Notes 2023-09-04

out.print("");
System.out.println("");

new cat.val
.var

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<form action="doForm.jsp" method="post">

</form>

TODO：https://juejin.cn/post/7208099384072224827

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request.getParameter();
request.getParameterValues();

String.join();

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Java

• JDK 在 macOS 上的默认安装目录：/Library/Java/JavaVirtualMachines

# Set Java Environment Variables

# Check if JAVA_HOME is not already set
if [ -z "$JAVA_HOME" ]; then
  # Replace this path with your actual Java installation path
  JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk-1.8.jdk/Contents/Home

  # Add JAVA_HOME to the PATH
  export PATH=$PATH:$JAVA_HOME

  # Export JAVA_HOME so other applications can use it
  export JAVA_HOME
fi

export

Command to mark shell variables in the current environment to be exported with any newly forked child processes.

# To show current shell attributes:
export
# Set a new environment variable:
export VARIABLE=value
# Remove an environment variable:
export -n VARIABLE
# Append something to the PATH variable:
export PATH=$PATH:path/to/append

$ java -version
java version "1.8.0_381"
Java(TM) SE Runtime Environment (build 1.8.0_381-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.381-b09, mixed mode)

IntelliJ IDEA Ultimate 2019.2.4

Abstract

***参见：<https://www.cnblogs.com/beast-king/p/14458378.html>***

1. New Java Enterprise Project

2. Tomcat configurations

On frame deactivation: Update class and resources

Java Webapps Tutorial

Abstract

参见：https://cs.lmu.edu/~ray/notes/jw/

1. Get Tomcat
2. Start Tomcat
3. Write a trivial webapp of your own

1. Get Tomcat

apache-tomcat-10.1.13 $ tree -d -L 1
.
├── bin     # Scripts, including startup and shutdown
├── conf    # Config files for tomcat (that you can tweak!)
├── lib     # Libraries used when Tomcat is running
├── logs    # Tomcat writes its logs here (empty on fresh install)
├── temp    # Tomcat writes stuff here
├── webapps     # Put your webapps under here
|     |__ ... # (each subdirectory is a webapp)
└── work    # Tomcat writes stuff here (empty on fresh install)

8 directories

apache-tomcat-10.1.13/bin $ ls
bootstrap.jar                migrate.bat
catalina-tasks.xml           migrate.sh
catalina.bat                 setclasspath.bat
catalina.sh                  setclasspath.sh
ciphers.bat                  shutdown.bat
ciphers.sh                   shutdown.sh
commons-daemon-native.tar.gz startup.bat
commons-daemon.jar           startup.sh
configtest.bat               tomcat-juli.jar
configtest.sh                tomcat-native.tar.gz
daemon.sh                    tool-wrapper.bat
digest.bat                   tool-wrapper.sh
digest.sh                    version.bat
makebase.bat                 version.sh
makebase.sh

apache-tomcat-10.1.13/bin $ ./version.sh
Using CATALINA_BASE:   /Users/username/Environment/apache-tomcat-10.1.13
Using CATALINA_HOME:   /Users/username/Environment/apache-tomcat-10.1.13
Using CATALINA_TMPDIR: /Users/username/Environment/apache-tomcat-10.1.13/temp
Using JRE_HOME:        /Library/Java/JavaVirtualMachines/jdk-17.0.2.jdk/Contents/Home
Using CLASSPATH:       /Users/username/Environment/apache-tomcat-10.1.13/bin/bootstrap.jar:/Users/username/Environment/apache-tomcat-10.1.13/bin/tomcat-juli.jar
Using CATALINA_OPTS:
Server version: Apache Tomcat/10.1.13
Server built:   Aug 23 2023 21:34:59 UTC
Server number:  10.1.13.0
OS Name:        Mac OS X
OS Version:     14.0
Architecture:   aarch64
JVM Version:    17.0.2+8-LTS-86
JVM Vendor:     Oracle Corporation

2. Start Tomcat

# Unix or macOS
$ $CATALINA_HOME/bin/startup.sh
# Windows
%CATALINA_HOME%\bin\startup.bat

apache-tomcat-10.1.13/webapps $ tree -d -L 1
$CATALINA_HOME
├── ROOT
├── docs
├── examples
├── host-manager
└── manager

6 directories

3. Write a trivial webapp of your own