The abnormal processing and error debugging skills of the AHC/Client frame

The abnormal processing and error debugging skills of the AHC/Client frame introduction: In the development of Java applications, using the AHC/Client framework is a common and powerful way to perform asynchronous HTTP request operations.However, even experienced developers may encounter errors that cannot be predicted or difficult to debug.Therefore, this article will introduce some techniques for abnormal processing and error debugging in the AHC/Client framework to help developers better write strong and reliable code. Division skills: 1. Use the TRY-CATCH code block: For any code segment that may be thrown out, it should be wrapped in the TRY-CATCH code block.Methods in the AHC/Client framework usually throw abnormalities, such as request timeout, connection errors, etc.Using Try-Catch blocks can capture these abnormalities and perform corresponding error handling logic, such as logging or returning error information. try { // Execute AHC/Client request operation } catch (Exception e) { // Treatment abnormalities logger.error ("Request abnormal:" + e.getMessage ()); } 2. Differentiated different types of abnormalities: many different types of abnormal types are defined in the AHC/Client framework, such as ResponSetimeoutexception, Connectionxception, etc.When capturing abnormalities, different processing logic can be written according to the specific abnormal type to deal with errors more accurately. try { // Execute AHC/Client request operation } catch (ResponseTimeoutException e) { // Time to process the request abnormality logger.error ("Request timeout:" + e.getMessage ()); } catch (ConnectException e) { // Treatment of connection abnormalities logger.error ("Connection error:" + e.getMessage ()); } catch (Exception e) { // Treatment of other abnormalities logger.error ("Request abnormal:" + e.getMessage ()); } Error debugging skills: 1. Print debugging information: When debugging the AHC/Client framework, you can use the log tool to print related debugging information to help the positioning problem.You can record detailed information such as the requested URL, parameter, and response status code, which helps analyze the problem. logger.debug ("Request URL:" + Request.geturl ()); logger.debug ("Request parameters:" + request.getparams ()); logger.debug ("Response status code:" + response.getstatuscode ()); 2. Set the appropriate log level: By setting the appropriate log level, you can control the log output of the AHC/Client framework.During the debugging, the log level can be set to debug to view more detailed debugging information.In the production environment, it is recommended to set the log level to INFO or Warn to avoid excessive log information. properties # Set the log level of AHC/Client log4j.logger.com.ning.http.client=DEBUG Summarize: Through reasonable processing abnormalities and effective debugging techniques, developers can better use the AHC/Client framework to develop Java applications.Abnormal processing techniques include using TRY-CATCH code blocks and different types of different abnormal types to make corresponding treatment for different abnormal conditions.Error debugging skills include printing information and setting appropriate logs to help developers position and solve problems.By mastering these techniques, developers can better write reliable and robust code.