SPRINGMVC Implementing Global Exception handling

• Configuring global exception Handling in SPRINGMVC

class= "Cn.znx.blog.exception.MyExceptionResolver" ></bean>

• Defining global Exception Handling classes: Handlerexceptionresolver interface required

 Packagecn.znx.blog.exception;ImportCom.google.gson.Gson;ImportOrg.springframework.web.bind.annotation.ResponseBody;ImportOrg.springframework.web.method.HandlerMethod;ImportOrg.springframework.web.servlet.HandlerExceptionResolver;ImportOrg.springframework.web.servlet.ModelAndView;Importjavax.servlet.http.HttpServletRequest;ImportJavax.servlet.http.HttpServletResponse;ImportJava.util.HashMap;ImportJava.util.Map; Public classMyexceptionresolverImplementsHandlerexceptionresolver { PublicModelandview resolveexception (httpservletrequest request, httpservletresponse response, Object handler, Exception Exception) {//Print error messageException.printstacktrace (); //Defining error MessagesString message = "The system is busy, please try again later!" "; if(Exceptioninstanceofmyexception) {Message=((myexception) exception). GetMessage (); }        //Determine request typeHandlermethod Handlermethod =(Handlermethod) handler; Responsebody Responsebody= Handlermethod.getmethod (). Getannotation (Responsebody.class); //if it is a JSON request, the JSON data is returned        if(responsebody!=NULL) {Map<String,Object> Responsemap =NewHashmap<string,object>(); Responsemap.put ("Code", "999999"); Responsemap.put ("Message", message); String JSON=NewGson (). ToJson (Responsemap); Response.setcharacterencoding ("UTF-8"); Response.setcontenttype ("Application/json;charset=utf-8"); Try{response.getwriter (). write (JSON);            Response.getwriter (). Flush (); } Catch(Exception e) {e.printstacktrace (); }            return NewModelandview (); }        //If the request is a jump page//Page ForwardingModelandview Modelandview =NewModelandview (); //upload error message to pageModelandview.addobject ("Message", message); //point to Error pageModelandview.setviewname ("Error"); returnModelandview; }}

• Custom exceptions

Package Cn.znx.blog.exception;import Com.google.gson.gson;import Org.springframework.web.bind.annotation.responsebody;import Org.springframework.web.method.handlermethod;import Org.springframework.web.servlet.handlerexceptionresolver;import Org.springframework.web.servlet.ModelAndView; Import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;import Java.util.hashmap;import Java.util.map;public class Myexceptionresolver implements Handlerexceptionresolver {public M                                         Odelandview resolveexception (httpservletrequest request, httpservletresponse response, Object handler,        Exception Exception) {//Print error message exception.printstacktrace (); Define error message String message = "The system is busy, please try again later!"        ";        If (Exception instanceof myexception) {message = ((myexception) exception). GetMessage ();        }//Judgment request type Handlermethod Handlermethod = (handlermethod) handler; Responsebody ResponseboDY = Handlermethod.getmethod (). Getannotation (Responsebody.class); If it is a JSON request, the JSON data is returned if (responsebody!=null) {map<string,object> Responsemap = new Hashmap<stri            Ng,object> ();            Responsemap.put ("Code", "999999");            Responsemap.put ("message", message);            String json = new Gson (). ToJson (Responsemap);            Response.setcharacterencoding ("UTF-8");            Response.setcontenttype ("Application/json;charset=utf-8");                try {response.getwriter (). write (JSON);            Response.getwriter (). Flush ();            } catch (Exception e) {e.printstacktrace ();        } return new Modelandview ();        }//If it is a jump page request//page forward Modelandview Modelandview = new Modelandview ();        Upload error message to page modelandview.addobject ("message", message);        Point to Error page Modelandview.setviewname ("error");    return modelandview; }}

• To define a JSON response class:

@Datapublic class Result {    //status code    private String code;    Error message    private String message;    or JSON    private hashmap<string,object> data = new hashmap<> ();    Logon failure public    static result error (String string) {        result result = new result ();        Result.setcode ("999999");        if (Stringutils.isempty (String)) {            result.setmessage ("Login Failed");        } else{            result.setmessage (string);        }        return result;    }    Add data public    Result Add (String key,object value) {        this.getdata (). put (key,value);        return this;    }    Login succeeded public    static result success () {        result result = new result ();        Result.setcode ("000000");        Result.setmessage ("Login Successful");        return result;    }    }

SPRINGMVC Implementing Global Exception handling