showpic.java

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package com.qhit.sys;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ShowPic extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public ShowPic() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doPost(request,response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		String imageid = request.getParameter("imageid");
		ServletOutputStream sos = response.getOutputStream();
		String picpath = request.getRealPath("uploadpic") + "/" + imageid + ".jpg";
		java.io.File f = new java.io.File(picpath);
		if(!f.exists()){
			picpath = request.getRealPath("uploadpic") + "/null.jpg";
		}
		java.io.InputStream is = new java.io.FileInputStream(picpath);
		int b = 0;
		while((b = is.read())!= -1){
			sos.write(b);
		}
		is.close();
		sos.close();
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}