"Tomcat and Java Web Development technology detailed" mind map

The more you want to build the superstructure, the more you feel the underlying foundation is important. Lesson series.

Book is a conscience book, is too basic, is suitable for making up a lesson.

"Text Version"

Tomcat and the Java Web
Development Technology Detailed

Servlet

The life cycle of the servlet

Initialization

1Servlet Container loading servlet class

2Servlet container Create ServletConfig, initialize configuration information

3Servlet Container Creation Servlet Object

4Servlet container calls the Servlet object's init (servletconfig)

Opportunity: First requested or configured <load-on-startup>

Run-time

Receive requests encapsulate ServletRequest and Servletresponse

Call Service ()

Generating response results from Servletresponse

Destroyed

Call Destroy ()

Destroying a Servlet object

Destroy the corresponding ServletConfig

Context of the app Serletcontext

A webapp corresponds to a serletcontext

Monitoring Interface Servletcontextlistener

Contextinitialized (servletcontextevent)

Contextdestroyed (servletcontextevent)

The life cycle of httpsession

Create

The first time the browser accesses the app

The last session of the browser was destroyed, but the app is accessed again

Browser access without the last session ID

Destroyed

Server Call Invalidate ()

Session Expiration

The server cannot directly know that the browser is terminated

Setmaxinactiveinterval (int)

Function range

Request.getsession ()

The session data can be shared as long as it can be taken to the conversation object

Listener interface for the session

Configuration in Web. xml

Httpsessionlistener Monitoring creation and destruction

Httpsessionattributelistener Monitoring Property changes

Depositing sessions as attribute objects

Httpsessionbindinglistener the binding of the Listener property

Httpsessionactivationlistener listening session activation and shelving

Filter filters

Call in series in sequence in Web. xml

Chain.dofilter () recursive invocation

Call relationship is Filter1->filter2->...->servlet

Thereafter the return is filter1<-filter2<-... <-servlet

Req and resp packaging for Servletrequestwrapper and Servletresponsewrapper

Xml

Load order

ServletContext (Context-parm)->listener->filter->servlet

Other (slightly)

Tomcat

Three modes of operation

Standalone

Jvm->tomcat->servlet container

Other server process content device (JNI)

Tomcat is divided into Web plugin and servlet container two parts

The JVM that the container component runs inside the other server

The Web plugin is also in this server

The Web plugin invokes the container component through JNI

Other server out-of-process containers (IPC)

Tomcat is divided into Web plugin and servlet container two parts

Container components run in standalone JVM

Server does not need to support servlet

Web plug-in runs on the server

The Web plugin calls the container component through the IPC

Server.xml

Server, Service, Engine, Host (abbreviated)

Context

ClassName: Can specify an implementation class

Path: URL entry for the app

DocBase: File path for the app

Reloadable: Automatic monitoring of updates and reloading (but increased running load)

Cookies: Allow a cookie to support the session

Usenaming: Support Jndi

Manager Session Manager

Default Standardmanager

A class package that can be joined to memcached for centralized session management

Cluster cluster

Engine to add <Cluster> and configure Deltamanager (or other implementations)

Enable <distributable/> in the app's Web. xml

Properties to be stored in session to implement the serialization interface

Network Environment Support Multicast

Connector

Listening port

AJP protocol

Configure SSL

JK Connectors

Access Tomcat through the AJP protocol

As plug-ins can be integrated in servers such as Apache,iis

Relm Security Domain

Enabling authentication at the Tomcat level

There are different implementations of configuration files, JDBC, DataSource, etc.

Valve Valves

Engine, host, and context three range of functions

The implementation of Tomcat's own band

Customer Access Log Valve

Remote Address Filter

Remote host Filter

Customer Request Recorder

SSI (Server Side Include)

Often used for web-page stitching, such as headers and footer

Just a few simple instructions.

Realized in the form of Ssiservlet

of Web applications
Several invocation methods

Ejb

Java EE application structure

Customer tier (browser or client)

Web layer (JSP and servlet)

Business Layer (EJB)

Session bean-Logic

Have status

No status

Entity bean-entity

EIS layer (database)

Interface

Remote Interface Ejbobject

Home interface EJBHome

The Bean class implements the Sessionbean and implements the remote interface concretely.

Technology stack

Server: JBoss

Invocation method: RMI

Soap

WebService

SOAP: Data exchange protocol based on XML language

WSDL: Web Service Description Language based on XML language

Communication protocols

Http/https

Smtp/pop3

Invocation mode

Rpc

message-oriented

Technology stack

Web Services Framework: Apache AXIS

Server: Tomcat

MVC pattern

Level

Model: Business logic

Views: User Rendering

Controller

Receiving user requests

Call model to respond to user requests

Select View to display response results

Advantages: 3 modules are independent, loosely coupled

JSP Model 2

Servlet as Controller

JavaBean as a model

JSP as a view

Struts

Implementing the MVC Web framework

Controller

Filterdispatcher+struts.xml forward the request to the respective action

The action class focuses on the process of the control program

Velocity

The role of template language: Separating Java code from a Web page

Use of the engine

Servlet class Inheritance Velocityservlet

Overriding the HandleRequest method

Storing variables in the context object

Returns the specified template file

Extracurricular supplement: Several ways of remote communication

RPC: Remote Procedure Call

TCP connections

Application-layer Addressing (such as the URI address of HTTP)

Serialization and deserialization of requests and responses

RMI Remote Method invocation

Java language only

Strong objects

WebService

HTTP connection

SOAP protocol

Based on XML

RESTful style

Resource-oriented get/post/put/delete operations

(often using JSON-based data exchange)

Jms

Java Messaging Service

JSP and Jstl (slightly)

"Tomcat and Java Web Development technology detailed" mind map