CenterOS7安装java

#进入安装目录
cd /usr/local/soft/java

#wget下载java8
#直接进入官网选择相应的版本进行下载，然后把下载链接复制下来就可以下载了
#不时间的下载链接不一样
wget http://download.oracle.com/otn-pub/java/jdk/8u181-b13/96a7b8442fe848ef90c96a2fad6ed6d1/jdk-8u181-linux-x64.tar.gz?AuthParam=1536908109_e337304e4470458588ad85166db90d18

#解压缩下载的文件
tar -zxvf jdk-8u181-linux-x64.tar.gz

#编辑环境变量文件
vi /etc/profile

#在文件尾部追加以下文件（JAVA_HOME是你安装java的目录地址）
JAVA_HOME=/usr/local/soft/java/jdk1.8.0_181
JRE_HOME=<span class="katex--inline"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>J</mi><mi>A</mi><mi>V</mi><msub><mi>A</mi><mi>H</mi></msub><mi>O</mi><mi>M</mi><mi>E</mi><mi mathvariant="normal">/</mi><mi>j</mi><mi>r</mi><mi>e</mi><mi>P</mi><mi>A</mi><mi>T</mi><mi>H</mi><mo>=</mo></mrow><annotation encoding="application/x-tex">JAVA_HOME/jre
PATH=</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"><span class="mord mathnormal" style="margin-right:0.09618em;">J</span><span class="mord mathnormal">A</span><span class="mord mathnormal" style="margin-right:0.22222em;">V</span><span class="mord"><span class="mord mathnormal">A</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3283em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight" style="margin-right:0.08125em;">H</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.05764em;">OME</span><span class="mord">/</span><span class="mord mathnormal" style="margin-right:0.05724em;">j</span><span class="mord mathnormal">re</span><span class="mord mathnormal" style="margin-right:0.13889em;">P</span><span class="mord mathnormal">A</span><span class="mord mathnormal" style="margin-right:0.13889em;">T</span><span class="mord mathnormal" style="margin-right:0.08125em;">H</span><span class="mspace" style="margin-right:0.2778em;"><span class="mrel">=</span></span></span></span></span>PATH:<span class="katex--inline"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>J</mi><mi>A</mi><mi>V</mi><msub><mi>A</mi><mi>H</mi></msub><mi>O</mi><mi>M</mi><mi>E</mi><mi mathvariant="normal">/</mi><mi>b</mi><mi>i</mi><mi>n</mi><mo>:</mo></mrow><annotation encoding="application/x-tex">JAVA_HOME/bin:</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"><span class="mord mathnormal" style="margin-right:0.09618em;">J</span><span class="mord mathnormal">A</span><span class="mord mathnormal" style="margin-right:0.22222em;">V</span><span class="mord"><span class="mord mathnormal">A</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3283em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight" style="margin-right:0.08125em;">H</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.05764em;">OME</span><span class="mord">/</span><span class="mord mathnormal">bin</span><span class="mspace" style="margin-right:0.2778em;"><span class="mrel">:</span></span></span></span></span>JRE_HOME/bin
CLASSPATH=:<span class="katex--inline"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>J</mi><mi>A</mi><mi>V</mi><msub><mi>A</mi><mi>H</mi></msub><mi>O</mi><mi>M</mi><mi>E</mi><mi mathvariant="normal">/</mi><mi>l</mi><mi>i</mi><mi>b</mi><mi mathvariant="normal">/</mi><mi>d</mi><mi>t</mi><mi mathvariant="normal">.</mi><mi>j</mi><mi>a</mi><mi>r</mi><mo>:</mo></mrow><annotation encoding="application/x-tex">JAVA_HOME/lib/dt.jar:</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"><span class="mord mathnormal" style="margin-right:0.09618em;">J</span><span class="mord mathnormal">A</span><span class="mord mathnormal" style="margin-right:0.22222em;">V</span><span class="mord"><span class="mord mathnormal">A</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3283em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight" style="margin-right:0.08125em;">H</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.05764em;">OME</span><span class="mord">/</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">ib</span><span class="mord">/</span><span class="mord mathnormal">d</span><span class="mord mathnormal">t</span><span class="mord">.</span><span class="mord mathnormal">ja</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mspace" style="margin-right:0.2778em;"><span class="mrel">:</span></span></span></span></span>JAVA_HOME/lib/tools.jar:$JRE_HOME/lib/dt.jar
export JAVA_HOME JRE_HOME PATH CLASSPATH
#刷新环境变量配置文件
source /etc/profile

#查看jdk是否安装成功
java -version
#出现的信息为
java version "1.8.0_181"
Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)
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