ylb-知识点1-结果集处理

1、ylb-RespResult

在web模块下view包，创建一个返回给前端应答结果类RespResult：

package com.bjpowernode.front.view;

import com.bjpowernode.common.enums.RCode;
import com.sun.javaws.jnl.RContentDesc;

import java.sql.ResultSet;
import java.util.List;

/**
 * 同一的应答结果。 controller方法的返回值都是它
 */
public class RespResult {
    //应答码，自定义的数字
    private int code;
    //code的文字说明，一般做提示给用户看
    private String msg;
    //访问token
    private String accessToken;
    //单个数据
    private Object data;
    //集合数据
    private List list;
    //分页
    private PageInfo page;



    //表示成功的RespResult对象
    public static RespResult ok(){
        RespResult result = new RespResult();
        result.setRCode(RCode.SUCC);
        return result;
    }
    //表示失败的RespResult对象
    public static RespResult fail(){
        RespResult result = new RespResult();
        result.setRCode(RCode.UNKOWN);
        return result;
    }



    public void setRCode(RCode rcode){
        this.code = rcode.getCode();
        this.msg = rcode.getText();
    }

    public String getAccessToken() {
        return accessToken;
    }

    public void setAccessToken(String accessToken) {
        this.accessToken = accessToken;
    }

    public List getList() {
        return list;
    }

    public void setList(List list) {
        this.list = list;
    }

    public PageInfo getPage() {
        return page;
    }

    public void setPage(PageInfo page) {
        this.page = page;
    }

    public int getCode() {
        return code;
    }

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

    public String getMsg() {
        return msg;
    }

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

    public Object getData() {
        return data;
    }

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

2、reggie-R

在common包下：

package com.itheima.reggie.common;

import lombok.Data;

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

/**
 * 通用返回结果，服务端响应的数据最终都会封装成此对象
 * @param 
 */
@Data
public class R<T> implements Serializable {

    private Integer code; //编码：1成功，0和其它数字为失败

    private String msg; //错误信息

    private T data; //数据

    private Map map = new HashMap(); //动态数据

    public static <T> R<T> success(T object) {
        R<T> r = new R<T>();
        r.data = object;
        r.code = 1;
        return r;
    }

    public static <T> R<T> error(String msg) {
        R r = new R();
        r.msg = msg;
        r.code = 0;
        return r;
    }

    public R<T> add(String key, Object value) {
        this.map.put(key, value);
        return this;
    }

}

3、ruoyi-R

在common模块，core.domain包下：

package com.ruoyi.common.core.domain;

import java.io.Serializable;
import com.ruoyi.common.constant.HttpStatus;

/**
 * 响应信息主体
 *
 * @author ruoyi
 */
public class R<T> implements Serializable
{
    private static final long serialVersionUID = 1L;

    /** 成功 */
    public static final int SUCCESS = HttpStatus.SUCCESS;

    /** 失败 */
    public static final int FAIL = HttpStatus.ERROR;

    private int code;

    private String msg;

    private T data;

    public static <T> R<T> ok()
    {
        return restResult(null, SUCCESS, "操作成功");
    }

    public static <T> R<T> ok(T data)
    {
        return restResult(data, SUCCESS, "操作成功");
    }

    public static <T> R<T> ok(T data, String msg)
    {
        return restResult(data, SUCCESS, msg);
    }

    public static <T> R<T> fail()
    {
        return restResult(null, FAIL, "操作失败");
    }

    public static <T> R<T> fail(String msg)
    {
        return restResult(null, FAIL, msg);
    }

    public static <T> R<T> fail(T data)
    {
        return restResult(data, FAIL, "操作失败");
    }

    public static <T> R<T> fail(T data, String msg)
    {
        return restResult(data, FAIL, msg);
    }

    public static <T> R<T> fail(int code, String msg)
    {
        return restResult(null, code, msg);
    }

    private static <T> R<T> restResult(T data, int code, String msg)
    {
        R<T> apiResult = new R<>();
        apiResult.setCode(code);
        apiResult.setData(data);
        apiResult.setMsg(msg);
        return apiResult;
    }

    public int getCode()
    {
        return code;
    }

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

    public String getMsg()
    {
        return msg;
    }

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

    public T getData()
    {
        return data;
    }

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

    public static <T> Boolean isError(R<T> ret)
    {
        return !isSuccess(ret);
    }

    public static <T> Boolean isSuccess(R<T> ret)
    {
        return R.SUCCESS == ret.getCode();
    }
}