servlet本地项目下载没问题，部署到服务器的下载文件名乱码

 public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {


OutputStream out = null; // 输出响应正文的输出流
InputStream in = null; // 读取本地文件的输入流


// 获取filename请求参数
String filename = request.getParameter("filename");
String filepath = request.getParameter("filepath");

if (null == filename) {
out = response.getOutputStream();
out.write("Please input filename.".getBytes());
out.close();
return;
}
filename=new String(filename.getBytes("ISO-8859-1"),"UTF-8");
UploadConfiguration cfg = UploadConfiguration.getConfiguration();
String realPath = cfg.getPhysicalPath(filepath);


// 获得读取本地文件的输入流
in = new FileInputStream(new File(realPath));
int length = in.available();
// 设置响应正文的MIME类型

response.setContentType("application/force-download");
response.setHeader("Content-length", String.valueOf(length));
response.setHeader("Content-Disposition", "attachment;filename=\"" + BumfUtils.toUtf8String(filename) + "\" ");
response.setHeader("ContentType","text/html;charset=UTF-8");

// 把本地文件中的数据发送给客户
out = response.getOutputStream();
int bytesRead = 0;
byte[] buffer = new byte[512];
while ((bytesRead = in.read(buffer)) != -1) {
out.write(buffer, 0, bytesRead);
}

这个理是util

  public static String toUtf8String(String s) { 
StringBuffer sb = new StringBuffer(); 
for (int i=0;i<s.length();i++) {
char c = s.charAt(i);
if (c >= 0 && c <= 255) {
sb.append(c); 
} else {
byte[] b;
try {
b = Character.toString(c).getBytes("utf-8");
} catch (Exception ex) {
System.out.println(ex);
b = new byte[0];
} 
for (int j = 0; j < b.length; j++) {
int k = b[j];
if (k < 0) k += 256;
sb.append("%" + Integer.toHexString(k).
toUpperCase()); 
} 
} 
} 
return sb.toString(); 
}