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最新评论
-
霜花似雪:
博主可以分享一下源码吗?
使用maven构建web项目实例 -
王庆波-行:
很好的demo!
memcache使用实例 -
surpassno:
大写的牛逼
java可视化显示内存使用情况 -
zhulin0504:
怎么访问NetEcho.html页面呀???
applet与servlet的网络通信 -
springdata:
java多线程实例demo源代码下载:http://www.z ...
java多线程例子
Q: Explain the life cycle methods of a Servlet.
A: The javax.servlet.Servlet interface defines the three methods known as life-cycle method.
public void init(ServletConfig config) throws ServletException
public void service( ServletRequest req, ServletResponse res) throws ServletException, IOException
public void destroy()
First the servlet is constructed, then initialized wih the init() method.
Any request from client are handled initially by the service() method before delegating to the doXxx() methods in the case of HttpServlet.
The servlet is removed from service, destroyed with the destroy() methid, then garbaged collected and finalized.
TOP
Q: What is the difference between the getRequestDispatcher(String path) method of javax.servlet.ServletRequest interface and javax.servlet.ServletContext interface?
A: The getRequestDispatcher(String path) method of javax.servlet.ServletRequest interface accepts parameter the path to the resource to be included or forwarded to, which can be relative to the request of the calling servlet. If the path begins with a "/" it is interpreted as relative to the current context root.
The getRequestDispatcher(String path) method of javax.servlet.ServletContext interface cannot accepts relative paths. All path must sart with a "/" and are interpreted as relative to curent context root.
TOP
Q: Explain the directory structure of a web application.
A: The directory structure of a web application consists of two parts.
A private directory called WEB-INF
A public resource directory which contains public resource folder.
WEB-INF folder consists of
1. web.xml
2. classes directory
3. lib directory
TOP
Q: What are the common mechanisms used for session tracking?
A: Cookies
SSL sessions
URL- rewriting
TOP
Q: Explain ServletContext.
A: ServletContext interface is a window for a servlet to view it's environment. A servlet can use this interface to get information such as initialization parameters for the web applicationor servlet container's version. Every web application has one and only one ServletContext and is accessible to all active resource of that application.
TOP
Q: What is preinitialization of a servlet?
A: A container doesnot initialize the servlets ass soon as it starts up, it initializes a servlet when it receives a request for that servlet first time. This is called lazy loading. The servlet specification defines the <load-on-startup> element, which can be specified in the deployment descriptor to make the servlet container load and initialize the servlet as soon as it starts up. The process of loading a servlet before any request comes in is called preloading or preinitializing a servlet.
[ Received from Amit Bhoir ] TOP
Q: What is the difference between Difference between doGet() and doPost()?
A: A doGet() method is limited with 2k of data to be sent, and doPost() method doesn't have this limitation. A request string for doGet() looks like the following:
http://www.allapplabs.com/svt1?p1=v1&p2=v2&...&pN=vN
doPost() method call doesn't need a long text tail after a servlet name in a request. All parameters are stored in a request itself, not in a request string, and it's impossible to guess the data transmitted to a servlet only looking at a request string.
[ Received from Amit Bhoir ] TOP
Q: What is the difference between HttpServlet and GenericServlet?
A: A GenericServlet has a service() method aimed to handle requests. HttpServlet extends GenericServlet and adds support for doGet(), doPost(), doHead() methods (HTTP 1.0) plus doPut(), doOptions(), doDelete(), doTrace() methods (HTTP 1.1).
Both these classes are abstract.
[ Received from Amit Bhoir ] TOP
Q: What is the difference between ServletContext and ServletConfig?
A: ServletContext: Defines a set of methods that a servlet uses to communicate with its servlet container, for example, to get the MIME type of a file, dispatch requests, or write to a log file.The ServletContext object is contained within the ServletConfig object, which the Web server provides the servlet when the servlet is initialized
ServletConfig: The object created after a servlet is instantiated and its default constructor is read. It is created to pass initialization information to the servlet.
[ Received from Sivagopal Balivada ]
A: The javax.servlet.Servlet interface defines the three methods known as life-cycle method.
public void init(ServletConfig config) throws ServletException
public void service( ServletRequest req, ServletResponse res) throws ServletException, IOException
public void destroy()
First the servlet is constructed, then initialized wih the init() method.
Any request from client are handled initially by the service() method before delegating to the doXxx() methods in the case of HttpServlet.
The servlet is removed from service, destroyed with the destroy() methid, then garbaged collected and finalized.
TOP
Q: What is the difference between the getRequestDispatcher(String path) method of javax.servlet.ServletRequest interface and javax.servlet.ServletContext interface?
A: The getRequestDispatcher(String path) method of javax.servlet.ServletRequest interface accepts parameter the path to the resource to be included or forwarded to, which can be relative to the request of the calling servlet. If the path begins with a "/" it is interpreted as relative to the current context root.
The getRequestDispatcher(String path) method of javax.servlet.ServletContext interface cannot accepts relative paths. All path must sart with a "/" and are interpreted as relative to curent context root.
TOP
Q: Explain the directory structure of a web application.
A: The directory structure of a web application consists of two parts.
A private directory called WEB-INF
A public resource directory which contains public resource folder.
WEB-INF folder consists of
1. web.xml
2. classes directory
3. lib directory
TOP
Q: What are the common mechanisms used for session tracking?
A: Cookies
SSL sessions
URL- rewriting
TOP
Q: Explain ServletContext.
A: ServletContext interface is a window for a servlet to view it's environment. A servlet can use this interface to get information such as initialization parameters for the web applicationor servlet container's version. Every web application has one and only one ServletContext and is accessible to all active resource of that application.
TOP
Q: What is preinitialization of a servlet?
A: A container doesnot initialize the servlets ass soon as it starts up, it initializes a servlet when it receives a request for that servlet first time. This is called lazy loading. The servlet specification defines the <load-on-startup> element, which can be specified in the deployment descriptor to make the servlet container load and initialize the servlet as soon as it starts up. The process of loading a servlet before any request comes in is called preloading or preinitializing a servlet.
[ Received from Amit Bhoir ] TOP
Q: What is the difference between Difference between doGet() and doPost()?
A: A doGet() method is limited with 2k of data to be sent, and doPost() method doesn't have this limitation. A request string for doGet() looks like the following:
http://www.allapplabs.com/svt1?p1=v1&p2=v2&...&pN=vN
doPost() method call doesn't need a long text tail after a servlet name in a request. All parameters are stored in a request itself, not in a request string, and it's impossible to guess the data transmitted to a servlet only looking at a request string.
[ Received from Amit Bhoir ] TOP
Q: What is the difference between HttpServlet and GenericServlet?
A: A GenericServlet has a service() method aimed to handle requests. HttpServlet extends GenericServlet and adds support for doGet(), doPost(), doHead() methods (HTTP 1.0) plus doPut(), doOptions(), doDelete(), doTrace() methods (HTTP 1.1).
Both these classes are abstract.
[ Received from Amit Bhoir ] TOP
Q: What is the difference between ServletContext and ServletConfig?
A: ServletContext: Defines a set of methods that a servlet uses to communicate with its servlet container, for example, to get the MIME type of a file, dispatch requests, or write to a log file.The ServletContext object is contained within the ServletConfig object, which the Web server provides the servlet when the servlet is initialized
ServletConfig: The object created after a servlet is instantiated and its default constructor is read. It is created to pass initialization information to the servlet.
[ Received from Sivagopal Balivada ]
发表评论
-
数据库及struts面试题
2011-06-22 11:07 1059数据库部分 Q: What is SQL? ... -
EJB面试题
2011-06-22 10:54 1125Q: What are the different kinds ... -
java中JSP的面试题
2011-06-22 10:22 1542Q: What is a output comment? (可 ... -
java中的集合面试题
2011-06-22 10:12 720Q: What is the Collections API? ... -
彻底搞清楚java的内部类
2011-06-15 10:47 1504内部类允许在一个类中 ... -
细说java(java中的浮点数十六进制表示)
2011-06-12 16:48 3562java中浮点数不能用八进制表示,但可以用十六进制表示,只能用 ... -
SCJP试题
2011-06-09 16:14 1175package scjp; public class T ... -
java面试题解惑 之 继承、多态、重载、重写
2011-06-03 09:36 1298继承、多态、重载、重写 继承 java中有三种类:类,抽象类, ... -
java面试题解惑 之 多线程
2011-06-02 17:24 9901,多线程 线程或者说 ... -
java面试题解惑 之变量初始顺序,变量覆盖,字符串池,final,finally区别
2011-06-02 16:26 7971,变量初始化顺序 package com.qdu.sun; ... -
java解惑(Map的使用,静态导入方法,线程中断interrupted与线程死锁)
2011-05-17 12:38 1396Map的使用 package other; import ... -
java 继承的一个问题(想不明白)
2011-04-13 17:03 915java中的继承问题,以为是学会了java,结果最简单的一个j ... -
java解惑(谜题76。。)
2011-03-09 11:22 1221谜题76:乒乓public class PingPong { ... -
java解惑(谜题60,65)
2011-03-08 15:52 918一行以毙之 1,编写一个 ... -
java解惑(谜题66。。。)
2011-02-28 20:54 950谜题66:一件私事 class Base{ public ... -
java解惑(谜题61。。。)
2011-02-28 20:17 914谜题61:日期游戏 import java.util.Cal ... -
java解惑(谜题56到。。库之谜)
2011-02-28 19:41 858谜题56:大问题 import jav ... -
java解惑(谜题49。。)
2011-02-27 10:52 954谜题49:比生命更大 import java.util.Cal ... -
java解惑(谜题41到谜题)
2011-02-27 10:18 920谜题41:域和流 下面的 ... -
谜题36-谜题
2011-02-25 10:55 898谜题36:优柔寡断 public ...
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