弹出提示对话框并重定向网页

Util.java

public class Util {
    private String dialogStr;//弹出对话框的代码
    private String message;//弹出的提示信息
    private String url;//重定向的链接地址
    public String getDialogStr() {
        dialogStr="<script language='javascript'>\r\n\t";
        dialogStr+="alert('"+message+"');\r\n\t";
        dialogStr+="window.location.href='"+url+"';\r\n";
        dialogStr+="</script>";
        return dialogStr;
    }
    public void setDialogStr(String dialogStr) {
        this.dialogStr = dialogStr;
    }
    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }
    public String getUrl() {
        return url;
    }
    public void setUrl(String url) {
        this.url = url;
    }
    
}

index.jsp

    <form action="result.jsp" method="post">
        <table>
            <tr>
                <td align="right">请输入用户名：</td>
                <td><input type="text" name="name" /></td>
            </tr>
            <tr>
                <td align="right">请输入密码：</td>
                <td><input type="password" name="pwd" /></td>
            </tr>
            <tr>
                <td colspan="2" align="center"><input type="submit" value="登录"/></td>
            </tr>
        </table>
    </form>
    

result.jsp

    <jsp:useBean id="popdialog" class="com.count.Util"></jsp:useBean>
    <jsp:setProperty property="message" name="popdialog" value="注册成功！"/>
    <jsp:setProperty property="url" name="popdialog" value="index.jsp"/>
    <jsp:getProperty property="dialogStr" name="popdialog"/>