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
public interface BaseResultCode
{
int getCode();
String getMsg();
}2.2 公共模块状态码枚举类
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
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;
}
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;
}
public Object[] getParams()
{
return params;
}
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
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
@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。
@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。
@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。
@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，
<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
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
@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：
@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。
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