状态码封装枚举类
使用枚举的好处是把状态码和状态信息结合到了一起，当然不使用枚举类用静态成员变量也行，状态码信息需要单独封装。

/**
 * 方法执行状态工具类
 * @author lqc
 */
public enum ResultCode {
    SUCCESS(200, "操作成功"),
    FAILED(500, "操作失败"),
    FORBIDDEN(403, "没有权限执行"),
    PARAMETER_ERROR(404, "传递参数有误~"),
    UNAUTHORIZED(403, "暂未登录或token已经过期");

    private int code;
    private String msg;

    ResultCode(int code, String msg) {
        this.code = code;
        this.msg = msg;
    }

    public int getCode() {
        return code;
    }

    public String getMsg() {
        return msg;
    }
}

返回结果封装类
import java.io.Serializable;
import java.util.HashMap;

/**
 * @author lqc
 */
public class CommonResult implements Serializable {

    /**
     * 状态码
     */
    private int code = 0;

    /**
     * 提示信息
     */
    private String msg;
    /**
     * json数据域
     */
    private Object data = null;

    public CommonResult() {

    }

    public CommonResult(int code,String msg,Object data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }

    public static CommonResult newInstance(int code,String msg,Object data){
        return new CommonResult(code,msg,data);
    }

    public static CommonResult newInstance(int code,String msg){
        return new CommonResult(code,msg,null);
    }

    /**
     * 在map中存放多个数据
     * @param key
     * @param data
     */
    public CommonResult putData(String key, Object data) {
        if (this.data == null || !(data instanceof HashMap)) {
            this.data = new HashMap<String, Object>();
        }
        ((HashMap<String, Object>) this.data).put(key, data);
        return this;
    }

    /**
     * 在map中清除数据
     * @param key
     */
    public CommonResult removeData(String key){
        if(data != null && data instanceof HashMap){
            ((HashMap<String,Object>)data).remove(key);
        }
        return this;
    }

    /**
     * 设置错误的状态码
     * @param CODE
     */
    public CommonResult setCode(ResultCode CODE) {
        this.code = CODE.getCode();
        this.msg = CODE.getMsg();
        return this;
    }

    /**
     * 设置状态码和数据
     * @param CODE
     * @param data
     */
    public CommonResult setCode(ResultCode CODE, Object data) {
        this.code = CODE.getCode();
        this.msg = CODE.getMsg();
        this.data = data;
        return this;
    }


    public CommonResult setException(Exception e){
        if(e != null) {
            this.setCode(ResultCode.FAILED.getCode());
            this.setMsg(e.getMessage());
        }
        return this;
    }

    public static CommonResult success(){
        return new CommonResult(ResultCode.SUCCESS.getCode(),ResultCode.SUCCESS.getMsg(),null);
    }

    public static CommonResult success(Object data){
        return new CommonResult(ResultCode.SUCCESS.getCode(),ResultCode.SUCCESS.getMsg(),data);
    }


    public static CommonResult success(Object data,String msg){
        return new CommonResult(ResultCode.SUCCESS.getCode(),msg,data);
    }


    public static CommonResult failed(){
        return new CommonResult(ResultCode.FAILED.getCode(),ResultCode.FAILED.getMsg(),null);
    }

    public static CommonResult failed(String msg){
        return new CommonResult(ResultCode.FAILED.getCode(),msg,null);
    }

    public static CommonResult failed(int code,String msg){
        return new CommonResult(code,msg,null);
    }

    public static CommonResult parameterError(){
        return new CommonResult(ResultCode.PARAMETER_ERROR.getCode(),ResultCode.PARAMETER_ERROR.getMsg(),null);
    }

    public static CommonResult forbidden(){
        return new CommonResult(ResultCode.FORBIDDEN.getCode(),ResultCode.FORBIDDEN.getMsg(),null);
    }


    public int getCode() {
        return code;
    }

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

    public String getMsg() {
        return msg;
    }

    public CommonResult setMsg(String msg) {
        this.msg = msg;
        return this;
    }

    public Object getData() {
        return data;
    }

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

使用示例
//设置状态码并存入数据，可以连续put多个数据
return CommonResult.newInstance(200, "ok").putData("user", user);
return CommonResult.newInstance(200, "ok").putData("user", user).putData("deptList",deptList);
// 直接返回成功
return CommonResult.success("ok");
// 直接返回操作失败
return CommonResult.failed();