首先,JRE 和 Server JRE 有些不同:
JRE(Java Runtime Environment,Java运行环境),运行JAVA程序所必须的环境的集合,包含JVM标准实现及Java核心类库。
Server JRE 包含JVM监控工具,以及服务器应用程序常用的工具。但不包括浏览器集成(Java plug-in)
JRE 下载地址:http://www.oracle.com/technetwork/java/archive-139210.html
1. 将压缩包上传到服务器
2. 解压:tar -zxvf server-jre-7u76-linux-x64.tar.gz
3. sudo mkdir /usr/lib/java
4. sudo mv jdk1.7.0_76/ /usr/lib/java/jdk7
5. sudo update-alternatives –install /usr/bin/java java /usr/lib/java/jdk7/jre/bin/java 300
6. java -version
7. 如果需JAVA_HOME环境变量,需修改 /etc/environment 配置文件
JAVA_HOME=”/usr/lib/java/jdk7″
CLASSPATH=”$JAVA_HOME/lib”
PATH=”$JAVA_HOME/bin:”
注: i. /etc/environment 是设置整个系统的环境,而/etc/profile是设置所有用户的环境,前者与登录用户无关,后者与登录用户有关 ii. 修改 /etc/environment 需要重新登录
8. 如果系统中有多个jre,执行sudo update-alternatives –config java,然后根据提示选择
——
和任何人保持安全距离,这种人与人之间随时会失去的不安全感才会促使你真正成长。
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