16.1 Tomcat introduction; 16.2 install jdk;16.3 install Tomcat

Extend:

Java containers compare http://my.oschina.net/diedai/blog/271367

Http://www.360doc.com/content/11/0618/21/16915_127901371.shtml

Relationship among j2ee, j2se, ejb, javabean, serverlet, jsp

Http://blog.csdn.net/ququhu/article/details/73470

Tomcat server.xml configuration details

Http://blog.csdn.net/yuanxuegui2008/article/details/6056754

Methods of database connection commonly used in tomcat

Http://wjw7702.blog.51cto.com/5210820/1109263

16.1 Tomcat introduction

1. Tomcat is a core project of the Jakarta project of the Apache Software Foundation (Apache Software Foundation), which is jointly developed by Apache, Sun and other companies and individuals.

2. The website written by java program is run by tomcat+jdk.

3. Tomcat is a middleware, and it is jdk that really works to parse java scripts.

4. Jdk (java development kit) is the core of the entire java, which contains the java runtime environment and a bunch of java-related tools as well as java basic libraries.

5. The most mainstream jdk is the jdk released by sun. In addition, IBM has also released that openjdk can also be installed with yum on JDK,CentOS.

16.2 install jdk

Download address of jdk official website:

Http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

1. Download it from Google browser and upload it to the centos system / usr/local/src/ directory:

[root@hao-01 ~] # cd / usr/local/src/

[root@hao-01 src] # rz

two。 Unpack:

[root@hao-01 src] # tar zxvf jdk-8u144-linux-x64.tar.gz

3. Move and rename:

[root@hao-01 src] # mv jdk1.8.0_144 / usr/local/jdk1.8

4. Edit the / etc/profile file:

[root@hao-01 src] # vim / etc/profile

Add content:

JAVA_HOME=/usr/local/jdk1.8/

JAVA_BIN=/usr/local/jdk1.8/bin

JRE_HOME=/usr/local/jdk1.8/jre

PATH=$PATH:/usr/local/jdk1.8/bin:/usr/local/jdk1.8/jre/bin

CLASSPATH=/usr/local/jdk1.8/jre/lib:/usr/local/jdk1.8/lib:/usr/local/jdk1.8/jre/lib/charsets.jar

5. To give effect to its file:

[root@hao-01 src] # source / etc/profile

6. View the version number:

[root@hao-01 src] # java-version

7. Is the search openjdk command installed?

[root@hao-01 src] # rpm-qa | grep openjdk

16.3 install Tomcat

1. Go to the download package directory:

[root@hao-01 ~] # cd / usr/local/src

two。 Download the tomcat installation package:

[root@hao-01 src] # wget http://apache.fayea.com/tomcat/tomcat-8/v8.5.20/bin/apache-tomcat-8.5.20.tar.gz

3. Unpack:

[root@hao-01 src] # tar zxvf apache-tomcat-8.5.20.tar.gz

4. Move and rename:

[root@hao-01 src] # mv apache-tomcat-8.5.20 / usr/local/tomcat

5. Start the tomcat service:

[root@hao-01 src] # / usr/local/tomcat/bin/startup.sh

6. Does the search for tomcat start?

[root@hao-01 src] # ps aux | grep tomcat

7. Close the tomcat process:

[root@hao-01 src] # / usr/local/tomcat/bin/shutdown.sh

8. Check the java port number (port 8005 starts slowly):

[root@hao-01 src] # netstat-lntp | grep java

Three ports:

8080 is the port that provides web services

8005 is the management port

Port 8009 is a port for third-party service calls, such as when combining httpd and Tomcat.