Struts2 Ajax Jquery 驗證用戶名

時間 2019-12-16

標籤 struts2 struts ajax jquery 驗證用戶名欄目 Struts 简体版

原文原文鏈接

JS：javascript

<script type="text/javascript" src="<%=basePath%>js/jquery.js"></script>
<script type="text/javascript">
    $(document).ready(
       function(){
         $("#uname").blur(    //添加文本框失去焦點事件
            function(){
            var uname=$("#uname").val();      //獲取文本框的值
             $.ajax({                         //獲取 ajax
             type:'get',                      //請求方式
             url:'<%=basePath%>login.action', //發送給哪一個Action
             data:"uname="+uname,             //發送uname給Action
             success:function(data){          //執行成功後的函數 data參數有Action返回自動賦值
                 if(data=="success")          //若是返回值爲success
                 {
                      $("#nameMessage").html("驗證成功");   //在span標籤顯示驗證成功
                 }else{
                      $("#nameMessage").html("驗證失敗");
                 }
             }
            });
        })
    });
</script>

JSP：html

<body>
    <form action="<%=basePath%>login.action">
        <p>
            <input type="text" name="uname" id="uname">
        </p>
        <p>
            <input type="text" name="upwd" id="upwd">
        </p>
        <span id="nameMessage"></span>
    </form>
</body>

Action：java

public class LoginAction extends ActionSupport {

    private String uname;
    private String upwd;

    @Override
    public String execute() throws Exception {
        HttpServletResponse response = ServletActionContext.getResponse();
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        if ("lwq".equals(uname)) {
            out.print("error");
        } else {
            out.print("success"); //最後由ajax中data自動接收
        }
        out.close();
        return null;
    }

    public String getUname() {
        return uname;
    }

    public void setUname(String uname) {
        this.uname = uname;
    }

    public String getUpwd() {
        return upwd;
    }

    public void setUpwd(String upwd) {
        this.upwd = upwd;
    }