Java 在两个类之间传递数据返回null
对不起，我是Android开发的新手，现在我在我的最后一个项目中遇到了这个简单的问题，我尝试了从stackoverflow中学到的所有东西，但都没有成功。 我的项目是一个简单的客户端/服务器加密消息应用程序。 我找到了示例代码并创建了类，这些类工作正常，但不能一起工作：( 类1（EncryptActivity）使用RSA对来自其自身输入的数据进行加密。 类2（MyActivity）与服务器建立TCP连接以发送纯文本 但当我想将纯文本从MyActivity发送到EncryptActivity并获取加密文本时，我总是得到“null” 我试图传递数据的方式是使用注释“/”的代码 请帮助我：(( 加密活动：Java 在两个类之间传递数据返回null,java,android,android-intent,encryption,rsa,Java,Android,Android Intent,Encryption,Rsa,对不起，我是Android开发的新手，现在我在我的最后一个项目中遇到了这个简单的问题，我尝试了从stackoverflow中学到的所有东西，但都没有成功。 我的项目是一个简单的客户端/服务器加密消息应用程序。 我找到了示例代码并创建了类，这些类工作正常，但不能一起工作：( 类1（EncryptActivity）使用RSA对来自其自身输入的数据进行加密。 类2（MyActivity）与服务器建立TCP连接以发送纯文本 但当我想将纯文本从MyActivity发送到EncryptActivity并获取
public class EncryptActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
try {
generateKey();
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
super.onCreate(savedInstanceState);
setContentView(R.layout.encryptinput);
final Button enButton = (Button) findViewById(R.id.bEncrypt);
final Button deButton = (Button) findViewById(R.id.bDecrypt);
final EditText input = (EditText) findViewById(R.id.etPlainText);
final EditText Raw = (EditText) findViewById(R.id.etEncryptedText);
final EditText output = (EditText) findViewById(R.id.etDecryptedText);
enButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
try {
// Encrypted text
Raw.setText(encrypt(input.getText().toString()));
// Receive plain text from MyActivity
//
// Bundle gotContainer = getIntent().getExtras();
// String gotPlainText = gotContainer.getString("key");
// input.setText(gotPlainText);
// Send encrypted to MyActivty
//
// Bundle container2 = new Bundle();
// container2.putString(encrypt(input.getText().toString()),
// "key2");
// Intent myIntent2 = new Intent(EncryptActivity.this,
// MyActivity.class);
// myIntent2.putExtras(container2);
// startActivity(myIntent2);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
};
});
deButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
try {
output.setText(String.valueOf(decrypt(Raw.getText()
.toString())));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
private final static String RSA = "RSA";
public static PublicKey uk;
public static PrivateKey rk;
public static void generateKey() throws Exception {
KeyPairGenerator gen = KeyPairGenerator.getInstance(RSA);
gen.initialize(512, new SecureRandom());
KeyPair keyPair = gen.generateKeyPair();
uk = keyPair.getPublic();
rk = keyPair.getPrivate();
}
private static byte[] encrypt(String text, PublicKey pubRSA)
throws Exception {
Cipher cipher = Cipher.getInstance(RSA);
cipher.init(Cipher.ENCRYPT_MODE, pubRSA);
return cipher.doFinal(text.getBytes());
}
public final static String encrypt(String text) {
try {
return byte2hex(encrypt(text, uk));
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public final static String decrypt(String data) {
try {
return new String(decrypt(hex2byte(data.getBytes())));
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private static byte[] decrypt(byte[] src) throws Exception {
Cipher cipher = Cipher.getInstance(RSA);
cipher.init(Cipher.DECRYPT_MODE, rk);
return cipher.doFinal(src);
}
public static String byte2hex(byte[] b) {
String hs = "";
String stmp = "";
for (int n = 0; n < b.length; n++) {
stmp = Integer.toHexString(b[n] & 0xFF);
if (stmp.length() == 1)
hs += ("0" + stmp);
else
hs += stmp;
}
return hs.toUpperCase();
}
public static byte[] hex2byte(byte[] b) {
if ((b.length % 2) != 0)
throw new IllegalArgumentException("hello");
byte[] b2 = new byte[b.length / 2];
for (int n = 0; n < b.length; n += 2) {
String item = new String(b, n, 2);
b2[n / 2] = (byte) Integer.parseInt(item, 16);
}
return b2;
}
public class MyActivity extends Activity {
private ListView mList;
private ArrayList<String> arrayList;
private MyCustomAdapter mAdapter;
private TCPClient mTcpClient;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
arrayList = new ArrayList<String>();
final EditText editText = (EditText) findViewById(R.id.editText);
Button send = (Button) findViewById(R.id.send_button);
// relate the listView from java to the one created in xml
mList = (ListView) findViewById(R.id.list);
mAdapter = new MyCustomAdapter(this, arrayList);
mList.setAdapter(mAdapter);
// connect to the server
new connectTask().execute("");
send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String message = editText.getText().toString();
// String encMessage =
// EncryptActivity.encrypt(editText.getText().toString());
// Send plain text to EncryptActivity
//
// Bundle container = new Bundle();
// container.putString(message, "key");
// Intent myIntent = new Intent(MyActivity.this,
// EncryptActivity.class);
// myIntent.putExtras(container);
// startActivity(myIntent);
// Receive encrypted data from EncryptActivity
//
// Bundle gotContainer2 = getIntent().getExtras();
// String gotEncrypted = gotContainer2.getString("key2");
// add the text in the arrayList
arrayList.add("Me: " + message);
// sends the message to the server
// Change message to gotEncrypted but doesn't work :(
if (mTcpClient != null) {
mTcpClient.sendMessage(message);
}
// refresh the list
mAdapter.notifyDataSetChanged();
editText.setText("");
}
});
}
public class connectTask extends AsyncTask<String, String, TCPClient> {
@Override
protected TCPClient doInBackground(String... message) {
// we create a TCPClient object and
mTcpClient = new TCPClient(new TCPClient.OnMessageReceived() {
@Override
// here the messageReceived method is implemented
public void messageReceived(String message) {
// this method calls the onProgressUpdate
publishProgress(message);
}
});
mTcpClient.run();
return null;
}
@Override
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);
// in the arrayList we add the messaged received from server
arrayList.add(values[0]);
// notify the adapter that the data set has changed. This means that
// new message received
// from server was added to the list
mAdapter.notifyDataSetChanged();
}
}
公共类EncryptActivity扩展活动{
/**在首次创建活动时调用*/
@凌驾
创建时的公共void（Bundle savedInstanceState）{
试一试{
generateKey（）；
}捕获（异常e1）{
//TODO自动生成的捕捉块
e1.printStackTrace（）；
}
super.onCreate（savedInstanceState）；
setContentView（R.layout.encryptinput）；
最终按钮enButton=（按钮）findViewById（R.id.bEncrypt）；
最终按钮去毛刺=（按钮）findViewById（R.id.bDecrypt）；
最终EditText输入=（EditText）findViewById（R.id.etPlainText）；
最终EditText原始=（EditText）findViewById（R.id.etEncryptedText）；
最终EditText输出=（EditText）findViewById（R.id.etDecryptedText）；
setOnClickListener（新的OnClickListener（）{
公共void onClick（视图v）{
试一试{
//加密文本
saw.setText（加密（input.getText（）.toString（））；
//从MyActivity接收纯文本
//
//Bundle-gotContainer=getIntent（）.getExtras（）；
//字符串gotplantext=gotContainer.getString（“key”）；
//input.setText（gotplantext）；
//发送加密到MyActivty
//
//Bundle container2=新Bundle（）；
//container2.putString（加密（input.getText（）.toString（）），
//“键2”）；
//Intent myIntent2=新的Intent（EncryptActivity.this，
//MyActivity.class）；
//myIntent2.putExtras（容器2）；
//起始触觉（myIntent2）；
}捕获（例外e）{
//TODO自动生成的捕捉块
e、 printStackTrace（）；
}
};
});
deButton.setOnClickListener（新的OnClickListener（）{
公共void onClick（视图v）{
试一试{
output.setText（String.valueOf（decrypt）（Raw.getText（））
.toString（））；
}捕获（例外e）{
//TODO自动生成的捕捉块
e、 printStackTrace（）；
}
}
});
}
私有最终静态字符串RSA=“RSA”；
公共静态公钥；
公共静态私钥；
public static void generateKey（）引发异常{
KeyPairGenerator gen=KeyPairGenerator.getInstance（RSA）；
gen.initialize（512，新的SecureRandom（））；
KeyPair KeyPair=gen.generateKeyPair（）；
uk=keyPair.getPublic（）；
rk=keyPair.getPrivate（）；
}
私有静态字节[]加密（字符串文本，公钥pubRSA）
抛出异常{
Cipher Cipher=Cipher.getInstance（RSA）；
cipher.init（cipher.ENCRYPT_模式，publirsa）；
返回cipher.doFinal（text.getBytes（））；
}
公共最终静态字符串加密（字符串文本）{
试一试{
返回字节2hex（加密（文本，英国））；
}捕获（例外e）{
e、 printStackTrace（）；
}
返回null；
}
公共最终静态字符串解密（字符串数据）{
试一试{
返回新字符串（解密（hex2byte（data.getBytes（）））；
}捕获（例外e）{
e、 printStackTrace（）；
}
返回null；
}
私有静态字节[]解密（字节[]src）引发异常{
Cipher Cipher=Cipher.getInstance（RSA）；
cipher.init（cipher.DECRYPT_模式，rk）；
返回cipher.doFinal（src）；
}
公共静态字符串字节2hex（字节[]b）{
字符串hs=“”；
字符串stmp=“”；
对于（int n=0；npublic class EncryptActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
try {
generateKey();
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
super.onCreate(savedInstanceState);
setContentView(R.layout.encryptinput);
final Button enButton = (Button) findViewById(R.id.bEncrypt);
final Button deButton = (Button) findViewById(R.id.bDecrypt);
final EditText input = (EditText) findViewById(R.id.etPlainText);
final EditText Raw = (EditText) findViewById(R.id.etEncryptedText);
final EditText output = (EditText) findViewById(R.id.etDecryptedText);
enButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
try {
// Encrypted text
Raw.setText(encrypt(input.getText().toString()));
// Receive plain text from MyActivity
//
// Bundle gotContainer = getIntent().getExtras();
// String gotPlainText = gotContainer.getString("key");
// input.setText(gotPlainText);
// Send encrypted to MyActivty
//
// Bundle container2 = new Bundle();
// container2.putString(encrypt(input.getText().toString()),
// "key2");
// Intent myIntent2 = new Intent(EncryptActivity.this,
// MyActivity.class);
// myIntent2.putExtras(container2);
// startActivity(myIntent2);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
};
});
deButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
try {
output.setText(String.valueOf(decrypt(Raw.getText()
.toString())));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
private final static String RSA = "RSA";
public static PublicKey uk;
public static PrivateKey rk;
public static void generateKey() throws Exception {
KeyPairGenerator gen = KeyPairGenerator.getInstance(RSA);
gen.initialize(512, new SecureRandom());
KeyPair keyPair = gen.generateKeyPair();
uk = keyPair.getPublic();
rk = keyPair.getPrivate();
}
private static byte[] encrypt(String text, PublicKey pubRSA)
throws Exception {
Cipher cipher = Cipher.getInstance(RSA);
cipher.init(Cipher.ENCRYPT_MODE, pubRSA);
return cipher.doFinal(text.getBytes());
}
public final static String encrypt(String text) {
try {
return byte2hex(encrypt(text, uk));
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public final static String decrypt(String data) {
try {
return new String(decrypt(hex2byte(data.getBytes())));
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private static byte[] decrypt(byte[] src) throws Exception {
Cipher cipher = Cipher.getInstance(RSA);
cipher.init(Cipher.DECRYPT_MODE, rk);
return cipher.doFinal(src);
}
public static String byte2hex(byte[] b) {
String hs = "";
String stmp = "";
for (int n = 0; n < b.length; n++) {
stmp = Integer.toHexString(b[n] & 0xFF);
if (stmp.length() == 1)
hs += ("0" + stmp);
else
hs += stmp;
}
return hs.toUpperCase();
}
public static byte[] hex2byte(byte[] b) {
if ((b.length % 2) != 0)
throw new IllegalArgumentException("hello");
byte[] b2 = new byte[b.length / 2];
for (int n = 0; n < b.length; n += 2) {
String item = new String(b, n, 2);
b2[n / 2] = (byte) Integer.parseInt(item, 16);
}
return b2;
}
public class MyActivity extends Activity {
private ListView mList;
private ArrayList<String> arrayList;
private MyCustomAdapter mAdapter;
private TCPClient mTcpClient;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
arrayList = new ArrayList<String>();
final EditText editText = (EditText) findViewById(R.id.editText);
Button send = (Button) findViewById(R.id.send_button);
// relate the listView from java to the one created in xml
mList = (ListView) findViewById(R.id.list);
mAdapter = new MyCustomAdapter(this, arrayList);
mList.setAdapter(mAdapter);
// connect to the server
new connectTask().execute("");
send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String message = editText.getText().toString();
// String encMessage =
// EncryptActivity.encrypt(editText.getText().toString());
// Send plain text to EncryptActivity
//
// Bundle container = new Bundle();
// container.putString(message, "key");
// Intent myIntent = new Intent(MyActivity.this,
// EncryptActivity.class);
// myIntent.putExtras(container);
// startActivity(myIntent);
// Receive encrypted data from EncryptActivity
//
// Bundle gotContainer2 = getIntent().getExtras();
// String gotEncrypted = gotContainer2.getString("key2");
// add the text in the arrayList
arrayList.add("Me: " + message);
// sends the message to the server
// Change message to gotEncrypted but doesn't work :(
if (mTcpClient != null) {
mTcpClient.sendMessage(message);
}
// refresh the list
mAdapter.notifyDataSetChanged();
editText.setText("");
}
});
}
public class connectTask extends AsyncTask<String, String, TCPClient> {
@Override
protected TCPClient doInBackground(String... message) {
// we create a TCPClient object and
mTcpClient = new TCPClient(new TCPClient.OnMessageReceived() {
@Override
// here the messageReceived method is implemented
public void messageReceived(String message) {
// this method calls the onProgressUpdate
publishProgress(message);
}
});
mTcpClient.run();
return null;
}
@Override
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);
// in the arrayList we add the messaged received from server
arrayList.add(values[0]);
// notify the adapter that the data set has changed. This means that
// new message received
// from server was added to the list
mAdapter.notifyDataSetChanged();
}
}
公共类MyActivity扩展活动{
私有ListView-mList；
私有ArrayList ArrayList；
私人MyCustomAdapter mAdapter；
私有TCP客户端mTcpClient；
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_my）；
arrayList=新的arrayList（）；
final EditText EditText=（EditText）findViewById（R.id.EditText）；
按钮发送=（按钮）findViewById（R.id.send_按钮）；
//将java中的listView与xml中创建的listView关联起来
mList=（ListView）findViewById（R.id.list）；
mAdapter=新的MyCustomAdapter（此为arrayList）；
mList.setAdapter（mAdapter）；
//连接到服务器
新建connectTask（）。执行（“”）；
send.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图）{
String message=editText.getText（）.toString（）；
//字符串加密消息=
//EncryptActivity.encrypt（editText.getText（）.toString（））；
//将纯文本发送到加密活动
//
//Bundle container=新Bundle（）；
//putString（消息，“key”）；
public void onCreate(Bundle savedInstanceState) {
try {
generateKey();
} catch (Exception e1) {
e1.printStackTrace();
}
super.onCreate(savedInstanceState);
// Receive plain text from MyActivity
String plainText = getIntent().getStringExtra("plainKey");
String cipherText = encrypt(plainText);
// Send encrypted to MyActivty
Intent cryptIntent = new Intent(EncryptActivity.this, MyActivity.class);
cryptIntent.putExtra("cipherKey", cipherText);
startActivity(cryptIntent);
}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
initialize();
}
private void initialize() {
arrayList = new ArrayList<String>();
editText = (EditText) findViewById(R.id.editText);
Button send = (Button) findViewById(R.id.send_button);
mList = (ListView) findViewById(R.id.list);
mAdapter = new MyCustomAdapter(this, arrayList);
mList.setAdapter(mAdapter);
// connect to the server
new connectTask().execute("");
send.setOnClickListener(this);
}
@Override
public void onClick(View arg0) {
String plainText = editText.getText().toString();
// Send plain text to EncryptActivity
Intent plainIntent = new Intent(MyActivity.this, EncryptActivity.class);
plainIntent.putExtra("plainKey", plainText);
startActivity(plainIntent);
// Receive encrypted data from EncryptActivity
String message = getIntent().getStringExtra("cipherKey");
// add the text in the arrayList
arrayList.add("Me: " + plainText);
// sends the message to the server
if (mTcpClient != null) {
mTcpClient.sendMessage(message);
}
// refresh the list
mAdapter.notifyDataSetChanged();
editText.setText("");
}