maven 下struts 框架搭建（系列一）

记忆随着季节轮回，留下几只脚印。

本人开发环境为win7 ，开发工具eclipse；jre1.8.0_31

下载的包大多数都是最新版本~当然只限于2015的最新~

jdk struts2等安装此处省略。

1.maven安装与环境配置，问一下度娘~或点击下面链接：

http://www.cnblogs.com/smile2010/archive/2011/11/22/2259535.html

http://blog.csdn.net/yyywyr/article/details/20304169

2.eclipse maven上配置：

http://jingyan.baidu.com/article/5d368d1e306a913f61c05743.html

3.项目开发

3.1项目创建

首先创建maven project，问度娘~这个有很多

创建完后生成目录如下

3.2配置文件

3.2.1  pom.xml的配置

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">  <modelVersion>4.0.0</modelVersion>  <groupId>qq</groupId>  <artifactId>testSSM</artifactId>  <packaging>war</packaging>  <version>0.0.1-SNAPSHOT</version>  <name>testSSM Maven Webapp</name>  <url>http://maven.apache.org</url>  <properties>  <spring.version>4.1.5.RELEASE</spring.version>  <mybatis.version>3.2.8</mybatis.version>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  </properties>  <dependencies>    <dependency>      <groupId>junit</groupId>      <artifactId>junit</artifactId>      <version>3.8.1</version>      <scope>test</scope>    </dependency>    <!-- 导入java ee jar 包 --><dependency><groupId>javax</groupId><artifactId>javaee-api</artifactId><version>7.0</version></dependency><!-- 导入struts 包 -->     <dependency>          <groupId>org.apache.struts</groupId>          <artifactId>struts2-core</artifactId>          <version>2.3.4</version>      </dependency>      <dependency>          <groupId>org.apache.struts</groupId>          <artifactId>struts2-json-plugin</artifactId>          <version>2.3.4</version>      </dependency>     <dependency>        <groupId>commons-lang</groupId>        <artifactId>commons-lang</artifactId>        <version>2.6</version>        <scope>provided</scope>      </dependency>    <!-- 导入mybatis包 -->    <dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.2.6</version>     </dependency><!-- mybatis/spring包 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.2.2</version></dependency><!-- mybatis核心包 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>${mybatis.version}</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><!-- spring核心包 --><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-oxm</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aop</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context-support</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>${spring.version}</version></dependency>  </dependencies>  <build>    <finalName>testSSM</finalName>  </build></project>

当然上面代码也包含了spring和mybatis的依赖包。maven管理下的项目好像不允许将jar包直接粘贴到lib里，通过配置dependency会把相应的包自动下载下来。如果需要特别配置，以下博客提供了两种方式。

http://liugang594.iteye.com/blog/1677712

pom.xml详解，可以点击以下链接，写的很详细：

http://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html#Dependency_Scope

http://blog.csdn.net/longeremmy/article/details/9670619

http://my.oschina.net/zh119893/blog/232896

3.2.2 struts.xml配置文件

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN""http://struts.apache.org/dtds/struts-2.3.dtd"><struts>    <constant name="struts.enable.DynamicMethodInvocation" value="false" />    <constant name="struts.devMode" value="true" />    <package name="default" namespace="/" extends="json-default">        <default-action-ref name="index" />        <global-results>            <result name="error">/WEB-INF/jsp/error.jsp</result>        </global-results>        <global-exception-mappings>            <exception-mapping exception="java.lang.Exception" result="error"/>        </global-exception-mappings>        <action name="Hello" class="testStruts.HelloWorld" method="Hello">            <result type="json"></result>        </action>    </package>    <!-- Add packages here --></struts>

这个配置文件是从struts blank里边拷贝过来的，里面添加了一个action，是下面java文件的一个配置。注意package里边继承了json-default；

3.2.3 web.xml文件配置

<?xml version="1.0" encoding="UTF-8"?><web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">    <display-name>Struts Blank</display-name>    <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>    <welcome-file-list>        <welcome-file>index.html</welcome-file>    </welcome-file-list></web-app>

这个配置文件是从struts blank里边拷贝过来的，没有特别之处。
3.3 测试程序

3.3.1 java代码

<pre name="code" class="java">package testStruts;import com.opensymphony.xwork2.ActionSupport;public class HelloWorld extends ActionSupport {/** *  */private static final long serialVersionUID = 1L;private String msg;private String json;public String Hello(){if(msg==null)    System.out.println("the msg is null");else System.out.println("the msg is"+msg);json="just a test";return SUCCESS;}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}public String getJson() {return json;}public void setJson(String json) {this.json = json;}}

注意struts里边传参，要把属性的setter和getter方法写上，当然这只是方法之一。后话，在加上spring之后，为了安全以及负载性选择性的把一些属性暴露出来，也就是说setter和getter方法选择性的添加。

此类继承了ActionSupport，当然实现方式不止这一种方式。一本书写的不错，推荐一下~《struts2 in action》里面写的原理很详细~

        <action name="Hello" class="testStruts.HelloWorld" method="Hello">            <result type="json"></result>        </action>

这是配置文件里的相关配置，回调方法是hello，当然由于回调方法返回了一个常量SUCCESS，是result的name默认值，所以执行成功会返回type为json的数据。

3.3.2 jsp页面

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"    pageEncoding="UTF-8"%><html><body><h2>Hello World!</h2><form action="Hello" method="get"><input name="msg"  type="text"><input type="submit" value="Submit" /></form></body></html>

action指定将form提交后的数据转给Hello的action，submit之后会以get方式在struts.xml里找name为Hello的action执行。

3.3运行结果：

web返回的结果

{"json":"just a test","msg":"546464"}