小弟之前一直搞不明白Struts2+Jquery+实现Ajax无刷新验证用户名该怎么弄，后来经过努力，终于搞定了，应注意struts配置文件的内容，好了直接上代码了
页面代码
<body> <s:form action="registAction" method="post" namespace="/user"> <table> <tr> <td>UserName</td> <td id="t1"><input type="text" name="userName" id="userName" /></td> <td><input type="button" id="test" value="Test" /><div id="tip1"></div></td> </tr> <tr> <td>PassWord</td> <td id="t2" colspan="2"><input type="password" name="userPwd1" id="userPwd1" /></td> </tr> <tr> <td>Password AG</td> <td id="t3" colspan="2"><input type="password" name="userPwd2" id="userPwd2" /></td> </tr> <tr> <td colspan="3"> <input type="submit" value="submit" /> <input type="reset" value="reset" /> </td> </tr> </table> </s:form> </body>
javaScript代码：
$(document).ready(function(){ var inputUserNameObj = $("#userName"); var inputUserPwd1Obj = $("#userPwd1"); var inputUserPwd2Obj = $("#userPwd2"); $("#userName").blur(function(){ var text = inputUserNameObj.val(); $.post("testAction.action?userName="+text,null,function(response){ if(response=="用户名已经存在"){ document.getElementById("tip1").innerHTML="<font color='red'>"+response+"</font>"; }else{ document.getElementById("tip1").innerHTML="<font color='blue'>"+response+"</font>"; } }); }); });Action代码：
public class TestAction extends ActionSupport{ HttpServletRequest hsr; String result; public HttpServletRequest getHsr() { return hsr; } public void setHsr(HttpServletRequest hsr) { this.hsr = hsr; } public String getResult() { return result; } public void setResult(String result) { this.result = result; } public String test() throws IOException{ Map<String, String> map = new HashMap<String, String>(); ActionContext ac = ActionContext.getContext(); HttpServletRequest req = (HttpServletRequest)ac.get(ServletActionContext.HTTP_REQUEST); HttpServletResponse res = (HttpServletResponse)ac.get(ServletActionContext.HTTP_RESPONSE); String userName = req.getParameter("userName"); map.put("userName", userName); res.setContentType("text/html;charset=UTF-8"); PRintWriter w = res.getWriter(); if("jack".equals(userName)){ // 将要返回的map对象进行json处理 JSONObject jo = JSONObject.fromObject(map); System.out.println("进入了....."); // 调用json对象的toString方法转换为字符串然后赋值给result this.result = jo.toString(); w.println("用户名已经存在"); }else{ w.println("用户名不存在"); } w.close(); return "success"; } }Struts配置：
<package name="ajax" extends="json-default" > <!-- 检验用户名是否存在 --> <action name="testAction" class="com.hisoft.jqt.action.TestAction" method="test"> <!-- 返回类型为json 在sjon-default中定义 --> <result type="json" name="success"> <!-- root的值对应要返回的值的属性 --> <!-- 这里的result值即是 对应action中的 result --> <param name="root">result</param> </result> </action> </package>
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