前言：
前段时间接手了一个老项目，现在需要在此项目中添加一些新的需求，同事在开发过程中遇到了一些问题？
1.成功的状态到底是200还是0啊，订单系统200代表成功，而会员系统却是0代表成功。 2.接口返回的结果中，有些是用msg字段表示描述，有些又是用desc字段描述，前段处理起来比较麻烦能不能统一。 3.错误提示信息需要支持国际化。其实这些问题，归根究底还是代码规范问题，我们需要将接口定义和全局异常统一处理，历史项目10多个工程，难道每个工程都去实现一遍，答案可定是不可能的。
1、解决方案
定义公共模块，实现统一接口定义规范和异常处理，其他的系统进行依赖和扩展即可。
2、具体实现
2.1 定义状态码统一接口
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public interface BaseResultCode { /** * 状态码 * @return */ int getCode(); /** * 提示信息 * @return */ String getMsg(); } |
2.2 公共模块状态码枚举类
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public enum ResultCode implements BaseResultCode { OK( 200 , "成功" ), ERROR( 300 , "系统异常" ), NEED_AUTH( 301 , "非法请求,请重新登录" ), PARAMTER_ERROR( 302 , "参数错误" ); //省略其他定义错误码 private int code; private String msg; private ResultCode( int code, String msg) { this .code = code; this .msg = msg; } public static ResultCode getValue( int code) { for (ResultCode errorCode : values()) { if (errorCode.getCode() == code) { return errorCode; } } return null ; } //省略Get、Set方法 } |
2.3 定义全局自定义异常
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public class SysException extends RuntimeException { private static final long serialVersionUID = 5225171867523879342L; private int code; private String msg; private Object[] params; private BaseResultCode errorCode; public SysException() { super (); } public SysException(String message) { super (message); } public SysException(Throwable cause) { super (cause); } public SysException( int code ,String message) { this .code = code; this .msg = message; } public SysException( int code ,String message, Object[] params) { this (code, message); this .params= params; } public SysException(String message, Throwable cause) { super (message, cause); } public SysException(BaseResultCode errorCode) { this .errorCode = errorCode; } public SysException(String message, Object[] params) { super (message); this .params = params; } public SysException(BaseResultCode errorCode, String message, Object[] params) { this (message, params); this .errorCode = errorCode; }
/** * Construct by default * * @param message * message * @param parameters * parameters * @param cause * cause */ public SysException(String message, Object[] params, Throwable cause) { super (message, cause); this .params = params; }
public int getCode() { return code; } public void setCode( int code) { this .code = code; } public String getMsg() { return msg; } public void setMsg(String msg) { this .msg = msg; } /** * @return the params */ public Object[] getParams() { return params; } /** * @param params * the params to set */ public void setParams(Object[] params) { this .params = params; } public BaseResultCode getErrorCode() { return errorCode; } public void setErrorCode(BaseResultCode errorCode) { this .errorCode = errorCode; }
} |
2.4 定义统一接口格式输出类
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public class Result implements Serializable { private static final long serialVersionUID = -1773941471021475043L; private Object data; private int code; private String msg; public Result() { } public Result( int code, Object data, String msg) { this .code = code; this .data = data; this .msg = msg; } public Result( int code, String desc) { this (code, null , desc); } public Result(BaseResultCode errorCode) { this (errorCode.getCode(), null , errorCode.getMsg()); } public static Result success() { return success( null ); } public static Result success(Object data) { Result result = new Result(); result.setData(data); result.setCode(ResultCode.OK.getCode()); return result; } public static Result error(String msg) { Result result = new Result(); result.setCode(ResultCode.ERROR.getCode()); result.setMsg(msg); return result; } public static Result error(BaseResultCode baseCode) { Result result = new Result(); result.setCode(baseCode.getCode()); result.setMsg(baseCode.getMsg()); return result; } } |
个人建议：统一接口输出类不要定义为泛型类型
2.5 定义统一接口格式输出类
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@RestControllerAdvice public class SysExceptionHandler { public static Log logger = LogManager.getLogger(SysExceptionHandler. class ); @ExceptionHandler (Exception. class ) public Result handleException(HttpServletRequest request, Exception ex) { logger.error( "Handle Exception Request Url:{},Exception:{}" ,request.getRequestURL(),ex); Result result = new Result(); //系统异常 if (ex instanceof SysException) { SysException se = (SysException) ex; BaseResultCode resultCode =se.getErrorCode(); if (resultCode== null ) { result = Result.error(se.getMessage()); } else { result = new Result(resultCode.getCode(), StringUtil.isNotEmpty(se.getMessage())?se.getMessage():resultCode.getMsg()); } } //参数错误 else if (ex instanceof ConstraintViolationException) { ConstraintViolationException v = (ConstraintViolationException) ex; String message = v.getConstraintViolations().iterator().next() .getMessage(); result.setCode(ResultCode.PARAMTER_ERROR.getCode()); result.setMsg(ResultCode.PARAMTER_ERROR.getMsg() + ":" + message); } //参数错误 else if (ex instanceof BindException) { BindException v = (BindException) ex; String message = v.getAllErrors().stream().map(ObjectError::getDefaultMessage).collect(Collectors.joining( "," )); result.setCode(ResultCode.PARAMTER_ERROR.getCode()); result.setMsg(ResultCode.PARAMTER_ERROR.getMsg() + ":" + message); } //参数错误 else if (ex instanceof MethodArgumentNotValidException) { MethodArgumentNotValidException v = (MethodArgumentNotValidException) ex; String message = v.getBindingResult().getAllErrors().stream().map(ObjectError::getDefaultMessage).collect(Collectors.joining( "," )); result.setCode(ResultCode.PARAMTER_ERROR.getCode()); result.setMsg(ResultCode.PARAMTER_ERROR.getMsg() + ":" + message); } else { result = new Result(ResultCode.ERROR.getCode(),ExceptionUtil.getErrorMsg(ex)); } logger.info( "exception handle reuslt:" + result); return result; } } |
上述定义已经可以实现全局接口和异常的统一处理，但是存在的如下问题
每个 controller 都需要返回Reesult类型，且每个方法都需要返回 Result.success() 或者 Result.success(data) 的结果，有点重复，需要进行优化。
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@GetMapping ( "addUser" ) public Result add() { for ( int i= 0 ;i< 10 ;i++) { TUser user = new TUser(); //user.setOid(IdWorker.getId()); user.setName( "shareing_" +i); user.setAge(i); userService.addUser(user); } return Result.success(); } |
2.6 接口统一输出优化
实现方式只需要实现ResponseBodyAdvice接口，重写beforeBodyWrite方法接口。
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@RestControllerAdvice public class ResponseAdvice implements ResponseBodyAdvice<Object> { private Logger logger = LoggerFactory.getLogger(ResponseAdvice. class ); @Override public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) { return true ; } @Override public Object beforeBodyWrite(Object o, MethodParameter returnType, MediaType selectedContentType, Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) { logger.info( "before body write param:{}" ,o); if (o instanceof String) { //序列化结果输出 return FastJsonUtil.toJSONString(Result.success(o)); } else if (o instanceof Result) { return o; } return Result.success(o); } } |
经过优化后， controller 输出可以根据业务的需求定义输出对象。
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@GetMapping ( "getUserByName" ) public TUser getUserByName1( @RequestParam String name) { logger.info( "getUserByName paramter name:" +name); return userService.getUserByName(name); } |
2.7 子系统如何实现
子系统引入common的jar包，
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<dependency> <groupId>com.xx</groupId> <artifactId>xx-common</artifactId> <version> 2.0 </version> </dependency> |
3、子系统定义状态码，实现BaseResultCode接口
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public enum OrderModelErrorCode implements BaseResultCode { ORDER_STATUS_ERROR( 1000 , "订单状态不正确" ); private int code; private String msg; private UserModelErrorCode( int code, String msg) { this .code = code; this .msg = msg; } @Override public int getCode() { return code; } @Override public String getMsg() { return msg; } } |
定义异常处理类，继承公共异常处理类 SysExceptionHandler
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@RestControllerAdvice public class OrderModalExceptionHandle extends SysExceptionHandler { @Override public Result handleException(HttpServletRequest request, Exception ex) { return super .handleException(request, ex); //子系统可以扩展异常处理 } } |
子系统使用示例：
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@Override public Order getOrder(String orderId) { Order order =getOrder(orderId); //相关伪代码 if (order.getStatus()> 120 ) { throw new SysException(OrderModelErrorCode.ORDER_STATUS_ERROR); } return order; } |
经过相关项目的重构，已经解决了第一个和第二问题，关于第三个国际化问题，将在后续的文章中讲解。
到此这篇关于Spring Boot统一接口返回以及全局异常处理的文章就介绍到这了,更多相关Spring Boot异常处理内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持！
原文链接：https://juejin.cn/post/7086031796755922981
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