(一)安装JAVA
1、检查java环境 java -version,不存在安装。
2、yum -y list java*

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Installed Packages
javapackages-tools.noarch 3.4.1-11.1.al7 @base
Available Packages
java-1.6.0-openjdk.x86_64 1:1.6.0.40-1.13.12.9.4.al7 base
java-1.6.0-openjdk-demo.x86_64 1:1.6.0.40-1.13.12.9.4.al7 base
java-1.6.0-openjdk-devel.x86_64 1:1.6.0.40-1.13.12.9.4.al7 base
java-1.6.0-openjdk-javadoc.x86_64 1:1.6.0.40-1.13.12.9.4.al7 base
java-1.6.0-openjdk-src.x86_64 1:1.6.0.40-1.13.12.9.4.al7 base
java-1.7.0-openjdk.x86_64 1:1.7.0.121-2.6.8.0.1.al7 updates
java-1.7.0-openjdk-accessibility.x86_64 1:1.7.0.121-2.6.8.0.1.al7 updates
java-1.7.0-openjdk-demo.x86_64 1:1.7.0.121-2.6.8.0.1.al7 updates
java-1.7.0-openjdk-devel.x86_64 1:1.7.0.121-2.6.8.0.1.al7 updates
java-1.7.0-openjdk-headless.x86_64 1:1.7.0.121-2.6.8.0.1.al7 updates
java-1.7.0-openjdk-javadoc.noarch 1:1.7.0.121-2.6.8.0.1.al7 updates
java-1.7.0-openjdk-src.x86_64 1:1.7.0.121-2.6.8.0.1.al7 updates
java-1.8.0-openjdk.x86_64 1:1.8.0.111-1.b15.2.al7 updates
java-1.8.0-openjdk-accessibility.x86_64 1:1.8.0.111-1.b15.2.al7 updates
java-1.8.0-openjdk-accessibility-debug.x86_64 1:1.8.0.111-1.b15.2.al7 updates
java-1.8.0-openjdk-debug.x86_64 1:1.8.0.111-1.b15.2.al7 updates
java-1.8.0-openjdk-demo.x86_64 1:1.8.0.111-1.b15.2.al7 updates
java-1.8.0-openjdk-demo-debug.x86_64 1:1.8.0.111-1.b15.2.al7 updates
java-1.8.0-openjdk-devel.x86_64 1:1.8.0.111-1.b15.2.al7 updates
java-1.8.0-openjdk-devel-debug.x86_64 1:1.8.0.111-1.b15.2.al7 updates
java-1.8.0-openjdk-headless.x86_64 1:1.8.0.111-1.b15.2.al7 updates
java-1.8.0-openjdk-headless-debug.x86_64 1:1.8.0.111-1.b15.2.al7 updates
java-1.8.0-openjdk-javadoc.noarch 1:1.8.0.111-1.b15.2.al7 updates
java-1.8.0-openjdk-javadoc-debug.noarch 1:1.8.0.111-1.b15.2.al7 updates
java-1.8.0-openjdk-javadoc-zip.noarch 1:1.8.0.102-4.b14.4.al7 base
java-1.8.0-openjdk-javadoc-zip-debug.noarch 1:1.8.0.102-4.b14.4.al7 base
java-1.8.0-openjdk-src.x86_64 1:1.8.0.111-1.b15.2.al7 updates
java-1.8.0-openjdk-src-debug.x86_64 1:1.8.0.111-1.b15.2.al7 updates
java-atk-wrapper.i686 0.30.4-5.1.al7 base
java-atk-wrapper.x86_64 0.30.4-5.1.al7 base
java-dirq.noarch 1.8-1.el7 epel
java-dirq-javadoc.noarch 1.8-1.el7 epel
java-oauth.noarch 20100601-13.el7 epel
java-oauth-javadoc.noarch 20100601-13.el7 epel
java_cup.noarch 1:0.11a-16.1.al7 base
java_cup-javadoc.noarch 1:0.11a-16.1.al7 base
java_cup-manual.noarch 1:0.11a-16.1.al7 base
javacc.noarch 5.0-10.1.al7 base
javacc-demo.noarch 5.0-10.1.al7 base
javacc-javadoc.noarch 5.0-10.1.al7 base
javacc-manual.noarch 5.0-10.1.al7 base
javacc-maven-plugin.noarch 2.6-17.1.al7 base
javacc-maven-plugin-javadoc.noarch 2.6-17.1.al7 base
javamail.noarch 1.4.6-8.1.al7 base
javamail-javadoc.noarch 1.4.6-8.1.al7 base
javaparser.noarch 1.0.11-3.el7 epel
javaparser-javadoc.noarch 1.0.11-3.el7 epel
javassist.noarch 3.16.1-10.1.al7 base
javassist-javadoc.noarch 3.16.1-10.1.al7 base
javastroke.x86_64 0.5.1-33.el7 epel
javawriter.noarch 2.5.1-4.el7 epel
javawriter-javadoc.noarch 2.5.1-4.el7 epel

3、yum install java-1.7.0-openjdk.x86_64 如卸载使用 yum -y remove java-1.7.0-openjdk*

4、使用

若您安装的是 JRE：

export JAVA_HOME=$(dirname $(dirname $(readlink -f $(which java))))

若您安装的是 JDK：

export JAVA_HOME=$(dirname $(dirname $(readlink -f $(which javac)))) 
使用JRE

5、将export JAVA_HOME=$(dirname $(dirname $(readlink -f $(which java))))

   export CLASSPATH=.:$JAVA_HOME/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar  

    export PATH=$PATH:$JAVA_HOME/bin  

添加到etc/profile最下边，后两句不加可能会有一些问题。

(二）安装tomcat

(1)进入/usr/local/

(2)wget http://mirrors.hust.edu.cn/apache/tomcat/tomcat-7/v7.0.82/bin/apache-tomcat-7.0.82.tar.gz

(3)tar -zxv -f apache-tomcat-7.0.82.tar.gz

(4)mv apache-tomcat-7.0.82 tomcat

(5)cd /usr/local/tomcat/bin

(6)./startup.sh即可启动，如想开机运行放入启动文件里。