要求输出的异常信息格式为：
{
"result_code":10000,
"result_msg":"参数不符合要求",
"code":400
}
建公共异常信息类APIException，并继承RuntimeException，不是继承Exception
package com.example.demo.libs.exception;
import lombok.Data;
@Data
public classAPIExceptionextendsRuntimeException{
private intresult_code=500;
privateStringresult_msg="异常信息";
private intcode=500;
publicAPIException() {
}
publicAPIException(Exception_code exception_code) {
super(exception_code.getResult_msg());
this.result_code=exception_code.getResult_code();
this.result_msg=exception_code.getResult_msg();
this.code=exception_code.getCode();
}
@Override
public synchronized Throwable fillInStackTrace() {
return this;
}
}
建具体的异常信息枚举类（枚举对象一定要先放在前面）：
package com.example.demo.libs.exception;
public enum Exception_code{
SUCCESS(200,"成功！",200),
NOT_FOUND(404,"请求路径有误",404),
private int result_code;
private String result_msg;
private int code;
public int getResult_code() {
return result_code;
}
public String getResult_msg() {
return result_msg;
}
public int getCode() {
return code;
}
Exception_code(int result_code,String result_msg,int code) {
this.result_code=result_code;
this.result_msg=result_msg;
this.code=code;
}
}
建ExceptionBody类来规定reponse中的异常信息输出格式：
package com.example.demo.libs.exception;
import com.alibaba.fastjson.JSONObject;
import lombok.Data;
@Data
public class ExceptionBody{
private int result_code;
private String result_msg;
private int code;
public ExceptionBody(APIExceptionexception) {
this.result_code=exception.getResult_code();
this.result_msg=exception.getResult_msg();
this.code=exception.getCode();
}
public static ExceptionBody error(APIException exception) {
ExceptionBody e=new ExceptionBody(exception);
return e;
}
@Override
public String toString() {
return JSONObject.toJSONString(this);
}
}
建GlobalExceptionHandler类来捕捉抛出的异常，并统一处理返回到reponse：
package com.example.demo.libs.exception;
import org.slf4j.Logger;//注意是org.slf4j.Logger
import org.slf4j.LoggerFactory;////注意是org.slf4j.LoggerFactory
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller Advice
public class GlobalExceptionHandler{
private static final Loggerlogger=LoggerFactory.getLogger(GlobalExceptionHandler.class);
@ExceptionHandler(value=APIException.class)//捕捉异常
@ResponseBody //将信息写入Response
publicExceptionBodyexceptionHandler(APIExceptione){
logger.error("发生异常！原因是:",e.getResult_msg());
returnExceptionBody.error(e);
}
}
建controller类进行测试：
@RequestMapping(value="/add5",method=RequestMethod.GET)
public JSONObject add5(){
JSONObject result=new JSONObject();
int i=1;
if(i==1){
throw new APIException(Exception_code.NOT_FOUND);
}
return result;
}
