将数据从 select 标记发送到 servlet

Question

我有一个简单的 select 标签

Job Category:
    <select name="jobCat">
        <option value="tech">Technology</option>
        <option value="admin">Administration</option>
        <option value="biology">Biology</option>
        <option value="science">Science</option>
     </select>

现在当用户 select 选择我要将数据发送到 servlet dopost 方法时？

以上代码驻留在abc.jsp中，servlet文件名为pqr.java

如何执行以上操作？

我读过类似的东西

<form action="login" method="post">
    UserId  <input type="text/html" name="userId"/><br><br>
    Password <input type="password" name="password"/><br><br>
    <input type="submit"/>
</form>

我通过

映射到登录servlet

WebServlet("/login")

所以当用户按下提交时，数据就会发送到这个 servlet。现在我想用 select 语句实现相同的功能？

这是 scheduleMeet.jsp 文件 ` <%@ 页面语言="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@page import="important.businessService.dto.Employee" %> 在此处插入标题

</head>
<body>

Job Category:
<form action="scheduleMeet" method="post">
<select name="jobCat">
    <option value="tech">Technology</option>
    <option value="admin">Administration</option>
    <option value="biology">Biology</option>
    <option value="science">Science</option>
</select>
</form>


</body>
</html>`

这是 ScheduleMeetServlet.java ` 包很重要；

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class scheduleMeetServlet
 */
@WebServlet("/scheduleMeet")
public class scheduleMeetServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doPost(HttpServletRequest request, HttpServletResponse     response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    String jobCategory = request.getParameter("jobCat");
    System.out.println("Job category is: " + jobCategory);
}
}

`

Answer 1

您可以使用 select

的名称来完成

您的 select 必须在表格内

<form action="login" method="post">
<select name="jobCat">
        <option value="tech">Technology</option>
        <option value="admin">Administration</option>
        <option value="biology">Biology</option>
        <option value="science">Science</option>
     </select>

 UserId <input type="text/html" name="userId"/><br><br> Password <input type="password" name="password"/><br><br> <input type="submit"/> </form>

在您的登录 servlet 中，在您的 servlet post 方法中，只需使用 request.getparameter 来获取该值

eg



  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException {
        String selectedvalue  =  request.getparameter("jobCat");
         // you will get that value in the string selectedvalue
        }

将数据从 select 标记发送到 servlet

send data from select tag to servlet

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javascript

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