解析原始HTTP请求

Question

我正在研究HTTP流量数据集，它由完整的POST和GET请求组成，如下所示。我用java编写了代码，将每个请求分开，并将其保存为数组列表中的字符串元素。现在我很困惑如何在java中解析这些原始HTTP请求，有什么方法比手动解析更好吗？

GET http://localhost:8080/tienda1/imagenes/3.gif/ HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; Konqueror/3.5; Linux) KHTML/3.5.8 (like Gecko)
Pragma: no-cache
Cache-control: no-cache
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Encoding: x-gzip, x-deflate, gzip, deflate
Accept-Charset: utf-8, utf-8;q=0.5, *;q=0.5
Accept-Language: en
Host: localhost:8080
Cookie: JSESSIONID=FB018FFB06011CFABD60D8E8AD58CA21
Connection: close

Answer 1

如果您只想发送原始请求，这很容易，只需使用TCP套接字发送实际的String！

比如：

    Socket socket = new Socket(host, port);

    BufferedWriter out = new BufferedWriter(
            new OutputStreamWriter(socket.getOutputStream(), "UTF8"));

    for (String line : getContents(request)) {
        System.out.println(line);
        out.write(line + "\r\n");
    }

    out.write("\r\n");
    out.flush();

有关完整代码，请参阅JoeJag的博客文章。

使现代化

我开始了一个项目，RawHTTP为请求、响应、标头等提供HTTP解析器...结果非常好，它使得在上面编写HTTP服务器和客户端变得非常容易。如果你在寻找低水平的东西，请检查一下。

Answer 2

我正在处理HTTP流量数据集，该数据集由完整的POST和GET请求组成。

因此，您需要解析包含多个HTTP请求的文件或列表。你想提取什么数据？不管怎样，这里有一个Java的HTTP解析类，它可以读取请求行中使用的方法、版本和URI，并将所有标头读取到哈希表中。

如果你想重新发明轮子，你可以用它或者自己写一个。查看RFC以了解请求的外观，以便正确解析它：

Request       = Request-Line              ; Section 5.1
                    *(( general-header        ; Section 4.5
                     | request-header         ; Section 5.3
                     | entity-header ) CRLF)  ; Section 7.1
                    CRLF
                    [ message-body ]          ; Section 4.3

Answer 3

这是一个通用的Http请求解析器，适用于所有方法类型（GET、POST等）。）

    package util.dpi.capture;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.Hashtable;

/**
 * Class for HTTP request parsing as defined by RFC 2612:
 * 
 * Request = Request-Line ; Section 5.1 (( general-header ; Section 4.5 |
 * request-header ; Section 5.3 | entity-header ) CRLF) ; Section 7.1 CRLF [
 * message-body ] ; Section 4.3
 * 
 * @author izelaya
 *
 */
public class HttpRequestParser {

    private String _requestLine;
    private Hashtable<String, String> _requestHeaders;
    private StringBuffer _messagetBody;

    public HttpRequestParser() {
        _requestHeaders = new Hashtable<String, String>();
        _messagetBody = new StringBuffer();
    }

    /**
     * Parse and HTTP request.
     * 
     * @param request
     *            String holding http request.
     * @throws IOException
     *             If an I/O error occurs reading the input stream.
     * @throws HttpFormatException
     *             If HTTP Request is malformed
     */
    public void parseRequest(String request) throws IOException, HttpFormatException {
        BufferedReader reader = new BufferedReader(new StringReader(request));

        setRequestLine(reader.readLine()); // Request-Line ; Section 5.1

        String header = reader.readLine();
        while (header.length() > 0) {
            appendHeaderParameter(header);
            header = reader.readLine();
        }

        String bodyLine = reader.readLine();
        while (bodyLine != null) {
            appendMessageBody(bodyLine);
            bodyLine = reader.readLine();
        }

    }

    /**
     * 
     * 5.1 Request-Line The Request-Line begins with a method token, followed by
     * the Request-URI and the protocol version, and ending with CRLF. The
     * elements are separated by SP characters. No CR or LF is allowed except in
     * the final CRLF sequence.
     * 
     * @return String with Request-Line
     */
    public String getRequestLine() {
        return _requestLine;
    }

    private void setRequestLine(String requestLine) throws HttpFormatException {
        if (requestLine == null || requestLine.length() == 0) {
            throw new HttpFormatException("Invalid Request-Line: " + requestLine);
        }
        _requestLine = requestLine;
    }

    private void appendHeaderParameter(String header) throws HttpFormatException {
        int idx = header.indexOf(":");
        if (idx == -1) {
            throw new HttpFormatException("Invalid Header Parameter: " + header);
        }
        _requestHeaders.put(header.substring(0, idx), header.substring(idx + 1, header.length()));
    }

    /**
     * The message-body (if any) of an HTTP message is used to carry the
     * entity-body associated with the request or response. The message-body
     * differs from the entity-body only when a transfer-coding has been
     * applied, as indicated by the Transfer-Encoding header field (section
     * 14.41).
     * @return String with message-body
     */
    public String getMessageBody() {
        return _messagetBody.toString();
    }

    private void appendMessageBody(String bodyLine) {
        _messagetBody.append(bodyLine).append("\r\n");
    }

    /**
     * For list of available headers refer to sections: 4.5, 5.3, 7.1 of RFC 2616
     * @param headerName Name of header
     * @return String with the value of the header or null if not found.
     */
    public String getHeaderParam(String headerName){
        return _requestHeaders.get(headerName);
    }
}