Asynchronous Callback Case of IP Query System

Without further ado, please see the code:

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{
  // Callback interface for the end of download
  public interface IResult{
    void success(String msg);
    void fail(String msg);
  }
  // Create a reference to the network address
  String addr;
  // Create a reference to the callback interface
  IResult iResult ;
  // Generate a constructor to pass the network and interface references into it
  public Http(String addr, IResult iResult) {
    super();
    this.addr = addr;
    this.iResult = iResult;
    // Start the thread; once the thread is started, asynchronous operation is generated
    start();
  }
  @Override
  // Override the thread's run method, as multi-threading is required for any network operation
  public void run() {
    try {
      // Create a URL and pass the network address into it
      URL url = new URL(addr);
      try {
        // Use a character buffered reading stream to read network data
        BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()));
        // Create a StringBuffer object
        StringBuffer sb = new StringBuffer();
        // Create a temporary variable to store the string
        String temp;
        // Continue to read data as long as temp is not empty
        while ((temp = br.readLine()) != null) {
          sb.append(temp);
        }
        // After the data read is successful
        // Pass all the read data to the callback interface, and then transmit it through the interface
        iResult.success(sb.toString());
      catch (IOException e) {
        e.printStackTrace();
      }
    catch (MalformedURLException e) {
      e.printStackTrace();
      // Network request exception occurred
      iResult.fail("Network request failed");
    }
  }
}

package com.lxj.demo;
import net.sf.json.JSONObject;
import com.xykj.demo.Http.IResult;
public class IPRequest {
  // Callback interface for IP information request, it is necessary to use callback here because it is unknown when the HTTP download will be complete
  public interface IRequest{
    void success(IPBean ipBean);
    void fail(String msg);
  }
  // Just provide an IP address and a callback interface, and we can pass back the converted IP information object through the callback interface
  public void request(String IP, IRequest iRequest){
    // Append the user input IP address to the URL and initiate an HTTP request
    String addr ="http://apicloud.mob.com/ip/query?key=520520test&ip="
        + IP
        + "";
    new Http(addr, new IResult() {
      // The created IResult success and fail will not be called immediately, and must wait until the HTTP download is complete or an exception occurs
      @Override
      public void success(String msg) {
        // Convert the received JSON data into an IPBean object
        JSONObject jsonObject = JSONObject.fromObject(msg);
        IPBean ipBean = (IPBean) JSONObject.toBean(jsonObject, IPBean.class);
        // Generate a callback and pass the converted object to Demo
        iRequest.success(ipBean);
      }
      @Override
      public void fail(String msg) {
        // When the HTTP request fails
        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
    // Here, the toString method must be overridden, otherwise the memory address where the output is printed will be displayed
    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("************Welcome to the IP Query System************");
    Scanner sc = new Scanner(System.in);
    // Create an IPRequest object
    IPRequest ipRequest = new IPRequest();
    while (true) {
      System.out.println("Please enter the IP to query:");
      String ip = sc.next();
      // Call the request method inside IPRequest
      ipRequest.request(ip, new IRequest() {
        @Override
        public void success(IPBean ipBean) {
          System.out.println("*************Query Results*************");
          System.out.println(ipBean.getResult());
        }
        @Override
        public void fail(String msg) {
          System.out.println(msg);
        }
      });
    }
  }
}

That's all for this article. I hope the content of this article can bring some help to everyone's learning or work, and I also hope to get more support for the Yelling Tutorial!

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