说明：

SpringBoot版本：2.3.3.RELEASE

采用，注解@ControllerAdvice方式和application.yml中配置的方式，全局统一处理@Controller、@RestController以及容器的异常；

代码：

package com.what21.demo.common;import lombok.Data;/** * 定义运行时异常处理 */@Datapublic class BusinessException extends RuntimeException {    private Integer code;    private String message;    public BusinessException(String message) {        super(message);    }    public BusinessException(String message, Throwable cause) {        super(message, cause);    }    public BusinessException(Throwable cause) {        super(cause);    }    /**     * @param code     * @param message     */    public BusinessException(Integer code, String message) {        super(code + ":" + message);        this.code = code;        this.message = message;    }}

package com.what21.demo.common;import lombok.*;import lombok.experimental.Accessors;import java.io.Serializable;@ToString@NoArgsConstructor@AllArgsConstructor@Accessors(chain = true)public class R<T> implements Serializable {    private static final long serialVersionUID = 1L;    public static final String OK = "SUCCESS";    public static final String ERROR = "ERROR";    @Getter    @Setter    private String code;    @Getter    @Setter    private String msg;    @Getter    @Setter    private T data;    public static <T> R<T> ok() {        return instance(OK, null, null);    }    public static <T> R<T> ok(T data) {        return instance(OK, null, data);    }    public static <T> R<T> ok(T data, String msg) {        return instance(OK, msg, data);    }    public static <T> R<T> okMsg(String msg) {        return instance(OK, msg, null);    }    public static <T> R<T> error() {        return instance(ERROR, null, null);    }    public static <T> R<T> error(T data) {        return instance(ERROR, null, data);    }    public static <T> R<T> error(T data, String msg) {        return instance(ERROR, msg, data);    }    public static <T> R<T> errMsg(String msg) {        return instance(ERROR, msg, null);    }    public static <T> R<T> instance(String code, String msg, T data) {        R<T> result = new R<>();        result.setCode(code);        result.setMsg(msg);        result.setData(data);        return result;    }}

package com.what21.demo.common;import lombok.extern.slf4j.Slf4j;import org.springframework.validation.BindException;import org.springframework.validation.ObjectError;import org.springframework.web.bind.MethodArgumentNotValidException;import org.springframework.web.bind.annotation.ControllerAdvice;import org.springframework.web.bind.annotation.ExceptionHandler;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.bind.annotation.RestControllerAdvice;import org.springframework.web.servlet.NoHandlerFoundException;import java.util.List;@ControllerAdvice// @RestControllerAdvice@Slf4jpublic class GlobalExceptionHandler {    /**     * 自定义异常处理     */    @ExceptionHandler(value = BusinessException.class)    @ResponseBody    public R businessExceptionHandler(BusinessException e) {        return R.instance(e.getCode() + "", e.getMessage(), "");    }    /**     * 异常处理     */    @ExceptionHandler(value = Exception.class)    @ResponseBody    public R exceptionHandler(Exception e) {        if (e instanceof NoHandlerFoundException) {            return R.instance("1001", e.getMessage(), "");        } else if (e instanceof IllegalArgumentException) {            return R.instance("1001", e.getMessage(), "");        } else if (e instanceof IllegalStateException) {            return R.instance("1001", e.getMessage(), "");        } else if (e instanceof BindException) {            BindException ex = (BindException) e;            List<ObjectError> allErrors = ex.getAllErrors();            ObjectError error = allErrors.get(0);            String defaultMessage = error.getDefaultMessage();            return R.instance("1001", defaultMessage, "");        } else if (e instanceof MethodArgumentNotValidException) {            MethodArgumentNotValidException ex = (MethodArgumentNotValidException) e;            List<ObjectError> errors = ex.getBindingResult().getAllErrors();            String message = errors.get(0).getDefaultMessage();            return R.instance("1001", message, "");        }        return R.instance("1001", e.getMessage(), "");    }}

配置（application.yml）：

spring:  #[自定义404]：出现错误时, 直接抛出异常  mvc:    throw-exception-if-no-handler-found: true  #[自定义404]：不映射工程中的资源文件  resources:    add-mappings: false

模拟错误：

import com.what21.demo.common.BusinessException;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.ResponseBody;@Controllerpublic class EchoController {    @GetMapping(value = "/")    public String index(Model model) {        model.addAttribute("index", "首页");        return "index";    }    @RequestMapping(path = "/echo", method = {RequestMethod.GET})    @ResponseBody    public String echo() {        if (true) {            throw new BusinessException(1002, "异常...........");        }        return "hello";    }}