SSH下载的方法2
------------------------------下作下载方法二---------------------------------------------------
String msg=null;
try {
response.setCharacterEncoding("gb2312");
response.setContentType("text/html");
javax.servlet.ServletOutputStream ou = response.getOutputStream();
//文件名
String filename=new String(request.getParameter("filename").getBytes("ISO8859_1"),"utf-8").toString();
//路径
String filepath=ServletActionContext.getServletContext().getRealPath("/upload/"+filename);
//System.out.println("DownloadFile filepath:" + filepath);
//System.out.println("DownloadFile filename:" + filename);
//java.io.File file = new java.io.File(filepath + filename);
java.io.File file = new java.io.File(filepath);
if (!file.exists()) {
System.out.println(file.getAbsolutePath() + " 文件不能存在!");
msg="抱歉,文件可能过期了!";
super.addActionError(msg);
return null;
}
// 读取文件流
java.io.FileInputStream fileInputStream = new java.io.FileInputStream(file);
// 下载文件
// 设置响应头和下载保存的文件名
if (filename != null && filename.length() > 0) {
response.setContentType("application/x-msdownload");//弹出下载的框
response.setContentLength((int) file.length());//下载统计文件大小的进度
response.setHeader("Content-Disposition", "attachment; filename=" + new String(filename.getBytes("gb2312"),"iso8859-1") + "");
//response.setHeader("Content-Length", file.length());
//下载框的信息
if (fileInputStream != null) {
int filelen = fileInputStream.available();
//文件太大时内存不能一次读出,要循环
byte a[] = new byte[filelen];
fileInputStream.read(a);
ou.write(a);
}
fileInputStream.close();
ou.close();
}
} catch (Exception e) {
e.printStackTrace();
msg="抱歉,文件可能过期了!";
super.addActionError(msg);
}
//解决完成后使用一切正常,但是总抛出java.lang.IllegalStateException异常主要是流还存在
return null;
}