import?java.io.BufferedReader;
import?java.io.File;
import?java.io.FileOutputStream;
import?java.io.IOException;
import?java.io.OutputStream;
import?java.io.InputStream;
import?java.io.InputStreamReader;
import?java.io.PrintStream;
import?java.net.Socket;
import?java.net.SocketException;
import?java.net.UnknownHostException;
import?java.util.Scanner;

public?class?Client?{
	
	public?static?void?main（String[]?args）?{
		//?TODO?Auto-generated?method?stub
		
		try?{
			//鏈接服務器		
			//發送請求頭

			while（true）{
				Socket?s=new?Socket（“localhost“8888）;
				PrintStream?writer?=?new?PrintStream（s.getOutputStream（））;
				System.out.println（“請輸入下載文件“）;
				String?filename?=?new?Scanner（System.in）.nextLine（）;
				writer.println（“GET?/“+filename+“?HTTP/1.1“）;
				writer.println（“Host:localhost“）;
				writer.println（“connection:keep-alive“）;
				writer.println（）;
				writer.flush（）;
			
				//發送請求體
				InputStream?in=s.getInputStream（）;
				BufferedReader?reader?=?new?BufferedReader（new?InputStreamReader（in））;
				String?firstLineOfResponse?=?reader.readLine（）;//Content-Type:text/html
				String?secondLineOfResponse?=?reader.readLine（）;//Content-Length
				String?threeLineOfResponse?=?reader.readLine（）;//blank?line
				String?fourLineOfResponse?=?reader.readLine（）;//HTTP/1.1?200?OK
			
				//接收響應狀態
				if（（firstLineOfResponse.substring（9?12））.equals（“404“））{
				????//響應失敗
				????String?result?=?new?String（）;
				????String?line;
				????while（（line?=?reader.readLine（））?!=?null）{
				????	result?=?result+“\n“+line;?
				????}
				????System.out.println（result）;
				????reader.close（）;	
				????writer.close（）;
				}
				else{		
					System.out.println（“請輸入保存路徑“）;
					String?savelocation?=?new?Scanner（System.in）.nextLine（）;
					File?fl?=?new?File（savelocation）;
					if（!fl.exists（））{
						fl.createNewFile（）;
					}
					if（fl.exists（））{
						byte[]?b=new?byte[100000];
						OutputStream?out=new?FileOutputStream（savelocation）;
						int?len?=in.read（b）;
						while（len!=-1）
						{
							out.write（b?0?len）;
							len?=?in.read（b）;
						}
						in.close（）;
						out.close（）;
						writer.close（）;
					}
			????}
				s.close（）;
			}
		}
		catch（UnknownHostException?e）{
			e.printStackTrace（）;
		}catch（IOException?e）{
			e.printStackTrace（）;
		}
		
	}
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-01-19?11:20??實驗二\
?????目錄???????????0??2018-01-19?11:20??實驗二\實驗二代碼\
?????文件????????2413??2017-03-07?17:08??實驗二\實驗二代碼\Client.java
?????文件?????????590??2017-03-06?22:15??實驗二\實驗二代碼\Server.java
?????文件????????3894??2017-03-07?17:12??實驗二\實驗二代碼\ServerThread.java
?????文件????????2866??2017-03-07?12:30??實驗二\實驗二代碼\ZipCompressor.java
?????文件????12956667??2017-03-07?21:31??實驗二\董卓然實驗二http錄屏.mp4