Question

i 对闯入和 j来说是非常新的,而且我必须做一项任务,即我必须做客人笔。

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>

表格

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

Answer 1

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:

rel=“nofollow” 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.

见以下链接:

友情链接