java安装环境变量-Java问题

Environment variables for java installation(java安装环境变量)

本文介绍了java安装环境变量的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

How to set the environment variables for Java in Windows (the classpath)?

解决方案

Java SE Development Kit 8u112 on a 64-bit Windows 7 or Windows 8

Set the following user environment variables (== environment variables of type user variables)

JAVA_HOME : C:Program FilesJavajdk1.8.0_112
JDK_HOME : %JAVA_HOME%
JRE_HOME : %JAVA_HOME%jre
CLASSPATH : .;%JAVA_HOME%lib;%JAVA_HOME%jrelib
PATH : your-unique-entries;%JAVA_HOME%in (make sure that the longish your-unique-entries does not contain any other references to another Java installation folder.

Note for Windows users on 64-bit systems:

Progra~1 = 'Program Files'
Progra~2 = 'Program Files(x86)'

Notice that these environment variables are derived from the "root" environment variable JAVA_HOME. This makes it easy to update your environment variables when updating the JDK. Just point JAVA_HOME to the fresh installation.

There is a blogpost explaining the rationale behind all these environment variables.

Optional recommendations

Add an user environment variable JAVA_TOOL_OPTIONS with value -Dfile.encoding="UTF-8". This ensures that Java (and tools such as Maven) will run with a Charset.defaultCharset() of UTF-8 (instead of the default Windows-1252). This has saved a lot of headaches when wirking with my own code and that of others, which unfortunately often assume the (sane) default encoding UTF-8.
When JDK is installed, it adds to the system environment variable Path an entry C:ProgramDataOracleJavajavapath;. I anecdotally noticed that the links in that directory didn't get updated during an JDK installation update. So it's best to remove C:ProgramDataOracleJavajavapath; from the Path system environment variable in order to have a consistent environment.

这篇关于java安装环境变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！