通过ajax请求验证后台数据是否存在.
首先导入struts2的核心包。
后台Action代码
import com.opensymphony.xwork2.ActionSupport;public class CodeCheckAction extends ActionSupport {/*** */private static final long serialVersionUID = 1L;private String code;private String result;public String execute() throws Exception {System.out.println("code的值为"+code);String msg = "F";if("abc".equals(code)){msg = "T";}result="{\"retCode\":\""+msg+"\"}";return SUCCESS;}public String getCode() {return code;}public void setCode(String code) {this.code = code;}public String getResult() {return result;}public void setResult(String result) {this.result = result;}}
struts.xml代码
<action name="userAction" class="action.UserAction"><result name="index">/index.jsp</result></action>
然后jsp js代码
$(function(){$("#btn").click(function(i,e){var code_input = $("#code");var code = code_input.val()+"";$.getJSON("test?code="+code,function(root,error){var retcode = $.parseJSON(root);if(retcode.retCode != "T"){//code_input.val("");document.getElementById("msg").innerHTML="<font color='red'>不可用</font>";}else{document.getElementById("msg").innerHTML="<font color='green'>可用</font>";}});});});
body代码
<form id="form"><input id="code" name="code" type="text" /><span id="msg"></span><br/><button id="btn" type="button">测试</button></form>
然后运行
输入一个错误的，前台显示
后台控制台接收数据
现在输入一个正确的code,前台显示
后台接收数据
