springboot统一restful返回值及统一异常处理

统一返回restful数据：

首先确定需要返回的json数据的格式，定义一个统一返回类

package com.unicom.microservice.peixun.peixun_matb3.Response;

import com.unicom.microservice.peixun.peixun_matb3.enums.UnicomResponseEnums;

/**

• @program: 测试

• @description:返回的JSON数据结构标准

• @author: mtb

• @create: 2018-10-17 09:01

**/

public class ResponseBean <T>{

private boolean success;

private T data;

private String errCode;

private String errMsg;

public ResponseBean(){}

public ResponseBean(boolean success, T data) {

super();

this.success = success;

this.data = data;

}

@Override

public String toString() {

return "ResponseBean{" +

"success=" + success +

", data=" + data +

", errCode='" + errCode + '\'' +

", errMsg='" + errMsg + '\'' +

'}';

}

public ResponseBean(boolean success, T data, String errCode, String errMsg) {

super();

this.success = success;

this.data = data;

this.errCode = errCode;

this.errMsg = errMsg;

}

public ResponseBean(boolean success, String errCode, String errMsg) {

this.success = success;

this.errCode = errCode;

this.errMsg = errMsg;

}

public ResponseBean(boolean success,UnicomResponseEnums enums){

this.success=success;

this.errCode=enums.getCode();

this.errMsg=enums.getMsg();

}

public ResponseBean(boolean success,T data,UnicomResponseEnums enums){

this.success=success;

this.data=data;

this.errCode=enums.getCode();

this.errMsg=enums.getMsg();

}

public boolean isSuccess() {

return success;

}

public void setSuccess(boolean success) {

this.success = success;

}

public T getData() {

return data;

}

public void setData(T data) {

this.data = data;

}

public String getErrCode() {

return errCode;

}

public void setErrCode(String errCode) {

this.errCode = errCode;

}

public String getErrMsg() {

return errMsg;

}

public void setErrMsg(String errMsg) {

this.errMsg = errMsg;

}

}

新建一个枚举类，将常用提示信息及错误信息写入：

package com.unicom.microservice.peixun.peixun_matb3.enums;

/**

• @program: 测试

• @description:友好提示枚举

• @author: mtb

• @create: 2018-10-17 08:52

**/

public enum UnicomResponseEnums {

SYSTEM_ERROR("-001","系统异常"),

BAD_REQUEST("-002","错误的请求参数"),

NOT_FOUND("-003","找不到请求路径！"),

CONNECTION_ERROR("-004","网络连接请求失败！"),

METHOD_NOT_ALLOWED("-005","不合法的请求方式"),

DATABASE_ERROR("-004","数据库异常"),

BOUND_STATEMENT_NOT_FOUNT("-006","找不到方法！"),

REPEAT_REGISTER("001","重复注册"),

NO_USER_EXIST("002","用户不存在"),

INVALID_PASSWORD("003","密码错误"),

NO_PERMISSION("004","非法请求！"),

SUCCESS_OPTION("005","操作成功！"),

NOT_MATCH("-007","用户名和密码不匹配"),

FAIL_GETDATA("-008","获取信息失败"),

BAD_REQUEST_TYPE("-009","错误的请求类型"),

INVALID_MOBILE("010","无效的手机号码"),

INVALID_EMAIL("011","无效的邮箱"),

INVALID_GENDER("012","无效的性别"),

REPEAT_MOBILE("014","已存在此手机号"),

REPEAT_EMAIL("015","已存在此邮箱地址"),

NO_RECORD("016","没有查到相关记录"),

LOGIN_SUCCESS("017","登陆成功"),

LOGOUT_SUCCESS("018","已退出登录"),

SENDEMAIL_SUCCESS("019","邮件已发送，请注意查收"),

EDITPWD_SUCCESS("020","修改密码成功"),

No_FileSELECT("021","未选择文件"),

FILEUPLOAD_SUCCESS("022","上传成功"),

NOLOGIN("023","未登陆"),

ILLEGAL_ARGUMENT("024","参数不合法"),

ERROR_IDCODE("025","验证码不正确");

private String code;

private String msg;

private UnicomResponseEnums(String code, String msg) {

this.code = code;

this.msg = msg;

}

public String getCode() {

return code;

}

public void setCode(String code) {

this.code = code;

}

public String getMsg() {

return msg;

}

public void setMsg(String msg) {

this.msg = msg;

}

}

建立一个自定义异常继承 RuntimeException类，以便抛出自定义异常

package com.unicom.microservice.peixun.peixun_matb3.exception;

import com.unicom.microservice.peixun.peixun_matb3.enums.UnicomResponseEnums;

/**

• @program: 测试

• @description:自定义异常

• @author: mtb

• @create: 2018-10-17 08:57

**/

public class UnicomRuntimeException extends RuntimeException {

private static final long serialVersionUID = 1L;

protected String code;

protected String msg;

protected String message;//打印出的日志信息

public UnicomRuntimeException(UnicomResponseEnums enums, String message) {

super();

this.code = enums.getCode();

this.msg = enums.getMsg();

this.message = message;

}

public UnicomRuntimeException(UnicomResponseEnums enums) {

super();

this.code = enums.getCode();

this.msg = enums.getMsg();

}

public String getCode() {

return code;

}

public void setCode(String code) {

this.code = code;

}

public String getMsg() {

return msg;

}

public void setMsg(String msg) {

this.msg = msg;

}

public String getMessage() {

return message;

}

public void setMessage(String message) {

this.message = message;

}

public UnicomRuntimeException() {

super();

}

public UnicomRuntimeException(String message, Throwable cause) {

super(message, cause);

}

public UnicomRuntimeException(String message) {

super(message);

}

}

新建一个异常处理类：

package com.unicom.microservice.peixun.peixun_matb3.exception;

import javax.servlet.http.HttpServletRequest;

import com.unicom.microservice.peixun.peixun_matb3.Response.ResponseBean;

import com.unicom.microservice.peixun.peixun_matb3.enums.UnicomResponseEnums;

import org.apache.ibatis.binding.BindingException;

import org.omg.CosNaming.NamingContextPackage.NotFound;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.dao.DataAccessException;

import org.springframework.http.HttpStatus;

import org.springframework.stereotype.Controller;

import org.springframework.validation.BindException;

import org.springframework.web.bind.annotation.*;

import org.springframework.web.servlet.NoHandlerFoundException;

import java.net.ConnectException;

import java.sql.SQLException;

/**

• @program: 测试

• @description:全局的异常处理类

• @author: mtb

• @create: 2018-10-19 11:38

**/

@RestControllerAdvice(annotations={RestController.class,Controller.class})

public class SpringExceptionHandle {

private static final Logger logger = LoggerFactory.getLogger(SpringExceptionHandle.class);

/**

• 请求参数类型错误异常的捕获

• @param e

• @return

*/

@ExceptionHandler(value={BindException.class})

@ResponseBody

@ResponseStatus(value=HttpStatus.BAD_REQUEST)

public ResponseBean<String> badRequest(BindException e){

logger.error("occurs error when execute method ,message {}",e.getMessage());

return new ResponseBean<>(false, UnicomResponseEnums.BAD_REQUEST);

}

/**

• 404错误异常的捕获

• @param e

• @return

*/

@ExceptionHandler(value={NoHandlerFoundException.class})

@ResponseBody

@ResponseStatus(value=HttpStatus.NOT_FOUND)

public ResponseBean<String> badRequestNotFound(BindException e){

logger.error("occurs error when execute method ,message {}",e.getMessage());

return new ResponseBean<>(false,null, UnicomResponseEnums.NOT_FOUND);

}

/**

• mybatis未绑定异常

• @param e

• @return

*/

@ExceptionHandler(BindingException.class)

@ResponseBody

@ResponseStatus(value=HttpStatus.INTERNAL_SERVER_ERROR)

public ResponseBean<String> mybatis(Exception e){

logger.error("occurs error when execute method ,message {}",e.getMessage());

return new ResponseBean<>(false,UnicomResponseEnums.BOUND_STATEMENT_NOT_FOUNT);

}

/**

• 自定义异常的捕获

• 自定义抛出异常。统一的在这里捕获返回JSON格式的友好提示。

• @param exception

• @param request

• @return

*/

@ExceptionHandler(value={UnicomRuntimeException.class})

@ResponseBody

@ResponseStatus(value=HttpStatus.INTERNAL_SERVER_ERROR)

public <T> ResponseBean<T> sendError(UnicomRuntimeException exception,HttpServletRequest request){

String requestURI = request.getRequestURI();

logger.error("occurs error when execute url ={} ,message {}",requestURI,exception.getMsg());

return new ResponseBean<>(false,exception.getCode(),exception.getMsg());

}

/**

• 数据库操作出现异常

• @param e

• @return

*/

@ExceptionHandler(value={SQLException.class,DataAccessException.class})

@ResponseBody

@ResponseStatus(value=HttpStatus.INTERNAL_SERVER_ERROR)

public ResponseBean<String> systemError(Exception e){

logger.error("occurs error when execute method ,message {}",e.getMessage());

return new ResponseBean<>(false, UnicomResponseEnums.DATABASE_ERROR);

}

/**

• 网络连接失败！

• @param e

• @return

*/

@ExceptionHandler(value={ConnectException.class})

@ResponseBody

@ResponseStatus(value=HttpStatus.INTERNAL_SERVER_ERROR)

public ResponseBean<String> connect(Exception e){

logger.error("occurs error when execute method ,message {}",e.getMessage());

return new ResponseBean<>(false, UnicomResponseEnums.CONNECTION_ERROR);

}

@ExceptionHandler(value={Exception.class})

@ResponseBody

@ResponseStatus(value=HttpStatus.METHOD_NOT_ALLOWED)

public ResponseBean<String> notAllowed(Exception e){

logger.error("occurs error when execute method ,message {}",e.getMessage());

return new ResponseBean<>(false, UnicomResponseEnums.METHOD_NOT_ALLOWED);

}

}

建立一个测试controller类：

package com.unicom.microservice.peixun.peixun_matb3.web;/**

• Created by matengbing on 2018/10/15.

*/

import com.unicom.microservice.peixun.peixun_matb3.Response.ResponseBean;

import com.unicom.microservice.peixun.peixun_matb3.enums.UnicomResponseEnums;

import io.swagger.annotations.Api;

import io.swagger.annotations.ApiOperation;

import org.springframework.web.bind.annotation.*;

import springfox.documentation.annotations.ApiIgnore;

import java.util.HashMap;

import java.util.Map;

import java.util.Objects;

import java.util.StringJoiner;

/**

• @program: 测试

• @description:测试接口

• @author: mtb

• @create: 2018-10-15 11:26

**/

@RestController

@ApiIgnore

//@RequestMapping(value = "sayHello")

public class HelloController {

@CrossOrigin

@ApiOperation(value = "hello")

@RequestMapping(value = "/hello",method = RequestMethod.GET)

public ResponseBean<UnicomResponseEnums> sayHello(){

ResponseBean responseBean=new ResponseBean(true,UnicomResponseEnums.SUCCESS_OPTION);

return responseBean;

}

}

使用postman测试接口：

注意要配置springboot启动类，扫描controller等注解类被扫描到

@API等注解是swagger的注解，如果没有使用到可以删除

我们在实现数据库操作的方法中try，catch，捕捉到异常后，抛出一个自定义异常

@Transactional

@Override

public int addUser(User user) {

try {

user.setUserpwd(DigestUtils.md5DigestAsHex(user.getUserpwd().getBytes()));

userMapper.insertUser(user);

return user.getId();

}catch (Exception e){

throw new UnicomRuntimeException(UnicomResponseEnums.FAIL_INSERTUSER);

}

}

接着拦截404错误

package com.unicom.peixun.web;

import com.unicom.peixun.Response.ResponseBean;

import com.unicom.peixun.enums.UnicomResponseEnums;

import org.springframework.boot.autoconfigure.web.ErrorController;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;

/**

• @program: peixun_matb3

• @description:

• @author: matengbing

• @create: 2018-10-20 09:08

**/

@RestController

public class MyBasicErrorController implements ErrorController {

private static final String ERROR_PATH="/error";

@RequestMapping("/error")

public ResponseBean<Object> handleError(HttpServletRequest request){

//获取statusCode:401,404,500

Integer statusCode = (Integer) request.getAttribute("javax.servlet.error.status_code");

if(statusCode==404){

return new ResponseBean<>(false,null,UnicomResponseEnums.NOT_FOUND);

}else {

return new ResponseBean<>(false,null,UnicomResponseEnums.METHOD_NOT_ALLOWED);

}

}

@Override

public String getErrorPath() {

return ERROR_PATH;

}

}

用于登录拦截的拦截器实现返回restful数据：

package com.unicom.peixun.inteceptor;

import com.alibaba.fastjson.JSON;

import com.unicom.peixun.Response.ResponseBean;

import com.unicom.peixun.domain.User;

import com.unicom.peixun.enums.UnicomResponseEnums;

import com.unicom.peixun.web.UserController;

import org.apache.log4j.Logger;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Component;

import org.springframework.web.servlet.HandlerInterceptor;

import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import java.io.PrintWriter;

/**

• @program: peixun_matb3

• @description:

• @author: matengbing

• @create: 2018-10-18 10:40

**/

@Component

public class LoginInterceptor implements HandlerInterceptor {

private static Logger logger=Logger.getLogger(LoginInterceptor.class);

@Autowired

UserController userController;

// 在请求处理之前调用,只有返回true才会执行请求

@Override

public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {

HttpSession session=httpServletRequest.getSession();

User user=(User) session.getAttribute("user");

//登录过得用户直接通过

if(user!=null){

return true;

}

//未登录用户拦截，返回json数据

httpServletResponse.setCharacterEncoding("UTF-8");

httpServletResponse.setContentType("application/json; charset=utf-8");

PrintWriter out = httpServletResponse.getWriter() ;

try{

ResponseBean<Object> responseBean=new ResponseBean<>(false,null,UnicomResponseEnums.NOLOGIN);

out = httpServletResponse.getWriter();

out.append(JSON.toJSON(responseBean).toString());

return false;

}

catch (Exception e) {

e.printStackTrace();

httpServletResponse.sendError(500);

return false;

}

}

@Override

public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

}

@Override

public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

}

}

拦截器需要配置@configuration

package com.unicom.peixun.configuration;

import com.unicom.peixun.inteceptor.LoginInterceptor;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.servlet.config.annotation.InterceptorRegistry;

import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;

import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**

• @program:

• @description:

• @author: mtb

• @create: 2018-10-18 10:50

**/

@Configuration

public class LoginAdapter extends WebMvcConfigurerAdapter {

@Autowired

LoginInterceptor loginInterceptor;

@Override

public void addInterceptors(InterceptorRegistry registry) {

registry.addInterceptor(loginInterceptor)

.addPathPatterns("/**")

.excludePathPatterns("/login")

.excludePathPatterns("/swagger-resources/", "/webjars/", "/v2/", "/swagger-ui.html/");

super.addInterceptors(registry);

}

/**

• 配置静态访问资源

• @param registry

*/

@Override

public void addResourceHandlers(ResourceHandlerRegistry registry) {

registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");

registry.addResourceHandler("swagger-ui.html")

.addResourceLocations("classpath:/META-INF/resources/");

registry.addResourceHandler("/webjars/**")

.addResourceLocations("classpath:/META-INF/resources/webjars/");

super.addResourceHandlers(registry);

}

}

配置了拦截器拦截所有请求，不拦截/login，swagger的相关请求，静态资源的请求，

如果拦截了/login会出现循环重定向报错

如果拦截了swagger的相关请求，查看swagger文档时看不到相应资源

喜欢的点点关注，点点赞。

对Java技术，架构技术感兴趣的同学，欢迎加QQ群585550789，一起学习，相互讨论。

群内已经有小伙伴将知识体系整理好（源码，笔记，PPT，学习视频），欢迎加群领取。

标签：return,springboot,ResponseBean,String,peixun,import,restful,public,统一
来源： https://blog.51cto.com/14226273/2376121