java结果集数据封装

浅浅的花香味﹌ 2022-03-28 04:30 248阅读 0赞

** 1、自定义返回的code以及msg（可以增加新的）**

package cn.web959.vo;
    
    /**
     * Title:      ResultEnum
     * @author:    gaodeqiang
     * @date       2018年12月17日
     * @version    V1.0
     * Description: 返回值封装
     */
    public enum ResultEnum {
    
        SUCCESS("200", "操作成功"),
        ERROR("500", "操作失败"),
        WAIT("1111", "正在处理结果");
    
        private String code;
    
        private String msg;
    
        ResultEnum(String code, String msg) {
            this.code = code;
            this.msg = msg;
        }
    
        public int getCode() {
            return Integer.parseInt(code);
        }
    
        public String getMsg() {
            return msg;
        }
    }

**2、返回值封装（原理是Map集合的一个返回）**

package cn.web959.vo;
    
    import java.io.Serializable;
    import java.util.HashMap;
    
    /**
     * @author: gaodeqiang
     * @date 2018年8月15日
     * @version V1.0 
     * @Description: 结果集
     */
    public class R implements Serializable{
    
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 1L;
    
    	private int code;
    
    	private String msg;
    
    	private Object data;
    
    	
    	
    	/**
    	 * @return the code
    	 */
    	public int getCode() {
    		return code;
    	}
    
    	/**
    	 * @param code the code to set
    	 */
    	public void setCode(int code) {
    		this.code = code;
    	}
    
    	/**
    	 * @return the msg
    	 */
    	public String getMsg() {
    		return msg;
    	}
    
    	/**
    	 * @param msg the msg to set
    	 */
    	public void setMsg(String msg) {
    		this.msg = msg;
    	}
    
    	/**
    	 * @return the data
    	 */
    	public Object getData() {
    		return data;
    	}
    
    	/**
    	 * @param data the data to set
    	 */
    	public void setData(Object data) {
    		this.data = data;
    	}
    	
    	public static R ok(String msg) {
    		return new R(msg);
    	}
    
    	public static  R ok(String msg, Object data) {
    		return new R(ResultEnum.SUCCESS.getCode(), msg, data);
    	}
    	
    	public static  R ok(int code,String msg,Object data) {
    		return new R(code, msg, data);
    	}
    	
    	public static  R ok(int code,String msg) {
    		return new R(code, msg);
    	}
    
    	public static  R error(String msg) {
    		return new R(ResultEnum.ERROR.getCode(),msg);
    	}
    
    	public static  R error(String msg,Object data) {
    		return new R(ResultEnum.ERROR.getCode(), msg, data);
    	}
    	
    	public static  R error(int code,String msg) {
    		return new R(code, msg);
    	}
    
    
    	private R(Object data) {
    		this.code = ResultEnum.SUCCESS.getCode();
    		this.msg = ResultEnum.SUCCESS.getMsg();
    		this.data = data;
    	}
    
    	private R(String msg) {
    		this.code = ResultEnum.SUCCESS.getCode();
    		this.data = new HashMap<>();
    		this.msg = msg;
    	}
    
    	private R(int code, String msg) {
    		this.code = code;
    		this.data = new HashMap<>();
    		this.msg = msg;
    	}
    
    	private R(int code, String msg, Object data) {
    		this.code = code;
    		this.msg = msg;
    		this.data = data;
    	}
    }

使用方式：

@GetMapping("/test")
    	public R test() {
    		Map<String, String> map=new HashMap<String, String>();
    		map.put("test", "test");
    		//code、msg和data是必有值。返回为data数据为一个json对象，对象的key和value为map的key和value
    		return R.ok("获取成功",map);
    		List<String> list=new ArrayList<>();
    		list.add("test");
    		//返回值中data是一个数组，数组中数据是list中数据
    		return R.ok("获取成功",list);
    		//返回值中data是一个空对象
    		return R.ok("获取成功");
    		//R.error()支持上述所有操作
    	}

示例：

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