功能实现：

在jsp页面中填写文本框内容，光标离开文本框，在本页面的相应地方获取数据库中改值所对应的其他数据。

servlet:

request.setCharacterEncoding("utf-8");PrintWriter out = response.getWriter();// 调用servlet层去数据库查找是否有相同用户名 并返回到页面中的其他记录String client_id = request.getParameter("client_id");ClientServices clientServices = new ClientServices();try {Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}Client client = clientServices.findClientById(client_id);if (client != null) {out.print(URLEncoder.encode(client.getClient_name(), "utf-8"));} else {out.print("false");}out.flush();out.close();

jquery：

$(document).ready(function() {$("#client_id").blur(function() {$.ajax({type : 'POST',url : 'servlet/validServlet?client_id=' + $(this).val(),data : 'client_id=' + $("#client_id").val(),success : function(msg) {if (msg == 'false') {alert("没有此人");} else {//utf-8解码解决中文乱码$("#clientInfo").html(decodeURI(msg));$("#clientInfo").attr("value", decodeURI(msg));}}});});});