3.客户端

 

package sterning;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
public class ClientTest {
private ClientSocket cs = null;
private String ip = "localhost";// 设置成服务器IP
private int port = 8821;
private String sendMessage = "Windwos";
public ClientTest() {
try {
if (createConnection()) {
sendMessage();
getMessage();
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
private boolean createConnection() {
cs = new ClientSocket(ip， port);
try {
cs.CreateConnection();
System.out.print("连接服务器成功!" + " ");
return true;
} catch (Exception e) {
System.out.print("连接服务器失败!" + " ");
return false;
}
}
private void sendMessage() {
if (cs == null)
return;
try {
cs.sendMessage(sendMessage);
} catch (Exception e) {
System.out.print("发送消息失败!" + " ");
}
}
private void getMessage() {
if (cs == null)
return;
DataInputStream inputStream = null;
try {
inputStream = cs.getMessageStream();
} catch (Exception e) {
System.out.print("接收消息缓存错误 ");
return;
}
try {
//本地保存路径，文件名会自动从服务器端继承而来。
String savePath = "E:\";
int bufferSize = 8192;
byte[] buf = new byte[bufferSize];
int passedlen = 0;
long len=0;
savePath += inputStream.readUTF();
DataOutputStream fileOut = new DataOutputStream(new BufferedOutputStream(new BufferedOutputStream(new FileOutputStream(savePath))));
len = inputStream.readLong();
System.out.println("文件的长度为:" + len + " ");
System.out.println("开始接收文件!" + " ");
while (true) {
int read = 0;
if (inputStream != null) {
read = inputStream.read(buf);
}
passedlen += read;
if (read == -1) {
break;
}
//下面进度条本为图形界面的prograssBar做的，这里如果是打文件，可能会重复打印出一些相同的百分比
System.out.println("文件接收了" +  (passedlen * 100/ len) + "% ");
fileOut.write(buf， 0， read);
}
System.out.println("接收完成，文件存为" + savePath + " ");
fileOut.close();
} catch (Exception e) {
System.out.println("接收消息错误" + " ");
return;
}
}
public static void main(String arg[]) {
new ClientTest();
}
}

　　这实现了从服务器端向客户端发送文件的过程，当然，反过来，也一样.稍有不同.代码中对跨平台的细节没有实现，有时间或兴趣的朋友可以提供一下.