java - 停止在jsp中将页面上表单的先前数据重新加载到DB
问题描述
我已经完成了以下编码 ContactUs.jsp
<form action="contact1.jsp" method="post" id="contact_form">
<div class="name">
<label for="name"></label> <input type="text" placeholder="My name is" name="name" id="name_input" required>
</div>
<div class="email">
<label for="email"></label> <input type="email"
placeholder="My e-mail is" name="email" id="email_input" required>
</div>
<div class="telephone">
<label for="name"></label>
<input type="text" placeholder="My number is" id="telephone_input" name="telephone" title="lenght of number should be 10 digits for valid number" pattern="[1-9]{1}[0-9]{9}" required/>
</div>
<div class="message">
<label for="message"></label>
<textarea name="message" placeholder="I'd like to chat about"
id="message_input" cols="30" rows="5" required></textarea>
</div>
<div class="submit">
<input type="submit" value="Send Message" id="form_button" />
</div>
</form>
contact1.jsp 的代码是
String name=request.getParameter("name");
String email=request.getParameter("email");
String telephone=request.getParameter("telephone");
String message=request.getParameter("message");
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost/cinushi_university", "CinthiyaSingh", "Cinthiya@098");
Statement st=con.createStatement();
ResultSet rs;
int i=st.executeUpdate("insert into contact values('"+ name + "','"+ email + "','"+ telephone + "','"+ message + "');");
if (i > 0) {
request.getSession().setAttribute("Message", "Sent Successfully!");
request.getRequestDispatcher("ContactUs.jsp").forward(request, response);
}
else{
request.getSession().setAttribute("Message", "Incomplete Process!");
request.getRequestDispatcher("ContactUs.jsp").forward(request, response);
}
//close connection
%>
一旦我将数据添加到表单并提交它,这工作正常,但是当我点击刷新它重新提交数据时,我希望在同一页面上发布数据,当我将响应重定向到相同的 ContactUs 时,我希望清除以前提交的数据.jsp ,如果可能,请提供帮助。
解决方案
您可以使用 java 脚本History.replaceState () 函数来解决此问题。
History.replaceState() 方法修改当前历史记录条目,将其替换为方法参数中传递的 stateObj、title 和 URL。
在jsp页面中添加这个脚本-
<script>
if ( window.history.replaceState ) {
window.history.replaceState( null, null, window.location.href );
}
</script>
或者,如果提交数据不存在,则仅在表“用户”中插入数据。您必须检查唯一列。
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