Struts2基礎

1，概念：       

    （1）開源框架，目的是爲了減小在運用MVC設計模型來開發Web應用的時間。經過採用JavaServlet/JSP技術，實現了基於Java EEWeb應用的MVC設計模型的應用框架，是MVC經典設計模式中的一個經典產品

    （2）輕量級的MVC框架，主要解決了請求分發的問題，重心在控制層和表現層。低侵入性，與業務代碼的耦合度很低。Struts2實現了MVC，並提供了一系列API，採用模式化方式簡化業務開發過程

2，結構圖：

3，須要的依賴：  

<dependency>
    <groupId>asm</groupId>
    <artifactId>asm-commons</artifactId>
    <version>3.3</version>
</dependency>

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.1</version>
</dependency>

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.3.1</version>
</dependency>

<dependency>
    <groupId>commons-logging</groupId>
    <artifactId>commons-logging-api</artifactId>
    <version>1.1</version>
</dependency>

<dependency>
    <groupId>org.freemarker</groupId>
    <artifactId>freemarker</artifactId>
    <version>2.3.23</version>
</dependency>


<dependency>
    <groupId>javassist</groupId>
    <artifactId>javassist</artifactId>
    <version>3.11.0.GA</version>
</dependency>

<dependency>
    <groupId>ognl</groupId>
    <artifactId>ognl</artifactId>
    <version>3.0.6</version>
</dependency>

<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-core</artifactId>
    <version>2.3.24</version>
</dependency>

<dependency>
    <groupId>org.apache.struts.xwork</groupId>
    <artifactId>xwork-core</artifactId>
    <version>2.3.24</version>
</dependency>

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.1.0</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-convention-plugin</artifactId>
    <version>2.3.24</version>
</dependency>

4，web.xml

<!--配置struts2的核心控制器-->
<filter>
  <filter-name>struts2</filter-name>
  <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
  <filter-name>struts2</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>