Struts ActionSupport 和静态方法和变量
我对 struts 和 jsp 很陌生，我必须做一个分配，其中我必须创建留言簿应用程序，
但当我尝试迭代 arrayList 时，我必须在 jsp 视图中进行分配，其中 gust 消息存储和列表是静态的，始终返回 null 我的 jspview 是
<body>
<a href="<s:url action="GuestBook"/>">Click </a>here for sign guest book<br/><br/>
<table>
<s:iterator value="messages">
<tr>
<td><s:property value="when"/><br/></td>
<td><s:property value="guest"/><br/></td>
<td><s:property value="message"/><br/></td>
</tr>
</s:iterator>
</table>
</body>
，动作类是
public class GuestBookAction extends ActionSupport {
private String guest, message;
private String when = new Date().toString();
private static ArrayList<GuestBook> messages = new ArrayList<GuestBook>();
static {
messages.add(new GuestBook("1","1","1"));
messages.add(new GuestBook("2","1","1"));
messages.add(new GuestBook("3","1","1"));
messages.add(new GuestBook("4","1","1"));
messages.add(new GuestBook("5","1","1"));
}
@Override
public String execute(){
boolean add = messages.add(new GuestBook(this.getGuest(), this.getMessage(), this.getWhen()));
if (add) {
return SUCCESS;
} else {
return ERROR;
}
}
public String getGuest() {
return guest;
}
public void setGuest(String guest) {
this.guest = guest;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public ArrayList<GuestBook> getMessages() {
return messages;
}
public void setMessages(ArrayList<GuestBook> messages) {
GuestBookAction.messages = messages;
}
public static Logger getLOG() {
return LOG;
}
public static void setLOG(Logger LOG) {
ActionSupport.LOG = LOG;
}
public String getWhen() {
return when;
}
public void setWhen(String when) {
this.when = when;
}
}
如果我不迭代它工作正常。 谢谢
i am very new to struts and jsp and i have to make a assignment in which i have to make guestbook app
but place stuck in jsp view when i amm try to iterate over arrayList in which gust message store and list is static always return null
my jspview is
<body>
<a href="<s:url action="GuestBook"/>">Click </a>here for sign guest book<br/><br/>
<table>
<s:iterator value="messages">
<tr>
<td><s:property value="when"/><br/></td>
<td><s:property value="guest"/><br/></td>
<td><s:property value="message"/><br/></td>
</tr>
</s:iterator>
</table>
</body>
and action class is
public class GuestBookAction extends ActionSupport {
private String guest, message;
private String when = new Date().toString();
private static ArrayList<GuestBook> messages = new ArrayList<GuestBook>();
static {
messages.add(new GuestBook("1","1","1"));
messages.add(new GuestBook("2","1","1"));
messages.add(new GuestBook("3","1","1"));
messages.add(new GuestBook("4","1","1"));
messages.add(new GuestBook("5","1","1"));
}
@Override
public String execute(){
boolean add = messages.add(new GuestBook(this.getGuest(), this.getMessage(), this.getWhen()));
if (add) {
return SUCCESS;
} else {
return ERROR;
}
}
public String getGuest() {
return guest;
}
public void setGuest(String guest) {
this.guest = guest;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public ArrayList<GuestBook> getMessages() {
return messages;
}
public void setMessages(ArrayList<GuestBook> messages) {
GuestBookAction.messages = messages;
}
public static Logger getLOG() {
return LOG;
}
public static void setLOG(Logger LOG) {
ActionSupport.LOG = LOG;
}
public String getWhen() {
return when;
}
public void setWhen(String when) {
this.when = when;
}
}
If I don't iterate it works fine.
thanks
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这似乎是 Struts 2 配置的问题。据说Struts 2不支持静态变量的访问。但是，您可以在属性文件中对其进行配置。请参考以下链接：
http://struts.apache.org/2.0.14 /docs/strutsproperties.html
在上面的链接中，看到最后的配置。这就是要改变的事情。
请参阅以下链接：
http://struts.apache。 org/2.x/docs/ognl-basics.html#OGNLBasics-Accessingstaticproperties
This seems to be an issue with Struts 2 configuration. It is said that Struts 2 does not support the access for static variables. But, you can configure it in the properties file. Please refer the links below:
http://struts.apache.org/2.0.14/docs/strutsproperties.html
In the above link, see the last configuration. This is the thing to be changed.
See the link below:
http://struts.apache.org/2.x/docs/ognl-basics.html#OGNLBasics-Accessingstaticproperties