如何将json数据传回前台

当Ajax访问后台 ，后台的json信息如何传回到前台

javaHTMLUtils.writeJosn(response, json); //json转到前台

javaimport 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");//设置页面不缓存            response.setHeader("Cache-Control", "no-cache");            response.setCharacterEncoding("UTF-8");            PrintWriter out= response.getWriter(); //获取流            out.print(jsonStr);            out.flush();            out.close();        } catch (IOException e) {            e.printStackTrace();        }    }}