java的网络编程设计报告_20165230 《Java程序设计》实验五《网络编程与安全》实验报告...
20165230 《Java程序設(shè)計(jì)》實(shí)驗(yàn)五《網(wǎng)絡(luò)編程與安全》實(shí)驗(yàn)報(bào)告
一、實(shí)驗(yàn)報(bào)告封面
課程：Java程序設(shè)計(jì) 班級(jí)：1652班 姓名：田坤燁 學(xué)號(hào)：20165230 成績(jī)：
指導(dǎo)教師：婁嘉鵬 實(shí)驗(yàn)日期：2018年5月28日
實(shí)驗(yàn)時(shí)間：13:45 - 15:25
實(shí)驗(yàn)序號(hào)：實(shí)驗(yàn)五 實(shí)驗(yàn)名稱(chēng)：網(wǎng)絡(luò)編程與安全
實(shí)驗(yàn)要求：
沒(méi)有Linux基礎(chǔ)的同學(xué)建議先學(xué)習(xí)《Linux基礎(chǔ)入門(mén)(新版)》《Vim編輯器》 課程；
完成實(shí)驗(yàn)、撰寫(xiě)實(shí)驗(yàn)報(bào)告，注意實(shí)驗(yàn)報(bào)告重點(diǎn)是運(yùn)行結(jié)果，遇到的問(wèn)題(工具查找，安裝，使用，程序的編輯，調(diào)試，運(yùn)行等)、解決辦法(空洞的方法如“查網(wǎng)絡(luò)”、“問(wèn)同學(xué)”、“看書(shū)”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(shí)驗(yàn)報(bào)告中統(tǒng)計(jì)自己的PSP(Personal Software Process)時(shí)間；
嚴(yán)禁抄襲。
二、實(shí)驗(yàn)內(nèi)容及步驟
(一)實(shí)現(xiàn)中綴表達(dá)式轉(zhuǎn)后綴表達(dá)式并實(shí)現(xiàn)后綴表達(dá)式求值的功能
實(shí)驗(yàn)內(nèi)容
結(jié)對(duì)實(shí)現(xiàn)中綴表達(dá)式轉(zhuǎn)后綴表達(dá)式的功能 MyBC.java
結(jié)對(duì)實(shí)現(xiàn)從上面功能中獲取的表達(dá)式中實(shí)現(xiàn)后綴表達(dá)式求值的功能,調(diào)用MyDC.java
上傳測(cè)試代碼運(yùn)行結(jié)果截圖和碼云鏈接
代碼如下
MyBC.java
import java.util.Stack;
import java.util.StringTokenizer;
public class MyBC{
private Stack stack1;
public char Precede(char a,char b)
{
if(a=='#')
if(b!='#')
return '
else
return '=';
if(a==')')
return '>';
if(a=='(')
if(b!=')')
return '
else
return '=';
if(a=='/'||a=='*')
if(b!='(')
return '>';
else
return '
if(a=='-'||a=='+')
if(b!='*'&&b!='/'&&b!='(')
return '>';
else
return '
return '>';
}
public MyBC() {
stack1 = new Stack();
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(yùn)算符，調(diào)用isOperator
if (isOperator(token))
{
//調(diào)用Precede比較優(yōu)先級(jí)
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(yùn)算符棧中退出棧頂元素并放入后綴表達(dá)式exper1
exper1[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(gè)(
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(dá)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);
}
//@Override
private 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
{
str=str+exper1[i];
}
return str;
}
}
MyBC測(cè)試結(jié)果截圖
(二) 基于Java Socket實(shí)現(xiàn)客戶(hù)端/服務(wù)器功能
基于Java Socket實(shí)現(xiàn)客戶(hù)端/服務(wù)器功能，傳輸方式用TCP
客戶(hù)端讓用戶(hù)輸入中綴表達(dá)式，然后把中綴表達(dá)式調(diào)用MyBC.java的功能轉(zhuǎn)化為后綴表達(dá)式，把后綴表達(dá)式通過(guò)網(wǎng)絡(luò)發(fā)送給服務(wù)器
服務(wù)器接收到后綴表達(dá)式，調(diào)用MyDC.java的功能計(jì)算后綴表達(dá)式的值，把結(jié)果發(fā)送給客戶(hù)端
客戶(hù)端顯示服務(wù)器發(fā)送過(guò)來(lái)的結(jié)果
上傳測(cè)試結(jié)果截圖和碼云鏈接
服務(wù)器端代碼(由我負(fù)責(zé))
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(tīng)的端口號(hào)
public static void main(String[] args) {
System.out.println("服務(wù)器啟動(dòng)...\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(hù)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(hù)端數(shù)據(jù)
DataInputStream input = new DataInputStream(socket.getInputStream());
String clientInputStr = input.readUTF();//這里要注意和客戶(hù)端輸出流的寫(xiě)方法對(duì)應(yīng),否則會(huì)拋 EOFException
// 處理客戶(hù)端數(shù)據(jù)
System.out.println("客戶(hù)端發(fā)過(guò)來(lái)的內(nèi)容:" + clientInputStr);
MyDC evalute = new MyDC();
int result = evalute.evaluate(clientInputStr);
// 向客戶(hù)端回復(fù)信息
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
System.out.print("計(jì)算結(jié)果:\t");
// 發(fā)送鍵盤(pán)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());
}
}
}
}
}
}
運(yùn)行截圖
客戶(hù)端代碼(由搭檔負(fù)責(zé))
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(hào)
public static void main(String[] args) {
System.out.println("客戶(hù)端啟動(dòng)...");
System.out.println("當(dāng)接收到服務(wù)器端字符為 \"OK\" 的時(shí)候, 客戶(hù)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(qǐng)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(guò)來(lái)的是: " + ret);
out.close();
input.close();
} catch (Exception e) {
System.out.println("客戶(hù)端異常:" + e.getMessage());
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
socket = null;
System.out.println("客戶(hù)端 finally 異常:" + e.getMessage());
}
}
}
}
}
}
運(yùn)行截圖
(三)加密結(jié)對(duì)編程
基于Java Socket實(shí)現(xiàn)客戶(hù)端/服務(wù)器功能，傳輸方式用TCP
客戶(hù)端讓用戶(hù)輸入中綴表達(dá)式，然后把中綴表達(dá)式調(diào)用MyBC.java的功能轉(zhuǎn)化為后綴表達(dá)式，把后綴表達(dá)式用3DES或AES算法加密后通過(guò)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(dá)式表達(dá)式后，進(jìn)行解密(和客戶(hù)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(jì)算后綴表達(dá)式的值，把結(jié)果發(fā)送給客戶(hù)端
客戶(hù)端顯示服務(wù)器發(fā)送過(guò)來(lái)的結(jié)果
上傳測(cè)試結(jié)果截圖和碼云鏈接
服務(wù)器端(由我負(fù)責(zé))
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(tīng)的端口號(hào)
public static void main(String[] args) {
System.out.println("服務(wù)器啟動(dòng)...\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(hù)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(hù)端數(shù)據(jù)*/
DataInputStream input = new DataInputStream(socket.getInputStream());
String clientInputStr = input.readUTF();
/*處理客戶(hù)端數(shù)據(jù)*/
System.out.println("客戶(hù)端發(fā)過(guò)來(lái)的內(nèi)容:" + clientInputStr);
MyDC evalute = new MyDC();
SDec sDec = new SDec();//解密
int result = evalute.evaluate(clientInputStr);
/* 向客戶(hù)端回復(fù)信息*/
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
System.out.print("計(jì)算結(jié)果:\t");
/*發(fā)送鍵盤(pán)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());
}
}
}
}
}
}
運(yùn)行截圖
客戶(hù)端代碼(由搭檔負(fù)責(zé))
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(hào)
public static void main(String[] args) {
System.out.println("客戶(hù)端啟動(dòng)...");
System.out.println("當(dāng)接收到服務(wù)器端字符為 \"OK\" 的時(shí)候, 客戶(hù)端將終止\n");
while (true) {
Socket socket = null;
try {
//創(chuàng)建一個(gè)流套接字并將其連接到指定主機(jī)上的指定端口號(hào)
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(qǐng)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(guò)來(lái)的是: " + ret);
out.close();
input.close();
} catch (Exception e) {
System.out.println("客戶(hù)端異常:" + e.getMessage());
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
socket = null;
System.out.println("客戶(hù)端 finally 異常:" + e.getMessage());
}
}
}
}
}
}
運(yùn)行截圖
(四)客戶(hù)端和服務(wù)器用DH算法進(jìn)行3DES或AES算法的密鑰交換
服務(wù)器和客戶(hù)端分別運(yùn)行Key_DH.java代碼產(chǎn)生各自的公鑰和私鑰，然后將公鑰通過(guò)網(wǎng)絡(luò)發(fā)送給對(duì)方，，客戶(hù)端和服務(wù)器利用對(duì)方發(fā)送的公鑰和自己私鑰運(yùn)行 KeyAgree.java生成相同的共享密鑰，各自利用共享密鑰進(jìn)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 modulus
private static final BigInteger skip1024Modulus
= new BigInteger(1, skip1024ModulusBytes);
// The base used with the SKIP 1024 bit modulus
private 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);
}
}
運(yùn)行截圖
(五)解密后計(jì)算明文的MD5值，和客戶(hù)端傳來(lái)的MD5進(jìn)行比較，一致則調(diào)用MyDC.java的功能計(jì)算后綴表達(dá)式的值，把結(jié)果發(fā)送給客戶(hù)端
服務(wù)器端：
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(gè)ServerSocket在端口4700監(jiān)聽(tīng)客戶(hù)請(qǐng)求
} catch (Exception e) {
System.out.println("can not listen to:" + e);
//出錯(cuò)，打印出錯(cuò)信息
}
Socket socket = null;
try {
socket = server.accept();
//使用accept()阻塞等待客戶(hù)請(qǐng)求，有客戶(hù)
//請(qǐng)求到來(lái)則產(chǎn)生一個(gè)Socket對(duì)象，并繼續(xù)執(zhí)行
} catch (Exception e) {
System.out.println("Error." + e);
//出錯(cuò)，打印出錯(cuò)信息
}
String line;
BufferedReader is = new BufferedReader(new InputStreamReader(socket.getInputStream()));
//由Socket對(duì)象得到輸入流，并構(gòu)造相應(yīng)的BufferedReader對(duì)象
PrintWriter os = new PrintWriter(socket.getOutputStream());
//由Socket對(duì)象得到輸出流，并構(gòu)造PrintWriter對(duì)象
BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));
//由系統(tǒng)標(biāo)準(zhǔn)輸入設(shè)備構(gòu)造BufferedReader對(duì)象
//使用Hash函數(shù)檢測(cè)明文完整性
String x = sin.readLine();
MessageDigest m2 = MessageDigest.getInstance("MD5");
//使用MD5算法返回實(shí)現(xiàn)指定摘要算法的 MessageDigest對(duì)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(biāo)準(zhǔn)輸出上打印從客戶(hù)端讀入的字符串
line = sin.readLine();
//從標(biāo)準(zhǔn)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(hù)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(biāo)準(zhǔn)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(biāo)準(zhǔn)輸出上
line = sin.readLine();
//從系統(tǒng)標(biāo)準(zhǔn)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
server.close(); //關(guān)閉ServerSocket
} catch (Exception e) {
System.out.println("Error:" + e);
//出錯(cuò)，打印出錯(cuò)信息
}
}
}
客戶(hù)端
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(jī)的4700端口發(fā)出客戶(hù)請(qǐng)求
BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));
//由系統(tǒng)標(biāo)準(zhǔn)輸入設(shè)備構(gòu)造BufferedReader對(duì)象
PrintWriter os = new PrintWriter(socket.getOutputStream());
//由Socket對(duì)象得到輸出流，并構(gòu)造PrintWriter對(duì)象
BufferedReader is = new BufferedReader(new InputStreamReader(socket.getInputStream()));
//由Socket對(duì)象得到輸入流，并構(gòu)造相應(yīng)的BufferedReader對(duì)象
String readline;
System.out.println("請(qǐng)輸入：");
readline =sin.readLine();
//從系統(tǒng)標(biāo)準(zhǔn)輸入讀入一字符串
String x = readline;
// 將客戶(hù)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(guò)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(biāo)準(zhǔn)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(dá)式調(diào)用MyBC.java的功能轉(zhuǎn)化為后綴表達(dá)式，把后綴表達(dá)式用3DES加密后通過(guò)網(wǎng)絡(luò)發(fā)送給服務(wù)器*/
//將從系統(tǒng)標(biāo)準(zhǔn)輸入讀入的字符串輸出到Server
os.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(biāo)準(zhǔn)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(biāo)準(zhǔn)輸出上
readline = sin.readLine(); //從系統(tǒng)標(biāo)準(zhǔn)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(cuò)，則打印出錯(cuò)信息
}
}
}
運(yùn)行截圖
三、實(shí)驗(yàn)遇到的問(wèn)題
問(wèn)題1：學(xué)習(xí)了教材以后仍然 不知道如何把信息傳給服務(wù)器
問(wèn)題2：DH算法如何運(yùn)用？
問(wèn)題2解決方案：通過(guò)學(xué)習(xí)老師的博客Java 密碼學(xué)算法中關(guān)于DH算法的知識(shí)點(diǎn)
四、PSP時(shí)間
步驟
耗時(shí)
百分比
|需求分析 | 30min | 12%
| 設(shè)計(jì) | 40min | 15%
| 代碼實(shí)現(xiàn) | 90min | 34%
|測(cè)試 | 45min | 17%
|分析總結(jié) | 60min |23%
七、參考資料
總結(jié)
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