moven的学习

目录结构优先。。。。。。

|--pom.xml

|--src

    |--main

        |--java

            |--com

                |--mydomain

                    |--TestServlet.java

        |--resources

        |--webapp

            |--index.jsp

            |--WEB-INF

                |--web.xml

       在这个测试项目里面，文件非常少，把单元测试文件夹暂时省了，有需要可以根据我其它几个EJB实例里讲到的，添加进去，简单点有利于初学的人去大概了解一下maven，高手就别在这转了，不适合你，呵呵。

       其实我没写什么代码，就一个文件名为TestServlet.java的Servlet，其它的都是文件夹，index.jsp也写上Hello World几个字，有需要可以自己加！再加上在web.xml里配置了几行，就这样，其实就是方便大家了解Maven，至于稍深一点的，往后会写，再稍深一点的，我不会，谢谢合作！



       好了，下面就把TestServlet.java文件代码贴出来看看

package com.mydomain;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//extend HttpServlet这个类，就是一个Servlet了
public class TestServlet extends HttpServlet
{

    @Override
    protected void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException
    {

        //通常学习的话doGet跟doPost就用下面这种方式将它们合并起来玩就行了
        doPost(httpServletRequest, httpServletResponse);
    }

    @Override
    protected void doPost(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException
    {

        //下面这些代码输出一些非常基本的信息，大家可以忽略它
        String contextPath = httpServletRequest.getContextPath();
        String authType = httpServletRequest.getAuthType();
        String charactorEncoding = httpServletRequest.getCharacterEncoding();
        String contentType = httpServletRequest.getContentType();
        String method = httpServletRequest.getMethod();
        String pathInfo = httpServletRequest.getPathInfo();
        String pathTranslated = httpServletRequest.getPathTranslated();
        String protocol = httpServletRequest.getProtocol();
        String queryString = httpServletRequest.getQueryString();
        String remoteAddress = httpServletRequest.getRemoteAddr();
        String remoteHost = httpServletRequest.getRemoteHost();
        String remoteUser = httpServletRequest.getRemoteUser();
        String requestURI = httpServletRequest.getRequestURI();
        String requestedSessionId = httpServletRequest.getRequestedSessionId();
        String scheme = httpServletRequest.getScheme();
        String serverName = httpServletRequest.getServerName();
        String servletPath = httpServletRequest.getServletPath();
       

        //将信息输出到页面上
        PrintWriter printWriter = httpServletResponse.getWriter();
        printWriter.println("contextPath = " + contextPath);
        printWriter.print("<br />");
        printWriter.println("authType = " + authType);
        printWriter.print("<br />");
        printWriter.println("charactorEncoding = " + charactorEncoding);
        printWriter.print("<br />");
        printWriter.println("contentType = " + contentType);
        printWriter.print("<br />");
        printWriter.println("method = " + method);
        printWriter.print("<br />");
        printWriter.println("pathInfo = " + pathInfo);
        printWriter.print("<br />");
        printWriter.println("pathTranslated = " + pathTranslated);
        printWriter.print("<br />");
        printWriter.println("protocol = " + protocol);
        printWriter.print("<br />");
        printWriter.println("queryString = " + queryString);
        printWriter.print("<br />");
        printWriter.println("remoteAddress = " + remoteAddress);
        printWriter.print("<br />");
        printWriter.println("remoteHost = " + remoteHost);
        printWriter.print("<br />");
        printWriter.println("remoteUser = "+ remoteUser);
        printWriter.print("<br />");
        printWriter.println("requestURI = " + requestURI);
        printWriter.print("<br />");
        printWriter.println("requestedSessionId = " + requestedSessionId);
        printWriter.print("<br />");
        printWriter.println("scheme = " + scheme);
        printWriter.print("<br />");
        printWriter.println("serverName = " + serverName);
        printWriter.print("<br />");
        printWriter.println("servletPath = " + servletPath);
    }
   
}



下面则是web.xml文件，非常简单的

<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>

  <!--每添加一个新的servlet，下面两段都是必不可少的，复制下来修改一下就OK了-->
  <servlet>
      <servlet-name>Test Servlet</servlet-name>
      <servlet-class>com.mydomain.TestServlet</servlet-class>
  </servlet>
  <servlet-mapping>
      <servlet-name>Test Servlet</servlet-name>
      <url-pattern>/TestServlet</url-pattern>
  </servlet-mapping>
</web-app>

当然，Maven项目少不了pom文件，也贴出来吧，给大家剪剪

<?xml version="1.0" encoding="UTF-8"?>

<!--下面这段直接复制就OK了，如果想了解为啥这样写，可以去查查xml schema-->
<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">

    <!--pom文件的版本号，通常不用改，以后要改是以后的事-->
    <modelVersion>4.0.0</modelVersion>

    <!--你的组织的名称，大多是放域名倒序，为什么是倒序？这得要去了解Maven的repository概念罗-->
    <groupId>com.mydomain</groupId>

    <!--项目名称-->
    <artifactId>wartest</artifactId>

    <!--将要打包的形式，这里为war，web archive-->
    <packaging>war</packaging>

    <!--下面是当前项目的版本-->
    <version>1.0-SNAPSHOT</version>
    <name>Maven Webapp Test</name>
    <url>http://maven.apache.org</url>
    <dependencies>

        <!--新建maven项目都会有下面这个defendant，太可不必删它，可以提醒你要写单元测试哦-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <!--就加下面这个defendant就OK了-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.3</version>
        </dependency>
    </dependencies>
    <build>

        <!--下面一句可不写的，不过写上的话，最后生成的war名称就是wartest.war-->
        <finalName>wartest</finalName>

        <!--Maven就是通下面这种插件的形式去不断扩展它自身的功能的，非常强哦，当然使用起来会a little pain-->
        <plugins>

            <!--插件1-->
            <plugin>

                <!--插件名称-->
                <artifactId>maven-compiler-plugin</artifactId>

                <!--插件版本-->
                <version>2.0.2</version>

                <!--插件设置，通常也是参数-->
                <configuration>

                    <!--下面两段意思是生成代码支持JDK1.5到1.5，就是1.5嘛，当然你也可以根据实际需要修改的-->
                    <source>1.5</source>
                    <target>1.5</target>

                    <!--编译编码，大家支持UTF-8吧，前段时间我搞编码搞怕了-->
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>

            <!--插件2-->
            <plugin>
                <artifactId>maven-resources-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>



好了，写完了，下面进到项目根目录，运行一下

mvn install



就可以在根目录的target得到一个wartest.war了，把它放到Tomcat里面，或者Jboss里面，或者任何其它Web container都可以的，怎么样mvn 还算容易吧