文件下载时文件名在ie和firefox下面表现不一致问题

转自：http://www.iteye.com/topic/50414

private String processFileName(String fileName,String agent) throws IOException{
String codedfilename = null;
if (null != agent && -1 != agent.indexOf("MSIE")){  
String prefix = fileName.lastIndexOf(".")!=-1?fileName.substring(0,fileName.lastIndexOf(".")):fileName;
String extension = fileName.lastIndexOf(".")!=-1?fileName.substring(fileName.lastIndexOf(".")):"";
String name = java.net.URLEncoder.encode(fileName, "UTF8"); 
if(name.lastIndexOf("%0A")!=-1){
name = name.substring(0,name.length()-3);
} 
int limit = 150 - extension.length();  
if (name.length() > limit) {    
name = java.net.URLEncoder.encode(prefix.substring(0, Math.min(prefix.length(), limit / 9)), "UTF-8"); 
if(name.lastIndexOf("%0A")!=-1){
name = name.substring(0,name.length()-3);
} 
    }  

codedfilename = name + extension;  
} else if (null != agent && -1 != agent.indexOf("Mozilla")) { 
codedfilename = "=?UTF-8?B?"+(new String(org.apache.commons.codec.binary.Base64.encodeBase64(fileName.getBytes("UTF-8"))))+"?=";
}else {  
codedfilename = fileName;
}  
return codedfilename;
}