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java中下载文件代码 java下载文件夹代码
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java中怎么实现下载功能,最好能有代码
private File uploadify;
private String uploadifyFileName;
public String uploadFile1() throws Exception {
String extName = "";// 扩展名
String newFileName = "";// 新文件名
String nowTime = df.format(new Date());// 当前时间
String random = "-" + (Math.round(Math.random() * 9000) + 1000);// 随机函数
String path = "uploads/" + nowTime.substring(0, 6) + "/"
+ nowTime.substring(0, 8) + "/";// 保存路径
String savePath = ServletActionContext.getServletContext().getRealPath(
"");
savePath = savePath.replace("\\", "/");
if (!savePath.substring(savePath.length()).equals("/"))
savePath = savePath + "/";
savePath = savePath + path;
// 获取扩展名
if (uploadifyFileName.lastIndexOf(".") = 0) {
extName = uploadifyFileName.substring(uploadifyFileName
.lastIndexOf("."));
}
newFileName = uploadifyFileName.substring(0,
uploadifyFileName.lastIndexOf("."))
+ nowTime.substring(8) + random + extName;
File file = new File(savePath);
if (!file.exists())
file.mkdirs();
uploadify.renameTo(new File(savePath + newFileName));
/*
* HttpServletResponse response = ServletActionContext.getResponse();
* response.setCharacterEncoding("utf-8");
* response.getWriter().print(uploadifyFileName+"上传成功");
*/
String ctx = Struts2Utils.getRequest().getContextPath();
Struts2Utils.renderText(ctx + "/" + path + newFileName);
Wenjdetail detail = new Wenjdetail();
String pt = path + newFileName;
detail.setName(uploadifyFileName);
detail.setUrl(pt);
wenjdetailManager.saveWenjdetail(detail);
HttpServletResponse response = ServletActionContext.getResponse();
response.setCharacterEncoding("utf-8");
response.getWriter().print("," + detail.getId());
return null; // 这里不需要页面转向,所以返回空就可以了
}
java FTP下载文件在代码中如何实现知道下载完成?
public static void downloadFileFtp(KmConfig kmConfig,String fileName, String clientFileName, OutputStream outputStream){
try {
String ftpHost = kmConfig.getFtpHost();
int port = kmConfig.getFtpPort();
String userName = kmConfig.getFtpUser();
String passWord = kmConfig.getFtpPassword();
String path = kmConfig.getFtpPath();
FtpClient ftpClient = new FtpClient(ftpHost, port);// ftpHost为FTP服务器的IP地址,port为FTP服务器的登陆端口,ftpHost为String型,port为int型。
ftpClient.login(userName, passWord);// userName、passWord分别为FTP服务器的登陆用户名和密码
ftpClient.binary();
ftpClient.cd(path);// path为FTP服务器上保存上传文件的路径。
try {
TelnetInputStream in = ftpClient.get(fileName);
byte[] bytes = new byte[1024];
int cnt=0;
while ((cnt=in.read(bytes,0,bytes.length)) != -1) {
outputStream.write(bytes, 0, cnt);
}
//##############################################
//这里文件就已经下载完了,自己理解一下
//#############################################
outputStream.close();
in.close();
} catch (Exception e) {
ftpClient.closeServer();
e.printStackTrace();
}
ftpClient.closeServer();
} catch (Exception e) {
System.out.println("下载文件失败!请检查系统FTP设置,并确认FTP服务启动");
}
}
Java中文件下载该怎么写代码求高手指导
if (upfile.exists()) {
bytes = FileUtils.readFileToByteArray(upfile);
response.setContentType("application/x-download");
String agent = request.getHeader("USER-AGENT");//用户代理
// 防止中文文件名乱码
if (null != agent -1 != agent.indexOf("MSIE")) {
String codedfilename = StringUtils.replace(URLEncoder.encode(fileName, "UTF-8"), "+", "%20");
response.setHeader("Content-Disposition", "attachment;filename=" + codedfilename);
} else if (null != agent -1 != agent.indexOf("Mozilla")) {
String codedfilename = MimeUtility.encodeText(fileName, "UTF-8", "B");
response.setHeader("Content-Disposition", "attachment;filename=" + codedfilename);
} else {
response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
}
response.setContentLength(bytes.length);
response.getOutputStream().write(bytes);
}
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", ""); 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[2048]; 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java中下载文件代码的问题java中下载文件代码?
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