获取POST正文并将其返回给浏览器

Question

我已经使用Java中的套接字实现了代理。 现在我遇到了POST方法的问题，我的意思是，我能够捕获POST请求，但我不知道如何继续捕获此POST的内容（正文，而不是标题）请求，一旦完成我想将内容返回给浏览器（我需要实现这个，因为例如我尝试使用我的用户名和密码登录时它什么都不做）。

我使用以下代码捕获请求：

while ((buffer = in.readLine()) != null){
    System.out.println(buffer);
    headers[i] = buffer;
    i++;

    if(buffer.startsWith("GET")){
        String[] splitText = buffer.split(" ");
        url = splitText[1];
        post = false;
    }
    if(buffer.startsWith("POST")){
        String[] splitText = buffer.split(" ");
        url = splitText[1];
        post = true;
    }
    if(buffer.startsWith("Host:")){
        String[] splitText = buffer.split(" ");
        host = splitText[1];
    }

    if(buffer.isEmpty()){
        break;
    }
}

我正在尝试使用此代码返回POST请求的正文（显然它不起作用，仅适用于GET请求）：

URL u = new URL(url.toString());
HttpURLConnection connection = (HttpURLConnection) u.openConnection();

if(post){
    connection.setDoOutput(true);
    connection.setRequestMethod("POST");
}

byte[] buf = new byte[8196];
int bytesRead;
InputStream stream;
stream = connection.getInputStream();

while((bytesRead = stream.read(buf)) > 0){
    out.write(buf, 0, bytesRead);
    out.flush();
}

非常感谢任何帮助。 感谢。

编辑，完整代码：

public void run() {

        try {


            BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
            BufferedOutputStream out = new BufferedOutputStream(clientSocket.getOutputStream());

            String host = null;
            String url = null;
            int i=0;
            String [] headers = new String [100];
            String buffer;
            boolean post = false;

            while ((buffer = in.readLine()) != null) {
                System.out.println(buffer);
                headers[i]=buffer;
                i++;
                if(buffer.startsWith("GET"))
                {
                    String[] splitText = buffer.split(" ");
                    url = splitText[1];
                    post = false;
                    }
                if(buffer.startsWith("POST"))
                {
                    String[] splitText = buffer.split(" ");
                    url = splitText[1];
                    post = true;
                    }
                if(buffer.startsWith("PUT"))
                {
                    String[] splitText = buffer.split(" ");
                    url = splitText[1];
                    post = true;
                    }
                if(buffer.startsWith("Host:"))
                {
                    String[] splitText = buffer.split(" ");
                    host = splitText[1];
                    }

                if (buffer.isEmpty()) break;
                }



            if (!checkURL(host) && !checkWORD(url)){

                    URL u = new URL(url.toString());
                    HttpURLConnection connection = (HttpURLConnection) u.openConnection();
                    if (post){
                        connection.setDoOutput(true);
                        connection.setRequestMethod("POST");

                    }


                    for (int x=1;x<i-1;x++){
                    if (!headers[x].contains("Accept-Encoding:")){
                        connection.setRequestProperty(headers[x].substring(0, headers[x].indexOf(":")).toString() , headers[x].replace(headers[x].substring(0, headers[x].indexOf(":") +2), "").toString());
                    }
                    }

                    boolean redirect = false;

                    int status = ((HttpURLConnection) connection).getResponseCode();
                    if (status != HttpURLConnection.HTTP_OK) {
                        if (status == HttpURLConnection.HTTP_MOVED_TEMP || status == HttpURLConnection.HTTP_MOVED_PERM || status == HttpURLConnection.HTTP_SEE_OTHER)
                        redirect = true;
                    }


                    if (redirect) {

                        String Url = connection.getHeaderField("Location");
                        URL urlloc = new URL(Url.toString());
                        connection = (HttpURLConnection) urlloc.openConnection();

                        if (checkWORD(Url)){

                            PrintWriter outt = new PrintWriter(clientSocket.getOutputStream());

                            outt.write("HTTP/1.0 200 OK\r\n");
                            outt.write("Date: Fri, 31 Dec 1999 23:59:59 GMT\r\n");
                            outt.write("Server: Apache/0.8.4\r\n");
                            outt.write("Content-Type: text/html\r\n");
                            outt.write("Content-Length: 57\r\n");
                            outt.write("Expires: Sat, 01 Jan 2000 00:59:59 GMT\r\n");
                            outt.write("Last-modified: Fri, 09 Aug 1996 14:21:40 GMT\r\n");
                            outt.write("\r\n");

                            outt.flush();
                            outt.close();

                        }

                        for (int x=1;x<i-1;x++){

                            if (!headers[x].contains("Accept-Encoding:")){
                                connection.setRequestProperty(headers[x].substring(0, headers[x].indexOf(":")).toString() , headers[x].replace(headers[x].substring(0, headers[x].indexOf(":") +2), "").toString());
                            }
                            }
                    }


                        byte[] buf = new byte[8196];
                        int bytesRead;
                        InputStream stream;
                        stream = connection.getInputStream();
                        while ((bytesRead = stream.read(buf)) > 0) {
                            out.write(buf, 0, bytesRead);
                            out.flush();
                        }


                        }else{


                            PrintWriter outt = new PrintWriter(clientSocket.getOutputStream());

                            outt.write("HTTP/1.0 200 OK\r\n");
                            outt.write("Date: Fri, 31 Dec 1999 23:59:59 GMT\r\n");
                            outt.write("Server: Apache/0.8.4\r\n");
                            outt.write("Content-Type: text/html\r\n");
                            outt.write("Content-Length: 57\r\n");
                            outt.write("Expires: Sat, 01 Jan 2000 00:59:59 GMT\r\n");
                            outt.write("Last-modified: Fri, 09 Aug 1996 14:21:40 GMT\r\n");
                            outt.write("\r\n");

                            outt.flush();
                            outt.close();
                            }

            out.close();
            in.close();
            clientSocket.close();


        } catch (Exception e) {
            e.printStackTrace();

        } 
    }