Vaadin 8 设置会话超时

Vaadin 8 set session timeout

如何在 Vaadin 8 中设置会话超时?

我没有使用 web.xml,这是在框架的早期版本中设置它的地方。

会话超时设置在 web.xml。

如果您没有,则需要创建一个。

How do i set session timeout in seconds in web.xml?

由于您似乎使用 spring 启动,那么这可能适用于您

tl;博士

您可以将标准 Servlet 会话的超时设置为 int 整秒数,从包装中提取后 VaadinSession

VaadinSession.getCurrent().getSession().setMaxInactiveInterval ( ( int ) TimeUnit.MINUTES.toSeconds( 30 ) ) ;

以编程方式设置会话超时

设置 session timeout is a feature in your web container, your Servlet engine, such as Tomcat, Jetty, etc. The Servlet 规范将此行为定义为 Java 应用程序作为其会话处理的一部分。

Vaadin 将 Servlet 会话包装在 VaadinSession. So extract the regular Servlet session from Vaadin as a WrappedSession, then call the setMaxInactiveInterval 方法中以设置过期时间。

将时间限制指定为整数秒数。 TimeUnit 枚举可以很方便地计算秒数,而无需求助于 “magic” numbers.

VaadinSession               // Wraps a standard Servlet session.
.getCurrent()               // Access the current user’s session.
.getSession()               // Access the wrapped standard Servlet session.
.setMaxInactiveInterval(    // Set the timeout.
    ( int )                 // Cast a `long` to an `int`.
    TimeUnit                // The `TimeUnit` enum is more self-documenting than using a literal integer number.
    .MINUTES                // Here we set a half hour, 30 minutes.
    .toSeconds( 30 )        // Set a number of whole seconds.      
)
;

这是从 Maven 原型创建的 Vaadin 8.5 应用程序的完整示例 vaadin-archetype-application。我们在 init 方法的开头添加了一行。

package com.basilbourque.example;

import javax.servlet.annotation.WebServlet;

import com.vaadin.annotations.Theme;
import com.vaadin.annotations.VaadinServletConfiguration;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.server.VaadinSession;
import com.vaadin.ui.Button;
import com.vaadin.ui.Label;
import com.vaadin.ui.TextField;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;

import java.util.concurrent.TimeUnit;

/**
 * This UI is the application entry point. A UI may either represent a browser window
 * (or tab) or some part of an HTML page where a Vaadin application is embedded.
 * <p>
 * The UI is initialized using {@link #init(VaadinRequest)}. This method is intended to be
 * overridden to add component to the user interface and initialize non-component functionality.
 */
@Theme ( "mytheme" )
public class MyUI extends UI {

    @Override
    protected void init ( VaadinRequest vaadinRequest ) {
        // Set Session timeout programmatically. Overrides the default timeout configured for Servlet.
        VaadinSession.getCurrent().getSession().setMaxInactiveInterval( ( int ) TimeUnit.MINUTES.toSeconds( 45 ) );  // Setting timeout of 45 minutes = ( 45 * 60 ) seconds.

        final VerticalLayout layout = new VerticalLayout();

        final TextField name = new TextField();
        name.setCaption( "Type your name here:" );

        Button button = new Button( "Click Me" );
        button.addClickListener( e -> {
            layout.addComponent( new Label( "Thanks " + name.getValue()
                                                + ", it works!" ) );
        } );

        layout.addComponents( name , button );

        setContent( layout );
    }

    @WebServlet ( urlPatterns = "/*",
        name = "MyUIServlet",
        asyncSupported = true )
    @VaadinServletConfiguration ( ui = MyUI.class,
        productionMode = false )
    public static class MyUIServlet extends VaadinServlet {
    }
}

Servlet,不是 Vaadin

I am not using web.xml, which has been the place to set it in prior versions of the framework.

其实会话超时是Servlet的事情,不是Vaadin特有的事情。 web.xml 是 Servlet 的东西,而不是特定于 Vaadin 的东西。

参见:

How to set session timeout dynamically in Java web applications? 中进一步讨论。