未将字符串添加到ArrayList中/未更新 [英] Added String to ArrayList not shown / not updated
问题描述
...所以我有@ApplicationScoped Bean应用程序" ..
...So i've got my @ApplicationScoped Bean "Application"..:
@ManagedBean(name = "Application")
@ApplicationScoped
public class Application implements Serializable {
private boolean isRunning = false;
private ArrayList<Feed> sentNotifications = new ArrayList<>();
private ArrayList<String> emails = new ArrayList<>(
Arrays.asList("f00@b4r.com", "test@test.com")
);
private LinkedList<String> words = new LinkedList<>(
Arrays.asList("vuln","banana","pizza","bonanza")
);
private LinkedList<String> feeds = new LinkedList<>(
Arrays.asList("http://www.kb.cert.org/vulfeed",
"https://ics-cert.us-cert.gov/advisories/advisories.xml",
"https://ics-cert.us-cert.gov/alerts/alerts.xml")
);
...并想使用以下方法将字符串添加到ArrayList<String> emails
:
...and want to add a String to ArrayList<String> emails
using the method:
public String addEmail(String email) {
emails.add(email);
return null;
}
Facelet如下:
The Facelet goes as follows:
<!-- EMAILS -->
<h3>Configured Emails</h3>
<h:form>
<h:inputText value="Email" var="email"/>
<h:commandButton value="Add Email" action="#{Application.addEmail(email)}"/>
</h:form>
<h:form>
<ui:repeat var="email" value="#{Application.emails}">
<tr>
<td>#{email}</td>
<td>
<f:facet name="header">Action</f:facet>
<h:commandLink value="Delete" action="#{Application.rmEmail(email)}"/>
</td>
</tr>
<br></br>
</ui:repeat>
</h:form>
...所以当我尝试添加"blabla@bla.com"时,结果如下:
...so when i try to add "blabla@bla.com", this is the Result:
- 显示了一个删除按钮,但没有显示字符串本身?!
- 是否正确添加了String-JSF不会重新呈现视图.?
- ..还是字符串添加不正确?
请帮助! 谢谢.
推荐答案
我终于修复了它!
感谢@Kukeltje用户,他向我提示了我做错的基本事情-和@Wietlol用户,通过道德支持和相信我"来激励我进行聊天:)
Thanks to User @Kukeltje, who hinted me at basic things that i got wrong - and User @Wietlol who motivated me in the chat through moral support and 'believes in me' :)
解决方案:
..在Application.java中:
..in Application.java:
public List<Feed> sentNotifications = new ArrayList<>();
public List<String> emails = new ArrayList<>();
public List<String> words = new LinkedList<>(Arrays.asList("vuln", "banana", "pizza", "bonanza"));
public List<String> feeds = new LinkedList<>(
Arrays.asList("http://www.kb.cert.org/vulfeed",
"https://ics-cert.us-cert.gov/advisories/advisories.xml",
"https://ics-cert.us-cert.gov/alerts/alerts.xml")
);
private String currentEmail;
private String currentFeed;
private String currentWord;
[...]
public void addEmail() {
emails.add(currentEmail);
}
.. and gui.xhmtl:
..and gui.xhmtl:
<!-- EMAILS -->
<h3>Configured Emails</h3>
<h:form>
<h:inputText value="#{Application.currentEmail}" var="email"/>
<h:commandButton value="Add Email" action="#{Application.addEmail}"/>
</h:form>
<h:form>
<ui:repeat var="email" value="#{Application.emails}">
<tr>
<td>#{email}</td>
<td>
<f:facet name="header">Action</f:facet>
<h:commandLink value="Delete" action="#{Application.rmEmail(email)}"/>
</td>
</tr>
<br></br>
</ui:repeat>
</h:form>
注意action="#{Application.addEmail}"
如何不使用参数-而是通过value="#{Application.currentEmail}"
将参数传递给方法.
Notice how action="#{Application.addEmail}"
does not make use of arguments- rather the parameter is handed to the method via value="#{Application.currentEmail}"
.
如果您是读者,也有同样的问题,请考虑以下几点:
If you, reader, have the same problem please consider these points:
- 获取/设置Bean中的每个字段
- 原始字段! 无需参数的方法即可委托"原始字段,例如我的addEmail方法
- getter/setter for each Field in the bean
- primitive fields!
- argument-less methods to 'delegate' the primitive Fields, e.g. my addEmail method
希望这个答案对有同样问题的人有用!
Hope this answer is usefull to ppl having the same issue!
问候, 皮革
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