使用有状态会话作用域bean在JSF应用程序中存储用户登录信息

很好的一天

这个问题已经在创建MCVE时解决(感谢Kukeltje让我这样做:)

请参阅下面的答案,了解一个有效的mcve。

@SessionScoped
@Stateful
public class StoringUserInfo implements Serializable {

    private HashMap<String, String> userSettingMap;
    private String userName = "Test";

    public StoringUserInfo() {
        this.userSettingMap = new HashMap<>();
    }

    public void addSetting(String name, String setting) {
        userSettingMap.put(name, setting);
    }

    public String getSetting(String name) {
        return userSettingMap.get(name);
    }

    public HashMap<String, String> getUserSettingMap() {
        return userSettingMap;
    }

    public void setUserSettingMap(HashMap<String, String> userSettingMap) {
        this.userSettingMap = userSettingMap;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String projectName) {
        this.projectName = userName;
    }
}

例如,在一个@viewscoped@named bean中,我想这样做:

@Named
@ViewScoped
public class NewProjectView implements Serializable {

    private static final long serialVersionUID = 1L;
    private String userName;
    @Inject private transient StoringUserInfo userInfo;

    public void submitForm(){
        userInfo.setUserName("NEW")
        // return to dashboard
        FacesContext.getCurrentInstance().getViewRoot().getViewMap().clear();
        PrimeFaces.current().ajax().update(":content", ":formHeader:mainMenu", ":formHeader:growl");
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

}

然后,在另一个@viewscoped@named bean上,我希望检索存储的值(由于@postconstruct获取空值,尝试取消应用程序部署中的错误)

@Named
@ViewScoped
public class EditProjectView implements Serializable {

    private static final long serialVersionUID = 1L;
    private String userName;
    @Inject private transient StoringUserInfo userInfo;


    @PostConstruct
    public void init() {
        getValues()
    }

    private void getValues(){
    try {
        userName = userInfo.getUserName(); // this must display on form load
    } catch (Exception e) {
        e.printStackTrace();
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

}

应用程序内部的工作流确保在需要值的页面之前访问设置值的页面。调试也正确地显示了这一点。

但是,@viewscoped@命名bean始终显示为空,它们从不从@sesionscoped bean重新读取值?我这里缺什么?

在@sessionscoped@stateful bean中为用户名字符串设置默认值将在第二个表单上显示名称“test”。

但是,更新后的值在表单呈现/加载时永远不会被读取。因此,@postconstruct似乎只在应用程序部署时执行?

我还将它添加到我的XHTML文件中:

<o:form id="editProjectForm">
        <f:metadata>
            <f:viewAction action="#{editProjectView.getProjectValues}"/>
            <p:ajax update="editProjectFieldSet"/>
        </f:metadata>
        <p:fieldset id="editProjectFieldSet" legend="#{editProjectView.userName}"/>

但在呈现之前,它仍然不重新查询sessionscoped bean。它只显示默认的初始值“test”