解决struts2在(IE,Firefox)下载文件名乱码问题。

对浏览器类型进行判断。

	// 判断浏览器
			HttpServletRequest request = ServletActionContext.getRequest();
			String Agent = request.getHeader("User-Agent");
			if (null != Agent) {
				Agent = Agent.toLowerCase();
				if (Agent.indexOf("firefox") != -1) {
					filename = new String(doc.getSubject().getBytes(),"iso8859-1");
				} else if (Agent.indexOf("msie") != -1) {
					filename = java.net.URLEncoder.encode(doc.getSubject(),"UTF-8");
				} else {
					filename = java.net.URLEncoder.encode(doc.getSubject(),"UTF-8");
				}
			}