[英]How do I get chunked footers from a response on a connection that uses ThreadSafeClientConnManager?
[英]How do I send Http trailers/footers in a chunked response from within a java servlet?
基本上我的響應標頭包含
編碼傳輸分塊=,
預告片= [我要發送的一些預告片說例如“SomeTrailer”]
一旦我完成了將數據寫入Servlet輸出流,我正在編寫預告片“SomeTrailer:[value]”,但這並沒有被httpclient正確解析。 httpclient將整個輸入流(包括預告片)視為單個塊。 我已經嘗試在將數據寫入輸出流后在響應頭中編寫預告片,但沒有成功。
請幫忙
我沒有找到任何好的消息來源。
我最終為此編寫了一個簡單的單線程網絡服務器。 原來這很容易。 服務器非常簡單。 代碼雖然有點粗糙,但主要的想法就在那里。
它的作用是將filecontents作為第一個塊發送,並將文件的校驗和作為頁腳發送。
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.IOUtils;
import org.apache.log4j.Logger;
public class ChunkedResponseServer implements Runnable {
private static final Logger LOGGER = Logger.getLogger(ChunkedResponseServer.class);
// Space ' '
static final byte SP = 32;
// Tab ' '
static final byte HT = 9;
// Carriage return
static final byte CR = 13;
// Line feed character
static final byte LF = 10;
final int port;
private volatile boolean cancelled = false;
public ChunkedResponseServer(int port) {
LOGGER.info("Chunked response server running on port " + port);
this.port = port;
}
@Override
public void run() {
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(port);
while (!cancelled) {
final Socket connectionSocket = serverSocket.accept();
handle(connectionSocket);
}
} catch (final IOException e) {
throw new RuntimeException(e);
}
}
public void cancel() {
LOGGER.info("Shutting down Chunked response Server");
cancelled = true;
}
private void handle(Socket socket) throws IOException {
BufferedReader input = null;
DataOutputStream output = null;
try {
input = new BufferedReader(new InputStreamReader(socket.getInputStream()));
output = new DataOutputStream(socket.getOutputStream());
addHeaders(output);
addCRLR(output);
final String filename = readFilename(input);
final byte[] content = readContent(filename);
addContentAsChunk(output, content);
final String checksum = DigestUtils.md5Hex(content);
addLastChunkAndChecksumFooter(output, checksum);
addCRLR(output);
} finally {
IOUtils.closeQuietly(input);
IOUtils.closeQuietly(output);
}
}
private void addLastChunkAndChecksumFooter(DataOutputStream output, String checksum) throws IOException {
output.writeBytes("0");
addCRLR(output);
output.writeBytes("checksum: " + checksum);
addCRLR(output);
}
private void addContentAsChunk(DataOutputStream output, byte[] content) throws IOException {
output.writeBytes(Integer.toHexString(content.length));
addCRLR(output);
output.write(content);
addCRLR(output);
}
private void addCRLR(DataOutputStream output) throws IOException {
output.writeByte(CR);
output.writeByte(LF);
}
private void addHeaders(DataOutputStream output) throws IOException {
output.writeBytes("HTTP/1.1 200 OK");
addCRLR(output);
output.writeBytes("Content-type: text/plain");
addCRLR(output);
output.writeBytes("Transfer-encoding: chunked");
addCRLR(output);
output.writeBytes("Trailer: checksum");
addCRLR(output);
}
private String readFilename(BufferedReader input) throws IOException {
final String initialLine = input.readLine();
final String filePath = initialLine.split(" ")[1];
final String[] components = filePath.split("/");
return components[components.length - 1];
}
private byte[] readContent(String filename) throws IOException {
final InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream(filename);
return IOUtils.toByteArray(in);
}
}
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