deal.java

jsp程序开发范例宝典

package com.core;

import java.io.*;
import java.sql.ResultSet;
import com.core.ConnDB;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Deal {
    public void download(HttpServletRequest request,
                         HttpServletResponse response, String url) {
        String filePath = request.getRealPath("/");
        String fileName=url.substring(url.lastIndexOf("/")+1);
        try {
            fileName = new String(fileName.getBytes("GBK"), "ISO-8859-1");
        } catch (UnsupportedEncodingException ex) {
        }
        response.setHeader("Content-disposition",
                           "attachment; filename=" + fileName);
        try {
            File file=new File(filePath+url);
            FileInputStream input = new FileInputStream(file);

            BufferedInputStream bufferinput = new BufferedInputStream(input);
            BufferedOutputStream bufferoutput = new BufferedOutputStream(
                    response.getOutputStream());
            byte[] temp = new byte[2048];

            int bytesRead;
            while ((bytesRead = (bufferinput.read(temp, 0, temp.length))) != -1) {
                bufferoutput.write(temp, 0, bytesRead);
            }
            bufferoutput.flush();
            if (input != null) {
                input.close();
            }
            if (bufferinput != null) {
                bufferinput.close();
            }
            if (bufferoutput != null) {
                bufferoutput.close();
            }
        } catch (Exception e) {
            e.getMessage();
        }
    }
    //获取文件相对路径及文件名
    public String getFilename(String id) {
        ConnDB conn = new ConnDB();
        String sql = "select * from tb_mp3list where id=" + id;
        ResultSet rs = conn.executeQuery(sql);
        String url = "";
        try {
            if (rs.next()) {
                url = rs.getString("url");
            }
        } catch (Exception e) {
            System.out.println("查询时的错误信息：" + e.getMessage());
        }
        return url;
    }

}