下载csv 文件中文不乱码

String  helloString ="姓名,年龄  \n李亚希,33";
		 response.setContentType("application/x-download");  
		 String filedisplay =  "hello" + ".csv";
		 response.addHeader("Content-Disposition", "attachment;filename="  
		         + filedisplay);  
		 try {  
		     OutputStream out = response.getOutputStream();    //OutputStreamWriter write = new OutputStreamWriter(out , "utf-8");  
OutputStreamWriter write = new OutputStreamWriter(out , "gb2312");  
		   
		     write.write(helloString);  
		     write.close();