package com.lxj.demo;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
public class Http extends Thread{
  // 下載結束的回調接口
  public interface IResult{
    void success(String msg);
    void fail(String msg);
  }
  // 創建網絡地址的引用
  String addr;
  // 創建回調接口的引用
  IResult iResult ;
  // 生成構造方法把網絡和接口的引用傳進去
  public Http(String addr, IResult iResult) {
    super();
    this.addr = addr;
    this.iResult = iResult;
    // 開啟線程 線程一開啟就產生了異步
    start();
  }
  @Override
  // 重寫線程的run方法，只要是網絡就要用到多線程
  public void run() {
    try {
      // 創建URL，把網絡地址傳進去
      URL url = new URL(addr);
      try {
        // 利用字符緩沖讀取流讀取網絡數據
        BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()));
        // 創建stringbuffer對象
        StringBuffer sb = new StringBuffer();
        // 創建一個臨時儲存字符串的變量
        String temp;
        // 當temp不為空是就一直讀取數據
        while ((temp = br.readLine()) != null) {
          sb.append(temp);
        }
        // 數據讀取成功后
        // 把讀取的所有數據傳到回調接口，再由接口傳出去
        iResult.success(sb.toString());
      } catch (IOException e) {
        e.printStackTrace();
      }
    } catch (MalformedURLException e) {
      e.printStackTrace();
      // 網絡請求發生異常
      iResult.fail("網絡請求失敗");
    }
  }
}

package com.lxj.demo;
import net.sf.json.JSONObject;
import com.xykj.demo.Http.IResult;
public class IPRequest {
  // 請求IP信息的回調接口，在這里必須要使用回調，因為不知道Http什么時候下載完成
  public interface IRequest{
    void success(IPBean ipBean);
    void fail(String msg);
  }
  // 只要給一個ip地址和回調接口，我們可以通過回調接口傳回轉化好的ip信息對象
  public void request(String IP,IRequest iRequest){
    // 把用戶輸入的ip地址拼接到url中，發起Http請求
    String addr ="http://apicloud.mob.com/ip/query?key=520520test&ip="
        + IP
        + "";
    new Http(addr, new IResult() {
      // 創建完的IResult success和fail不會馬上調用，必須要等到Http下載完成或者發生異常才會調用
      @Override
      public void success(String msg) {
        // 把接收的json數據轉化成IPBean對象
        JSONObject jsonObject = JSONObject.fromObject(msg);
        IPBean ipBean = (IPBean) JSONObject.toBean(jsonObject, IPBean.class);
        // 產生回調，把轉化好的對象傳遞出去給Demo
        iRequest.success(ipBean);
      }
      @Override
      public void fail(String msg) {
        // Http請求失敗的時候
        iRequest.fail(msg);
      }
    });
  }
}

package com.lxj.demo;
public class IPBean {
  public static class Result{
    private String city;
    private String country;
    private String ip;
    private String province;
    public String getCity() {
      return city;
    }
    public void setCity(String city) {
      this.city = city;
    }
    public String getCountry() {
      return country;
    }
    public void setCountry(String country) {
      this.country = country;
    }
    public String getIp() {
      return ip;
    }
    public void setIp(String ip) {
      this.ip = ip;
    }
    public String getProvince() {
      return province;
    }
    public void setProvince(String province) {
      this.province = province;
    }
    @Override
    // 這里必須要重寫toString方法，否則將打印的內存里面的地址
    public String toString() {
      return "city：" + city + "\ncountry：" + country + "\nip："
          + ip + "\nprovince：" + province;
    }
  }
  Result result;
  private String msg;
  private String retCode;
  public Result getResult() {
    return result;
  }
  public void setResult(Result result) {
    this.result = result;
  }
  public String getMsg() {
    return msg;
  }
  public void setMsg(String msg) {
    this.msg = msg;
  }
  public String getRetCode() {
    return retCode;
  }
  public void setRetCode(String retCode) {
    this.retCode = retCode;
  }
}

package com.lxj.demo;
import java.util.Scanner;
import com.xykj.demo.IPRequest.IRequest;
public class Demo {
  public static void main(String[] args) {
    System.out.println("************歡迎使用IP查詢系統************");
    Scanner sc = new Scanner(System.in);
    // 創建IPRequest對象
    IPRequest ipRequest = new IPRequest();
    while (true) {
      System.out.println("請輸入要查詢的IP:");
      String ip = sc.next();
      // 調用IPRequest里面的request方法
      ipRequest.request(ip, new IRequest() {
        @Override
        public void success(IPBean ipBean) {
          System.out.println("*************查詢結果*************");
          System.out.println(ipBean.getResult());
        }
        @Override
        public void fail(String msg) {
          System.out.println(msg);
        }
      });
    }
  }
}