package test3_2.ajax; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet("/ajaxServlet") public class AjaxServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); response.setContentType("text/html; charset=UTF-8"); response.setCharacterEncoding("UTF-8"); //1、获取ajax通报过来的参数信息 String flag = request.getParameter("flag"); System.out.println(flag); //2、需要返回的数据信息 String data = " "; if("one".equals(flag)){//风行歌曲 data = "张三"; }else if("two".equals(flag)){//经典歌曲 data = "李四"; }else if("three".equals(flag)){//摇滚歌曲 data = "老王"; } //3、将数据信息回写给ajax response.getWriter().write(data); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } }
截图：
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