jsp 文件安全下载，jsp文件,import java.

jsp 文件安全下载，jsp文件,import java.

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;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 DownLoadServlet extends HttpServlet {    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        String path = "C:/file";        String fileName = request.getParameter("filename");        File file = new File(path + "/" + fileName);        //如果文件存在        if (file.exists()) {            //设置响应类型及响应头            response.setContentType("application/x-msdownload");            response.addHeader("Content-Disposition", "attachment; filename=\""                    + fileName + "\"");            //读取文件            InputStream inputStream = new FileInputStream(file);            BufferedInputStream bis = new BufferedInputStream(inputStream);            byte[] bytes = new byte[1024];            ServletOutputStream outStream = response.getOutputStream();            BufferedOutputStream bos = new BufferedOutputStream(outStream);            int readLength = 0;            while ((readLength = bis.read(bytes)) != -1) {                bos.write(bytes, 0, readLength);            }            //释放资源            inputStream.close();            bis.close();            bos.flush();            outStream.close();            bos.close();        }    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        doGet(request, response);    }}