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SESSION域中的对象状态即将要被绑定到session中的对象有几种状态绑定状态：就一个对象被放到session域中解绑状态：就是这个对象从session域中移除了钝化状态：是将session内存中的对象持久化（序列化）到磁盘活化状态：就是将磁盘上的对象再次恢复到session内存中上一节只是针对...

07JavaWeb基础 - ServletContext对象

ServletContext对象什么是ServletContext对象ServletContext代表是一个web应用的环境（上下文）对象，ServletContext对象内部封装是该web应用的信息，ServletContext对象一个web应用只有一个。ServletContext对象的生命周期...

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[帮助文档] 如何使用Java堆分析对象查询语言OQL

1. OQL语法OQL语法如下：SELECT * FROM [ INSTANCEOF ] [ WHERE ]2. 语法各子句说明select部分SELECT toString(x), x.value, x....

JavaWeb的四大域对象

JavaWeb的四大域对象四个域的作用域范围大小:PageContext （page域） < request < session < servletContext（application域）一、ServletContext1、生命周期：当Web应用被加载进容器时创建代表整个web应...

JavaWeb中的四大作用域对象

JavaWeb中的四大作用域对象一、page对象有效范围pageContext：只在一个页面中保存属性，跳转后无效作用：代表jsp中二、request对象作用：提供对请求数据的访问，提供用于加入特定请求数据访问有效范围：只在第一次请求中保存，服务器跳转有效，客户端跳转无效主要用于处理用...

javaweb ServletContext对象

web容器在启动的时候，它会为每个web程序都创建一个对应的ServletContext对象，他代表了当前的web应用；* 共享数据我在这个Sevlet中保存的数据数据，可以在另外一个servlet中拿到；public class HelloServlet extends HttpServlet ...

[帮助文档] 管道任务同步读取源表时报错java.sql.SQLExceptionORA-08103

问题描述Dataphin管道任务同步读取源表时，报错“java.sql.SQLException: ORA-08103: 对象不再存在”;源表是存在的。问题原因管道任务同步读取源表时，另一个用户在全量更新该源表，即有一个进程truncate，insert动作，而同时有另一进程对同一表做select动...

JavaWeb - request 对象中 getContextPath() 方法介绍

JavaWeb中四大域对象的作用范围

JavaWeb的四大作用域为：PageContext，ServletRequest，Session，ServletContext；PageContext域：作用范围是整个JSP页面，是四大作用域中最小的一个；生命周期是当对JSP的请求时开始，当响应结束时销毁。Servle...

请问Javaweb中不同对象之间的三种关联关系是什么？

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