The method used in the Response object Servlet

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Common method	description
addHeader(String name, String value)	Add the specified key value in response to the header information
containsHeader(String name)	Determining whether a header of the response is provided
encodeURL(String url)	Encoding specified URL
sendError(int sc)	Transmitting a specified error status code to the client
setHeader(String name, String value)	Value specified in the response header
setStatus(int sc)	In response to the current setting state
setContentType(String ContentType)	Set the MIME type of the response
getWriter()	Gets the output stream of characters
getOutputStream()	Obtain an output byte stream

System.out.println("I am successful");
		//add header info
//		添加头信息
		response.addHeader("aaa","bbb");
		System.out.println(response.containsHeader("aaa"));
//		response.sendError(404);
		response.setHeader("aaa","ccc");
//		response.setStatus(404);
		response.setContentType("text/html;charset=utf-8");
//		response.getWriter().write("剑徒之路");
		response.getOutputStream().write("青空一鸦".getBytes());
//		getWriter()和getOutputStream()不能同时使用