20145315 《Java程序设计》实验五实验报告
实验五 Java网络编程
我负责服务器部分，王嘉澜负责客户端部分：http://www.cnblogs.com/SJZGM10/p/5467368.html
网络编程技术
- 客户端步骤：
- 建立网络连接
- 交换数据：加密使用AES或者DES/AES或者DES加密密钥key并发送
- 关闭网络连接
- 服务器端步骤：
- 监听端口
- 获得连接
- 交换数据：使用服务器的公钥加密/公钥算法使用RSA或DH/检验发送信息的完整性使用MD5或者SHA3
- 关闭连接
代码：
public static void main(String args[]) {
ServerSocket sc = null;
ServerSocket sc1 = null;
Socket socket=null;
Socket socket1=null;
try {
sc= new ServerSocket(1125);
sc1= new ServerSocket(1126);
System.out.println("端口号:" + sc.getLocalPort());
System.out.println("服务器1已经启动...");
System.out.println("端口号:" + sc1.getLocalPort());
System.out.println("服务器2已经启动...");
socket = sc.accept();
System.out.println("已经建立连接");
socket1 = sc1.accept();
System.out.println("已经建立1连接");
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
BufferedReader in1 = new BufferedReader(new InputStreamReader(socket1.getInputStream()));
System.out.print("已接收\n");
PrintWriter out=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);
String aline=in.readLine();
String aline1=in1.readLine();
System.out.print("写入文件中...\n");
byte [] bytes = aline.getBytes("GB2312");
byte [] bytes1 = aline1.getBytes("GB2312");
aline = new String(bytes, "GB2312");
aline1 = new String(bytes1, "GB2312");
FileOutputStream s=new FileOutputStream("key1.dat");
s.write(bytes);
FileOutputStream s1=new FileOutputStream("SEnc.dat");
s1.write(bytes1);
System.out.print("已写入文件\n");
FileInputStream f=new FileInputStream("key1.dat");
ObjectInputStream b=new ObjectInputStream(f);
Key k=(Key)b.readObject( );
byte[ ] kb=k.getEncoded( );
FileOutputStream f2=new FileOutputStream("keykb1.dat");
f2.write(kb);
System.out.print("生成解密密钥\n");
for(int i=0;i<kb.length;i++){
}
FileInputStream a=new FileInputStream("SEnc.dat");
int num=a.available();
byte[ ] ctext=new byte[num];
a.read(ctext);
FileInputStream f1=new FileInputStream("keykb1.dat");
int num2=f1.available();
byte[ ] keykb=new byte[num2];
f1.read(keykb);
SecretKeySpec e=new SecretKeySpec(keykb,"DESede");
Cipher cp=Cipher.getInstance("DESede");
cp.init(Cipher.DECRYPT_MODE, k);
byte []ptext=cp.doFinal(ctext);
String p=new String(ptext,"GB2312");
System.out.print("解密中...\n");
System.out.println(p);
System.out.println("从客户端接收到信息为："+p);
out.println(p);
out.close();
in.close();
sc.close();
} catch (Exception e) {
System.out.println(e);
}
}
}