## 错误码设计规范
错误码，参考新浪微博 open api
http://open.weibo.com/wiki/Error_code
https://blog.csdn.net/huangwenyi1010/article/details/51581906
| 服务级错误（1为系统级错误）| 服务模块代码(即业务模块标识) |具体错误代码
| --- | --- | --- |
| 2 | 02 |001
> 服务级错误:1为系统级错误，2为业务逻辑错误
>2 00 001 释义： 00 = System 业务模块标识，001为具体的错误代码
统一异常处理封装所在的包：`org.coderfun.common.exception`
> 项目中统一使用AppException
## IErrorCode错误码枚举
参见`org.coderfun.boot.core.exception.BootErrorCode `
```
public enum BootErrorCode implements IErrorCode{
DEMO_NOT_UPDATE (403, 202000L,"演示模式，无法更新数据!"),
USER_LOGIN_NAME_EXITS (400, 202001L,"管理员账号已经存在!"),
LOGIN_FAILED (400, 202002L, "用户名或密码错误！"),
OLD_PASSWORD_WRONG (400, 202004L,"原密码错误！"),
CAPTCHA_WORNG (400, 202005L,"验证码错误！"),
LOGIN_FORBIDDEN (403, 202003L,"登录被禁用！");
Long code;
int httpStatus;
String messageFormat;
private BootErrorCode(int httpStatus, Long code, String messageFormat) {
this.httpStatus = httpStatus;
this.code = code;
this.messageFormat = messageFormat;
}
@Override
public long getCode() {
// TODO Auto-generated method stub
return this.code;
}
@Override
public String getMessageFormat() {
// TODO Auto-generated method stub
return this.messageFormat;
}
@Override
public int getHttpStatus() {
return this.httpStatus;
}
}
```
## ExceptionConverter错误转换器
参见`org.coderfun.boot.core.exception.BootExceptionConverter`
```
public class BootExceptionConverter implements ExceptionConverter{
@Override
public AppException convertException(Exception ex) {
// TODO Auto-generated method stub
if(ex instanceof LockedAccountException){
return new AppException(BootErrorCode.LOGIN_FORBIDDEN);
}
if(ex instanceof AuthorizationException){
return new AppException(ErrorCodeEnum.UNAUTHORIZED);
}
if(ex instanceof InvalidDataAccessResourceUsageException){
return new AppException(BootErrorCode.DEMO_NOT_UPDATE);
}
return null;
}
}
```
## 注册ExceptionConverter
配置文件，`classpath:application.xml`
```
<!-- 异常处理 -->
<bean id="exceptionConvertHandler" class="org.coderfun.common.exception.ExceptionConvertHandler">
<constructor-arg>
<list>
<bean class="org.coderfun.common.exception.DefaultExceptionConverter"/>
<bean class="org.coderfun.boot.core.exception.BootExceptionConverter"/>
</list>
</constructor-arg>
</bean>
```
> 注意：多个ExceptionConverter，同类型Exception，跟顺序有关，先匹配先返回
