一个完整的ajax验证的代码

package classmate; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class LoginAction extends HttpServlet { public void init(ServletConfig config) throws ServletException { } /* * 处理<GET> 请求方法. */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //设置接收信息的字符集 request.setCharacterEncoding("UTF-8"); //接收浏览器端提交的信息 String uname = request.getParameter("uname"); String psw = request.getParameter("psw"); //设置输出信息的格式及字符集 response.setContentType("text/xml; charset=UTF-8"); response.setHeader("Cache-Control", "no-cache"); //创建输出流对象 PrintWriter out = response.getWriter(); //依据验证结果输出不同的数据信息 out.println("<response>"); if(uname.equals("jenny") && psw.equals("hi")){ out.println("<res>" + "热烈的欢迎您!" + "</res>"); }else{ out.println("<res>" + "对不起,登录失败！" + "</res>"); } out.println("</response>"); out.close(); } /* * 处理<POST> 请求方法. */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }