linux 上使用yum 安装openjdk1.8
使用yum查找jdk: yum search java|grep jdk
# yum search java|grep jdk
ldapjdk-javadoc.noarch : Javadoc for ldapjdk
java-1.6.-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.6.-openjdk-demo.x86_64 : OpenJDK Demos
java-1.6.-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.6.-openjdk-javadoc.x86_64 : OpenJDK API Documentation
java-1.6.-openjdk-src.x86_64 : OpenJDK Source Bundle
java-1.7.-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.7.-openjdk-accessibility.x86_64 : OpenJDK accessibility connector
java-1.7.-openjdk-demo.x86_64 : OpenJDK Demos
java-1.7.-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.7.-openjdk-headless.x86_64 : The OpenJDK runtime environment without
java-1.7.-openjdk-javadoc.noarch : OpenJDK API Documentation
java-1.7.-openjdk-src.x86_64 : OpenJDK Source Bundle
java-1.8.-openjdk.i686 : OpenJDK Runtime Environment
java-1.8.-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.8.-openjdk-accessibility.i686 : OpenJDK accessibility connector
java-1.8.-openjdk-accessibility.x86_64 : OpenJDK accessibility connector
java-1.8.-openjdk-accessibility-debug.i686 : OpenJDK accessibility connector
java-1.8.-openjdk-accessibility-debug.x86_64 : OpenJDK accessibility connector
java-1.8.-openjdk-debug.i686 : OpenJDK Runtime Environment with full debug on
java-1.8.-openjdk-debug.x86_64 : OpenJDK Runtime Environment with full debug on
java-1.8.-openjdk-demo.i686 : OpenJDK Demos
java-1.8.-openjdk-demo.x86_64 : OpenJDK Demos
java-1.8.-openjdk-demo-debug.i686 : OpenJDK Demos with full debug on
java-1.8.-openjdk-demo-debug.x86_64 : OpenJDK Demos with full debug on
java-1.8.-openjdk-devel.i686 : OpenJDK Development Environment
java-1.8.-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.8.-openjdk-devel-debug.i686 : OpenJDK Development Environment with full
java-1.8.-openjdk-devel-debug.x86_64 : OpenJDK Development Environment with
java-1.8.-openjdk-headless.i686 : OpenJDK Runtime Environment
java-1.8.-openjdk-headless.x86_64 : OpenJDK Runtime Environment
java-1.8.-openjdk-headless-debug.i686 : OpenJDK Runtime Environment with full
java-1.8.-openjdk-headless-debug.x86_64 : OpenJDK Runtime Environment with full
java-1.8.-openjdk-javadoc.noarch : OpenJDK API Documentation
java-1.8.-openjdk-javadoc-debug.noarch : OpenJDK API Documentation for packages
java-1.8.-openjdk-javadoc-zip.noarch : OpenJDK API Documentation compressed in
java-1.8.-openjdk-javadoc-zip-debug.noarch : OpenJDK API Documentation
java-1.8.-openjdk-src.i686 : OpenJDK Source Bundle
java-1.8.-openjdk-src.x86_64 : OpenJDK Source Bundle
java-1.8.-openjdk-src-debug.i686 : OpenJDK Source Bundle for packages with
java-1.8.-openjdk-src-debug.x86_64 : OpenJDK Source Bundle for packages with
java--openjdk.i686 : OpenJDK Runtime Environment
java--openjdk.x86_64 : OpenJDK Runtime Environment
java--openjdk-debug.i686 : OpenJDK Runtime Environment with full debug on
java--openjdk-debug.x86_64 : OpenJDK Runtime Environment with full debug on
java--openjdk-demo.i686 : OpenJDK Demos
java--openjdk-demo.x86_64 : OpenJDK Demos
java--openjdk-demo-debug.i686 : OpenJDK Demos with full debug on
java--openjdk-demo-debug.x86_64 : OpenJDK Demos with full debug on
java--openjdk-devel.i686 : OpenJDK Development Environment
java--openjdk-devel.x86_64 : OpenJDK Development Environment
java--openjdk-devel-debug.i686 : OpenJDK Development Environment with full
java--openjdk-devel-debug.x86_64 : OpenJDK Development Environment with
java--openjdk-headless.i686 : OpenJDK Headless Runtime Environment
java--openjdk-headless.x86_64 : OpenJDK Headless Runtime Environment
java--openjdk-headless-debug.i686 : OpenJDK Runtime Environment with full
java--openjdk-headless-debug.x86_64 : OpenJDK Runtime Environment with full
java--openjdk-javadoc.i686 : OpenJDK API documentation
java--openjdk-javadoc.x86_64 : OpenJDK API documentation
java--openjdk-javadoc-debug.i686 : OpenJDK API documentation for packages
java--openjdk-javadoc-debug.x86_64 : OpenJDK API documentation for packages
java--openjdk-javadoc-zip.i686 : OpenJDK API documentation compressed in
java--openjdk-javadoc-zip.x86_64 : OpenJDK API documentation compressed in
java--openjdk-javadoc-zip-debug.i686 : OpenJDK API documentation compressed
java--openjdk-javadoc-zip-debug.x86_64 : OpenJDK API documentation
java--openjdk-jmods.i686 : JMods for OpenJDK
java--openjdk-jmods.x86_64 : JMods for OpenJDK
java--openjdk-jmods-debug.i686 : JMods for OpenJDK with full debug on
java--openjdk-jmods-debug.x86_64 : JMods for OpenJDK with full debug on
java--openjdk-src.i686 : OpenJDK Source Bundle
java--openjdk-src.x86_64 : OpenJDK Source Bundle
java--openjdk-src-debug.i686 : OpenJDK Source Bundle for packages with debug
java--openjdk-src-debug.x86_64 : OpenJDK Source Bundle for packages with
ldapjdk.noarch : The Mozilla LDAP Java SDK执行安装命令：yum install java-1.8.0-openjdk
安装成功后，默认安装路径在/usr/lib/jvm/下边，
如/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.144-0.b01.el6_9.x86_64查看安装路径(如下所示)：
which java
ls -lrt /usr/bin/java[root@preproduct1 ~]# which java
/usr/bin/java
[root@preproduct1 ~]# echo $JAVA_HOME
/usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64
[root@preproduct1 ~]# ls -lrt /usr/bin/java
lrwxrwxrwx root root Feb : /usr/bin/java -> /etc/alternatives/java
[root@preproduct1 ~]# ls -lrt /etc/alternatives/java
lrwxrwxrwx root root Feb : /etc/alternatives/java -> /usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64/jre/bin/java
[root@preproduct1 ~]# cd /usr/lib/jvm
[root@preproduct1 /usr/lib/jvm]# ll
total
lrwxrwxrwx root root Feb : java -> /etc/alternatives/java_sdk
lrwxrwxrwx root root Feb : java-1.8. -> /etc/alternatives/java_sdk_1.8.0
lrwxrwxrwx root root Feb : java-1.8.-openjdk -> /etc/alternatives/java_sdk_1..0_openjdk
drwxr-xr-x root root Feb : java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64
lrwxrwxrwx root root Feb : java-openjdk -> /etc/alternatives/java_sdk_openjdk
lrwxrwxrwx root root Feb : jre -> /etc/alternatives/jre
lrwxrwxrwx root root Feb : jre-1.8. -> /etc/alternatives/jre_1.8.0
lrwxrwxrwx root root Feb : jre-1.8.-openjdk -> /etc/alternatives/jre_1..0_openjdk
lrwxrwxrwx root root Feb : jre-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64 -> java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64/jre
lrwxrwxrwx root root Feb : jre-openjdk -> /etc/alternatives/jre_openjdk验证java是否安装成功
查看java版本：java -version
# java -version
openjdk version "1.8.0_191"
OpenJDK Runtime Environment (build 1.8.0_191-b12)
OpenJDK -Bit Server VM (build 25.191-b12, mixed mode)查看java是否可用：javac
# javac
-bash: javac: command not found错误原因：默认安装完只有运行环境，java安装目录下只有jre文件夹
安装开发环境yum install java-1.8.0-openjdk-devel.x86_64
安装完可看到java安装目录下出现bin、lib等文件夹:[root@preproduct1 /usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64]# l
total
drwxr-xr-x root root Feb : bin
drwxr-xr-x root root Feb : include
drwxr-xr-x root root Feb : jre
drwxr-xr-x root root Feb : lib
drwxr-xr-x root root Feb : tapset再次输入javac说明安装成功
# javac
Usage: javac <options> <source files>
where possible options include:
-g Generate all debugging info
-g:none Generate no debugging info
-g:{lines,vars,source} Generate only some debugging info
-nowarn Generate no warnings
-verbose Output messages about what the compiler is doing
-deprecation Output source locations where deprecated APIs are use
-classpath <path> Specify where to find user class files and annotationocessors
-cp <path> Specify where to find user class files and annotationocessors
-sourcepath <path> Specify where to find input source files
-bootclasspath <path> Override location of bootstrap class files
-extdirs <dirs> Override location of installed extensions
-endorseddirs <dirs> Override location of endorsed standards path
-proc:{none,only} Control whether annotation processing and/or compilat is done.
-processor <class1>[,<class2>,<class3>...] Names of the annotation processors ton; bypasses default discovery process
-processorpath <path> Specify where to find annotation processors
-parameters Generate metadata for reflection on method parameters
-d <directory> Specify where to place generated class files
-s <directory> Specify where to place generated source files
-h <directory> Specify where to place generated native header files
-implicit:{none,class} Specify whether or not to generate class files for imcitly referenced files
-encoding <encoding> Specify character encoding used by source files
-source <release> Provide source compatibility with specified release
-target <release> Generate class files for specific VM version
-profile <profile> Check that API used is available in the specified proe
-version Version information
-help Print a synopsis of standard options
-Akey[=value] Options to pass to annotation processors
-X Print a synopsis of nonstandard options
-J<flag> Pass <flag> directly to the runtime system
-Werror Terminate compilation if warnings occur
@<filename> Read options and filenames from file设置环境变量
修改/etc/profile文件：vi /etc/profile
在profile文件末尾新增如下内容：#set java environment
JAVA_HOME=/usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.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
export JAVA_HOME JRE_HOME CLASS_PATH PATH使环境变量生效：source /etc/profile
[root@preproduct1 /usr/lib/jvm]# cd /usr/lib/jvm
[root@preproduct1 /usr/lib/jvm]# cd java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64/
[root@preproduct1 /usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64]# source /etc/profile
[root@preproduct1 /usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64]# echo $JAVA_HOME
/usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64
至此jdk安装成功
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