filedownload.java

功能是公安和学校的管理系统,用struts+hibernate+spring等匡架组成,在eclepse就能编译

package com.comingnet.tool;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URLEncoder;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import javax.print.URIException;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.db.ProxoolAction;

public class filedownload extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public filedownload() {
		
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		
	}

	/**
	 * 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 {

		String zyid=request.getParameter("zyid");
		request.setCharacterEncoding("utf-8");
		response.setCharacterEncoding("utf-8");
		
		
		Connection conn=null;
		PreparedStatement stmt=null;
		ResultSet rs=null;
		String zyym="";
		String zybm="";
		String zylj="";
		try {
			conn=ProxoolAction.getConnection();
			stmt=conn.prepareStatement("update m_resource set xzcs=xzcs+1 where zyid="+zyid);
			stmt.executeUpdate();
			ProxoolAction.closeStatement(stmt);
			stmt=conn.prepareStatement("select zyym,zybm,zylj from m_resource where zyid="+zyid);
			rs=stmt.executeQuery();
			while(rs.next())
			{
			zyym=rs.getString(1);
			zybm=rs.getString(2);
			zylj=rs.getString(3);
			}
		} catch (Exception e) {
			System.out.println(e.toString());
		}finally{
			ProxoolAction.closeResultSet(rs);
			ProxoolAction.closeStatement(stmt);
		}
		zyym=URLEncoder.encode(zyym, "utf-8");
		ServletContext sc=this.getServletContext();
		String abspath=sc.getRealPath("");
		abspath=abspath+"\\UploadFiles\\"+zybm;
		System.out.println(abspath+"\\UploadFiles\\"+zybm);
		
		response.setContentType("application/x-msdownload");
		response.addHeader("Content-Disposition", "attachment;filename="
				+ zyym);
		OutputStream os=response.getOutputStream();
		FileInputStream fis=null;
		try {
			fis=new FileInputStream(zylj+"\\"+zybm);
			int b=0;
			while((b=fis.read())!=-1)
			{
				os.write(b);
			}
		} catch (Exception e) {
			System.out.println(e.toString());
		}finally{
			fis.close();
			os.flush();
			os.close();
		}	
	}

	/**
	 * 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 {

		
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		
	}

}