ExtJS 下载文件

ExtJs前台：

window.open('/fileUpload/downloadAddNum?id=' + id+"&fileName="+fileName+"&downloadName="+downloadName);

//注：

fileName:是文件的原名称，如 dog.jpg

downloadName:是文件下载显示名称，如 狗.jpg。

后台处理：

调用 downloadFile 方法：

注：filePath为物理路径。如：C:\images\dog.jpg

public static void downloadFile(String filePath,String downloadName,HttpServletResponse response){

BufferedInputStream bis = null;
BufferedOutputStream bos =null;
OutputStream os = null;
InputStream is = null;

try {
File downloadFile = new File(filePath);//物理路径
is = new FileInputStream(downloadFile);
bis = new BufferedInputStream(is);
os = response.getOutputStream();
bos = new BufferedOutputStream(os);

downloadName = java.net.URLEncoder.encode(downloadName,"UTF-8");
//fileName = new String(fileName.getBytes("UTF-8"),"GBK");//处理中文文件名问题
response.reset();
response.setCharacterEncoding("utf-8");
response.setContentType("application/octet-stream");
response.setHeader("Content-disposition","attachment;filename="+downloadName);

byte[] buffer =new byte[8192];
int len=0;

while( (len = bis.read(buffer)) > 0){
bos.write(buffer,0,len);
}
bos.flush();
is.close();
bis.close();
os.close();
bos.close();
System.gc();
} catch (Exception e) {
e.printStackTrace();
}
}