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Je construis cette application dans android en utilisant eclipse.Caesar Cipher sur la connexion TCP Android
Je crée un programme qui prend une chaîne de chiffrement César codée et trouve le nombre de décalages puis renvoie le texte décodé. J'ai eu beaucoup de problèmes donc j'ai cassé le programme pour décoder seulement deux mots de lettre. Je reçois rarement une chaîne retournée au client et quand je reçois quelque chose retourné, il est généralement "nul". Voici mes classes:
Cette classe décode le message:
package com.mafia.ceasarCipher;
import java.util.ArrayList;
import android.util.Log;
public class ceasar{
static Boolean cDB = new Boolean(false);
int shift=0;
fileInput dict= new fileInput();
public String cDecode(String input){
char[] s = input.toCharArray();
int length=0;
for(int i=0;i < s.length;i++){
if(s[i]!= ' '){
length++;
}
}
String output;
//char[] five=new char[5];
//char[] four=new char[4];
//char[] three=new char[3];
char[] two=new char[2];
boolean word = false;
for(int i=0;i<s.length;i++){
if(length==2){
for(int j=0;j<2;j++){
two[j]=s[j];
if(isWord(input,2))
Log.d("find", "proper" + "" + "checkWord");
word=true;
}
}
if(word==true){
output=shiftWord(input,shift);
Log.d("find", "proper" + "" + "wordIsTrue");
cDB =true;
return output;
}}
output="These are not words";
cDB =true;
return output;
}
public boolean isWord(String s,int length){
ArrayList<String> d2=new ArrayList<String>();
d2=dict.readD2();
String st=s;
if(length==2){
for(int i=0; i<26;i++){
for(int j=0;j<d2.size();j++){
if(st==d2.get(j))
Log.d("find", "proper" + "" + "isWord");
return true;
}
st=shiftWord(st,2);
shift+=1;
}
}
return false;
}
public String shiftWord(String s,int length){
Log.d("find", "proper" + "" + "shiftWord");
char[] c=s.toCharArray();
for(int i=0;i<c.length;i++){
for(int j=0;j<length;j++){
if(c[i]=='a')
c[i]='z';
else if(c[i]=='b')
c[i]='a';
else if(c[i]=='c')
c[i]='b';
else if(c[i]=='d')
c[i]='c';
else if(c[i]=='e')
c[i]='d';
else if(c[i]=='f')
c[i]='e';
else if(c[i]=='g')
c[i]='f';
else if(c[i]=='h')
c[i]='g';
else if(c[i]=='i')
c[i]='h';
else if(c[i]=='j')
c[i]='i';
else if(c[i]=='k')
c[i]='j';
else if(c[i]=='l')
c[i]='k';
else if(c[i]=='m')
c[i]='l';
else if(c[i]=='n')
c[i]='m';
else if(c[i]=='o')
c[i]='n';
else if(c[i]=='p')
c[i]='o';
else if(c[i]=='q')
c[i]='p';
else if(c[i]=='r')
c[i]='q';
else if(c[i]=='s')
c[i]='r';
else if(c[i]=='t')
c[i]='s';
else if(c[i]=='u')
c[i]='t';
else if(c[i]=='v')
c[i]='u';
else if(c[i]=='w')
c[i]='v';
else if(c[i]=='x')
c[i]='w';
else if(c[i]=='y')
c[i]='x';
else if(c[i]=='z')
c[i]='y';
}
}
return c.toString();
}
}
Ceci est le serveur
package com.mafia.ceasarCipher;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import android.util.Log;
public class Server implements Runnable {
// Public boolean cDecodeStatus= new boolean();
public static final String SERVERIP = "127.0.0.1"; // 'Within' the emulator!
public static final int SERVERPORT = 4444;
public ceasar c = new ceasar();
public int byteCounter;
public void run()
{
try{
String clientSentence;
String modifiedSentence;
ServerSocket welcomeSocket = new ServerSocket(SERVERPORT);
while(true)
{
Socket connectionSocket = welcomeSocket.accept();
BufferedReader inFromClient =
new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
clientSentence = inFromClient.readLine();
Log.e("Jake" ,"RECIEVED from client" + clientSentence);
//modifiedSentence = clientSentence.toUpperCase() + '\n';
modifiedSentence = c.cDecode(clientSentence);
Log.d("face", modifiedSentence);
System.out.println("before while"+' '+ ceasar.cDB);
while(ceasar.cDB!=true){
//System.out.println("before if"+' '+ ceasar.cDB);
//if(ceasar.cDB==true)
//Log.d("send", "sending Loop");
//System.out.println(ceasar.cDB);
outToClient.writeBytes(modifiedSentence);
}
}
}
catch (Exception e) {
Log.e("UDP", "S: Error", e);
}
}
}
C'est la classe lit le dictionnaire
package com.mafia.ceasarCipher;
import java.io.*;
import android.os.Environment;
import android.util.Log;
import java.util.ArrayList;
public class fileInput
{
public ArrayList<String> readD2(){
File sdcard = Environment.getExternalStorageDirectory();
//Get the text file
File file = new File(sdcard,"d2.txt");
//Read text from file
try {
BufferedReader br = new BufferedReader(new FileReader(file));
ArrayList<String> x = new ArrayList <String>() ;
String str;
str = br.readLine();
while(str != null) {
str = br.readLine();
x.add(str) ;
}
return x;
}
catch (IOException e) {
return null;
}
}
Ce client est le
package com.mafia.ceasarCipher;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.Socket;
import android.util.Log;
public class Client implements Runnable {
static String messageInput = new String();
// static String modifiedSentence= new String();
/*public static String getOutput(){
return modifiedSentence;
}*/
public static void setCode(String x)
{
messageInput= x;
}
@Override
public void run() {
try{
Log.d("Step", "1");
Socket clientSocket = new Socket("localhost", 4444);
Log.d("Step", "2");
DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
Log.d("Step", "3");
Log.d("Step", "4");
BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
Log.d("Step", "5");
outToServer.writeBytes(messageInput + '\n');
Log.d("Step", "6");
String modifiedSentence;
modifiedSentence = inFromServer.readLine();
Log.d("Step", "7");
Log.e("Jake" ,"RECIEVED BACK FROM SERVER: " + modifiedSentence);
clientSocket.close();
}
catch (Exception e) {
Log.e("UDP", "C: Error", e);}
}
}
Cette classe gère les méthodes onCreate et onClick
package com.mafia.ceasarCipher;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class udpConnection extends Activity {
String input = "";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
final Button button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
/* Kickoff the Server, it will
* be 'listening' for one client packet */
new Thread(new Server()).start();
final EditText et = (EditText)findViewById(R.id.editText1);
input = et.getText().toString();
/*Log.d("UDP","input is"+ input);
final TextView TV = (TextView)findViewById(R.id.textView2);
String out= Client.getOutput();
TV.setText(out);*/
/* GIve the Server some time for startup */
try {
Thread.sleep(500);
} catch (InterruptedException e) { }
// Kickoff the Client
new Thread(new Client()).start();
Client.setCode(input);
}
});
}
public String getInput()
{
return input;
}
}
L'interface graphique
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<RelativeLayout android:id="@+id/mainLayout"
android:layout_height="fill_parent" android:layout_width="fill_parent">
<TextView android:layout_height="wrap_content"
android:layout_alignParentTop="true" android:id="@+id/textView1"
android:layout_width="fill_parent" android:gravity="center"
android:textSize="24px" android:text="Networking" />
<EditText android:layout_height="wrap_content" android:id="@+id/editText1"
android:layout_width="wrap_content" android:layout_below="@+id/textView1"
android:layout_alignLeft="@+id/textView1" android:layout_alignRight="@+id/textView1"
android:hint="Enter coded text here!" android:isScrollContainer="true" android:editable="true"/>
<Button android:layout_height="wrap_content"
android:layout_width="wrap_content" android:id="@+id/button1"
android:layout_below="@+id/editText1" android:layout_alignLeft="@+id/editText1"
android:layout_alignRight="@+id/editText1" android:text="Send message" />
<TextView android:layout_height="wrap_content"
android:layout_width="wrap_content" android:layout_below="@+id/button1"
android:id="@+id/textView2" android:layout_alignLeft="@+id/button1"
android:layout_alignRight="@+id/button1" android:hint="Message will show here!"
android:editable="true" android:isScrollContainer="true"/>
<Button android:layout_below="@+id/textView2" android:id="@+id/button2" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_alignLeft="@+id/textView2" android:layout_alignRight="@+id/textView2" android:text="Display Text"></Button>
</RelativeLayout>
</LinearLayout>
Je sais que ce n'est pas ce que vous demandez, mais n'utilisez jamais de 'new boolean'. Utilisez Boolean.TRUE ou Boolean.FALSE – Jumbogram