當Ajax訪問後臺 ，後臺的json資訊如何傳回到前臺

java

HTMLUtils.writeJosn(response, json); //json轉到前臺

java

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;

public class HTMLUtils {
    public static void writeJosn(HttpServletResponse response,String jsonStr){

        try {

            response.setContentType
 
("text/html");
            response.setHeader("Pragma", "No-cache");//設定頁面不快取
            response.setHeader("Cache-Control", "no-cache");
            response.setCharacterEncoding("UTF-8");
            PrintWriter out= response.getWriter(); //獲取流
            out.print(jsonStr);
            out.flush();
            out
 
.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}