Linux下配置jdk1.7

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1. 下载jdk-7u21-linux-i586.tar.gz

URL：http://pan.baidu.com/share/link?shareid=859305742&uk=17696248&fid=4091154440

2.解压安装

sudo tar zxvf ./jdk-7u21-linux-i586.tar.gz -C /usr/lib/jvm

3.修改环境变量

vi ~/.bashrc

添加如下内容：

export JAVA_HOME=/usr/lib/jvm/jdk1.7.0_21/
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

使其生效 source ~/.bashrc

4.配置默认jdk版本

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_21/bin/java 300

sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0_21/bin/javac 300

执行代码

sudo update-alternatives --config java

输出内容：

共有 3 个程序提供“java”。

选择命令
-----------------------------------------------
* 1 /usr/lib/jvm/jre-1.6.0-openjdk/bin/java
2 /usr/lib/jvm/jre-1.5.0-gcj/bin/java
+ 3 /usr/lib/jvm/jdk1.7.0_21/bin/java

输入：3

5.测试

[xxx@localhost package]$ java -version
java version "1.7.0_21"
Java(TM) SE Runtime Environment (build 1.7.0_21-b11)
Java HotSpot(TM) Client VM (build 23.21-b01, mixed mode)

测试java代码

[xxx@localhost ~]$ cat HelloWorldApp.java
public class HelloWorldApp
{

public static void main (String args[ ])
{

System.out.println("Hello World!");

}

}

[xxx@localhost ~]$ javac HelloWorldApp.java
[xxx@localhost ~]$ java HelloWorldApp
Hello World!

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