20165230 《Java程序設(shè)計》實驗五《網(wǎng)絡(luò)編程與安全》實驗報告
一、實驗報告封面
課程：Java程序設(shè)計 班級：1652班 姓名：田坤燁 學(xué)號：20165230 成績：
指導(dǎo)教師：婁嘉鵬 實驗日期：2018年5月28日
實驗時間：13:45 - 15:25
實驗序號：實驗五 實驗名稱：網(wǎng)絡(luò)編程與安全
實驗要求：
沒有Linux基礎(chǔ)的同學(xué)建議先學(xué)習(xí)《Linux基礎(chǔ)入門（新版）》《Vim編輯器》 課程；完成實驗、撰寫實驗報告，注意實驗報告重點是運行結(jié)果，遇到的問題(工具查找，安裝，使用，程序的編輯，調(diào)試，運行等)、解決辦法（空洞的方法如“查網(wǎng)絡(luò)”、“問同學(xué)”、“看書”等一律得0分）以及分析（從中可以得到什么啟示，有什么收獲，教訓(xùn)等）；實驗報告中統(tǒng)計自己的PSP(Personal Software Process)時間；嚴禁抄襲。二、實驗內(nèi)容及步驟
（一）實現(xiàn)中綴表達式轉(zhuǎn)后綴表達式并實現(xiàn)后綴表達式求值的功能
結(jié)對實現(xiàn)中綴表達式轉(zhuǎn)后綴表達式的功能 MyBC.java結(jié)對實現(xiàn)從上面功能中獲取的表達式中實現(xiàn)后綴表達式求值的功能,調(diào)用MyDC.java上傳測試代碼運行結(jié)果截圖和碼云鏈接MyBC.java
import java.util.Stack;
import java.util.StringTokenizer;public class MyBC{private Stack<Character> stack1;public char Precede(char a,char b){if(a=='#')if(b!='#')return '<';elsereturn '=';if(a==')')return '>';if(a=='(')if(b!=')')return '<';elsereturn '=';if(a=='/'||a=='*')if(b!='(')return '>';elsereturn '<';if(a=='-'||a=='+')if(b!='*'&&b!='/'&&b!='(')return '>';elsereturn '<';return '>';}public MyBC() {stack1 = new Stack<Character>();stack1.push('#');}public String turn(String expr) {int result = 0;String token;char topelem,optr;char[] exper1 = new char[100];int i = 0;StringTokenizer tokenizer = new StringTokenizer (expr);while (tokenizer.hasMoreTokens()){token = tokenizer.nextToken();//如果是運算符，調(diào)用isOperatorif (isOperator(token)){//調(diào)用Precede比較優(yōu)先級topelem=stack1.peek();optr = token.charAt(0);if(Precede(topelem,optr)=='<'){stack1.push(optr);}else if(Precede(topelem,optr)=='='){optr =stack1.pop();exper1[i++] = optr;exper1[i++] = ' ';}else if(Precede(topelem,optr)=='>'){optr =stack1.pop();//從運算符棧中退出棧頂元素并放入后綴表達式exper1exper1[i++] = optr;exper1[i++] = ' ';}}//如果是(則入棧else if(token.equals("(")) {optr = token.charAt(0);stack1.push(optr);}//如果是）則退棧直到出現(xiàn)第一個（else if(token.equals(")")) {optr = stack1.pop();while(optr!='('){exper1[i++] = optr;exper1[i++] = ' ';optr = stack1.pop();}}else//如果是操作數(shù)//操作數(shù)放入后綴表達式exper1{optr = token.charAt(0);//System.out.println(optr);exper1[i++]=optr;exper1[i++] = ' ';}}while(!stack1.isEmpty()){optr = stack1.pop();if(optr!='#'){exper1[i++] = optr;exper1[i++] = ' ';}}//System.out.println(exper1);return ToString(exper1);}//@Overrideprivate boolean isOperator(String token){return (token.equals("+") || token.equals("-") ||token.equals("*") || token.equals("/") );}public static String ToString(char[] exper1){int length = exper1.length;String str=" ";for(int i=0;i<length;i++){str=str+exper1[i];}return str;}}
（二） 基于Java Socket實現(xiàn)客戶端/服務(wù)器功能
基于Java Socket實現(xiàn)客戶端/服務(wù)器功能，傳輸方式用TCP客戶端讓用戶輸入中綴表達式，然后把中綴表達式調(diào)用MyBC.java的功能轉(zhuǎn)化為后綴表達式，把后綴表達式通過網(wǎng)絡(luò)發(fā)送給服務(wù)器服務(wù)器接收到后綴表達式，調(diào)用MyDC.java的功能計算后綴表達式的值，把結(jié)果發(fā)送給客戶端客戶端顯示服務(wù)器發(fā)送過來的結(jié)果上傳測試結(jié)果截圖和碼云鏈接import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;public class Server {public static final int PORT = 12345;//監(jiān)聽的端口號public static void main(String[] args) {System.out.println("服務(wù)器啟動...\n");Server server = new Server();server.init();}public void init() {try {ServerSocket serverSocket = new ServerSocket(PORT);while (true) {// 一旦有堵塞, 則表示服務(wù)器與客戶端獲得了連接Socket client = serverSocket.accept();// 處理這次連接new HandlerThread(client);}} catch (Exception e) {System.out.println("服務(wù)器異常: " + e.getMessage());}}private class HandlerThread implements Runnable {private Socket socket;public HandlerThread(Socket client) {socket = client;new Thread(this).start();}public void run() {try {// 讀取客戶端數(shù)據(jù)DataInputStream input = new DataInputStream(socket.getInputStream());String clientInputStr = input.readUTF();//這里要注意和客戶端輸出流的寫方法對應(yīng),否則會拋 EOFException// 處理客戶端數(shù)據(jù)System.out.println("客戶端發(fā)過來的內(nèi)容:" + clientInputStr);MyDC evalute = new MyDC();int result = evalute.evaluate(clientInputStr);// 向客戶端回復(fù)信息DataOutputStream out = new DataOutputStream(socket.getOutputStream());System.out.print("計算結(jié)果:\t");// 發(fā)送鍵盤輸入的一行//String s = new BufferedReader(new InputStreamReader(System.in)).readLine();out.writeUTF(String.valueOf(result));out.close();input.close();} catch (Exception e) {System.out.println("服務(wù)器 run 異常: " + e.getMessage());} finally {if (socket != null) {try {socket.close();} catch (Exception e) {socket = null;System.out.println("服務(wù)端 finally 異常:" + e.getMessage());}}}}}
}
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;public class Client {public static final String IP_ADDR = "127.0.0.1";//服務(wù)器地址public static final int PORT = 12345;//服務(wù)器端口號public static void main(String[] args) {System.out.println("客戶端啟動...");System.out.println("當接收到服務(wù)器端字符為 \"OK\" 的時候, 客戶端將終止\n");while (true) {Socket socket = null;try {socket = new Socket(IP_ADDR, PORT);DataInputStream input = new DataInputStream(socket.getInputStream());DataOutputStream out = new DataOutputStream(socket.getOutputStream());System.out.print("請輸入: \t");String str = new BufferedReader(new InputStreamReader(System.in)).readLine();MyBC turner = new MyBC();String str1 = turner.turn(str);int length=0,i=0;while(str1.charAt(i)!='\0'){length++;i++;}String str2 = str1.substring(1,length-1);out.writeUTF(str2);String ret = input.readUTF();System.out.println("服務(wù)器端返回過來的是: " + ret);out.close();input.close();} catch (Exception e) {System.out.println("客戶端異常:" + e.getMessage());} finally {if (socket != null) {try {socket.close();} catch (IOException e) {socket = null;System.out.println("客戶端 finally 異常:" + e.getMessage());}}}}}
}
（三）加密結(jié)對編程
基于Java Socket實現(xiàn)客戶端/服務(wù)器功能，傳輸方式用TCP客戶端讓用戶輸入中綴表達式，然后把中綴表達式調(diào)用MyBC.java的功能轉(zhuǎn)化為后綴表達式，把后綴表達式用3DES或AES算法加密后通過網(wǎng)絡(luò)把密文發(fā)送給服務(wù)器服務(wù)器接收到后綴表達式表達式后，進行解密（和客戶端協(xié)商密鑰，可以用數(shù)組保存），然后調(diào)用MyDC.java的功能計算后綴表達式的值，把結(jié)果發(fā)送給客戶端客戶端顯示服務(wù)器發(fā)送過來的結(jié)果上傳測試結(jié)果截圖和碼云鏈接import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;public class ServerReceive{public static final int PORT = 12345;//監(jiān)聽的端口號public static void main(String[] args) {System.out.println("服務(wù)器啟動...\n");Server server = new Server();server.init();}public void init() {try {ServerSocket serverSocket = new ServerSocket(PORT);while (true) {// 一旦有堵塞, 則表示服務(wù)器與客戶端獲得了連接Socket client = serverSocket.accept();// 處理這次連接new HandlerThread(client);}} catch (Exception e) {System.out.println("服務(wù)器異常: " + e.getMessage());}}private class HandlerThread implements Runnable {private Socket socket;public HandlerThread(Socket client) {socket = client;new Thread(this).start();}public void run() {try {/*讀取客戶端數(shù)據(jù)*/DataInputStream input = new DataInputStream(socket.getInputStream());String clientInputStr = input.readUTF();/*處理客戶端數(shù)據(jù)*/System.out.println("客戶端發(fā)過來的內(nèi)容:" + clientInputStr);MyDC evalute = new MyDC();SDec sDec = new SDec();//解密int result = evalute.evaluate(clientInputStr);/* 向客戶端回復(fù)信息*/DataOutputStream out = new DataOutputStream(socket.getOutputStream());System.out.print("計算結(jié)果:\t");/*發(fā)送鍵盤輸入的一行*/out.writeUTF(String.valueOf(result));out.close();input.close();} catch (Exception e) {System.out.println("服務(wù)器 run 異常: " + e.getMessage());} finally {if (socket != null) {try {socket.close();} catch (Exception e) {socket = null;System.out.println("服務(wù)端 finally 異常:" + e.getMessage());}}}}}
}
import java.io.BufferedReader;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.net.Socket;public class Client2 {public static final String IP_ADDR = "127.0.0.1";//服務(wù)器地址public static final int PORT = 12345;//服務(wù)器端口號public static void main(String[] args) {System.out.println("客戶端啟動...");System.out.println("當接收到服務(wù)器端字符為 \"OK\" 的時候, 客戶端將終止\n");while (true) {Socket socket = null;try {//創(chuàng)建一個流套接字并將其連接到指定主機上的指定端口號socket = new Socket(IP_ADDR, PORT);//讀取服務(wù)器端數(shù)據(jù)DataInputStream input = new DataInputStream(socket.getInputStream());//向服務(wù)器端發(fā)送數(shù)據(jù)DataOutputStream out = new DataOutputStream(socket.getOutputStream());System.out.print("請輸入: \t");String str = new BufferedReader(new InputStreamReader(System.in)).readLine();MyBC turner = new MyBC();Skey_DES skey_des = new Skey_DES();skey_des.key_DES();Skey_kb skey_kb = new Skey_kb();skey_kb.key();/*產(chǎn)生密鑰*/SEnc sEnc = new SEnc();String str1 = turner.turn(str);int length=0,i=0;while(str1.charAt(i)!='\0'){length++;i++;}String str2 = str1.substring(1,length-1);out.writeUTF(str2);String ret = input.readUTF();System.out.println("服務(wù)器端返回過來的是: " + ret);out.close();input.close();} catch (Exception e) {System.out.println("客戶端異常:" + e.getMessage());} finally {if (socket != null) {try {socket.close();} catch (IOException e) {socket = null;System.out.println("客戶端 finally 異常:" + e.getMessage());}}}}}
}
（四）客戶端和服務(wù)器用DH算法進行3DES或AES算法的密鑰交換
- 服務(wù)器和客戶端分別運行Key_DH.java代碼產(chǎn)生各自的公鑰和私鑰，然后將公鑰通過網(wǎng)絡(luò)發(fā)送給對方，，客戶端和服務(wù)器利用對方發(fā)送的公鑰和自己私鑰運行 KeyAgree.java生成相同的共享密鑰，各自利用共享密鑰進行加解密工作。
Key_DH.java
import java.io.*;
import java.math.*;
import java.security.*;
import java.security.spec.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import javax.crypto.interfaces.*;public class Key_DH{private static final byte skip1024ModulusBytes[] = {(byte)0xF4, (byte)0x88, (byte)0xFD, (byte)0x58,(byte)0x4E, (byte)0x49, (byte)0xDB, (byte)0xCD,(byte)0x20, (byte)0xB4, (byte)0x9D, (byte)0xE4,(byte)0x91, (byte)0x07, (byte)0x36, (byte)0x6B,(byte)0x33, (byte)0x6C, (byte)0x38, (byte)0x0D,(byte)0x45, (byte)0x1D, (byte)0x0F, (byte)0x7C,(byte)0x88, (byte)0xB3, (byte)0x1C, (byte)0x7C,(byte)0x5B, (byte)0x2D, (byte)0x8E, (byte)0xF6,(byte)0xF3, (byte)0xC9, (byte)0x23, (byte)0xC0,(byte)0x43, (byte)0xF0, (byte)0xA5, (byte)0x5B,(byte)0x18, (byte)0x8D, (byte)0x8E, (byte)0xBB,(byte)0x55, (byte)0x8C, (byte)0xB8, (byte)0x5D,(byte)0x38, (byte)0xD3, (byte)0x34, (byte)0xFD,(byte)0x7C, (byte)0x17, (byte)0x57, (byte)0x43,(byte)0xA3, (byte)0x1D, (byte)0x18, (byte)0x6C,(byte)0xDE, (byte)0x33, (byte)0x21, (byte)0x2C,(byte)0xB5, (byte)0x2A, (byte)0xFF, (byte)0x3C,(byte)0xE1, (byte)0xB1, (byte)0x29, (byte)0x40,(byte)0x18, (byte)0x11, (byte)0x8D, (byte)0x7C,(byte)0x84, (byte)0xA7, (byte)0x0A, (byte)0x72,(byte)0xD6, (byte)0x86, (byte)0xC4, (byte)0x03,(byte)0x19, (byte)0xC8, (byte)0x07, (byte)0x29,(byte)0x7A, (byte)0xCA, (byte)0x95, (byte)0x0C,(byte)0xD9, (byte)0x96, (byte)0x9F, (byte)0xAB,(byte)0xD0, (byte)0x0A, (byte)0x50, (byte)0x9B,(byte)0x02, (byte)0x46, (byte)0xD3, (byte)0x08,(byte)0x3D, (byte)0x66, (byte)0xA4, (byte)0x5D,(byte)0x41, (byte)0x9F, (byte)0x9C, (byte)0x7C,(byte)0xBD, (byte)0x89, (byte)0x4B, (byte)0x22,(byte)0x19, (byte)0x26, (byte)0xBA, (byte)0xAB,(byte)0xA2, (byte)0x5E, (byte)0xC3, (byte)0x55,(byte)0xE9, (byte)0x2F, (byte)0x78, (byte)0xC7};// The SKIP 1024 bit modulusprivate static final BigInteger skip1024Modulus= new BigInteger(1, skip1024ModulusBytes);// The base used with the SKIP 1024 bit modulusprivate static final BigInteger skip1024Base = BigInteger.valueOf(2);public static void main(String args[ ]) throws Exception{DHParameterSpec DHP=new DHParameterSpec(skip1024Modulus,skip1024Base);KeyPairGenerator kpg= KeyPairGenerator.getInstance("DH");kpg.initialize(DHP);KeyPair kp=kpg.genKeyPair();PublicKey pbk=kp.getPublic();PrivateKey prk=kp.getPrivate();// 保存公鑰FileOutputStream f1=new FileOutputStream(args[0]);ObjectOutputStream b1=new ObjectOutputStream(f1);b1.writeObject(pbk);// 保存私鑰FileOutputStream f2=new FileOutputStream(args[1]);ObjectOutputStream b2=new ObjectOutputStream(f2);b2.writeObject(prk);}
}
（五）解密后計算明文的MD5值，和客戶端傳來的MD5進行比較，一致則調(diào)用MyDC.java的功能計算后綴表達式的值，把結(jié)果發(fā)送給客戶端
import java.io.*;
import java.net.*;
import java.security.MessageDigest;
public class Server5 {public static void main(String args[]) {MyDC evalute = new MyDC();SDec sDec = new SDec();try {ServerSocket server = null;try {server = new ServerSocket(12345);//創(chuàng)建一個ServerSocket在端口4700監(jiān)聽客戶請求} catch (Exception e) {System.out.println("can not listen to:" + e);//出錯，打印出錯信息}Socket socket = null;try {socket = server.accept();//使用accept()阻塞等待客戶請求，有客戶//請求到來則產(chǎn)生一個Socket對象，并繼續(xù)執(zhí)行} catch (Exception e) {System.out.println("Error." + e);//出錯，打印出錯信息}String line;BufferedReader is = new BufferedReader(new InputStreamReader(socket.getInputStream()));//由Socket對象得到輸入流，并構(gòu)造相應(yīng)的BufferedReader對象PrintWriter os = new PrintWriter(socket.getOutputStream());//由Socket對象得到輸出流，并構(gòu)造PrintWriter對象BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));//由系統(tǒng)標準輸入設(shè)備構(gòu)造BufferedReader對象//使用Hash函數(shù)檢測明文完整性String x = sin.readLine();MessageDigest m2 = MessageDigest.getInstance("MD5");//使用MD5算法返回實現(xiàn)指定摘要算法的 MessageDigest對象m2.update(x.getBytes());byte a[] = m2.digest();String result = "";for (int i = 0; i < a.length; i++) {result += Integer.toHexString((0x000000ff & a[i]) | 0xffffff00).substring(6);}System.out.println(result);String match = is.readLine();if (match.equals(result)) {System.out.println("匹配成功");}System.out.println("Client:" + is.readLine());//在標準輸出上打印從客戶端讀入的字符串line = sin.readLine();//從標準輸入讀入一字符串while (!line.equals("bye")) {//如果該字符串為 "bye"，則停止循環(huán)os.println(evalute.evaluate(line));//向客戶端輸出該字符串os.flush();//刷新輸出流，使Client馬上收到該字符串System.out.println("Server:" + evalute.evaluate(line));//在系統(tǒng)標準輸出上打印讀入的字符串System.out.println("Client:" + is.readLine());//從Client讀入一字符串，并打印到標準輸出上line = sin.readLine();//從系統(tǒng)標準輸入讀入一字符串} //繼續(xù)循環(huán)os.close(); //關(guān)閉Socket輸出流is.close(); //關(guān)閉Socket輸入流socket.close(); //關(guān)閉Socketserver.close(); //關(guān)閉ServerSocket} catch (Exception e) {System.out.println("Error:" + e);
//出錯，打印出錯信息}}
}
import java.io.*;import java.net.*;import java.security.MessageDigest;
/*** Created by lxkj on 2017/6/2.*/public class Client5 {public static void main(String args[]) throws Exception {MyBC turner = new MyBC();Skey_DES skey_des = new Skey_DES();skey_des.key_DES();Skey_kb skey_kb = new Skey_kb();skey_kb.key();/*產(chǎn)生密鑰*/SEnc sEnc = new SEnc();try {Socket socket = new Socket("127.0.0.1", 12345);
//向本機的4700端口發(fā)出客戶請求BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));
//由系統(tǒng)標準輸入設(shè)備構(gòu)造BufferedReader對象PrintWriter os = new PrintWriter(socket.getOutputStream());//由Socket對象得到輸出流，并構(gòu)造PrintWriter對象BufferedReader is = new BufferedReader(new InputStreamReader(socket.getInputStream()));
//由Socket對象得到輸入流，并構(gòu)造相應(yīng)的BufferedReader對象String readline;System.out.println("請輸入：");readline =sin.readLine();//從系統(tǒng)標準輸入讀入一字符串String x = readline;// 將客戶端明文的Hash值傳送給服務(wù)器MessageDigest m2 = MessageDigest.getInstance("MD5");m2.update(x.getBytes());byte a[] = m2.digest();String result = "";for (int i = 0; i < a.length; i++) {result += Integer.toHexString((0x000000ff & a[i]) | 0xffffff00).substring(6);}System.out.println("明文MD5值為:" + result);os.println(result);//通過網(wǎng)絡(luò)將明文的Hash函數(shù)值傳送到服務(wù)器// String str = is.readLine();// 從網(wǎng)絡(luò)輸入流讀取結(jié)果System.out.println("從服務(wù)器接收到的結(jié)果為：" + result); // 輸出服務(wù)器返回的結(jié)果while (!readline.equals("ok")) {//若從標準輸入讀入的字符串為 "ok"則停止循環(huán)readline = SEnc.Enc(turner.turn(readline));os.println(readline);/*把中綴表達式調(diào)用MyBC.java的功能轉(zhuǎn)化為后綴表達式，把后綴表達式用3DES加密后通過網(wǎng)絡(luò)發(fā)送給服務(wù)器*///將從系統(tǒng)標準輸入讀入的字符串輸出到Serveros.flush();//刷新輸出流，使Server馬上收到該字符串System.out.println("Client:" + readline);//在系統(tǒng)標準輸出上打印讀入的字符串System.out.println("Server:" + is.readLine());//從Server讀入一字符串，并打印到標準輸出上readline = sin.readLine(); //從系統(tǒng)標準輸入讀入一字符串} //繼續(xù)循環(huán)os.close(); //關(guān)閉Socket輸出流is.close(); //關(guān)閉Socket輸入流socket.close(); //關(guān)閉Socket} catch (Exception e) {System.out.println("Error" + e); //出錯，則打印出錯信息}}}
三、實驗遇到的問題
四、PSP時間
| 需求分析 | 30min | 12% |
| 設(shè)計 | 40min | 15% |
| 代碼實現(xiàn) | 90min | 34% |
| 測試 | 45min | 17% |
| 分析總結(jié) | 60min | 23% |
六、代碼鏈接
七、參考資料
- 棧的應(yīng)用
- Java 密碼學(xué)算法
轉(zhuǎn)載于:https://www.cnblogs.com/tiankunye/p/9097237.html
總結(jié)
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