【背景】
折腾：
中，需要先去安装Java。
【折腾过程】
1.参考：
Install OpenFire 3.8.1 on CentOS 6.4 x86_64 – The Official Blog of Richard Ricketts
去操作：
[root@bogon ~]# yum search java Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * atomic: mirrors.hosting.in.th * base: mirrors.163.com * extras: mirrors.btte.net * updates: mirrors.163.com ======================================================== N/S Matched: java ========================================================= adaptx-javadoc.x86_64 : Javadoc for adaptx ant-contrib-javadoc.noarch : Javadoc for ant-contrib ant-javadoc.x86_64 : Javadoc for ant ant-javamail.x86_64 : Optional javamail tasks for ant antlr-javadoc.x86_64 : Javadoc for antlr apache-jasper-javadoc.noarch : Javadoc for Jasper avalon-framework-javadoc.x86_64 : Javadoc for avalon-framework avalon-logkit-javadoc.noarch : Javadoc for avalon-logkit axis-javadoc.noarch : Javadoc for axis batik-javadoc.noarch : Javadoc for batik bcel-javadoc.x86_64 : Javadoc for bcel bea-stax-javadoc.x86_64 : Javadoc for bea-stax brlapi-java.x86_64 : Java binding for BrlAPI bsf-javadoc.noarch : Javadoc for bsf bsh-javadoc.noarch : Javadoc for bsh castor-javadoc.x86_64 : Javadoc for castor classpathx-jaf-javadoc.x86_64 : Javadoc for classpathx-jaf classpathx-mail-javadoc.noarch : Javadoc for classpathx-mail db4-java.x86_64 : Development files for using the Berkeley DB (version 4) with Java eclipse-mylyn-java.x86_64 : Mylyn Bridge: Java Development flute-javadoc.noarch : Javadoc for flute fop-javadoc.x86_64 : Javadoc for fop gcc-java.x86_64 : Java support for GCC graphviz-java.x86_64 : Java extension for graphviz hamcrest-javadoc.noarch : Javadoc for hamcrest hsqldb-javadoc.noarch : Javadoc for hsqldb icu4j-javadoc.x86_64 : Javadoc for icu4j jakarta-commons-beanutils-javadoc.x86_64 : Javadoc for jakarta-commons-beanutils jakarta-commons-codec-javadoc.x86_64 : Javadoc for jakarta-commons-codec jakarta-commons-collections-javadoc.noarch : Javadoc for jakarta-commons-collections jakarta-commons-collections-testframework-javadoc.noarch : Javadoc for jakarta-commons-collections-testframework jakarta-commons-daemon-javadoc.x86_64 : Javadoc for jakarta-commons-daemon jakarta-commons-dbcp-javadoc.noarch : Javadoc for jakarta-commons-dbcp jakarta-commons-digester-javadoc.noarch : Javadoc for jakarta-commons-digester jakarta-commons-discovery-javadoc.noarch : Javadoc for jakarta-commons-discovery jakarta-commons-el-javadoc.noarch : Javadoc for jakarta-commons-el jakarta-commons-httpclient-javadoc.x86_64 : Javadoc for jakarta-commons-httpclient jakarta-commons-io-javadoc.noarch : Javadoc for jakarta-commons-io jakarta-commons-lang-javadoc.noarch : Javadoc for jakarta-commons-lang jakarta-commons-logging-javadoc.noarch : Javadoc for jakarta-commons-logging jakarta-commons-net-javadoc.noarch : Javadoc for jakarta-commons-net jakarta-commons-pool-javadoc.x86_64 : Javadoc for jakarta-commons-pool jakarta-oro-javadoc.x86_64 : Javadoc for jakarta-oro jakarta-taglibs-standard-javadoc.noarch : Javadoc for jakarta-taglibs-standard java_cup.x86_64 : Java source interpreter java_cup-javadoc.x86_64 : Javadoc for java_cup java_cup-manual.x86_64 : Documentation for java_cup javacc.x86_64 : A parser/scanner generator for java javacc-demo.x86_64 : Examples for javacc javacc-manual.x86_64 : Manual for javacc javassist.noarch : The Java Programming Assistant provides simple Java bytecode manipulation javassist-javadoc.noarch : Javadocs for javassist jcommon-serializer-javadoc.noarch : Javadoc for jcommon-serializer jdepend-javadoc.noarch : Javadoc for jdepend jdom-javadoc.noarch : Javadoc for jdom jflex-javadoc.noarch : Javadoc for jflex jlex-javadoc.x86_64 : Javadoc for jlex jna-javadoc.x86_64 : Javadocs for jna jsch-javadoc.noarch : Javadoc for jsch jss-javadoc.x86_64 : Java Security Services (JSS) Javadocs jtidy-javadoc.noarch : Javadoc for jtidy junit-javadoc.x86_64 : Javadoc for junit junit4-javadoc.noarch : Javadoc for junit4 jython-javadoc.x86_64 : Javadoc for jython jzlib-javadoc.x86_64 : Javadoc for jzlib ldapjdk-javadoc.x86_64 : Javadoc for ldapjdk libbase-javadoc.noarch : Javadoc for libbase libfonts-javadoc.noarch : Javadoc for libfonts libformula-javadoc.noarch : Javadoc for libformula libguestfs-java.x86_64 : Java bindings for libguestfs libguestfs-java-devel.x86_64 : Java development package for libguestfs libguestfs-javadoc.x86_64 : Java documentation for libguestfs liblayout-javadoc.noarch : Javadoc for liblayout libloader-javadoc.noarch : Javadoc for libloader libreadline-java.x86_64 : Java wrapper for the EditLine library libreadline-java-javadoc.x86_64 : Javadoc for libreadline-java libreoffice-javafilter.x86_64 : Optional javafilter module for LibreOffice librepository-javadoc.noarch : Javadoc for librepository libvirt-java.noarch : Java bindings for the libvirt virtualization API libvirt-java-devel.noarch : Compressed Java source files for libvirt-java libvirt-java-javadoc.noarch : Java documentation for libvirt-java log4j-javadoc.x86_64 : Javadoc for log4j lpg-java.noarch : Java runtime library for LPG lpg-java-compat.noarch : Compatibility Java runtime library for LPG 1.x lucene-javadoc.noarch : Javadoc for Lucene mx4j-javadoc.noarch : Javadoc for mx4j objectweb-anttask-javadoc.noarch : Javadoc for objectweb-anttask objectweb-asm-javadoc.noarch : Javadoc for objectweb-asm pentaho-libxml-javadoc.noarch : Javadoc for pentaho-libxml pentaho-reporting-flow-engine-javadoc.noarch : Javadoc for pentaho-reporting-flow-engine pki-common-javadoc.noarch : Certificate System - PKI Common Framework Javadocs pki-java-tools.noarch : Certificate System - PKI Java-Based Tools pki-java-tools-javadoc.noarch : Certificate System - PKI Java-Based Tools Javadocs pki-util-javadoc.noarch : Certificate System - PKI Utility Framework Javadocs ppl-java.x86_64 : The Java interface of the Parma Polyhedra Library ppl-java-javadoc.x86_64 : Javadocs for ppl-java qdox-javadoc.noarch : Javadoc for qdox regexp-javadoc.x86_64 : Javadoc for regexp rhino-javadoc.noarch : Javadoc for rhino rome-javadoc.noarch : Javadocs for rome sac-javadoc.noarch : Javadoc for sac saxon-javadoc.noarch : Javadoc for saxon sblim-cim-client-javadoc.noarch : Javadoc for sblim-cim-client sblim-cim-client2-javadoc.noarch : Javadoc for sblim-cim-client2 setools-libs-java.i686 : Java bindings for SELinux policy analysis setools-libs-java.x86_64 : Java bindings for SELinux policy analysis slf4j-javadoc.noarch : Javadoc for slf4j svnkit-javadoc.x86_64 : Javadoc for SVNKit tagsoup-javadoc.noarch : Javadoc for tagsoup tomcat6-javadoc.x86_64 : Javadoc generated documentation for Apache Tomcat trilead-ssh2-javadoc.noarch : Javadoc for trilead-ssh2 tzdata-java.noarch : Timezone data for Java velocity-javadoc.noarch : Javadoc for velocity werken-xpath-javadoc.noarch : Javadoc for werken-xpath ws-commons-util-javadoc.noarch : Javadoc for ws-commons-util ws-jaxme-javadoc.noarch : Javadoc for ws-jaxme wsdl4j-javadoc.noarch : Javadoc for wsdl4j xalan-j2-javadoc.noarch : Javadoc for xalan-j2 xdoclet-javadoc.noarch : XDoclet Javadoc xerces-j2-javadoc-apis.x86_64 : Javadoc for xerces-j2 apis xerces-j2-javadoc-impl.x86_64 : Javadoc for xerces-j2 implementation xerces-j2-javadoc-other.x86_64 : Javadoc for other xerces-j2 components xerces-j2-javadoc-xni.x86_64 : Javadoc for xerces-j2 xni xjavadoc.noarch : The XJavaDoc engine xjavadoc-javadoc.noarch : Javadoc for xjavadoc xml-commons-apis-javadoc.x86_64 : Javadoc for xml-commons-apis xml-commons-resolver-javadoc.x86_64 : Javadoc for xml-commons-resolver xmldb-api-javadoc.noarch : Javadoc for xmldb-api xmlgraphics-commons-javadoc.noarch : Javadoc for xmlgraphics-commons xmlrpc3-javadoc.noarch : Javadoc for xmlrpc3 zabbix-java-gateway.x86_64 : Zabbix java gateway ant.x86_64 : Ant build tool for java avalon-framework.x86_64 : Java components interfaces avalon-logkit.noarch : Java logging toolkit axis.noarch : A SOAP implementation in Java batik.x86_64 : Scalable Vector Graphics for Java bsh.noarch : Lightweight Scripting for Java byaccj.x86_64 : Parser Generator with Java Extension castor.x86_64 : An open source data binding framework for Java classpathx-jaf.x86_64 : GNU JavaBeans(tm) Activation Framework classpathx-mail.noarch : GNU JavaMail(tm) ecj.x86_64 : Eclipse Compiler for Java eclipse-jdt.x86_64 : Eclipse Java Development Tools flute.x86_64 : Java CSS parser using SAC gcc.x86_64 : Various compilers (C, C++, Objective-C, Java, ...) gdb.x86_64 : A GNU source-level debugger for C, C++, Java and other languages icedtea-web.x86_64 : Additional Java components for OpenJDK - Java browser plug-in and Web Start implementation icedtea-web-javadoc.noarch : API documentation for IcedTea-Web icu4j.x86_64 : International Components for Unicode for Java jakarta-commons-collections.noarch : Provides new interfaces, implementations and utilities for Java Collections jakarta-commons-daemon-jsvc.x86_64 : Java daemon launcher jakarta-commons-lang.noarch : Provides a host of helper utilities for the java.lang API jakarta-commons-net.noarch : Internet protocol suite Java library java-1.5.0-gcj.x86_64 : JPackage runtime compatibility layer for GCJ java-1.5.0-gcj-devel.x86_64 : JPackage development compatibility layer for GCJ java-1.5.0-gcj-javadoc.x86_64 : API documentation for libgcj java-1.5.0-gcj-src.x86_64 : Source files for libgcj java-1.6.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.6.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.6.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.6.0-openjdk-javadoc.x86_64 : OpenJDK API Documentation java-1.6.0-openjdk-src.x86_64 : OpenJDK Source Bundle java-1.7.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.7.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.7.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.7.0-openjdk-javadoc.noarch : OpenJDK API Documentation java-1.7.0-openjdk-src.x86_64 : OpenJDK Source Bundle java-1.8.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.8.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.8.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.8.0-openjdk-headless.x86_64 : OpenJDK Runtime Environment java-1.8.0-openjdk-javadoc.noarch : OpenJDK API Documentation java-1.8.0-openjdk-src.x86_64 : OpenJDK Source Bundle jcommon-serializer.x86_64 : JFree Java General Serialization Framework jdepend.noarch : Java Design Quality Metrics jdom.noarch : Java alternative to DOM and SAX jlex.x86_64 : A Lexical Analyzer Generator for Java jline.noarch : Java library for reading and editing user input in console applications jna.x86_64 : Pure Java access to native libraries jsch.noarch : Pure Java implementation of SSH2 jss.x86_64 : Java Security Services (JSS) junit.x86_64 : Java regression test package junit4.noarch : Java regression test package jython.x86_64 : A Java implementation of the Python language jzlib.x86_64 : JZlib re-implementation of zlib in pure Java ldapjdk.x86_64 : The Mozilla LDAP Java SDK libgcj.i686 : Java runtime library for gcc libgcj.x86_64 : Java runtime library for gcc libgcj-devel.i686 : Libraries for Java development using GCC libgcj-devel.x86_64 : Libraries for Java development using GCC libgcj-src.x86_64 : Java library sources from GCC4 preview libreoffice-rhino.x86_64 : JavaScript support for LibreOffice log4j.x86_64 : Java logging package mx4j.noarch : Open source implementation of JMX Java API mysql-connector-java.noarch : Official JDBC driver for MySQL nuxwdog-client-java.x86_64 : Nuxwdog Watchdog client JNI Package oprofile-jit.i686 : Libraries required for profiling Java and other JITed code oprofile-jit.x86_64 : Libraries required for profiling Java and other JITed code perl-JSON.noarch : Parse and convert to JSON (JavaScript Object Notation) pl-jpl.x86_64 : A bidirectional Prolog/Java interface for SWI Prolog rhino.noarch : JavaScript for Java sac.x86_64 : Java standard interface for CSS parser sat4j.noarch : A library of SAT solvers written in Java saxon.noarch : Java XSLT processor saxon-aelfred.noarch : Java XML parser sblim-cim-client.noarch : Java CIM Client library sblim-cim-client2.noarch : Java CIM Client library sinjdoc.x86_64 : Documentation generator for Java source code slf4j.noarch : Simple Logging Facade for Java subversion-javahl.i686 : JNI bindings to the Subversion libraries subversion-javahl.x86_64 : JNI bindings to the Subversion libraries svnkit.x86_64 : Pure Java Subversion client library tagsoup.noarch : A SAX-compliant HTML parser written in Java tigervnc-server-applet.noarch : Java TigerVNC viewer applet for TigerVNC server trilead-ssh2.noarch : SSH-2 protocol implementation in pure Java v8.x86_64 : JavaScript Engine velocity.noarch : Java-based template engine wsdl4j.noarch : Web Services Description Language Toolkit for Java xalan-j2.noarch : Java XSLT processor xerces-j2.x86_64 : Java XML parser xmldb-api.noarch : XML:DB API for Java Name and summary matches only, use "search all" for everything. [root@bogon ~]# yum install java Loaded plugins: fastestmirror Setting up Install Process Loading mirror speeds from cached hostfile * atomic: mirrors.hosting.in.th * base: mirrors.163.com * extras: mirrors.btte.net * updates: mirrors.163.com Package 1:java-1.7.0-openjdk-1.7.0.79-2.5.5.3.el6_6.x86_64 already installed and latest version Nothing to do [root@bogon ~]#
结果显示已经安装过了java 1.7。
2.然后就是：
要搞清楚，如何确定已经安装了java：
[root@bogon ~]# java -version java version "1.7.0_79" OpenJDK Runtime Environment (rhel-2.5.5.3.el6_6-x86_64 u79-b14) OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode) [root@bogon ~]#
安装的是OpenJDK。
3.然后再去参考：
CentOS 64位 安装openfire | 在这里-迦楠的后花园
保证Java环境变量已经设置。
搜：
centos 6 install java
参考：
How To Install Java on CentOS and Fedora | DigitalOcean
How to Install JAVA 7 (JDK 7u79) on CentOS/RHEL 7/6/5
算了，直接去安装最新的java 1.8吧：
[root@bogon ~]# yum install java-1.8.0-openjdk-devel.x86_64 Loaded plugins: fastestmirror Setting up Install Process Loading mirror speeds from cached hostfile * atomic: mirrors.hosting.in.th * base: mirrors.163.com * extras: mirrors.btte.net * updates: mirrors.163.com Resolving Dependencies --> Running transaction check ---> Package java-1.8.0-openjdk-devel.x86_64 1:1.8.0.45-28.b13.el6_6 will be installed --> Processing Dependency: java-1.8.0-openjdk = 1:1.8.0.45-28.b13.el6_6 for package: 1:java-1.8.0-openjdk-devel-1.8.0.45-28.b13.el6_6.x86_64 --> Processing Dependency: libawt_xawt.so(SUNWprivate_1.1)(64bit) for package: 1:java-1.8.0-openjdk-devel-1.8.0.45-28.b13.el6_6.x86_64 --> Processing Dependency: libawt_xawt.so()(64bit) for package: 1:java-1.8.0-openjdk-devel-1.8.0.45-28.b13.el6_6.x86_64 --> Running transaction check ---> Package java-1.8.0-openjdk.x86_64 1:1.8.0.45-28.b13.el6_6 will be installed --> Processing Dependency: java-1.8.0-openjdk-headless = 1:1.8.0.45-28.b13.el6_6 for package: 1:java-1.8.0-openjdk-1.8.0.45-28.b13.el6_6.x86_64 --> Running transaction check ---> Package java-1.8.0-openjdk-headless.x86_64 1:1.8.0.45-28.b13.el6_6 will be installed --> Finished Dependency Resolution Dependencies Resolved ==================================================================================================================================== Package Arch Version Repository Size ==================================================================================================================================== Installing: java-1.8.0-openjdk-devel x86_64 1:1.8.0.45-28.b13.el6_6 updates 10 M Installing for dependencies: java-1.8.0-openjdk x86_64 1:1.8.0.45-28.b13.el6_6 updates 187 k java-1.8.0-openjdk-headless x86_64 1:1.8.0.45-28.b13.el6_6 updates 32 M Transaction Summary ==================================================================================================================================== Install 3 Package(s) Total download size: 42 M Installed size: 142 M Is this ok [y/N]: y Downloading Packages: (1/3): java-1.8.0-openjdk-1.8.0.45-28.b13.el6_6.x86_64.rpm | 187 kB 00:00 (2/3): java-1.8.0-openjdk-devel-1.8.0.45-28.b13.el6_6.x86_64.rpm | 10 MB 00:15 (3/3): java-1.8.0-openjdk-headless-1.8.0.45-28.b13.el6_6.x86_64.rpm | 32 MB 00:55 ------------------------------------------------------------------------------------------------------------------------------------ Total 599 kB/s | 42 MB 01:11 Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Installing : 1:java-1.8.0-openjdk-1.8.0.45-28.b13.el6_6.x86_64 1/3 Installing : 1:java-1.8.0-openjdk-headless-1.8.0.45-28.b13.el6_6.x86_64 2/3 Installing : 1:java-1.8.0-openjdk-devel-1.8.0.45-28.b13.el6_6.x86_64 3/3 Verifying : 1:java-1.8.0-openjdk-devel-1.8.0.45-28.b13.el6_6.x86_64 1/3 Verifying : 1:java-1.8.0-openjdk-1.8.0.45-28.b13.el6_6.x86_64 2/3 Verifying : 1:java-1.8.0-openjdk-headless-1.8.0.45-28.b13.el6_6.x86_64 3/3 Installed: java-1.8.0-openjdk-devel.x86_64 1:1.8.0.45-28.b13.el6_6 Dependency Installed: java-1.8.0-openjdk.x86_64 1:1.8.0.45-28.b13.el6_6 java-1.8.0-openjdk-headless.x86_64 1:1.8.0.45-28.b13.el6_6 Complete!
然后再去确认java的版本，结果还是1.7的：
[root@bogon ~]# java -version java version "1.7.0_79" OpenJDK Runtime Environment (rhel-2.5.5.3.el6_6-x86_64 u79-b14) OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)
4.终于找到对应的java在哪里了：
[root@bogon ~]# echo $PATH /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin [root@bogon ~]# ls /usr/lib/jvm jvm/ jvm-commmon/ jvm-exports/ jvm-private/ [root@bogon ~]# ls /usr/lib/jvm jvm/ jvm-commmon/ jvm-exports/ jvm-private/ [root@bogon ~]# ls /usr/lib/jvm/j java/ jre-1.5.0/ java-1.5.0-gcj-1.5.0.0/ jre-1.5.0-gcj/ java-1.7.0/ jre-1.7.0/ java-1.7.0-openjdk-1.7.0.79.x86_64/ jre-1.7.0-openjdk.x86_64/ java-1.7.0-openjdk.x86_64/ jre-1.8.0/ java-1.8.0/ jre-1.8.0-openjdk/ java-1.8.0-openjdk/ jre-1.8.0-openjdk-1.8.0.45-28.b13.el6_6.x86_64/ java-1.8.0-openjdk-1.8.0.45-28.b13.el6_6.x86_64/ jre-gcj/ java-openjdk/ jre-openjdk/ jre/ [root@bogon ~]# ls /usr/lib/jvm/java- java-1.5.0-gcj-1.5.0.0/ java-1.8.0/ java-1.7.0/ java-1.8.0-openjdk/ java-1.7.0-openjdk-1.7.0.79.x86_64/ java-1.8.0-openjdk-1.8.0.45-28.b13.el6_6.x86_64/ java-1.7.0-openjdk.x86_64/ java-openjdk/ [root@bogon ~]# ls /usr/lib/jvm/java-1. java-1.5.0-gcj-1.5.0.0/ java-1.8.0/ java-1.7.0/ java-1.8.0-openjdk/ java-1.7.0-openjdk-1.7.0.79.x86_64/ java-1.8.0-openjdk-1.8.0.45-28.b13.el6_6.x86_64/ java-1.7.0-openjdk.x86_64/ [root@bogon ~]# ls /usr/lib/jvm/java-1.7.0-openjdk java-1.7.0-openjdk-1.7.0.79.x86_64/ java-1.7.0-openjdk.x86_64/ [root@bogon ~]# ls /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.79.x86_64/ ASSEMBLY_EXCEPTION bin demo include jre lib LICENSE sample src.zip tapset THIRD_PARTY_README [root@bogon ~]#
重新配置环境变量，还是用，相对较流行的1.7的java吧（不用最新的1.8的java了）：
[root@bogon ~]# vi ~/.bashrc
# .bashrc
# User specific aliases and functions
alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'
# Source global definitions
if [ -f /etc/bashrc ]; then
. /etc/bashrc
fi
export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.79.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
".bashrc" 17L, 368C written
[root@bogon ~]# source ~/.bashrc
[root@bogon ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.79.x86_64/bin
[root@bogon ~]# java -version
java version "1.7.0_79"
OpenJDK Runtime Environment (rhel-2.5.5.3.el6_6-x86_64 u79-b14)
OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)
【总结】
此处的CentOS 6中，默认已经安装了Java 1.7了，可通过：
java –version
去查看当前已安装的java版本。
然后也可以根据自己需要，去安装其他不同的版本，比如：
通过：
yum search java
找到很多不同版本：
java-1.5.0-gcj.x86_64 : JPackage runtime compatibility layer for GCJ java-1.5.0-gcj-devel.x86_64 : JPackage development compatibility layer for GCJ java-1.5.0-gcj-javadoc.x86_64 : API documentation for libgcj java-1.5.0-gcj-src.x86_64 : Source files for libgcj java-1.6.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.6.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.6.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.6.0-openjdk-javadoc.x86_64 : OpenJDK API Documentation java-1.6.0-openjdk-src.x86_64 : OpenJDK Source Bundle java-1.7.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.7.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.7.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.7.0-openjdk-javadoc.noarch : OpenJDK API Documentation java-1.7.0-openjdk-src.x86_64 : OpenJDK Source Bundle java-1.8.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.8.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.8.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.8.0-openjdk-headless.x86_64 : OpenJDK Runtime Environment java-1.8.0-openjdk-javadoc.noarch : OpenJDK API Documentation java-1.8.0-openjdk-src.x86_64 : OpenJDK Source Bundle
根据需要，去安装自己想要的版本。
比如：
yum install java-1.8.0-openjdk-devel.x86_64
然后，在安装完毕之后，再去设置对应的java的环境变量：
vi ~/.bashrc
添加对应的配置。此处还是使用默认安装的1.7版本的java：
export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.79.x86_64 export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export PATH=$PATH:$JAVA_HOME/bin
可以根据自己的需求，把路径换成其他对应不同版本，即可。
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