下载文件Servlet

package com.baitw.struts.utils;

import javax.servlet.*;
import javax.servlet.http.*;

import java.io.*;

public class FileDownLoad extends HttpServlet {

	/**
	 * @fields serialVersionUID
	 */
	private static final long serialVersionUID = 1L;
	private static final String CONTENT_TYPE = "text/html; charset=GBK";

	public void init() throws ServletException {
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		OutputStream out = response.getOutputStream();

		request.setCharacterEncoding("GBK");
		response.setContentType("application/octet-stream;charset=iso-8859-1");
		response.setHeader(
				"Content-disposition",
				"attachment;filename=\""
						+ java.net.URLEncoder.encode(
								new String("zzbus.apk".getBytes("iso-8859-1")),
								"UTF-8") + "\"");
		FileInputStream fis = null;

		try {
			fis = new FileInputStream(
					"D:\\6.0.35\\webapps\\ROOT\\software\\zzbus.apk");

			byte[] buffer = new byte[1024];
			int byteRead = -1;
			while ((byteRead = fis.read(buffer)) != -1) {
				out.write(buffer, 0, byteRead);
			}
			out.flush();
		} catch (Exception ex) {
			response.setContentType(CONTENT_TYPE);
			response.setHeader("Content-disposition", "inline");
			out.write("文件未找到".getBytes());
			out.close();
			ex.printStackTrace();
		}
		if (fis != null) {
			fis.close();
		}
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(req, resp);
	}

	public void destroy() {
	}
}

package com.findjar.servlet;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class FileDownLoad extends HttpServlet {
	
	/**
	 * @fields serialVersionUID
	 */
	private static final long serialVersionUID = 1L;
	private static final String CONTENT_TYPE = "text/html; charset=GBK";

	public void init() throws ServletException {
	}

	public void service(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String src_name = (String) request.getParameter("src");
		String path = request.getParameter("path");
		String realPath = request.getRealPath("resources");
		if (path != null) {
			realPath = request.getRealPath(path);
		}
		StringBuffer sb = new StringBuffer(realPath);
		sb.append("/");
		sb.append(src_name);
		String dst_name = (String) request.getParameter("dst");
		OutputStream out = response.getOutputStream();

		request.setCharacterEncoding("GBK");
		response.setContentType("application/octet-stream;charset=iso-8859-1");
		response.setHeader(
				"Content-disposition",
				"attachment;filename=\""
						+ java.net.URLEncoder.encode(
								new String(dst_name.getBytes("iso-8859-1")),
								"UTF-8") + "\"");
		FileInputStream fis = null;

		try {
			fis = new FileInputStream(sb.toString());

			byte[] buffer = new byte[1024];
			int byteRead = -1;
			while ((byteRead = fis.read(buffer)) != -1) {
				out.write(buffer, 0, byteRead);
			}
			out.flush();
		} catch (Exception ex) {
			response.setContentType(CONTENT_TYPE);
			response.setHeader("Content-disposition", "inline");
			out.write("文件未找到".getBytes());
			out.close();
			ex.printStackTrace();
		}
		if (fis != null) {
			fis.close();
		}
	}

	public void destroy() {
	}
}