Java下载⽂件的4种⽅式总结1.以流的⽅式下载.
public HttpServletResponse download(String path, HttpServletResponse response) {
try {
// path是指欲下载的⽂件的路径。
File file = new File(path);
// 取得⽂件名。
String filename = Name();
// 取得⽂件的后缀名。
String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();
// 以流的形式下载⽂件。
InputStream fis = new BufferedInputStream(new FileInputStream(path));
byte[] buffer = new byte[fis.available()];
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// 清空response
// 设置response的Header
response.addHeader("Content-Disposition", "attachment;filename=" + new Bytes()));
response.addHeader("Content-Length", "" + file.length());
OutputStream toClient = new OutputStream());
response.setContentType("application/octet-stream");
toClient.write(buffer);
html playtoClient.flush();
toClient.close();
} catch (IOException ex) {
ex.printStackTrace();
}
return response;
}
2.下载本地⽂件
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.setContentType("bin");
response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
// 循环取出流中的数据
byte[] b = new byte[100];
int len;
try {
while ((len = ad(b)) > 0)
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} catch (IOException e) {
e.printStackTrace();
}
}
3.下载⽹络⽂件
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/logo.gif");
try {
URLConnection conn = url.openConnection();
InputStream inStream = InputStream();
FileOutputStream fs = new FileOutputStream("c:/abc.gif");
byte[] buffer = new byte[1204];
int length;
while ((byteread = ad(buffer)) != -1) {
bytesum += byteread;
System.out.println(bytesum);
fs.write(buffer, 0, byteread);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
4.⽀持在线打开的⽅式
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[1024];
int len = 0;
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 = OutputStream();
while ((len = br.read(buf)) > 0)
out.write(buf, 0, len);
br.close();
out.close();
}
JAVA中批量下载⽂件，将下载多个⽂件打包成zip⽂件下载。
//批量⽂件下载(将多个⽂件打包成zip包下载)
public static void batchDownLoadFile(HttpServletRequest request,HttpServletResponse response,String filename,String[] filepath,String[] documentname,String loginname){  byte[] buffer = new byte[1024];
Date date=new Date();
//⽣成zip⽂件存放位置
String strZipPath = portAddress +Time()+".zip";
File file=new portAddress);
if(!file.isDirectory() && !ists()){
//创建单层⽬录
// f.mkdir();
// 创建多层⽬录
file.mkdirs();
}
try {
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(strZipPath));
java下载过程// 需要同时下载的多个⽂件
for (int i = 0; i < filepath.length; i++) {
File f=new File(filepath[i]);
FileInputStream fis = new FileInputStream(f);
System.out.println(documentname[i]);
out.putNextEntry(new ZipEntry(documentname[i]));
/
/设置压缩⽂件内的字符编码，不然会变成乱码
out.setEncoding("GBK");
int len;
// 读⼊需要下载的⽂件的内容，打包到zip⽂件
while ((len = ad(buffer)) > 0) {
out.write(buffer, 0, len);
}
out.closeEntry();
truncate例子fis.close();
}
out.close();
PublicMethod.downLoadFile(request, response, strZipPath, filename+".zip");
File temp=new File(strZipPath);
ists()){
temp.delete();
}
} catch (Exception e) {
System.out.println("⽂件下载错误");
}
}
总结
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