Java 憤怒鳥

2011年8月16日星期二

private final 方法可以被覆蓋 (Override)

A 類別程式中, f() 及 g() 這二個方法, 因宣告為 private, 在繼承的關係中是不會被繼承, 所以根本沒覆蓋的討論, 下面程式範例, 編譯會過, 既使 B 類別程式中有相同宣告的 f() 及 g() 這二個方法

class A {

   // Identical to "private" alone:
   private final void f() {
     System.out.println("A.f()");
   }

   // Also automatically "final":
   private void g() {
     System.out.println("A.g()");
   }
}

class B extends A {
   private final void f() {
     System.out.println("B.f()");
   }

   private void g() {
     System.out.println("B.g()");
   }
}

在繼承關係中, 變數是沒有覆蓋 (Override) 的討論, 而是以 shadow 來討論, 以下範例程式, 編譯是會通過, 因沒有覆蓋討論, I 介面中的變數 KEY 既使宣告 final, A 類別一樣可以宣告同名的變數 KEY.

public interface I {
    public final String KEY = "a";
}

public class A implements I {
   public String KEY = "b";

   public String getKey() {
      return KEY;
   }
}

參考文章
1. Why can final constants in Java beoverriden ?
http://stackoverflow.com/questions/205239/why-can-final-constants-in-java-be-overriden

2011年8月6日星期六

Apache Maven 專案管理平台 - WAR 專案加入 Servlet

初設 AServlet 專案

$ mvn archetype:create -DgroupId=kvm.servlet -DartifactId=AServlet -DarchetypeArtifactId=maven-archetype-webapp

AServlet 專案目錄結構
$ tree AServlet/
AServlet/
|-- pom.xml
`-- src
`-- main
|-- resources
`-- webapp
|-- WEB-INF
| `-- web.xml
`-- index.jsp

5 directories, 3 files

產生 kvm.servlet 套件目錄

$ mkdir -p AServlet/src/main/java/kvm/servlet

撰寫 SimpleServlet.java 程式

$ nano AServlet/src/main/java/kvm/servlet/SimpleServlet.java
package kvm.servlet;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class SimpleServlet extends HttpServlet {
   public void doGet(HttpServletRequest request,
                               HttpServletResponse response)
   throws ServletException, IOException {
PrintWriter out = response.getWriter();
      out.println( "SimpleServlet Executed" );
      out.flush();
      out.close();
   }
}

修改 AServlet 網站專案設定檔 - web.xml

$ nano AServlet/src/main/webapp/WEB-INF/web.xml

<!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>
    <servlet>
       <servlet-name>simple</servlet-name>
       <servlet-class>kvm.servlet.SimpleServlet</servlet-class>
    </servlet>
    <servlet-mapping>
       <servlet-name>simple</servlet-name>
       <url-pattern>/simple</url-pattern>
    </servlet-mapping>
</web-app>

第一次編譯 Servlet 程式
$ cd AServlet/
$ mvn compile
                                  :
[ERROR] /mnt/hda1/AServlet/src/main/java/kvm/servlet/SimpleServlet.java:[5,0] error: package javax.servlet.http does not exist
[ERROR] /mnt/hda1/AServlet/src/main/java/kvm/servlet/SimpleServlet.java:[7,35] error: cannot find symbol
[ERROR] class HttpServlet
[ERROR] /mnt/hda1/AServlet/src/main/java/kvm/servlet/SimpleServlet.java:[8,22] error: cannot find symbol
[ERROR] class SimpleServlet
[ERROR] /mnt/hda1/AServlet/src/main/java/kvm/servlet/SimpleServlet.java:[8,50] error: cannot find symbol
[ERROR] class SimpleServlet
[ERROR] /mnt/hda1/AServlet/src/main/java/kvm/servlet/SimpleServlet.java:[9,41] error: cannot find symbol
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

修改 pom.xml 設定檔

$ nano pom.xml

<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>kvm.servlet</groupId>
   <artifactId>AServlet</artifactId>
   <packaging>war</packaging>
   <version>1.0-SNAPSHOT</version>
   <name>AServlet Maven Webapp</name>
   <url>http://maven.apache.org</url>
   <dependencies>
      <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>
         <version>3.8.1</version>
         <scope>test</scope>
      </dependency>

      <dependency>
         <groupId>javax.servlet</groupId>
         <artifactId>servlet-api</artifactId>
         <version>2.4</version>
         <scope>provided</scope>
      </dependency>

   </dependencies>
   <build>
      <finalName>AServlet</finalName>
    </build>
</project>

再次編譯 servlet 程式
$ mvn compile
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building AServlet Maven Webapp 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
Downloading: http://repo1.maven.org/maven2/javax/servlet/servlet-api/2.4/servlet-api-2.4.pom
Downloaded: http://repo1.maven.org/maven2/javax/servlet/servlet-api/2.4/servlet-api-2.4.pom (156 B at 0.0 KB/sec)
Downloading: http://repo1.maven.org/maven2/javax/servlet/servlet-api/2.4/servlet-api-2.4.jar
Downloaded: http://repo1.maven.org/maven2/javax/servlet/servlet-api/2.4/servlet-api-2.4.jar (96 KB at 36.1 KB/sec)
[INFO]
[INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ AServlet ---
[WARNING] Using platform encoding (ANSI_X3.4-1968 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ AServlet ---
[WARNING] File encoding has not been set, using platform encoding ANSI_X3.4-1968, i.e. build is platform dependent!
[INFO] Compiling 1 source file to /mnt/hda1/AServlet/target/classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 8.557s
[INFO] Finished at: Sun Aug 07 09:25:48 UTC 2011
[INFO] Final Memory: 6M/17M
[INFO] ------------------------------------------------------------------------

製作 AServlet 專案檔

$ mvn package

上載 AServlet 專案檔至 Tomcat
$ cp target/AServlet.war /mnt/hda1/apache-tomcat-7.0.19/webapps/

SimpleServlet 程式測試
$ curl http://localhost:8080/AServlet/simple
SimpleServlet Executed

Apache Maven 專案管理平台 - WAR 專案加入 JSP

初設 AJSP 專案

$ mvn archetype:create -DgroupId=kvm.jsp -DartifactId=AJSP
-DarchetypeArtifactId=maven-archetype-webapp

Counter.java 資料物件設計

1. 建立 foo 套件目錄
$ mkdir -p AJSP/src/main/java/foo

2. 撰寫 Counter.java 程式

$ nano AJSP/src/main/java/foo/Counter.java
package foo;
public class Counter {
private static int count;
public static synchronized int getCount() {
     count++;
     return count;
}
}

撰寫 MyJSP01.jsp
$ nano AJSP/src/main/webapp/MyJSP01.jsp
<html>
<body>
The Page count is :
<%
out.println(foo.Counter.getCount());
%>
</body>
</html>

製作 AJSP 專案檔 (AJSP.war)
$ cd AJSP
$ mvn package
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building AJSP Maven Webapp 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ AJSP ---
[WARNING] Using platform encoding (ANSI_X3.4-1968 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ AJSP ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:2.4.3:testResources (default-testResources) @ AJSP ---
[WARNING] Using platform encoding (ANSI_X3.4-1968 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /mnt/hda1/AJSP/src/test/resources
[INFO]
[INFO] --- maven-compiler-plugin:2.3.2:testCompile (default-testCompile) @ AJSP ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-surefire-plugin:2.7.2:test (default-test) @ AJSP ---
[INFO] No tests to run.
[INFO] Surefire report directory: /mnt/hda1/AJSP/target/surefire-reports

-------------------------------------------------------
T E S T S
-------------------------------------------------------
There are no tests to run.

Results :

Tests run: 0, Failures: 0, Errors: 0, Skipped: 0

[INFO]
[INFO] --- maven-war-plugin:2.1.1:war (default-war) @ AJSP ---
[INFO] Packaging webapp
[INFO] Assembling webapp [AJSP] in [/mnt/hda1/AJSP/target/AJSP]
[INFO] Processing war project
[INFO] Copying webapp resources [/mnt/hda1/AJSP/src/main/webapp]
[INFO] Webapp assembled in [78 msecs]
[INFO] Building war: /mnt/hda1/AJSP/target/AJSP.war
[INFO] WEB-INF/web.xml already added, skipping
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.804s
[INFO] Finished at: Sun Aug 07 10:00:12 UTC 2011
[INFO] Final Memory: 5M/13M
[INFO] ------------------------------------------------------------------------

檢視 AJSP 專案檔製作後, AJSP 的目錄結構
$ tree .
.
|-- pom.xml
|-- src
|   `-- main
|       |-- java
|       |   `-- foo
|       |       `-- Counter.java
|       |-- resources
|       `-- webapp
|           |-- MyJSP01.jsp
|           |-- WEB-INF
|           |   `-- web.xml
|           `-- index.jsp
`-- target
    |-- AJSP
    |   |-- META-INF
    |   |-- MyJSP01.jsp
    |   |-- WEB-INF
    |   |   |-- classes
    |   |   |   `-- foo
    |   |   |       `-- Counter.class
    |   |   `-- web.xml
    |   `-- index.jsp
    |-- AJSP.war
    |-- classes
    |   `-- foo
    |       `-- Counter.class
    |-- maven-archiver
    |   `-- pom.properties
    `-- surefire

17 directories, 12 files

佈署 AJSP 專案至 Tomcat

$ cp target/AJSP.war /mnt/hda1/apache-tomcat-7.0.19/webapps/

啟動 Tomcat
$ /mnt/hda1/apache-tomcat-7.0.19/bin/startup.sh &
[1] 1321
Using CATALINA_BASE: /mnt/hda1/apache-tomcat-7.0.19
Using CATALINA_HOME: /mnt/hda1/apache-tomcat-7.0.19
Using CATALINA_TMPDIR: /mnt/hda1/apache-tomcat-7.0.19/temp
Using JRE_HOME: /mnt/hda1/jdk1.7.0
Using CLASSPATH: /mnt/hda1/apache-tomcat-7.0.19/bin/bootstrap.jar:/mnt/hda1/apache-tomcat-7.0.19/bin/tomcat-juli.jar

執行 MyJSP01.jsp
$ curl http://localhost:8080/AJSP/MyJSP01.jsp
<html>
<body>
The Page count is :
1
</body>
</html>

Apache Maven 專案管理平台 - WAR 專案建立與執行

1. 初設 AAAWebapp 專案

$ mvn archetype:create -DgroupId=kvm.aaa -DartifactId=AAAWebapp -DarchetypeArtifactId=maven-archetype-webapp
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-archetype-plugin:2.0:create (default-cli) @ standalone-pom ---
[WARNING] This goal is deprecated. Please use mvn archetype:generate instead
[INFO] Defaulting package to group ID: kvm.aaa
Downloading: http://repo1.maven.org/maven2/org/apache/maven/archetypes/maven-archetype-webapp/maven-metadata.xml
Downloaded: http://repo1.maven.org/maven2/org/apache/maven/archetypes/maven-archetype-webapp/maven-metadata.xml (498 B at 0.3 KB/sec)
[INFO] ----------------------------------------------------------------------------
[INFO] Using following parameters for creating project from Old (1.x) Archetype: maven-archetype-webapp:RELEASE
[INFO] ----------------------------------------------------------------------------
[INFO] Parameter: groupId, Value: kvm.aaa
[INFO] Parameter: packageName, Value: kvm.aaa
[INFO] Parameter: package, Value: kvm.aaa
[INFO] Parameter: artifactId, Value: AAAWebapp
[INFO] Parameter: basedir, Value: /mnt/hda1
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] ********************* End of debug info from resources from generated POM ***********************
[INFO] project created from Old (1.x) Archetype in dir: /mnt/hda1/AAAWebapp
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.480s
[INFO] Finished at: Sat Aug 06 18:06:32 UTC 2011
[INFO] Final Memory: 7M/18M
[INFO] ------------------------------------------------------------------------

2. AAAWebapp 專案目錄結構

$ tree AAAWebapp/
AAAWebapp/
|-- pom.xml
`-- src
    `-- main
        |-- resources
        `-- webapp
            |-- WEB-INF
            |   `-- web.xml
            `-- index.jsp

5 directories, 3 files

3. 產生 WAR 專案檔

$ cd AAAWebapp/

$ mvn package
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building AAAWebapp Maven Webapp 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ AAAWebapp ---
[WARNING] Using platform encoding (ANSI_X3.4-1968 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ AAAWebapp ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-resources-plugin:2.4.3:testResources (default-testResources) @ AAAWebapp ---
[WARNING] Using platform encoding (ANSI_X3.4-1968 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /mnt/hda1/AAAWebapp/src/test/resources
[INFO]
[INFO] --- maven-compiler-plugin:2.3.2:testCompile (default-testCompile) @ AAAWebapp ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-surefire-plugin:2.7.2:test (default-test) @ AAAWebapp ---
[INFO] No tests to run.
[INFO] Surefire report directory: /mnt/hda1/AAAWebapp/target/surefire-reports

-------------------------------------------------------
T E S T S
-------------------------------------------------------
There are no tests to run.

Results :

Tests run: 0, Failures: 0, Errors: 0, Skipped: 0

[INFO]
[INFO] --- maven-war-plugin:2.1.1:war (default-war) @ AAAWebapp ---
[INFO] Packaging webapp
[INFO] Assembling webapp [AAAWebapp] in [/mnt/hda1/AAAWebapp/target/AAAWebapp]
[INFO] Processing war project
[INFO] Copying webapp resources [/mnt/hda1/AAAWebapp/src/main/webapp]
[INFO] Webapp assembled in [75 msecs]
[INFO] Building war: /mnt/hda1/AAAWebapp/target/AAAWebapp.war
[INFO] WEB-INF/web.xml already added, skipping
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.140s
[INFO] Finished at: Sat Aug 06 18:12:20 UTC 2011
[INFO] Final Memory: 5M/12M
[INFO] ------------------------------------------------------------------------

4. 佈署 AAAWebapp 專案

$ cp target/AAAWebapp.war /mnt/hda1/apache-tomcat-7.0.19/webapps/

5. 啟動 Tomcat
$ /mnt/hda1/apache-tomcat-7.0.19/bin/startup.sh &
[1] 1321
Using CATALINA_BASE:   /mnt/hda1/apache-tomcat-7.0.19
Using CATALINA_HOME:   /mnt/hda1/apache-tomcat-7.0.19
Using CATALINA_TMPDIR: /mnt/hda1/apache-tomcat-7.0.19/temp
Using JRE_HOME:        /mnt/hda1/jdk1.7.0
Using CLASSPATH:       /mnt/hda1/apache-tomcat-7.0.19/bin/bootstrap.jar:/mnt/hda1/apache-tomcat-7.0.19/bin/tomcat-juli.jar

6. 執行 AAAWebapp 專案

$ curl http://localhost:8080/AAAWebapp/
<html>
<body>
<h2>Hello World!</h2>
</body>
</html>

2011年8月5日星期五

Apache Maven 專案管理平台 - Java 專案建立與執行

初設專案

Maven 專案命令是 mvn, mvn 主命令參數 archetype:generate 會根據 archetypeArtifactId 這參數, 來決定要初設何種專案.

Maven 小組提供一個專案模版網站, 網址 : http://www.mvnbrowser.com/index.html

初設 maven-archetype-quickstart 專案, 命令如下 :

$ mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

Downloaded: http://repo1.maven.org/maven2/org/codehaus/plexus/plexus-interactivity-api/1.0-alpha-5/plexus-interactivity-api-1.0-alpha-5.jar (14 KB at 6.6 KB/sec)
Downloaded: http://repo1.maven.org/maven2/org/apache/maven/shared/maven-invoker/2.0.10/maven-invoker-2.0.10.jar (28 KB at 12.8 KB/sec)
Downloaded: http://repo1.maven.org/maven2/commons-collections/commons-collections/3.2.1/commons-collections-3.2.1.jar (562 KB at 97.0 KB/sec)
[INFO] Generating project in Batch mode
Downloading: http://repo1.maven.org/maven2/org/apache/maven/archetypes/maven-archetype-quickstart/1.0/maven-archetype-quickstart-1.0.jar
Downloaded: http://repo1.maven.org/maven2/org/apache/maven/archetypes/maven-archetype-quickstart/1.0/maven-archetype-quickstart-1.0.jar (5 KB at 7.4 KB/sec)
Downloading: http://repo1.maven.org/maven2/org/apache/maven/archetypes/maven-archetype-quickstart/1.0/maven-archetype-quickstart-1.0.pom
Downloaded: http://repo1.maven.org/maven2/org/apache/maven/archetypes/maven-archetype-quickstart/1.0/maven-archetype-quickstart-1.0.pom (703 B at 1.2 KB/sec)
[INFO] ----------------------------------------------------------------------------
[INFO] Using following parameters for creating project from Old (1.x) Archetype: maven-archetype-quickstart:1.0
[INFO] ----------------------------------------------------------------------------
[INFO] Parameter: groupId, Value: com.mycompany.app
[INFO] Parameter: packageName, Value: com.mycompany.app
[INFO] Parameter: package, Value: com.mycompany.app
[INFO] Parameter: artifactId, Value: my-app
[INFO] Parameter: basedir, Value: /mnt/hda1/apache-maven-3.0.3
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] ********************* End of debug info from resources from generated POM ***********************
[INFO] project created from Old (1.x) Archetype in dir: /mnt/hda1/apache-maven-3.0.3/my-app
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1:35.260s
[INFO] Finished at: Sat Aug 06 09:14:53 UTC 2011
[INFO] Final Memory: 7M/18M
[INFO] ------------------------------------------------------------------------

上述命令, 會下載 archetypeArtifactId 參數所指 maven-archetype-quickstart 專案, 所需的所有檔案 (*.jar, *.pom) 至指定的儲存目錄, 並且會根據 artifactId 參數, 產生 my-app 目錄

檢視儲存目錄內容, 如下 :

drwxr-xr-x 14 root root 4096 Aug 6 09:14 .
drwxr-xr-x 10 root root 4096 Aug 6 07:43 ..
drwxr-xr-x 3 root root 4096 Aug 6 09:14 classworlds
drwxr-xr-x 3 root root 4096 Aug 6 09:14 commons-cli
drwxr-xr-x 3 root root 4096 Aug 6 09:14 commons-collections
drwxr-xr-x 3 root root 4096 Aug 6 09:14 commons-io
drwxr-xr-x 3 root root 4096 Aug 6 09:14 commons-lang
drwxr-xr-x 3 root root 4096 Aug 6 09:14 dom4j
drwxr-xr-x 3 root root 4096 Aug 6 09:14 jdom
drwxr-xr-x 3 root root 4096 Aug 6 09:14 junit
drwxr-xr-x 3 root root 4096 Aug 6 09:14 net
drwxr-xr-x 4 root root 4096 Aug 6 09:13 org
drwxr-xr-x 3 root root 4096 Aug 6 09:14 oro
drwxr-xr-x 3 root root 4096 Aug 6 09:14 xml-apis

my-app 目錄結構, 如下 :

my-app
|-- pom.xml
`-- src
    |-- main
    |   `-- java
    |       `-- com
    |           `-- mycompany
    |               `-- app
    |                   `-- App.java
    `-- test
        `-- java
            `-- com
                `-- mycompany
                    `-- app
                        `-- AppTest.java

在 my-app 目錄中的 pom.xml 設定檔, 是這個專案的核心, 內容如下 :

<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>com.mycompany.app</groupId>
<artifactId>my-app</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>my-app</name>
<url>http://maven.apache.org</url>
<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
</dependencies>
</project>

專案建立

$ cd my-app          # 一定要執行此命令
$ mvn package
            :
            :
xus-io-1.0.pom
Downloaded: http://repo1.maven.org/maven2/org/codehaus/plexus/plexus-io/1.0/plexus-io-1.0.pom (2 KB at 2.1 KB/sec)
Downloading: http://repo1.maven.org/maven2/org/apache/maven/maven-archiver/2.4.1/maven-archiver-2.4.1.jar
Downloading: http://repo1.maven.org/maven2/org/codehaus/plexus/plexus-archiver/1.0/plexus-archiver-1.0.jar
Downloading: http://repo1.maven.org/maven2/org/codehaus/plexus/plexus-io/1.0/plexus-io-1.0.jar
Downloaded: http://repo1.maven.org/maven2/org/apache/maven/maven-archiver/2.4.1/maven-archiver-2.4.1.jar (20 KB at 16.3 KB/sec)
Downloaded: http://repo1.maven.org/maven2/org/codehaus/plexus/plexus-io/1.0/plexus-io-1.0.jar (50 KB at 19.8 KB/sec)
Downloaded: http://repo1.maven.org/maven2/org/codehaus/plexus/plexus-archiver/1.0/plexus-archiver-1.0.jar (174 KB at 46.9 KB/sec)
[INFO] Building jar: /mnt/hda1/my-app/target/my-app-1.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1:20.944s
[INFO] Finished at: Sat Aug 06 10:20:02 UTC 2011
[INFO] Final Memory: 10M/25M
[INFO] ------------------------------------------------------------------------

執行專案

$ java -cp target/my-app-1.0-SNAPSHOT.jar com.mycompany.app.App
Hello World!

參考文章
1. Maven in 5 Minutes
http://maven.apache.org/guides/getting-started/maven-in-five-minutes.html

Apache Maven 專案管理平台 - 安裝

Apache Maven 是一個 Java 的專案管理平台，就好像 C 語言中的 make 與 Java 的 Ant 等專案產生器一樣。

Apache Maven 官方網址 : http://maven.apache.org/

本系列文章的實作, 均使用 TinyCore 這個發行套件, 為使實作順利,
還需事先安裝以下套件 :

$ tce-load -wi tree.tcz # 列出目錄架構
$ tce-load -wi curl.tcz # 文字模式 WWW 瀏覽器

如需更多 TinyCore 操作與設定, 請參考 : http://linuxkvm.blogspot.com/

安裝 Apache Maven

1. 下載 maven

http://maven.apache.org/download.html

2. 解壓縮 apache-maven-3.0.x-bin.zip

3. 設定 M2_HOME 環境變數

Linux Operating Systems

export M2_HOME=/usr/local/apache-maven-3.0.x

Windows 2000/XP

set M2_HOME="c:\program files\apache-maven-3.0.x

4. 設定 PATH 環境變數

Linux Operating Systems

export PATH=$M2_HOME/bin:$PATH

Windows 2000/XP

set PATH="%M2_HOME%\bin";%PATH%

5. 測試

$ mvn -version

Apache Maven 3.0.3 (r1075438; 2011-02-28 17:31:09+0000)

Maven home: /mnt/hda1/apache-maven-3.0.3

Java version: 1.7.0, vendor: Oracle Corporation

Java home: /mnt/hda1/jdk1.7.0/jre

6. 設定下載套件 (*.jar) 的儲存位址

修改 %M2_HOME%\conf\settings.xml 檔案中的 <localRepository>
標籤內容, 內定儲存位址 ${user.home}/.m2

$ nano %M2_HOME%/conf/settings

   <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0

          http://maven.apache.org/xsd/settings-1.0.0.xsd">
    <!-- localRepository
     | The path to the local repository maven will use to store artifacts.
     |
     | Default: ~/.m2/repository  -->
    <localRepository>${env.M2_HOME}\mavenrepo</localRepository>

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Java 憤怒鳥

2011年8月16日星期二

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Java 憤怒鳥

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private final 方法可以被覆蓋 (Override)

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Apache Maven 專案管理平台 - WAR 專案加入 Servlet

Apache Maven 專案管理平台 - WAR 專案加入 JSP

Apache Maven 專案管理平台 - WAR 專案建立與執行

2011年8月5日 星期五

Apache Maven 專案管理平台 - Java 專案建立與執行

Apache Maven 專案管理平台 - 安裝

重要連接

Java 學習筆記本

Ajax 學習筆記本

XML 學習筆記本

Java 網站開發技術

JSP 變形金剛 - JSF

MongoDB 巨量資料庫

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2011年8月16日星期二

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