数据表排序和会话作用域不起作用

Question

这个简单数据表的排序示例是在controller的视图作用域下工作的，而不是在会话下工作。我已经提供了我的代码下面的更多信息。一个用户数据列表填充一个表。

有人知道为什么会有这样的行为吗?

...
public class User implements Serializable {
    private static final long serialVersionUID = 1L;
    private Long mId;
    private String mUsername;
    private String mPassword;
    private String mEmail;
    private Date mBirthdate;
    public User() { 
    }
    public User(Long aId, String aUsername, String aPassword, String aEmail,
            Date aBirthdate) {
        super();
        mId = aId;
        mUsername = aUsername;
        mPassword = aPassword;
        mEmail = aEmail;
        mBirthdate = aBirthdate;
    }
    ....
}

控制器

...    
@Controller("register")
@Scope("session")
public class Register implements Serializable {
    private static final long serialVersionUID = 1L;
    private User mUser;
    private List<User> mUsers = new LinkedList<User>();
    private char[] mChars = "abcdefghijklmnopqrstuvwxyz".toCharArray();
    public Register() {
    }
    @PostConstruct
    public void init() {
        mUser = new User();
        for (int i = 0; i < 10; i++) {
            mUsers.add(new User(1L, randStr(3)+"_user", randStr(1)+"pass", randStr(1)+"[e-mail]", new Date()));
        }
    }
    public User getUser() {
        return mUser;
    }
    public List<User> getUsers() {
        return mUsers;
    }
    public void submit() {
        FacesMessage msg = new FacesMessage("Registration successful");
        FacesContext.getCurrentInstance().addMessage(null, msg);
    }
    private String randStr(int len){
        StringBuilder sb = new StringBuilder();
        Random random = new Random();
        for (int i = 0; i < len; i++) {
            char c = mChars[random.nextInt(mChars.length)];
            sb.append(c);
        }
        return sb.toString();
    }
}

<<p> 视图/strong>

<p:dataTable value="#{register.users}" var="usr" paginator="true" rows="4" sortBy="#{usr.username}">
    <p:column headerText="a" sortBy="#{usr.username}">
        <h:outputText value="#{usr.username}"></h:outputText>
    </p:column>
    <p:column headerText="b" sortBy="#{usr.password}">
        <h:outputText value="#{usr.password}"></h:outputText>
    </p:column>
    <p:column headerText="c" sortBy="#{usr.email}">
        <h:outputText value="#{usr.email}"></h:outputText>
    </p:column>
</p:dataTable>

Answer 1

好的，我已经找到问题所在了。

虽然它是使用AJAX的数据表必须包装在<h:form> .

然而，在view范围内，这是不需要的，奇怪…

谢谢您的合作，谢谢。