Servlet Chinese garbled setcontenttype setting is invalid

This code must be obtained response Set before object

response.setContentType("text/html;charset=utf-8");

Error model ：

		PrintWriter writer = resp.getWriter();
		// Set the request and corresponding coding 
		req.setCharacterEncoding("utf-8");
		resp.setContentType("text/html;charset=utf-8");

Should be changed to ：

// Set the request and corresponding coding 
		req.setCharacterEncoding("utf-8");
		resp.setContentType("text/html;charset=utf-8");
		PrintWriter writer = resp.getWriter();