Question

我有一个带有背衬物的弹簧形状。表格就像这样 -

<sf:form cssClass="form-horizontal" commandName="campaignModel" method="post">
<sf:input path="campaign.name" class="form-control" /> 
<sf:input path="landingPageModels.landingPage.url" class="form-control" />
</sf:form>

模型类（表单支持对象） -

CampaignModel.java

public class CampaignModel { 
private Campaign campaign = new CampaignImpl();
private List<LandingPageModel> landingPageModels = new Arraylist<LandingPageModel>;
public Campaign getCampaign() {
    return campaign;
}
public void setCampaign(Campaign campaign) {
    this.campaign = campaign;
}
public List<LandingPageModel> getLandingPageModels() {
    return landingPageModels;
}
public void setLandingPageModels(List<LandingPageModel> landingPageModels) {
    this.landingPageModels = landingPageModels;
}

LandingPageModel.java 是 -

public class LandingPageModel {
private LandingPage landingPage = new LandingPageImpl();
private List<LandingPageParameterImpl> landingPageParameters = new ArrayList<LandingPageParameterImpl>();

public LandingPage getLandingPage() {
    return landingPage;
}
public void setLandingPage(LandingPage landingPage) {
    this.landingPage = landingPage;
}
public List<LandingPageParameterImpl> getLandingPageParameters() {
    return landingPageParameters;
}
public void setLandingPageParameters(List<LandingPageParameterImpl> landingPageParameters) {
    this.landingPageParameters = landingPageParameters;
} 
}

LandingPage.java 是 -

public class LandingPageImpl extends EntityImpl implements LandingPage {

private String url;

public String getUrl() {
    return url;
}

public void setUrl(String url) {
    this.url = url;
} }

所以我希望我可以在landingPageModels列表中插入许多landingPage对象（拥有自己的url属性）。这意味着我可以拥有多个具有url属性的输入标签 -

<sf:input path="landingPageModels.landingPage.url" class="form-control" />
<sf:input path="landingPageModels.landingPage.url" class="form-control" />
<sf:input path="landingPageModels.landingPage.url" class="form-control" />

但是在执行此代码时，spring给出了一个错误，即landingPageModels的landingPage属性没有getter setter方法。如何解决它以及如何采取这样的多重价值？

Answer 1

为了将列表模型属性绑定到多个输入字段，您需要以呈现的形式：

<input type="text" name="landingPageModels[0].landingPage.url" class="form-control" />
<input type="text" name="landingPageModels[1].landingPage.url" class="form-control" />
<input type="text" name="landingPageModels[2].landingPage.url" class="form-control" />

通过以下方式完成：

<c:forEach items="${campaignModel.landingPageModels}" varStatus="s">
    <sf:input path="landingPageModels[${s.index}].landingPage.url" class="form-control" />
</c:forEach>

Answer 2

您获得的错误是正确的，因为landingPageModels是一个列表。您需要使用像landingPageModels[0].landingPage.url这样的索引访问权限。如果您有动态数量的输入/网址，则可以使用<c:forEach>创建动态输入变量名称

Answer 3

Values

上述不适合您查看数据吗？要在控制器中获取它们，您可能必须在HTML中使用动态表行概念，或者通过单击“添加”按钮并回放来为每个单个LandingPage条目添加到表单bean对象。

在我的<c:forEach items="${campaignModel.landingPageModels}" var="landingPage"> <sf:input path="landingPage.url" class="form- control" /> </c:forEach>命令对象具有Person属性的情况下，为了绑定我们设计页面的令牌列表作为下面的附加屏幕截图，单击添加按钮命中控制器并添加每个令牌List<Token>并渲染回相同的视图并在列表视图中显示添加的令牌，便于为List<Token>添加多个令牌。

Answer 4

我不知道如何使用spring form lib输入，但如果你想使用简单的html输入绑定，你可以像这样绑定列表

Simple.jsp

<%@taglib uri="http://www.springframework.org/tags" prefix="spring"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
</head>
<body>

    <form:form method="post" action="save.html" modelAttribute="contactForm">
        <table>
        <tr>
            <th>First Name</th>
            <th>Last Name</th>
        </tr>
            <tr>
               <td><input name="contacts[0].firstname" /></td>
                <td><input name="contacts[0].lastname" /></td>
             </tr>
             <tr>   
                <td><input name="contacts[1].firstname" /></td>
                <td><input name="contacts[1].lastname" /></td>
             </tr>   

    </table>    
    <br/>   
    <input type="submit" value="Save" />

    </form:form>
    </body>
    </html>

@controller：

@RequestMapping(value = "/save", method = RequestMethod.POST)
    public ModelAndView save(@ModelAttribute("contactForm") ContactForm contactForm) {

        List<Contact> contacts = contactForm.getContacts();

        if(null != contacts && contacts.size() > 0) {
            ContactController.contacts = contacts;
            for (Contact contact : contacts) {
                System.out.printf("%s \t %s \n", contact.getFirstname(), contact.getLastname());
            }
        }

        return new ModelAndView("show_contact", "contactForm", contactForm);
    }

ContactForm.java

import java.util.List;

public class ContactForm {

    private List<Contact> contacts;

    public List<Contact> getContacts() {
        return contacts;
    }

    public void setContacts(List<Contact> contacts) {
        this.contacts = contacts;
    }
}

Contact.java

public class Contact {
    private String firstname;
    private String lastname;
    private String email;
    private String phone;

    public Contact() {

    }
 //getters and setters

}

如何将数据绑定到弹簧形式列表

4 个答案: