java自定义异常

package pay.common.exception;

@SuppressWarnings("serial")
public class PayException extends Exception{
private int ExceptionId;//错误码
private String info; //错误信息
public PayException(int exceptionId, String info) {
super();
ExceptionId = exceptionId;
this.info = info;
}
public PayException(int exceptionId) {
ExceptionId = exceptionId;
}

public PayException(String info) {
super(info);
this.info = info;
}
public String toString()
{
return (new StringBuilder()).append("PayException,CODE=").append(ExceptionId).toString();
}

public String getInfo() {
return info;
}

public int getExceptionId() {
return ExceptionId;
}

public static byte INTERNAL = -2;//内部错误
public static byte MDB_INTERNAL = -6;//数据库错误
}

} catch (HttpException e) {
throw new PayException(PayException.INTERNAL,e.getMessage());
} catch (IOException e) {
postMethod.releaseConnection();// 考虑长连接？
SimpleHttpConnectionManager connM = (SimpleHttpConnectionManager) httpClient
.getHttpConnectionManager();
connM.closeIdleConnections(0);
throw new PayException(PayException.INTERNAL,e.getMessage());