自定义异常，异常枚举类，ajax请求业务类（纯是为了自己抄代码方便）

自定义异常

public class BizCommonException extends RuntimeException {
    private int code;
    private String message;

    public BizCommonException(int code, String message) {
        super(message);
        this.code = code;
        this.message = message;
    }

    public BizCommonException(BizCommonExceptionEnum bizCommonExceptionEnum) {
        this.code = bizCommonExceptionEnum.getCode();
        this.message = bizCommonExceptionEnum.getMessage();
    }

    public String getMessage() {
        return this.message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public int getCode() {
        return this.code;
    }

    public void setCode(int code) {
        this.code = code;
    }
}

自定义异常枚举类

public enum BizCommonExceptionEnum {
	SERVER_ERROR(500, "服务器异常,请联系系统运维人员"),
    NO_THIS_USER(400, "没有此用户")；


    private int code;
    private String message;

    private BizCommonExceptionEnum(int code, String message) {
        this.code = code;
        this.message = message;
    }

    public int getCode() {
        return this.code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMessage() {
        return this.message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}

ajax请求业务类

public class AjaxCommonObject {
    private int code;
    private String message;
    private Object data;

    public AjaxCommonObject() {
        this.code = 0;
        this.message = "ajax业务请求正确响应";
    }

    public AjaxCommonObject(int code, String message) {
        this.code = code;
        this.message = message;
    }

    public AjaxCommonObject(BizCommonException bizCommonException) {
        this.code = bizCommonException.getCode();
        this.message = bizCommonException.getMessage();
    }

    public AjaxCommonObject(BizCommonExceptionEnum bizCommonExceptionEnum) {
        this.code = bizCommonExceptionEnum.getCode();
        this.message = bizCommonExceptionEnum.getMessage();
    }

    public int getCode() {
        return this.code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMessage() {
        return this.message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public Object getData() {
        return this.data;
    }

    public void setData(Object data) {
        this.data = data;
    }
}

应用实例

	@RequestMapping(value = "/update",method = RequestMethod.POST)
    @ResponseBody
    public AjaxCommonObject update(@RequestBody User user) {
        AjaxCommonObject ajaxCommonObject = new AjaxCommonObject();
        try {
            bizService.update(user);
        } catch (BizCommonException e) {
            return new AjaxCommonObject(e);
        }
        return ajaxCommonObject;
    }