java下载文件（java怎么下载压缩文件）

本文目录

• java怎么下载压缩文件
• java下载服务器上的文件到客户端
• java下载文件，怎么指定下载到指定的文件夹下啊，就是不弹出保存框，直接下载到指定的文件夹下，谢谢回答
• java 如何实现下载功能
• java 下载功能
• 通过java实现文件下载
• 怎样通过java实现服务器上文件下载
• 求问Java文件下载的几种方式
• Java文件下载怎么实现的

java怎么下载压缩文件

可以用java的输入，输出流，设置返回的类型为下转 response.setContentType(“application/x-download“);//设置为下载application/x-download String filedownload = “/要下载的文件名“;//即将下载的文件的相对路径 String filedisplay = “最终要显示给用户的保存文件名“;//下载文件时显示的文件保存名称 String filenamedisplay = URLEncoder.encode(filedisplay,“UTF-8“); response.addHeader(“Content-Disposition“,“attachment;filename=“ + filedisplay);

java下载服务器上的文件到客户端

java编程方法下载服务器上的文件到本地客服端，代码如下：

import java.io.BufferedWriter;import java.io.File;import java.io.FileOutputStream;import java.io.FileWriter;import java.io.IOException;import java.io.InputStream;import java.net.URL;import java.net.URLConnection; public class DownLoad {    public static void downloadFile(URL theURL, String filePath) throws IOException {     File dirFile = new File(filePath);      if(!dirFile.exists()){         //文件路径不存在时，自动创建目录        dirFile.mkdir();      }  //从服务器上获取图片并保存     URLConnection connection = theURL.openConnection();     InputStream in = connection.getInputStream();       FileOutputStream os = new FileOutputStream(filePath+“\\123.png“);      byte buffer = new byte[4 * 1024];       int read;       while ((read = in.read(buffer)) 》 0) {          os.write(buffer, 0, read);            }         os.close();         in.close();  }        public static void main(String args) {       //下面添加服务器的IP地址和端口，以及要下载的文件路径      String urlPath = “http://服务器IP地址:端口/image/123.png“;             //下面代码是下载到本地的位置      String filePath = “d:\\excel“;         URL url = new URL(urlPath);             try {                downloadFile(url,filePath);              } catch (IOException e) {               e.printStackTrace();            }         }   }

java下载文件，怎么指定下载到指定的文件夹下啊，就是不弹出保存框，直接下载到指定的文件夹下，谢谢回答

如果是用 IE 等浏览器下载，这些浏览器都有自己的下载目录定义。如果是你自己用 Java 写了一个浏览器，则在接收到下载流时，用 FileOutputStream fos = new FileOutputStream(“d:\\java-browser\\downloads“); 即可。

java 如何实现下载功能

import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.io.RandomAccessFile;import java.net.HttpURLConnection;import java.net.ProtocolException;import java.net.URI;import java.net.URL;import java.util.Random;/** * * 实现了下载的功能*/ public class SimpleTh { public static void main(String args){ // TODO Auto-generated method stub //String path = “

java 下载功能

import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.io.RandomAccessFile;import java.net.HttpURLConnection;import java.net.ProtocolException;import java.net.URI;import java.net.URL;import java.util.Random;/** * * 实现了下载的功能*/ public class SimpleTh { public static void main(String args){ // TODO Auto-generated method stub //String path = “

通过java实现文件下载

在jsp/servlet中断点/多线程下载文件《%@ page import=“java.io.File“ %》《%@ page import=“java.io.IOException“ %》《%@ page import=“java.io.OutputStream“ %》《%@ page import=“java.io.RandomAccessFile“ %》《%! public void downloadFile(HttpServletRequest request, HttpServletResponse response, File file) throws IOException { RandomAccessFile raf = new RandomAccessFile(file, “r“); java.io.FileInputStream fis = new java.io.FileInputStream(raf.getFD()); response.setHeader(“Server“, “www.trydone.com“); response.setHeader(“Accept-Ranges“, “bytes“); long pos = 0; long len; len = raf.length(); if (request.getHeader(“Range“) != null) { response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT); pos = Long.parseLong(request.getHeader(“Range“) .replaceAll(“bytes=“, ““) .replaceAll(“-“, ““) ); } response.setHeader(“Content-Length“, Long.toString(len - pos)); if (pos != 0) { response.setHeader(“Content-Range“, new StringBuffer() .append(“bytes “) .append(pos) .append(“-“) .append(Long.toString(len - 1)) .append(“/“) .append(len) .toString() ); } response.setContentType(“application/octet-stream“); response.setHeader(“Content-Disposition“, new StringBuffer() .append(“attachment;filename=\““) .append(file.getName()) .append(“\““).toString()); raf.seek(pos); byte b = new byte; int i; OutputStream outs = response.getOutputStream(); while ((i = raf.read(b)) != -1) { outs.write(b, 0, i); } raf.close(); fis.close(); }%》《% String filePath = request.getParameter(“file“); filePath = application.getRealPath(filePath); File file = new File(filePath); downloadFile(request, response, file);%》是否可以解决您的问题？

怎样通过java实现服务器上文件下载

在jsp/servlet中断点/多线程下载文件

《%@ page import=“java.io.File“ %》《%@ page import=“java.io.IOException“ %》《%@ page import=“java.io.OutputStream“ %》《%@ page import=“java.io.RandomAccessFile“ %》《%!    public void downloadFile(HttpServletRequest request, HttpServletResponse response, File file) throws IOException {        RandomAccessFile raf = new RandomAccessFile(file, “r“);        java.io.FileInputStream fis = new java.io.FileInputStream(raf.getFD());        response.setHeader(“Server“, “www.trydone.com“);        response.setHeader(“Accept-Ranges“, “bytes“);        long pos = 0;        long len;        len = raf.length();        if (request.getHeader(“Range“) != null) {            response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);            pos = Long.parseLong(request.getHeader(“Range“)                    .replaceAll(“bytes=“, ““)                    .replaceAll(“-“, ““)            );        }        response.setHeader(“Content-Length“, Long.toString(len - pos));        if (pos != 0) {            response.setHeader(“Content-Range“, new StringBuffer()                    .append(“bytes “)                    .append(pos)                    .append(“-“)                    .append(Long.toString(len - 1))                    .append(“/“)                    .append(len)                    .toString()            );        }        response.setContentType(“application/octet-stream“);        response.setHeader(“Content-Disposition“, new StringBuffer()                .append(“attachment;filename=\““)                .append(file.getName())                .append(“\““).toString());        raf.seek(pos);        byte b = new byte;        int i;        OutputStream outs = response.getOutputStream();        while ((i = raf.read(b)) != -1) {            outs.write(b, 0, i);        }        raf.close();        fis.close();    }%》《%    String filePath = request.getParameter(“file“);    filePath = application.getRealPath(filePath);    File file = new File(filePath);    downloadFile(request, response, file);%》

求问Java文件下载的几种方式

InputStream fis = new BufferedInputStream(new FileInputStream(path));byte buffer = new byte[fis.available()];fis.read(buffer);fis.close();// 清空responseresponse.reset();// 设置response的Headerresponse.addHeader(“Content-Disposition“, “attachment;filename=“ + new String(filename.getBytes()));response.addHeader(“Content-Length“, ““ + file.length());OutputStream toClient = new BufferedOutputStream(response.getOutputStream());response.setContentType(“application/octet-stream“);toClient.write(buffer);toClient.flush();toClient.close();} catch (IOException ex) {ex.printStackTrace();}return response;}public void downloadLocal(HttpServletResponse response) throws FileNotFoundException {// 下载本地文件String fileName = “Operator.doc“.toString(); // 文件的默认保存名// 读到流中InputStream inStream = new FileInputStream(“c:/Operator.doc“);// 文件的存放路径// 设置输出的格式response.reset();response.setContentType(“bin“);response.addHeader(“Content-Disposition“, “attachment; filename=\““ + fileName + “\““);// 循环取出流中的数据byte b = new byte;int len;try {while ((len = inStream.read(b)) 》 0)response.getOutputStream().write(b, 0, len);inStream.close();} catch (IOException e) {e.printStackTrace();}}public void downloadNet(HttpServletResponse response) throws MalformedURLException {// 下载网络文件int bytesum = 0;int byteread = 0;URL url = new URL(“windine.blogdriver.com/logo.gif“);try {URLConnection conn = url.openConnection();InputStream inStream = conn.getInputStream();FileOutputStream fs = new FileOutputStream(“c:/abc.gif“);byte buffer = new byte;int length;while ((byteread = inStream.read(buffer)) != -1) {bytesum += byteread;System.out.println(bytesum);fs.write(buffer, 0, byteread);}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}} //支持在线打开文件的一种方式public void downLoad(String filePath, HttpServletResponse response, boolean isOnLine) throws Exception {File f = new File(filePath);if (!f.exists()) {response.sendError(404, “File not found!“);return;}BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));byte buf = new byte;int len = 0;response.reset(); // 非常重要if (isOnLine) { // 在线打开方式URL u = new URL(“file:///“ + filePath);response.setContentType(u.openConnection().getContentType());response.setHeader(“Content-Disposition“, “inline; filename=“ + f.getName());// 文件名应该编码成UTF-8} else { // 纯下载方式response.setContentType(“application/x-msdownload“);response.setHeader(“Content-Disposition“, “attachment; filename=“ + f.getName());}OutputStream out = response.getOutputStream();while ((len = br.read(buf)) 》 0)out.write(buf, 0, len);br.close();out.close();}

Java文件下载怎么实现的

下载就很简单了把你要下载的文件做成超级链接，可以不用任何组件比如说下载一个word文档《a href=“名称.doc“》名称.doc《/a》路径你自己写import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.io.RandomAccessFile;import java.net.HttpURLConnection;import java.net.ProtocolException;import java.net.URI;import java.net.URL;import java.util.Random;/** * * 实现了下载的功能*/ public class SimpleTh {public static void main(String args){ // TODO Auto-generated method stub //String path = “http://www.7cd.cn/QingTengPics/倩女幽魂.mp3“;//MP3下载的地址 String path =“http://img.99luna.com/music/%CF%EB%C4%E3%BE%CD%D0%B4%D0%C5.mp3“; try { new SimpleTh().download(path, 3); //对象调用下载的方法 } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } public static String getFilename(String path){//获得文件的名字 return path.substring(path.lastIndexOf(’/’)+1); }public void download(String path,int threadsize) throws Exception//下载的方法 {//参数 下载地址，线程数量 URL url = new URL(path); HttpURLConnection conn = (HttpURLConnection)url.openConnection();//获取HttpURLConnection对象 conn.setRequestMethod(“GET“);//设置请求格式，这里是GET格式 conn.setReadTimeout(5*1000);// int filelength = conn.getContentLength();//获取要下载文件的长度 String filename = getFilename(path); File saveFile = new File(filename); RandomAccessFile accessFile = new RandomAccessFile(saveFile, “rwd“); accessFile.setLength(filelength); accessFile.close(); int block = filelength%threadsize ==0?filelength/threadsize:filelength/threadsize+1; for(int threadid = 0;threadid《=threadsize;threadid++){ new DownloadThread(url,saveFile,block,threadid).start(); } } private final class DownloadThread extends Thread{ private URL url; private File saveFile; private int block;//每条线程下载的长度 private int threadid;//线程id public DownloadThread(URL url,File saveFile,int block,int threadid){ this.url = url; this.saveFile= saveFile; this.block = block; this.threadid = threadid; } @Override public void run() { //计算开始位置的公式：线程id*每条线程下载的数据长度=？ //计算结束位置的公式：（线程id+1）*每条线程下载数据长度-1=？ int startposition = threadid*block; int endposition = (threadid+1)*block-1; try { try { RandomAccessFile accessFile = new RandomAccessFile(saveFile, “rwd“); accessFile.seek(startposition);//设置从什么位置写入数据 HttpURLConnection conn = (HttpURLConnection)url.openConnection(); conn.setRequestMethod(“GET“); conn.setReadTimeout(5*1000); conn.setRequestProperty(“Range“,“bytes= “+startposition+“-“+endposition); InputStream inStream = conn.getInputStream(); bytebuffer = new byte; int len = 0; while((len = inStream.read(buffer))!=-1){ accessFile.write(buffer, 0, len); } inStream.close(); accessFile.close(); System.out.println(“线程id：“+threadid+“下载完成“); } catch (FileNotFoundException e) { e.printStackTrace(); } } catch (IOException e) { e.printStackTrace(); } } }}

文件