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SpringBoot默认有自定义异常处理的体系，在做SpringBoot项目的时候，如果是抛出了运行时异常，springBoot并会对异常进行处理，返回如下异常信息：

{"timestamp": 1517294278132,"status": 500,"error": "Internal Server Error","exception": "com.lgy.common.exception.BusinessException","message": "[001]自定义的uncheck 异常！","path": "/validateExceptionTest"
}

追究其原因，发现SpirngBoot出现异常信息时候，会默认访问/error,springBoot种有BasicErrorController这个类来处理异常信息： 

 

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//
 
package org.springframework.boot.autoconfigure.web;import java.util.Collections;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.boot.autoconfigure.web.ErrorProperties.IncludeStacktrace;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.util.Assert;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;@Controller
@RequestMapping({"${server.error.path:${error.path:/error}}"})
public class BasicErrorController extends AbstractErrorController {private final ErrorProperties errorProperties;public BasicErrorController(ErrorAttributes errorAttributes, ErrorProperties errorProperties) {this(errorAttributes, errorProperties, Collections.emptyList());}public BasicErrorController(ErrorAttributes errorAttributes, ErrorProperties errorProperties, List<ErrorViewResolver> errorViewResolvers) {super(errorAttributes, errorViewResolvers);Assert.notNull(errorProperties, "ErrorProperties must not be null");this.errorProperties = errorProperties;}public String getErrorPath() {return this.errorProperties.getPath();}@RequestMapping(produces = {"text/html"})public ModelAndView errorHtml(HttpServletRequest request, HttpServletResponse response) {HttpStatus status = this.getStatus(request);Map<String, Object> model = Collections.unmodifiableMap(this.getErrorAttributes(request, this.isIncludeStackTrace(request, MediaType.TEXT_HTML)));response.setStatus(status.value());ModelAndView modelAndView = this.resolveErrorView(request, response, status, model);return modelAndView == null?new ModelAndView("error", model):modelAndView;}@RequestMapping@ResponseBodypublic ResponseEntity<Map<String, Object>> error(HttpServletRequest request) {Map<String, Object> body = this.getErrorAttributes(request, this.isIncludeStackTrace(request, MediaType.ALL));HttpStatus status = this.getStatus(request);return new ResponseEntity(body, status);}protected boolean isIncludeStackTrace(HttpServletRequest request, MediaType produces) {IncludeStacktrace include = this.getErrorProperties().getIncludeStacktrace();return include == IncludeStacktrace.ALWAYS?true:(include == IncludeStacktrace.ON_TRACE_PARAM?this.getTraceParameter(request):false);}protected ErrorProperties getErrorProperties() {return this.errorProperties;}
}

 

如果要取代SpringBoot默认的异常处理信息方式，继承ErrorController：

 

package com.lgy.controller;import com.alibaba.fastjson.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.web.BasicErrorController;
import org.springframework.boot.autoconfigure.web.ErrorAttributes;
import org.springframework.boot.autoconfigure.web.ErrorController;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.ServletRequestAttributes;import javax.servlet.http.HttpServletRequest;
import java.util.Map;/*** Created by fengch on 2018/1/30.*/
@Controller
@RequestMapping("${server.error.path:${error.path:/error}}")
public class FundaErrorController  implements ErrorController {private static final String PATH = "/error";@Autowiredprivate ErrorAttributes errorAttributes;@Overridepublic String getErrorPath() {return PATH;}@RequestMapping@ResponseBodypublic JSONObject doHandleError(HttpServletRequest request) {RequestAttributes requestAttributes = new ServletRequestAttributes(request);Map<String,Object> errorAttributesData = errorAttributes.getErrorAttributes(requestAttributes,true);Integer status=(Integer)errorAttributesData.get("status");  //状态码String path=(String)errorAttributesData.get("path");        //请求路径String messageFound=(String)errorAttributesData.get("message");   //异常信息
 JSONObject reData = new JSONObject();reData.put("status_", status);reData.put("path_", path);reData.put("message", messageFound);return reData;}
}

接着在访问，并是自定义处理的异常信息了：

{"message": "[001]自定义的uncheck 异常！","path_": "/validateExceptionTest","status_": 500
}

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