方法一：手动解压JDK的压缩包，然后设置环境变量
1.在/usr/目录下创建java目录
[root@localhost~]#mkdir/usr/java [root@localhost~]#cd/usr/java
2.下载jdk,然后解压
[root@localhostjava]#curl-Ohttp://download.Oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz[root@localhostjava]#tar-zxvfjdk-7u79-linux-x64.tar.gz
3.设置环境变量
[root@localhostjava]#vi/etc/profile
在profile中添加如下内容:
#setjavaenvironment JAVA_HOME=/usr/java/jdk1.7.0_79 JRE_HOME=/usr/java/jdk1.7.0_79/jre CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin exportJAVA_HOMEJRE_HOMECLASS_PATHPATH
让修改生效:
[root@localhostjava]#source/etc/profile
4.验证JDK有效性
[root@localhostjava]#java-version javaversion"1.7.0_79"Java(TM)SERuntimeEnvironment(build1.7.0_79-b15) JavaHotSpot(TM)64-BitServerVM(build24.79-b02,mixedmode)
方法二：用yum安装JDK
1.查看yum库中都有哪些jdk版本(暂时只发现了openjdk)
[root@localhost~]#yumsearchjava|grepjdk ldapjdk-javadoc.x86_64:Javadocforldapjdk java-1.6.0-openjdk.x86_64:OpenJDKRuntimeEnvironment java-1.6.0-openjdk-demo.x86_64:OpenJDKDemos java-1.6.0-openjdk-devel.x86_64:OpenJDKDevelopmentEnvironment java-1.6.0-openjdk-javadoc.x86_64:OpenJDKAPIDocumentation java-1.6.0-openjdk-src.x86_64:OpenJDKSourceBundle java-1.7.0-openjdk.x86_64:OpenJDKRuntimeEnvironment java-1.7.0-openjdk-demo.x86_64:OpenJDKDemos java-1.7.0-openjdk-devel.x86_64:OpenJDKDevelopmentEnvironment java-1.7.0-openjdk-javadoc.noarch:OpenJDKAPIDocumentation java-1.7.0-openjdk-src.x86_64:OpenJDKSourceBundle java-1.8.0-openjdk.x86_64:OpenJDKRuntimeEnvironment java-1.8.0-openjdk-demo.x86_64:OpenJDKDemos java-1.8.0-openjdk-devel.x86_64:OpenJDKDevelopmentEnvironment java-1.8.0-openjdk-headless.x86_64:OpenJDKRuntimeEnvironment java-1.8.0-openjdk-javadoc.noarch:OpenJDKAPIDocumentation java-1.8.0-openjdk-src.x86_64:OpenJDKSourceBundle ldapjdk.x86_64:TheMozillaLDAPJavaSDK
2.选择版本,进行安装
//选择1.7版本进行安装
[root@localhost~]#yuminstalljava-1.7.0-openjdk
//安装完之后，默认的安装目录是在: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64
3.设置环境变量
[root@localhost~]#vi/etc/profile
在profile文件中添加如下内容
#setjavaenvironment JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64 JRE_HOME=$JAVA_HOME/jre CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin exportJAVA_HOMEJRE_HOMECLASS_PATHPATH
让修改生效
[root@localhostjava]#source/etc/profile
4.验证(同上一方法)
方法三：用rpm安装JDK
1.下载rpm安装文件
[root@localhost~]$curl-Ohttp://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.rpm
2.使用rpm命令安装
[root@localhost~]#rpm-ivhjdk-7u79-linux-x64.rpm
3.设置环境变量
[root@localhostjava]#vi/etc/profile
在打开的profile文件中添加如下内容
#setjavaenvironment JAVA_HOME=/usr/java/jdk1.7.0_79 JRE_HOME=/usr/java/jdk1.7.0_79/jre CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin exportJAVA_HOMEJRE_HOMECLASS_PATHPATH
让修改生效
[root@localhostjava]#source/etc/profile
4.验证(同上一方法)
注:和yum安装类似，不用设置环境变量就可以运行java命令。rpm安装方式默认会把jdk安装到/usr/java/jdk1.7.0_79，然后通过三层链接，链接到/usr/bin,具体链接如下：
[root@localhost~]#cd/bin [root@localhostbin]#ll|grepjava lrwxrwxrwx.1rootroot25Mar2811:24jar->/usr/java/default/bin/jar lrwxrwxrwx.1rootroot26Mar2811:24java->/usr/java/default/bin/java lrwxrwxrwx.1rootroot27Mar2811:24javac->/usr/java/default/bin/javac lrwxrwxrwx.1rootroot29Mar2811:24javadoc->/usr/java/default/bin/javadoc lrwxrwxrwx.1rootroot28Mar2811:24javaws->/usr/java/default/bin/javaws lrwxrwxrwx.1rootroot30Mar2811:24jcontrol->/usr/java/default/bin/jcontrol [root@localhostbin]#cd/usr/java/[root@localhostjava]#ll total4lrwxrwxrwx.1rootroot16Mar2811:24default->/usr/java/latest drwxr-xr-x.8rootroot4096Mar2811:24jdk1.7.0_79 lrwxrwxrwx.1rootroot21Mar2811:24latest->/usr/java/jdk1.7.0_7
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