我想将下拉列表的选定值保存到数据库中。

首先index.jsp被加载。单击的注册URL，从index.jsp可以转到。register.jsp``index.jsp

struts.xml ：

<action name="registerAction" class="action.RegisterAction" method="populateSelect">
        <result name="success" >register.jsp</result>

    </action>
    <action name="register" class="action.RegisterAction" method="execute">
        <result name="success" >login.jsp</result>

    </action>

index.jsp ：

  <s:url id="url" action="registerAction">
</s:url>
  <s:a href="%{url}">Register</s:a>

register.jsp ：

   <s:form action="registerAction" method="execute">
     <s:select label="Select Date of Month" key="Month List" name="months" headerKey="0" headerValue="--Select--" list="allMonths" listKey="id" listValue="name"/>
 <s:submit value="Register"/>
 </s:form>

动作类是：

public class RegisterAction extends ActionSupport {

    String name, pwd, email, address, months;

    int phno;


    List<Month> allMonths = new ArrayList<Month>();
    List<User> users = new ArrayList<User>();
    UserDao udao = new UserDao();


public List<Month> getAllMonths() {
    return allMonths;
}

public void setAllMonths(List<Month> allMonths) {
    this.allMonths = allMonths;
}

public String getMonths() {
    return months;
}

public void setMonths(String months) {
    this.months = months;
}

public List<User> getUsers() {
    return users;
}

public void setUsers(List<User> users) {
    this.users = users;
}


public String getAddress() {
    return address;
}

public void setAddress(String address) {
    this.address = address;
}

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getPhno() {
    return phno;
}

public void setPhno(int phno) {
    this.phno = phno;
}

public String getPwd() {
    return pwd;
}

public void setPwd(String pwd) {
    this.pwd = pwd;
}

    public RegisterAction() {
    }


    public String execute() throws Exception {
        User u = new User();
        u.setName(name);
        u.setEmail(email);
        u.setAddress(address);
        u.setPhno(phno);
        u.setPwd(pwd);
        System.out.println("Hi der "+months);

        u.setMonths(months);
        udao.addUser(u);
        return "success";
    }

    public String listAllUsers() {
        users = udao.getUsers();
        System.out.println("In Action, " + users);
        return "success";
    }


    public String populateSelect() {
        allMonths = udao.getMonths();
        System.out.println("In constructor " + allMonths);
        return "success";
    }
}

下拉列表实际上只是表单字段之一。表单中还有其他字段。可以将月份以外的所有其他值输入数据库。对于月份字段，输入的值为空。

我认为下拉菜单的价值并未得到体现。