如何在 Struts 2 和 JSP 的 Action 类中仅取值答案

【问题标题】：How to take values of only selected checkbox in Action class in Struts 2 and JSP如何在 Struts 2 和 JSP 的 Action 类中仅取值
【发布时间】：2016-08-29 21:35:35
【问题描述】：

我正在显示 24 个复选框。我想获取动作类中选中复选框的所有值并将其作为新记录插入数据库中。一旦我成功获取按钮单击时选中复选框的值，插入将完成。

我参考了 this 链接，在该链接中我遵循了 steven sir 的回答，但借助该链接我只能显示布尔值，但在这里我希望选中复选框的文本值。

下面是我的 JSP 页面。

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
</head>
<body>
<s:form action="eventInsertAction">
        <!-- Main content -->
        <section class="content">
          <!-- Small boxes (Stat box) -->
          
          
          <div class="row">
            <div class="contetpanel">
                <div>
                    <div class="crevtbl"> 
                        <div class="crevtblRow"> 
                            <div class="crevtblCell">Event Name</div> 
                            <div class="crevtblCell1">:</div> 
                            <div class="crevtblCell2"><input name="event.eventName" class="formtextfield" type="text"><s:fielderror fieldName="event.eventName"/></div> 
                        </div>
                        <div class="crevtblRow"> 
                            <div class="crevtblCell">Company Name</div> 
                            <div class="crevtblCell1">:</div> 
                            <div class="crevtblCell2"><input name="event.companyName" class="formtextfield" type="text" ><s:fielderror fieldName="event.companyName"/></div> 
                        </div>
                        <div class="crevtblRow"> 
                            <div class="crevtblCell">Contact Person Name</div> 
                            <div class="crevtblCell1">:</div> 
                            <div class="crevtblCell2"><input name="event.contactPerson" class="formtextfield" type="text" ><s:fielderror fieldName="event.contactPerson"/></div> 
                        </div>
                        <div class="crevtblRow"> 
                            <div class="crevtblCell">Contact</div> 
                            <div class="crevtblCell1">:</div> 
                            <div class="crevtblCell2"><input name="event.contactNumber" class="formtextfield" type="text" ><s:fielderror fieldName="event.contactNumber"/></div> 
                        </div>
                        <div class="crevtblRow"> 
                            <div class="crevtblCell">Email</div> 
                            <div class="crevtblCell1">:</div> 
                            <div class="crevtblCell2"><input name="event.emailId" class="formtextfield" type="text" ><s:fielderror fieldName="event.emailId"/></div> 
                        </div>
                        <div class="crevtblRow"> 
                            <div class="crevtblCell">Event Venue</div> 
                            <div class="crevtblCell1">:</div> 
                            <div class="crevtblCell2"><input name="event.eventVenue" class="formtextfield" type="text" ><s:fielderror fieldName="event.eventVenue"/></div> 
                        </div>
                        <div class="crevtblRow"> 
                            <div class="crevtblCell">Event Date</div> 
                            <div class="crevtblCell1">:</div> 
                            <div class="crevtblCell2">From : <input name="event.fromDate" class="formtextfield1" type="text" placeholder="YYYY/MM/DD"> &nbsp; &nbsp; &nbsp; &nbsp; To : <input name="event.toDate" class="formtextfield1" type="text" placeholder="YYYY/MM/DD"></div> 
                        </div>
                        <div class="crevtblRow"> 
                            <div class="crevtblCell">Event Time</div> 
                            <div class="crevtblCell1">:</div> 
                            <div class="crevtblCell2"><input name="event.eventTime" class="formtextfield1" type="text" placeholder="HH:MM  AM/PM" ><s:fielderror fieldName="event.eventTime"/></div> 
                        </div>
                        <div class="crevtblRow">
                            <div class="crevtblCell">License Required</div> 
                            <div class="crevtblCell1">:</div> 
                            <div class="crevtblCell2">
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Rangabhoomi</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Fire NOC</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Fire Engine</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Premises &amp; NOC</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Performance</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">PWD</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Local Police</span><br />
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Collector</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">PPL</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">IPRS</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Traffic</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Liquor License</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Ticket Selling License</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">BMC Parking</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Parking</span><br />
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Port Trust</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Novex</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Foreign Artist</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">DCP Office</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Fire Marshal</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Sale Tax NOC</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Other</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Extra</span>
                            <input name="event.licenserequired" type="checkbox" class="formcheckbox" value=""><span class="formcheckbox_content">Commission</span>
                                
                            </div> 
                        </div>
                        <div class="crevtblRow"> 
                            <div class="crevtblCell"></div> 
                            <div class="crevtblCell1"></div> 
                            <div class="crevtblCell2"><button type="submit" class="btn btn-primary">Create Event</button></div> 
                        </div>
                    </div>
                </div>
            </div>
          </div>
            

            </section>
            </s:form>
</body>
</html>

下面是我的 setter 和 getter 类

package com.ca.pojo;

public class Event {
    public Event() {
        // TODO Auto-generated constructor stub
    }

    private String eventName;
    private String companyName;
    private String contactPerson;
    private String contactNumber;
    private String emailId;
    private String eventVenue;
    private String fromDate;
    private String toDate;
    private String eventTime;
    private String licenserequired;
    
    public String getEventName() {
        return eventName;
    }

    public void setEventName(String eventName) {
        this.eventName = eventName;
    }

    public String getCompanyName() {
        return companyName;
    }

    public void setCompanyName(String companyName) {
        this.companyName = companyName;
    }

    public String getContactPerson() {
        return contactPerson;
    }

    public void setContactPerson(String contactPerson) {
        this.contactPerson = contactPerson;
    }

    public String getContactNumber() {
        return contactNumber;
    }

    public void setContactNumber(String contactNumber) {
        this.contactNumber = contactNumber;
    }

    public String getEmailId() {
        return emailId;
    }

    public void setEmailId(String emailId) {
        this.emailId = emailId;
    }

    public String getEventVenue() {
        return eventVenue;
    }

    public void setEventVenue(String eventVenue) {
        this.eventVenue = eventVenue;
    }

    public String getFromDate() {
        return fromDate;
    }

    public void setFromDate(String fromDate) {
        this.fromDate = fromDate;
    }

    public String getToDate() {
        return toDate;
    }

    public void setToDate(String toDate) {
        this.toDate = toDate;
    }

    public String getEventTime() {
        return eventTime;
    }

    public void setEventTime(String eventTime) {
        this.eventTime = eventTime;
    }

    public String getLicenserequired() {
        return licenserequired;
    }

    public void setLicenserequired(String licenserequired) {
        this.licenserequired = licenserequired;
    }
    
}

下面是我的 Action 类

package com.ca.actions;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.ca.database.Database;
import com.ca.pojo.Event;
import com.opensymphony.xwork2.ActionSupport;

public class EventInsertAction extends ActionSupport {

    private String eventId;
    Event event;
    String name;

    public EventInsertAction() {
        // TODO Auto-generated constructor stub
    }

    
    public String getName() {
        return name;
    }


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


    public String getEventId() {
        return eventId;
    }

    public void setEventId(String eventId) {
        this.eventId = eventId;
    }

    public Event getEvent() {
        return event;
    }

    public void setEvent(Event event) {
        this.event = event;
    }

    @Override
    public String execute() throws Exception {
        
        System.out.println("Event"+event.getLicenserequired());

        // TODO Auto-generated method stub
        System.out.println("Hi Mahi"+name);

        List<Integer> ints = new ArrayList<Integer>();
        int i = 0;

        for (int i1 = 0; i1 < 10000; i1++) {
            ints.add(i1);
        }
        // Collections.shuffle(ints);

        String Id = String.valueOf(ints.get(i++));

        eventId = event.getEventName() + Id;
    
        System.out.println(eventId);
        try {
            Database database = new Database();
            Connection con = database.Get_Connection();
            System.out.println("Driver Loaded");
            PreparedStatement st = con
                    .prepareStatement("insert into event(EVENT_ID,EVENT_NAME,COMPANY_NAME,CONTACT_PERSON,CONTACT_NO,EMAIL_ID,EVENT_VENUE,FROM_DATE,TO_DATE,EVENT_TIME)"
                            + "values(?,?,?,?,?,?,?,?,?,?)");
            st.setString(1, eventId);
            st.setString(2, event.getEventName());
            st.setString(3, event.getCompanyName());
            st.setString(4, event.getContactPerson());
            st.setString(5, event.getContactNumber());
            st.setString(6, event.getEmailId());
            st.setString(7, event.getEventVenue());
            st.setString(8, event.getFromDate());
            st.setString(9, event.getToDate());
            st.setString(10, event.getEventTime());
            st.executeUpdate();
            System.out.println("success");
            con.close();
        } catch (Exception e) {
            System.out.println(e);
        }

        return "success";
    }

    @Override
    public void validate() {
        // TODO Auto-generated method stub
        super.validate();
        if (event.getEventName().isEmpty()) {
            System.out.println("Event Name");
            addFieldError("event.eventName", "Please Enter Event Name ..");
        }
        
        if (event.getCompanyName().isEmpty()) {
            addFieldError("event.companyName", "Please Enter Company Name.. ");
        }
        
        if (event.getContactNumber().isEmpty()) {
            addFieldError("event.contactNumber",
                    "Please Enter Contact Number..");
        } else {
            String expression = "^\\+?[0-9\\-]+\\*?$";
            CharSequence inputStr = event.getContactNumber();
            Pattern pattern = Pattern.compile(expression,
                    Pattern.CASE_INSENSITIVE);
            Matcher matcher = pattern.matcher(inputStr);
            if (!matcher.matches())
                addFieldError("event.contactNumber", "Invalid Contact Number..");

        }
        
        if (event.getContactPerson().isEmpty()) {
            addFieldError("event.contactPerson",
                    "Please Enter Contact Person Name..");
        }
        
        if (event.getEmailId().isEmpty()) {
            addFieldError("event.emailId", "Please Enter Email ID..");
        } else {
            String expression = "^[\\w\\-]([\\.\\w])+[\\w]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";
            CharSequence inputStr = event.getEmailId();
            Pattern pattern = Pattern.compile(expression,
                    Pattern.CASE_INSENSITIVE);
            Matcher matcher = pattern.matcher(inputStr);
            if (!matcher.matches())
                addFieldError("event.emailId", "Invalid Email Address..");
        }
        
        if (event.getEventVenue().isEmpty()) {
            addFieldError("event.eventVenue", "Please Enter Event Venue..");
        }
        
        if (event.getFromDate().isEmpty()) {
            addFieldError("event.fromDate", "Please Enter Date..");
        }
        
        if (event.getToDate().isEmpty()) {
            addFieldError("event.toDate", "Please Enter To Date..");
        }
        
        if (event.getEventTime().isEmpty()) {
            addFieldError("event.eventTime", "Please Enter Event Time..");
        }

    }

}

【问题讨论】：

请帮帮忙？

标签： java jsp checkbox struts2 checked

【解决方案1】：

value 属性不应为空 value=""。如果您遵循链接的答案，您会看到使用了 s:checkbox 标记。呈现此标记时，它为选中和未选中的复选框提供了字段值。并评论 Dave Newton 在他的书中的通知“它应该具有值 true 或 false 目前唯一可行的值。这些值仅适用于 checkbox 拦截器。”

标签呈现单个复选框 .在撰写本文时，仅与布尔值（或布尔）属性。尝试预选复选框例如，字符串值仅在字符串为真的要么错误的 .

有一个例子Struts 2 checkbox example，它使用了这样的fieldValue属性。

如果您想深入了解checkbox 拦截器的工作原理，您可以阅读<s:checkbox> not auto populating in struts2 form。

另一个使用多个复选框的示例Struts 2 multiple check boxes example。与s:checkbox 不同，它不适用于任何未经检查的值，您可以使用listKey 和listValue 属性直接映射值。

【讨论】：

好的，首先非常感谢您的回复。接下来的事情是，如果我在上面的 24 个复选框中为我的“值”属性保留任何值，那么我将能够获得仅选中的复选框？如果是，请告诉我如何以及如果我按照您提供的此链接mkyong.com/struts2/struts-2-scheckbox-checkbox-example 将能够在我的操作类中获得多个复选框的值？？
我应该接受你的还是下面我已经给出解决方案的？
你觉得哪一个更好？

【解决方案2】：

我刚刚将变量的数据类型从 boolean 更改为 string[] 。它将存储所选复选框的值。下面是我的jsp。

<s:form action="resultAction" namespace="/">

        <h2>
            <input name="checkMe" type="checkbox"
                class="formcheckbox" value="Rangabhoomi"><span
                class="formcheckbox_content">Rangabhoomi</span> 
                <input
                name="checkMe" type="checkbox" class="formcheckbox"
                value="Fire Noc"><span class="formcheckbox_content">Fire NOC</span>

        </h2>

        <input type="submit" value="Submit" />

    </s:form>

下面是我的动作类

package com.checkboxInStruts2;

import com.opensymphony.xwork2.ActionSupport;

public class CheckboxAction extends ActionSupport 
{
    private String checkMe[];

    public CheckboxAction() {
        // TODO Auto-generated constructor stub
    }

    public String[] getCheckMe() {
        return checkMe;
    }

    public void setCheckMe(String[] checkMe) {
        this.checkMe = checkMe;
    }
    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        for(int i=0;i<checkMe.length;i++)
        {
            System.out.println(checkMe[i]);
        }

        return "success";
            }


}

并在jsp标签下方显示使用。它将显示所选复选框的字符串值数组。

<s:property value="checkMe"/>

【讨论】：