如何解决在 RequestMethod.GET 函数上获取 HttpMediaTypeNotAcceptableException
我在我的示例项目中使用的是 spring 4.3 版本。在那个函数中,返回一个模型 UserDetails。下面是控制器功能。
UserController.java
@RequestMapping(value="/userDetails/{name}/{userName}",method = RequestMethod.GET)
public @ResponseBody List<UserDetailsVO> getUserDetailsByname(@PathVariable String name,@PathVariable String userName) { // line number 2222222
List<UserDetailsVO> userDetailsVOs = null;
try{
userDetailsVOs = UserDetailsDAO.getUserDetailsBynameDAO(name,userName);
}
catch(Exception e){
log.error("Exception occured")
}
return UserDetailsVOs; // line number 1111111
}
UserDetailsDAO.java
@Transactional(propagation=Propagation.required)
@SuppressWarnings("unchecked")
@Override
public List<UserDetailsVO> getUserDetailsBynameDAO(String name,String userName) {
List<UserDetailsVO> recordList = new ArrayList<UserDetailsVO>();
String searchValue="%"+userName+"%";
try {
recordList = UserDetailsUtil.getUserRecords(getHibernateTemplate().getSessionFactory().getCurrentSession().createquery("from UserDetails spr where UPPER("+name+") like :searchValue").setString("searchValue",searchValue.toupperCase()).list());
} catch (Exception e) {
log.error("Exception occured")
}
return recordList;
}
在上面的控制器中,如果我将 userName 中的搜索字符串作为“dummy.xyz”传递,那么它将这个字符串作为“dummy”并从字符串中删除“.xyz”,这是可以的,因为路径变量删除了“。” char 和从 db 查询调试后,它返回用户名中有“虚拟”的对象,这是预期的行为,但在执行第 1111111 行后,它给出了以下错误。
错误日志
[2021-03-23][18:29:42][WARN]Failed to invoke @ExceptionHandler method: public com.test.project.service.exceptions.Errors com.test.project.service.UserController.handleException(java.lang.Exception,javax.servlet.http.HttpServletResponse)
org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:200)
at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:174)
at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:81)
at org.springframework.web.servlet.mvc.method.annotation.ServletinvocableHandlerMethod.invokeAndHandle(ServletinvocableHandlerMethod.java:113)
at org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver.doResolveHandlerMethodException(ExceptionHandlerExceptionResolver.java:385)
at org.springframework.web.servlet.handler.AbstractHandlerMethodExceptionResolver.doResolveException(AbstractHandlerMethodExceptionResolver.java:59)
at org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:132)
at org.springframework.web.servlet.dispatcherServlet.processHandlerException(dispatcherServlet.java:1222)
at org.springframework.web.servlet.dispatcherServlet.processdispatchResult(dispatcherServlet.java:1034)
at org.springframework.web.servlet.dispatcherServlet.dodispatch(dispatcherServlet.java:984)
at org.springframework.web.servlet.dispatcherServlet.doService(dispatcherServlet.java:901)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
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:52)
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:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:544)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:353)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:616)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:831)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1629)
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)
[2021-03-23][18:29:42][WARN]Resolved [org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation]
如果我将行号 2222222 改为 as
@RequestMapping(value="/userDetails/{name}",method = RequestMethod.GET)
public @ResponseBody List<UserDetailsVO> getUserDetailsByname(@PathVariable String name,@RequestParam(value = "value",required=false) String value) {
那么它工作得很好。
我不确定@PathVariable 和@RequestParam 有什么区别以改变响应。是的,@RequestParam 确实允许搜索条目为完整的“dummy.xyz”,而@PathVariable 只允许“dummy”,但为什么即使 db 返回正确的结果,@Pathvariable 也会给出上述错误。
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