jquery.post()

jar包：

json-lib-2.2.3-jdk15.jar

struts2-json-plugin-2.3.4.1.jar（此包版本必須和Struts2版本對應，否則會拋錯）

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js文件：

query-1.7.js和json2.js。

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頁面導入js文件路徑：

<script language="javascript" src="scripts/javascript/jquery-1.7.js"></script>
<script language="javascript" src="scripts/javascript/json2.js"></script>

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js函數：

function checkUserName(){
var url='checkUserName';
var params={
    studentName:'1'
};
$.post(
    url,
    params,
    function callback(json){
        var responseData = eval(json);
        var result = responseData.ckUserName;
        if(result=="pass"){
            $("h2").text("pass");
        }else{
            $("h2").text("npass");
        }
    },
    'json'
    );  
}

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配置Struts2.xml：

        <action name="checkUserName" class="com.shenzhen.management.action.HelloWorldAjaxAction" method = "checkUserName">
<result type="json">
<param name="#root">ckUserName</param>
</result>
</action>

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Action方法（通過Spring注入Service接口拋異常，所以另外寫了一個HelloWorldAjaxAction.java文件）：

public String checkUserName()
{
    String retStr = "fail";

   //通過Spring注入Service接口拋異常，未找到原因，現通過ApplicationContext獲取bean，知道如何解決的大神請留言，謝謝！
    ServletContext servletContext = ServletActionContext.getServletContext();
    ApplicationContext applicationContext = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
    StudentService studentService = (StudentService)applicationContext.getBean("studentService");
    try{
        ckUserName = "pass";
        retStr = "success";
    }catch(Exception e){
            ckUserName = "npass";
    }
    return retStr;
}