Java对各种文件的操作详解

文件下载
<%@ page contentType="text/html; charset=gb2312"%>
<%@ page import="java.io.*" %>
<%
  String fileName = "newFile.txt".toString();
  //读到流中
  InputStream inStream=new FileInputStream("c://测试//newFile.txt");
  //设置输出的格式
  response.reset();
  response.setContentType("text/plain");
  response.addHeader("Content-Disposition","attachment; filename=\"" + fileName + "\"");
  //循环取出流中的数据
  byte[] b = new byte[100];
  int len;
  ServletOutputStream outStream = response.getOutputStream();
 
  while((len=inStream.read(b)) >0)
  outStream.write(b,0,len);
  outStream.flush();
  outStream.close();
  inStream.close();
%>
 
数据库字段中的文件下载
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.util.*,java.sql.*,java.io.*"%>
<%
    String id = request.getParameter("id");
    if(id==null)
    {   throw new Exception ("没有找到图片");
    }
    else
    {
       try
       {
com.gzrealmap.lib.jdbc.JDBCUtil  SqlBean= com.gzrealmap.lib.jdbc.JDBCUtil.getInstance();
               SqlBean.connect();
               String sql = "select * from innernews where id = '"+79+"'";
               ResultSet rs = SqlBean.queryforUpdate(sql);
               rs.next();
               //String fileNamedb = rs.getString("imageName");
               String file= rs.getString("acc");
               //String fileName = new String(fileNamedb.getBytes(),"iso-8859-1");
               String fileName = "a.jpg";
                response.setHeader("Content-Disposition",  "inline; filename=\"" + fileName + "\"");    
               String filter = fileName.substring(fileName.lastIndexOf("."));
              
               if(filter.equals(".txt"))
               {
                   response.setContentType("text/plain");
               }
               else if(filter.equals(".doc")||filter.equals(".dot"))
               {
                   response.setContentType("application/msword");
               }
               else
               {
                 response.setContentType("image/jpeg;charset=GB2312");
               }
               ServletOutputStream o = response.getOutputStream();
               //o.write(file);
               out.println(file);
               //o.flush();
               //o.close();
               SqlBean.disconnect();
       }
        catch(Exception ex)
       {
           out.println(ex.getMessage());
       }
    }  
%>
 
把网页保存成文件
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.text.*,java.util.*,java.net.*,java.io.*"%>
<%
 URL stdURL = null;
 BufferedReader stdIn = null;
 PrintWriter stdOut = null;
 try {
  stdURL = new URL("http://www.163.com");
 }
 catch (MalformedURLException e) {
   throw e;
 }
 
try {
    //将字节流转变成为字符流
    stdIn = new BufferedReader(new InputStreamReader(stdURL.openStream()));
    String theFileName = "c://测试//163.html";
    stdOut = new PrintWriter(new BufferedWriter(new FileWriter(theFileName.toString())));
 }
 catch (IOException e) {
 }
 
 /***把URL指定的页面以流的形式读出，写成指定的文件***/
 try {
    String strHtml = "";
   while((strHtml = stdIn.readLine())!=null) {
   stdOut.println(strHtml);
   }
 }
 catch (IOException e) {
   throw e;
 }
 finally {  
   try {
     if(stdIn != null)
       stdIn.close();
     if(stdOut != null)
       stdOut.close();
       }
   catch (Exception e) {
     System.out.println(e);
   }
 }
%>