1.檢查一下系統中的jdk版本

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1. $>java?-version??

java version "1.7.0_"
OpenJDK Runtime Environment (IcedTea6 1.11.1) (rhel-1.45.1.11.1.el6-x86_64)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

2.檢測JDK安裝包

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1. $>rpm?-qa?|?grep?java??

avapackages-tools-3.4.1-6.el7_0.noarch
tzdata-java-2014i-1.el7.noarch
java-1.7.0-openjdk-headless-1.7.0.71-2.5.3.1.el7_0.x86_64
java-1.7.0-openjdk-1.7.0.71-2.5.3.1.el7_0.x86_64
python-javapackages-3.4.1-6.el7_0.noarch

3.卸載OpenJDK

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1. $>rpm?-e?--nodeps?tzdata-java-2014i-1.el7.noarch??

2. $>rpm?-e?--nodeps?java-1.7.0-openjdk-headless-1.7.0.71-2.5.3.1.el7_0.x86_64??

3. $>rpm?-e?--nodeps?java-1.7.0-openjdk-1.7.0.71-2.5.3.1.el7_0.x86_64 ?

4.安裝新的Jdk1.8.0_31

?解壓縮tar.gz

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1. $>mkdir??-p?/usr/lib/jvm??

2. $>tar??-zxvf?jdk1.8.0_31.tar.gz?-C??/usr/lib/jvm ?

5.設置環境變量

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1. $>?vi????/etc/profile??

在最后添加：

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1. export?JAVA_HOME=/usr/lib/jvm/jdk1.8.0_31??

2. export?JRE_HOME=${JAVA_HOME}/jre??

3. export?CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib??

4. export??PATH=${JAVA_HOME}/bin:$PATH??

6.執行profile

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1. $>source?/etc/profile ?

7.檢查新安裝的jdk

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1. $>java?-version ?