ext 请求的servlet的返回的数据 乱码

Java code 
response.setContentType("text/html"); 
[b][b][color=red]response.setCharacterEncoding("utf-8");//--------------一定要在printwriter的前面写-----------PrintWriter out= response.getWriter(); [/color][/b][/b]
ProjectMgr pm= ProjectMgr.getInstance(); 
String str= pm.getProjectTest(request); 
System.out.println(str);//这里打印的是正常的out.print(str); 
out.flush(); 
out.close();returnnull;