMessage());

output(json,request,response);

}

再来权限验证的，接手的项目框架中只有验证是否登录的，没有验收权限的，增加一个类WebMvcConfig，注意使用注解@Configuration，不需要在其他地方引用即可起作用，并注意使用excludePathPatterns去掉不需要拦截的部分，否则会拦截掉静态资源。

@Configuration

public class WebMvcConfig implements WebMvcConfigurer {

/**

* 添加拦截器

@Override

public void addInterceptors(InterceptorRegistry registry) {

//静态资源不拦截

registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**").excludePathPatterns("/static/**");

}

增加拦截器类LoginInterceptor

public class LoginInterceptor extends HandlerInterceptorAdapter {

/**

* 检查是否已经登录

@Override

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

Object username = request.getSession().getAttribute(Constants.LOGIN_USER);

String servletPath = request.getServletPath();

String type = request.getHeader("X-Requested-With") == null ? "" : request.getHeader("X-Requested-With");

if (username != null) {

//检查页面访问的权限

if (!"XMLHttpRequest".equals(type)) {

int userId = Integer.valueOf(request.getSession().getAttribute(Constants.LOGIN_USERID).toString());

List moduleList = (List) request.getSession().getAttribute(Constants.USER_MODULE);

boolean chkResult = methodPermissionLimit(moduleList, servletPath);

if(!chkResult){

JSONObject outputMSg = new JSONObject();

outputMSg.put("code", 500);

outputMSg.put("content", "");

outputMSg.put("msg", "没有权限");

output(outputMSg, request, response);

return false;

}else{

return true;

}

} else {

//如果是json访问，则不做检查

return true;

}

} else {

//检查是否登录允许

if (methodLoginLimit(handler)) {

return true;

} else {

if ("XMLHttpRequest".equals(type)) {

JSONObject outputMSg = new JSONObject();

http:// outputMSg.put("code", 500);

outputMSg.put("content", "");

outputMSg.put("msg", "登录过期，请重新登陆");

output(outputMSg, request, response);

return false;

} else {

String redirectUrl = request.getContextPath() + "/login";

response.sendRedirect(redirectUrl);

return false;

}

public boolean methodLoginLimit(Object handler) {

HandlerMethod method = (HandlerMethod) handler;

//获取当前方法PermessionLimit

LoginLimit loginLimit = method.getMethodAnnotation(LoginLimit.class);

if (loginLimit == null) {

//获取控制器的PermessionLimit

loginLimit = method.getMethod().getDeclaringClass().getAnnotation(LoginLimit.class);

}

if (loginLimit != null && !loginLimit.limit()) {

return true;

} else {

return false;

}

/**

* 检查权限

* @param moduleList

* @param path

* @return

public boolean methodPermissionLimit(List moduleList, String path) {

boolean havePermission = moduleList.stream().anyMatch(f->f.getPath().toLowerCase().equals(path.toLowerCase()));

return havePermission;

}

public void output(Object json, HttpServletRequest request, HttpServletResponse response) throws IOException {

String header = request.getHeader("Origin");

response.setContentType("application/json;charset=UTF-8;");

PrintWriter out = response.getWriter();

out.println(json);

out.flush();

out.close();

}

这样的拦截器只对页面地址进行拦截，对ajax提交的数据不做处理，做普通项目的权限过滤是可以了。

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