我正在编写自己的代理服务器。我有最简单的实现。第一个代码片段是设置服务器在端口8080上侦听（在该端口上，请求将通过WiFi设置重定向）：
public class MyProxyServer {
private ServerSocket proxyServer;
public void init() throws Exception {
proxyServer = new ServerSocket(8080);
new Thread(new Runnable() {
@Override
public void run() {
while (true) {
try {
Socket proxySocket = proxyServer.accept();
ProxyConnectionHandler proxyConnectionHandler = new ProxyConnectionHandler(proxySocket);
new Thread(proxyConnectionHandler).start();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}).start();
}
}
其次是通过套接字传递请求和响应数据：
public class ProxyConnectionHandler implements Runnable {
private static final int BUFFER_SIZE = 8192;
Socket mProxySocket;
Socket mOutsideSocket;
public ProxyConnectionHandler(Socket proxySocket) {
mProxySocket = proxySocket;
}
@Override
public void run() {
try {
long startTimestamp = System.currentTimeMillis();
InputStream proxyInputStream = mProxySocket.getInputStream();
byte[] bytes = new byte[BUFFER_SIZE];
int bytesRead = proxyInputStream.read(bytes, 0, BUFFER_SIZE);
String request = new String(bytes);
Log.d("ACHTUNG", "Request: " + request);
String host = extractHost(request);
int port = request.startsWith("CONNECT") ? 443 : 80;
mOutsideSocket = new Socket(host, port);
OutputStream outsideOutputStream = mOutsideSocket.getOutputStream();
outsideOutputStream.write(bytes, 0, bytesRead);
outsideOutputStream.flush();
InputStream outsideSocketInputStream = mOutsideSocket.getInputStream();
OutputStream proxyOutputStream = mProxySocket.getOutputStream();
byte[] responseArray = new byte[BUFFER_SIZE];
do
{
bytesRead = outsideSocketInputStream.read(responseArray, 0, BUFFER_SIZE);
if (bytesRead > 0)
{
proxyOutputStream.write(responseArray, 0, bytesRead);
String response = new String(bytes, 0, bytesRead);
Log.d("ACHTUNG", "Response: " + response);
}
} while (bytesRead > 0);
proxyOutputStream.flush();
mOutsideSocket.close();
mProxySocket.close();
Log.d("ACHTUNG", "Cycle: " + (System.currentTimeMillis() - startTimestamp));
} catch (Exception e) {
e.printStackTrace();
}
}
private String extractHost(String request) {
int hStart = request.indexOf("Host: ") + 6;
int hEnd = request.indexOf('\n', hStart);
return request.substring(hStart, hEnd - 1);
}
}
当我进入浏览器时，它适用于HTTP页面，但不适用于HTTPS。还有更多可以处理SSL的内容。我不想阅读SSL软件包，我只想通过它们。怎么做 ？
我找到了解决方案。
如果来自客户端的SSL请求被修改为HTTP“ CONNECT”方法。但是，该请求不得发送到外部服务器。代理服务器必须使用以下命令响应客户端：
"HTTP/1.1 200 Connection established\r\n\r\n"
下一步是允许客户端和服务器之间的双向套接字连接。它看起来应该像这样：
public class Https443RequestHandler implements RequestHandler {
private static final int BUFFER_SIZE = 8192;
private static final String CRLF = "\r\n";
Socket mProxySocket;
Socket mOutsideSocket;
public Https443RequestHandler(Socket proxySocket) {
this.mProxySocket = proxySocket;
}
@Override
public void handle(String request) throws Exception {
byte[] bytes = request.getBytes();
int bytesRead = bytes.length;
String host = extractHost(request);
int port = 443;
mOutsideSocket = new Socket();
mOutsideSocket.setKeepAlive(true);
mOutsideSocket.connect(new InetSocketAddress(host, port));
OutputStream proxyOutputStream = mProxySocket.getOutputStream();
proxyOutputStream.write(("HTTP/1.1 200 Connection established" + CRLF + CRLF).getBytes());
proxyOutputStream.flush();
DirectionalConnectionHandler client = new DirectionalConnectionHandler(mProxySocket, mOutsideSocket);
client.start();
DirectionalConnectionHandler server = new DirectionalConnectionHandler(mOutsideSocket, mProxySocket);
server.start();
client.join();
server.join();
mOutsideSocket.close();
mProxySocket.close();
}
private String extractHost(String request) {
int hStart = request.indexOf("Host: ") + 6;
int hEnd = request.indexOf('\n', hStart);
return request.substring(hStart, hEnd - 1);
}
}
。
public class DirectionalConnectionHandler extends Thread
{
private final InputStream in;
private final OutputStream out;
DirectionalConnectionHandler(final Socket sin, final Socket sout) throws IOException
{
in = sin.getInputStream();
out = sout.getOutputStream();
}
@Override
public void run()
{
final byte[] buf = new byte[4096];
int count;
try
{
while ((count = in.read(buf, 0, buf.length)) != -1)
{
String stream = new String(buf);
out.write(buf, 0, count);
}
out.flush();
}
catch (final IOException e)
{
// Just swallow as we can't recover from this
}
}
}
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