结合Ajax类使用：

 

javascript代码：

 

servlet代码：

一定要设置编码，这对于使用中文的数据很重要。

request.setCharacterEncoding("UTF-8");

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

 

package com.gordon.servlet;import java.io.IOException;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;@WebServlet(name = "IsExistUserAjaxServlet", urlPatterns = { "/IsExistUserAjaxServlet" })public class IsExistUserAjaxServlet extends HttpServlet {		private static final long serialVersionUID = 1L;	public IsExistUserAjaxServlet() {		super();	}	public void init(ServletConfig config) throws ServletException {	}	protected void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		request.setCharacterEncoding("UTF-8");		response.setContentType("text/text;charset=utf-8");		String name = request.getParameter("name");		String sex = request.getParameter("sex");		int age = Integer.valueOf(request.getParameter("age"));		System.out.println(name + ", " + sex + ", " + age);		response.getWriter().println("name:" + name + "age:" + age + "sex:" + sex);	}	protected void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		doGet(request, response);	}}