详解ubuntu搭建Java开发环境
<p>没有用Java写过程序，做为一个Java新手，在写第一个Hello，world程序之前，先在Ubuntu中搭建Java开发环境。<br>
本文结构：</p>
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一、JDK安装</li>
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二、MyEclipse安装</li>
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三、Hello World测试</li>
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<p>
<strong>一、JDK安装</strong><br>
好吧，我选择JDK1.6，是不是有点out了？<br>
１、下载JDK1.6,你可以到官网去下载，下载时请看清自己的系统版本，记得一定要下载相应的版本。<br>
２、将下载的文件放置到/usr/lib/java目录下(需要手动创建java目录)，并修改文件的可执行权限，如chmod 777 jdk-6u41-linux-x64.bin<br>
【PS：如果提示已经存在有文件java，无法创建java，可以给目录取名为java1.6(表示这是jdk 1.6版本)】<br>
３、安装文件，<span><strong>sudo ./jdk-6u41-linux-x64.bin</strong></span><br>
４、安装完毕后，则需配置系统环境 <span><strong>sudo vi /etc/environment</strong></span>，或配置用户环境变量<strong><span>vi /home/username/.bashrc</span></strong>，建立JAVAHOME, CLASSPATH, 修改PATH变量<br>
如我的设置为：</p>
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<code class="bash plain">JAVA_HOME=”</code><code class="bash plain">/usr/lib/java1</code><code class="bash plain">.6</code><code class="bash plain">/jdk1</code><code class="bash plain">.6.0_41″</code>
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<code class="bash plain">PATH=”</code><code class="bash plain">/usr/local/sbin</code><code class="bash plain">:</code><code class="bash plain">/usr/local/bin</code><code class="bash plain">:</code><code class="bash plain">/usr/sbin</code><code class="bash plain">:</code><code class="bash plain">/usr/bin</code><code class="bash plain">:</code><code class="bash plain">/sbin</code><code class="bash plain">:</code><code class="bash plain">/bin</code><code class="bash plain">:</code><code class="bash plain">/usr/games</code><code class="bash plain">:</code><code class="bash plain">/usr/lib/java1</code><code class="bash plain">.6</code><code class="bash plain">/jdk1</code><code class="bash plain">.6.0_41</code><code class="bash plain">/bin</code><code class="bash plain">:</code><code class="bash plain">/usr/lib/java1</code><code class="bash plain">.6</code><code class="bash plain">/jdk1</code><code class="bash plain">.6.0_41</code><code class="bash plain">/jre/bin</code><code class="bash plain">”</code>
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<code class="bash plain">CLASSPATH=”</code><code class="bash plain">/usr/lib/java1</code><code class="bash plain">.6</code><code class="bash plain">/jdk1</code><code class="bash plain">.6.0_41</code><code class="bash plain">/lib</code><code class="bash plain">:</code><code class="bash plain">/usr/lib/java1</code><code class="bash plain">.6</code><code class="bash plain">/jdk1</code><code class="bash plain">.6.0_41</code><code class="bash plain">/jre/lib</code><code class="bash plain">”</code>
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５、执行命令，使配置生效。source /etc/environment ( source /home/username/.bashrc )<br>
６、验证是否安装完毕，使用java -version或者直接使用javac，看其生效与否。<br>
７、如果还未生效，很有可能由于ubuntu中已有默认的jdk，如openjdk，所以，为了使默认使用的是我们安装的jdk，还要进行如下工作。</p>
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<code class="bash functions">sudo</code> <code class="bash plain">update-alternatives –</code><code class="bash functions">install</code> <code class="bash plain">/usr/bin/java</code> <code class="bash plain">java </code><code class="bash plain">/usr/lib/java/jdk1</code><code class="bash plain">.6.0_41</code><code class="bash plain">/bin/java</code> <code class="bash plain">300</code>
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<code class="bash functions">sudo</code> <code class="bash plain">update-alternatives –</code><code class="bash functions">install</code> <code class="bash plain">/usr/bin/javac</code> <code class="bash plain">javac </code><code class="bash plain">/usr/lib/java/jdk1</code><code class="bash plain">.6.0_41</code><code class="bash plain">/bin/javac</code> <code class="bash plain">300</code>
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通过这一步将我们安装的jdk加入java选单。<br>
然后执行：<br><span><strong>update-alternatives –config java</strong></span><br><strong>二、MyEclipse安装</strong><br>
安装包下载,下载完成后，修改权限直接执行便可安装。<br><strong>三、第一个Hello world程序</strong></p>
<p>
1）新建一个java project，取名HelloWorld<br>
2）在新建一个包，包名取为com.cricode<br>
3）在包com.cricode中新建一个类SayHello，内容如下：</p>
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<code class="java keyword">package</code> <code class="java plain">com.cricode;</code>
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<code class="java spaces"> </code>
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<code class="java keyword">public</code> <code class="java keyword">class</code> <code class="java plain">SayHello {</code>
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<code class="java spaces"> </code><code class="java keyword">public</code> <code class="java keyword">static</code> <code class="java keyword">void</code> <code class="java plain">main(String[] args){</code>
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<code class="java spaces"> </code><code class="java plain">System.out.println(</code><code class="java string">"Hello,world"</code><code class="java plain">);</code>
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<code class="java spaces"> </code><code class="java plain">}</code>
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<code class="java plain">}</code>
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运行结果：Hello,world</p>
<p>
至此，Linux上Java开发环境安装完毕，希望大家喜欢。</p>
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