基于UDP传输协议局域网文件接收软件设计 Java版

　　网路传输主要的两大协议为TCP/IP协议和UDP协议，本文主要介绍基于UDP传输的一个小软件分享，针对于Java网络初学者是一个很好的练笔，大家可以参考进行相关的联系，但愿能够帮助到大家。

　　话不多说，直接上代码结构图：

　　

　　FindThread类是为了创建接收服务线程，GetLocalHostAddress类是为了获取本地IP地址，作为远程传输的目标地址，GetLocalTime是为了获取本地时间，为主界面提示信息建立时间戳，GetRandomNumber是为了方便创建端口号的，端口号正常范围是0到65535，（具体信息请百度，谢谢，有的人老是问为什么，我不禁要说一句How old are you！为什么不能自己去查一查呢！）GetSavePath类是为了实现存储功能，路径由用户自定义，MyRunable是上文所提线程的实例化，UDPReceiveSever类是详细实现协议功能，也是这个软件的核心部分。下面具体详细的列一下实现代码：

　　FindThread类

 1 package fc;
 2
 3 public class FindThread {
 4     public static Thread findThread(long threadId) {
 5         ThreadGroup group = Thread.currentThread().getThreadGroup();
 6         while(group != null) {
 7             Thread[] threads = new Thread[(int)(group.activeCount() * 1.2)];
 8             int count = group.enumerate(threads, true);
 9             for(int i = 0; i < count; i++) {
10                 if(threadId == threads[i].getId()) {
11                     return threads[i];
12                 }
13             }
14             group = group.getParent();
15         }
16         return null;
17     }
18 }

　　GetLocalHostAddress类

 1 package fc;
 2
 3 import java.net.InetAddress;
 4 import java.net.UnknownHostException;
 5
 6 public class GetLocalHostAddress {
 7
 8     public String getLocalHostAddress() throws UnknownHostException{
 9         InetAddress ia = InetAddress.getLocalHost();
10         String ip= ia.getHostAddress();
11         return ip;
12     }
13
14 }

　　GetLocalTime类

 1 package fc;
 2
 3 import java.text.SimpleDateFormat;
 4 import java.util.Date;
 5
 6 public class GetLocalTime {
 7
 8     public String getLocalTime(){
 9         Date date = new Date();
10         SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
11         String time = dateFormat.format(date);
12         return time;
13     }
14 }

　　GetRandomNumber类

 1 package fc;
 2
 3 import java.util.Random;
 4
 5 public class GetRandomNumber {
 6
 7     public int getRandomNumber(){
 8         int max=65535;
 9         int min=1025;
10         Random random_N = new Random();
11         int num = random_N.nextInt(max)%(max-min+1) + min;
12         return num;
13     }
14 }

　　GetSavePath类

 1 package fc;
 2
 3 import java.io.File;
 4
 5 import javax.swing.JFileChooser;
 6 import javax.swing.JLabel;
 7
 8 public class GetSavePath {
 9
10     private String filepath = "";
11     public String getSavePath(){
12         JFileChooser jfc=new JFileChooser();
13         jfc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
14         jfc.showDialog(new JLabel(), "选择路径");
15         File file=jfc.getSelectedFile();
16         if(file.isDirectory()){
17         }else if(file.isFile()){
18         }
19         this.filepath=file.getAbsolutePath();
20         return filepath;
21     }
22 }

　　MyRunable类

 1 package fc;
 2
 3 import java.io.IOException;
 4
 5 public class MyRunnable implements Runnable {
 6     public void run() {
 7         UDPReceiveService urs = new UDPReceiveService();
 8         try {
 9             urs.receiveFile();
10         } catch (IOException | InterruptedException e) {
11             e.printStackTrace();
12         }
13     }
14 }

　　UDPReceiveService类

 1 package fc;
 2
 3 import java.io.BufferedOutputStream;
 4 import java.io.DataOutputStream;
 5 import java.io.FileOutputStream;
 6 import java.io.IOException;
 7 import java.net.DatagramPacket;
 8 import java.net.DatagramSocket;
 9
10 import fm.MainWindows;
11
12 public class UDPReceiveService {
13
14     public static String IP         = "";
15     public static String filePath     = "";
16     public static int      Port         = 0;
17     GetLocalTime           glt         = new  GetLocalTime();
18     public static long   thr_id;
19
20     @SuppressWarnings("static-access")
21     void receiveFile() throws IOException, InterruptedException {
22         MainWindows.jta.setText("");
23         if(filePath.equals("")){
24             MainWindows.jta.append("【"+glt.getLocalTime()+"】    "+"服务启动失败......错误：文件存储路径无效或为空！\n");
25             MainWindows.jta.setCaretPosition(MainWindows.jta.getText().length());
26             Thread.currentThread().interrupt();
27         }
28         thr_id = Thread.currentThread().getId();
29         @SuppressWarnings("resource")
30         DatagramSocket dataSocket  =  new DatagramSocket(Port);
31         MainWindows.jta.append("【"+glt.getLocalTime()+"】    "+"服务准备启动......\n");
32         MainWindows.jta.setCaretPosition(MainWindows.jta.getText().length());
33         byte[] receiveByte;
34         DatagramPacket dataPacket;
35         @SuppressWarnings("resource")
36         DataOutputStream fileOut = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(filePath)));
37         MainWindows.jta.append("【"+glt.getLocalTime()+"】    "+"创建接收路径已完成！\n");
38         MainWindows.jta.setCaretPosition(MainWindows.jta.getText().length());
39         int i = 0;
40         MainWindows.jta.append("【"+glt.getLocalTime()+"】    "+"服务已经启动！\n");
41         MainWindows.jta.setCaretPosition(MainWindows.jta.getText().length());
42         MainWindows.jt3_1.setText("服务正在运行......");
43         MainWindows.jta.setCaretPosition(MainWindows.jta.getText().length());
44         int num1 = 0,num2 = 0;
45         double num3 = 0;
46         while(i == 0){
47             receiveByte = new byte[64512];
48             dataPacket = new DatagramPacket(receiveByte, receiveByte.length);
49             dataSocket.receive(dataPacket);
50             i = dataPacket.getLength();
51             if(i > 0){
52                 MainWindows.jta.append("【"+glt.getLocalTime()+"】    "+"捕获到数据包，大小为"+i/1024+"KB,数据存储已完成！\n");
53                 MainWindows.jta.setCaretPosition(MainWindows.jta.getText().length());
54                 fileOut.write(receiveByte,0,i);
55                 fileOut.flush();
56                 num3 = num3 + i/1024;
57                 i = 0;
58                 num2 = num2 + 1;
59             }
60             if(num2 > 0 && num2 == num1){
61                 MainWindows.jta.append("【"+glt.getLocalTime()+"】    "+"文件存储已完成，大小："+num3/1024+"M\n");
62                 MainWindows.jta.setCaretPosition(MainWindows.jta.getText().length());
63                 Thread.currentThread().sleep(10);
64                 MainWindows.jta.append("【"+glt.getLocalTime()+"】    "+"服务重载成功，正在运行......\n");
65                 MainWindows.jta.setCaretPosition(MainWindows.jta.getText().length());
66                 num2 = 0;
67             }
68             num1=num2;
69         }
70     }
71 }

　　窗体文件就不再详细展出了，运行结果如下图：