HttpServletRequest如何获取客户端请求的参数

wudeaaa 2010-11-02 04:02:52

服务端部署在Tomcat上，由Servlet处理，客户端使用socket进行通信（不是浏览器），工程名称TestProject
Servlet端代码



public class ProcessServlet extends HttpServlet {



	private static final long serialVersionUID = 1L;

	

	public ProcessServlet() {

		super();



	}



	

	protected void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		System.out.println("receive Request message*******************:");

		request.setCharacterEncoding("UTF-8");

		BufferedReader reader = new BufferedReader(new InputStreamReader(request.getInputStream()));

		PrintWriter out = response.getWriter();	

		

		String msg = null;

		while ((msg = reader.readLine()) != null) {//无法读取到

			System.out.println("receive Request message:" + msg);

			

		}

		

		response.setContentType("text/html;charset=utf-8");

		out.println("<html>");

		out.println("<head><title>First servlet</title></head>");

		out.println("<body>");

		out.println("welcome use selevet");

		out.println("</body>");

		out.println("</html>");		

		

		out.flush();

		out.close();



	}



	protected void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		doGet(request, response);

	}



}

客户端代码



public class Client {



	private static int port = 8080;



	public static void main(String[] arg) {

		Socket socket;

		try {



			String para = "password=1232131&safeflg=0&username=abc";

			socket = new Socket("localhost", port);

			BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),

					"UTF8"));

			InputStream ins = socket.getInputStream();

			StringBuffer sb = new StringBuffer();

			sb.append("POST /TestProject/ProcessServlet  HTTP/1.1\r\n");// 注意\r\n为回车换行

			sb.append("Accept-Language: zh-cn\r\n");

			sb.append("Connection: Keep-Alive\r\n");

			sb.append("Host:localhost\r\n");

			sb.append("Content-Length:43\r\n");

			sb.append("Content-Type: application/x-www-form-urlencoded\r\n");

			sb.append("\r\n");

			sb.append(para);

			// 接收Web服务器返回HTTP响应包

			wr.write(sb.toString());

			wr.flush();

			

			BufferedReader rd = new BufferedReader(new InputStreamReader(ins));

			String line;

			while ((line = rd.readLine()) != null) {

				System.out.println(line);

			}

		} catch (UnknownHostException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		}



	}



}

在servlet端如何获得客户端发送的username,password等参数的值？

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wudeaaa 2010-11-02

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可以了，修改后的



public class Client {



	private static int port = 8080;



	public static void main(String[] arg) {

		Socket socket;

		try {



			String para = "password=1232131&safeflg=0&username=abc";

			int len = para.length();

			socket = new Socket("localhost", port);

			BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),

					"UTF8"));

			InputStream ins = socket.getInputStream();

			StringBuffer sb = new StringBuffer();

			sb.append("POST /FileShareServer/ProcessServlet HTTP/1.1\r\n");// 注意\r\n为回车换行

			sb.append("Accept-Language: zh-cn\r\n");

			sb.append("Connection: Keep-Alive\r\n");

			sb.append("Host:localhost\r\n");

			sb.append("Content-Length:"+len+"\r\n");

			sb.append("Content-Type: application/x-www-form-urlencoded\r\n");

			sb.append("\r\n");

			sb.append(para);

			// 接收Web服务器返回HTTP响应包

			wr.write(sb.toString());

			wr.flush();

			//System.out.println(sb.toString());

			BufferedReader rd = new BufferedReader(new InputStreamReader(ins));

			String line;

			while ((line = rd.readLine()) != null) {

				System.out.println(line);

			}

		} catch (UnknownHostException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		}



	}



}

wudeaaa 2010-11-02

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[Quote=引用 1 楼 paodan 的回复:]
你的sb.append("Content-Length:43\r\n");
算错了，长度应该是你要发送消息体的长度，即 String para得长度，HTTP协议中，如果你的长度计算错误，那么服务器就会一直在等待读取，导致超时。
应该是 int len = para.length();
sb.append("Content-Length:"+len+"\r\n");
[/Quote]老大，感激涕零啊！

paodan 2010-11-02

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你的sb.append("Content-Length:43\r\n");
算错了，长度应该是你要发送消息体的长度，即 String para得长度，HTTP协议中，如果你的长度计算错误，那么服务器就会一直在等待读取，导致超时。
应该是 int len = para.length();
sb.append("Content-Length:"+len+"\r\n");