ErrorCode枚举类型返回错误码信息测试，手动抛出异常信息，在事务中根据错误码来回滚事务的思路。

public enum ErrorCode {
    //系统级
    SUCCESS("000000","success"), 
    SYS_ERROR("999999","系统异常"),
    FAILED("900000","操作失败！"),
    //交易部分
    OWNER_NOT_EXIST("500002","用户（车主）不存在"),
    ;
    
    private String code;
    private String text;
    
    private ErrorCode(String code, String text) {   
        this.code = code;   
        this.text = text;   
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }
    
    public String getText() {
        return text;
    }
    
    public void setText(String text) {
        
        this.text = text;
    } 

    
    public static void main(String[] args) {

        ErrorCode error = ErrorCode.FAILED;
        try {
            error = testFun(100);    //测试方法。
        } catch (Exception e) {
            System.err.println("e: " + e);
            String errorMsg = e.getMessage(); 
            System.err.println("errorMsg: " + errorMsg);
            System.err.println("errorMsg2: " + e.getLocalizedMessage());
            
            if(errorMsg != null){
                String[] msg = errorMsg.split(",");
                if(msg != null && msg.length > 0){
                    ErrorCode.SYS_ERROR.setCode(msg[0]);
                    ErrorCode.SYS_ERROR.setText(msg[1]);                
                }
            }
            //返回错误码
            error = ErrorCode.SYS_ERROR;
            System.err.println("code: " + error.getCode() );
            System.err.println("text: " + error.getText() );
            
        }
        
    }

    private static ErrorCode testFun(int i) throws Exception {
        System.err.println("接收到的参数值：" + i);
        ErrorCode error = ErrorCode.OWNER_NOT_EXIST;
        String errorMsg = error.getCode() + "," + error.getText();  //将异常信息返回。
        throw new Exception(errorMsg);      //手动抛出异常。
//        throw new Exception();      //手动抛出异常。
        //return null;
    }
}