自定义一个消息返回类（Msg）

代码如下

package cn.orz.bean;



import java.util.HashMap;
import java.util.Map;

public class Msg {
    //状态码 10001 成功 10002失败
    private int code;
    private String msg;
    private Map extend=new HashMap();

    /**
     * 返回成功
     * @return
     */
    public static  Msg Success (){
        Msg result = new Msg();
        result.setCode(10001);
        result.setMsg("成功");
        return result;
    }

    /***
     * 返回失败
     * @return
     */
    public static  Msg fail (){
        Msg result = new Msg();
        result.setCode(10002);
        result.setMsg("失败");
        return result;
    }

    public Msg Add(String key,Object value){
        this.getExtend().put(key,value);
        return this;
    }

    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 Map getExtend() {
        return extend;
    }

    public void setExtend(Map extend) {
        this.extend = extend;
    }

    @Override
    public String toString() {
        return "Msg{" +
                "code=" + code +
                ", msg='" + msg + '\'' +
                ", extend=" + extend +
                '}';
    }

}