java 使用 <html:text /> 编写对象的字符串属性
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Writing a string property of an object with <html:text />
提问by Buhake Sindi
I've got an object in my form that contains various string properties.
我的表单中有一个包含各种字符串属性的对象。
When I want to print it in my JSP form I could do it with
当我想在我的 JSP 表单中打印它时，我可以用
<c:out value="${form.company.address}" />
which works perfectly.
这完美地工作。
Now I want to create an HTML input field. But when I write
现在我想创建一个 HTML 输入字段。但是当我写
<html:text property="company.address" />
<html:text property="company.address" />
I get an error saying
我收到一条错误消息
Caused by: javax.servlet.jsp.JspException: No getter method for property company.address of bean org.apache.struts.taglib.html.BEAN
Do you know how I can create an HTML input field with my company's address?
您知道如何使用公司地址创建 HTML 输入字段吗？
My bean's got the necessary corresponding getters and setters.
我的 bean 有必要的相应 getter 和 setter。
回答by Buhake Sindi
The correct way of translating this:
正确的翻译方法：
<c:out value="${UFForm.company.address}" />
to Struts is,
对 Struts 来说，
<html:text name="UFForm" property="company.address">
It means that there's a request with name UFFormwith a bean that contains a method getCompany()(which I'm assuming returns a Companyobject) and that in turns has a getAddress()getter (if you understand what I mean). In a nutshell, the bean from request/session UFForm, the TagLib is accessing getCompany().getAddress();
这意味着有一个名称UFForm为 bean的请求，其中包含一个方法getCompany()（我假设它返回一个Company对象），而该方法又具有一个getAddress()getter（如果您理解我的意思）。简而言之，来自 request/session 的 bean UFForm，TagLib 正在访问getCompany().getAddress()；
PSHope that getAddress()doesn't return a nullelse <html:text />will throw an exception.
PS希望getAddress()不返回null否则<html:text />会抛出异常。
EditTo explain what I did above:
编辑解释我在上面做了什么：
public class Company implements Serializable {
private String address;
//Setter
public void setAddress(String address) {
this.address = address;
}
//Getter
public String getAddress() { return this.address; }
}
public class UFForm implements Serializable {
private Company company;
public void setCompany(Company company) {
this.company = company;
}
public void getCompany() {
if (this.company == null) {
setCompany(new Company());
}
return this.company;
}
}
What I did above in <html:text />is equivalent to
我在上面所做的<html:text />相当于
UFForm ufForm = ....;
String property = ufForm.getCompany().getAddress();
回答by Dheeraj Joshi
Your bean should have corresponding setter and getter methods.
你的 bean 应该有相应的 setter 和 getter 方法。
Html form
html格式
<html:text property="name" size="10" maxlength="10">
Corresponding bean.
对应豆。
public class AddressForm
{
private String name=null;
public void setName(String name){
this.name=name;
}
public String getName(){
return this.name;
}
}
回答by Dheeraj Joshi
When you are getting the value for the text box with:
当您通过以下方式获取文本框的值时：
<html:text property="company.address" />
You are in fact saying to Struts to do:
你实际上是在对 Struts 说：
formObject.getCompany().getAddress();
So you must have a getter for the company (which must not return null or the next operation will fail) and a setter for the address on the company object. The setters/getters must be public. This must already be the case since you can do the following with no error:
所以你必须有一个公司的 getter（它不能返回 null 否则下一个操作将失败）和公司对象上的地址的 setter。setter/getter 必须是公开的。这一定是这种情况，因为您可以毫无错误地执行以下操作：
<c:out value="${UFForm.company.address}" />
Now, the thing that bugs me is this part: ${UFForm.. When you use JSTL you are accessing the form explicitly. With the <html:text>you access a property on the form implicitly. This implicit form is provided by the enclosing <html:form>tag. Do you have the <html:text>inside a <html:form>?
现在，让我烦恼的是这部分：${UFForm.. 当您使用 JSTL 时，您是在显式访问表单。随着<html:text>您隐式访问表单上的属性。这种隐式形式由封闭<html:form>标签提供。你有<html:text>里面<html:form>吗？
The form bean is located/created/exposed based on the form bean specification for the associated ActionMappingso check your mapping also.
表单 bean 是根据关联的表单 bean 规范定位/创建/公开的，ActionMapping因此还要检查您的映射。
