JAVA中文件下载和文件批量下载方法
JAVA中的文件下载:
/**
* 文件下载
* @param request
* @param response
* @param filePath 文件路径
* @param filename 下载时文件名称
*/
public static void downLoadFile(HttpServletRequest request,HttpServletResponse response,String filePath,String filename){
try {
File file=new File(filePath);
// 先去掉文件名称中的空格,然后转换编码格式为utf-8,保证不出现乱码,这个文件名称 用于浏览器的下载框中自动显示的文件名
String userAgent =request.getHeader("User-Agent");
if(userAgent.contains("MSIE")||userAgent.contains("Trident")){
filename= java.net.URLEncoder.encode(filename,"UTF-8");
}else{
filename=new String(filename.getBytes("utf-8"),"iso8859-1");
}
response.addHeader("Content-Disposition", "attachment;filename=" +filename );
//response.setContentType("application/vnd.ms-excel");
response.setContentType("multipart/form-data");
byte[] b = new byte[1024];
int len=0;
FileInputStream fs=new FileInputStream(file);
PrintWriter writer = response.getWriter();
while ((len = fs.read()) != -1) {
writer.write(len);
}
fs.close();
writer.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
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 = Constant.exportAddress +loginname+date.getTime()+".zip";
File file=new File(Constant.exportAddress);
if(!file.isDirectory() && !file.exists()){
//创建单层目录
// f.mkdir();
// 创建多层目录
file.mkdirs();
}
try {
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(strZipPath));
// 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 = fis.read(buffer)) > 0) {
out.write(buffer, 0, len);
}
out.closeEntry();
fis.close();
}
out.close();
PublicMethod.downLoadFile(request, response, strZipPath, filename+".zip");
File temp=new File(strZipPath);
if(temp.exists()){
temp.delete();
}
} catch (Exception e) {
System.out.println("文件下载错误");
}
}