Spring Boot QuickStart 8: Exception handling

Simple example of exception handling:

First step: Create a result entity class

 PackageCom.payease.domain;/*** The outermost object returned by the HTTP request * Created by liuxiaoming on 2017/11/7.*/ Public classResult<t> {    /**Error code*/    PrivateInteger Code; /**Prompt Information*/    PrivateString msg; /**Specific Content*/    PrivateT data;  PublicInteger GetCode () {returnCode; }     Public voidSetcode (Integer code) { This. Code =Code; }     PublicString getmsg () {returnmsg; }     Public voidsetmsg (String msg) { This. msg =msg; }     PublicT GetData () {returndata; }     Public voidsetData (T data) { This. data =data; }}

Step Two: Create the Resultutil tool class

 Packagecom.payease.utils;ImportCom.payease.domain.Result;/*** For results set (Result) tool class * Created by liuxiaoming on 2017/11/7.*/ Public classResultutil { Public Staticresult Success (Object object) {result result=NewResult (); Result.setcode (0); Result.setmsg (Success);        Result.setdata (object); returnresult; }     Public StaticResult Success () {returnSuccessNULL); }     Public Staticresult Error (Integer code,string msg) {result result=NewResult ();        Result.setcode (code);        Result.setmsg (msg); returnresult; }}

Step three: Call in controller

@AutowiredPrivategirlrespository girlrespository; /*** Create a girl*/@PostMapping ("/girls")     PublicResult<girl>Girladd (@Valid Girl Girl, Bindingresult bindingresult) {result result=NewResult (); if(Bindingresult.haserrors ()) {returnResultutil.error (1, Bindingresult.getfielderror (). Getdefaultmessage ());        } girl.setcupsize (Girl.getcupsize ());        Girl.setage (Girl.getage ()); returnresultutil.success (Girlrespository.save (girl)); }

Fourth step: Start the project to submit the request in Postman

Successful request:

Request failed:

Example: Unified exception Handling

First step: Create an enumeration class Resultenum(Unified management error code and error message)

 Packagecom.payease.enums;/*** Created by liuxiaoming on 2017/11/7.*/ Public enumresultenum {unknown_error (-1, "Unknown error"), SUCCESS (0, "Success"), Primary_school (100, "You may still be in primary school."), Middle_school (101, "You may be in junior high."),    ; PrivateInteger Code; PrivateString msg; Resultenum (Integer code, String msg) { This. Code =Code;  This. msg =msg; }     PublicInteger GetCode () {returnCode; }     Public voidSetcode (Integer code) { This. Code =Code; }     PublicString getmsg () {returnmsg; }     Public voidsetmsg (String msg) { This. msg =msg; }}

Step two: Create a Custom exception capture class Exceptionhandle

 PackageCom.payease.handle;ImportCom.payease.domain.Result;ImportCom.payease.enums.ResultEnum;Importcom.payease.exception.GirlException;ImportCom.payease.utils.ResultUtil;ImportOrg.slf4j.Logger;Importorg.slf4j.LoggerFactory;ImportOrg.springframework.web.bind.annotation.ControllerAdvice;ImportOrg.springframework.web.bind.annotation.ExceptionHandler;ImportOrg.springframework.web.bind.annotation.ResponseBody;/*** Custom Exception Capture class * Created by liuxiaoming on 2017/11/7.*/@ControllerAdvice Public classExceptionhandle {//Log    Private Final StaticLogger Logger = Loggerfactory.getlogger (exceptionhandle.class); @ExceptionHandler (Value= Exception.class) @ResponseBody PublicResult handle (Exception e) {if(Einstanceofgirlexception) {girlexception girlexception=(girlexception) e; returnResultutil.error (Girlexception.getcode (), Girlexception.getmessage ()); }Else{logger.info ("" System exception "{}", E); returnResultutil.error (ResultEnum.UNKNOWN_ERROR.getCode (), RESULTENUM.UNKNOWN_ERROR.GETMSG ()); //return Resultutil.error (-1, "Unknown Error:");        }    }}

Step three: Create a custom exception class

 Packagecom.payease.exception;ImportCom.payease.enums.ResultEnum;/*** Custom Exception * Created by liuxiaoming on 2017/11/7.*/ Public classGirlexceptionextendsruntimeexception{PrivateInteger Code;  Publicgirlexception (Resultenum resultenum) {Super(Resultenum.getmsg ());  This. Code =Resultenum.getcode (); }     PublicInteger GetCode () {returnCode; }     Public voidSetcode (Integer code) { This. Code =Code; }}

Fourth step: Add a method to the service

  Public voidGetage (Integer ID)throwsexception{Girl Girl=Girlrespository.findone (ID); Integer Age=Girl.getage (); if(Age < 10){            //back to "you're still in primary school," code=100.            Throw Newgirlexception (Resultenum.primary_school); }Else if(Age > Ten && Age < 16){            //back to "you may be in junior high" code=101            Throw Newgirlexception (Resultenum.middle_school); }        //If >16 years old, add Money//...}

Fifth Step: Call the method in the controller

    /**      * Determine if the age of the girl meets the     requirements by ID @param  ID     @throws  Exception      */     @GetMapping ("Girls/getage/{id}")    publicvoidthrows  exception{         girlservice.getage (ID);    }

Sixth step: Start the project postman submit

Spring Boot QuickStart 8: Exception handling