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System.getProperty()
通过System.getProperty()可以获取很多值，究竟能获得哪些值，今天写了个小程序看了下（为了看起来更清晰，每个properties后面加了横线）：
package test; import java.util.Properties; import java.util.Set; public class Test { public static void main(String[] args) { Properties properties = System.getProperties(); Set<Object> keySet = properties.keySet(); for(Object p:keySet){ System.out.println(p+":"+System.getProperty((String)p));
System.out.println("----------------------------------------------------------------------"); } } }
运行结果如下：
java.runtime.name:Java(TM) SE Runtime Environment ---------------------------------------------------------------------- sun.boot.library.path:E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\bin ---------------------------------------------------------------------- java.vm.version:24.45-b08 ---------------------------------------------------------------------- java.vm.vendor:Oracle Corporation ---------------------------------------------------------------------- java.vendor.url:http://java.oracle.com/ ---------------------------------------------------------------------- path.separator:; ---------------------------------------------------------------------- java.vm.name:Java HotSpot(TM) 64-Bit Server VM ---------------------------------------------------------------------- file.encoding.pkg:sun.io ---------------------------------------------------------------------- user.country:CN ---------------------------------------------------------------------- user.script: ---------------------------------------------------------------------- sun.java.launcher:SUN_STANDARD ---------------------------------------------------------------------- sun.os.patch.level: ---------------------------------------------------------------------- java.vm.specification.name:Java Virtual Machine Specification ---------------------------------------------------------------------- user.dir:E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform ---------------------------------------------------------------------- java.runtime.version:1.7.0_45-b18 ---------------------------------------------------------------------- java.awt.graphicsenv:sun.awt.Win32GraphicsEnvironment ---------------------------------------------------------------------- java.endorsed.dirs:E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\endorsed ---------------------------------------------------------------------- os.arch:amd64 ---------------------------------------------------------------------- java.io.tmpdir:C:\Users\andong\AppData\Local\Temp---------------------------------------------------------------------- line.separator: ---------------------------------------------------------------------- java.vm.specification.vendor:Oracle Corporation ---------------------------------------------------------------------- user.variant: ---------------------------------------------------------------------- os.name:Windows 8 ---------------------------------------------------------------------- sun.jnu.encoding:GBK ---------------------------------------------------------------------- java.library.path:E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\ProgramData\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;E:\UltraEdit;E:\TortoiseSVN\bin;E:\WinSCP\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;E:\OpenSSH for Windows\bin;C:\Program Files\MySQL\MySQL Utilities 1.6\;E:\SSH Secure Shell;C:\Users\andong\AppData\Local\Microsoft\WindowsApps;;. ---------------------------------------------------------------------- java.specification.name:Java Platform API Specification ---------------------------------------------------------------------- java.class.version:51.0 ---------------------------------------------------------------------- sun.management.compiler:HotSpot 64-Bit Tiered Compilers ---------------------------------------------------------------------- os.version:6.2 ---------------------------------------------------------------------- user.home:C:\Users\andong ---------------------------------------------------------------------- user.timezone: ---------------------------------------------------------------------- java.awt.printerjob:sun.awt.windows.WPrinterJob ---------------------------------------------------------------------- file.encoding:UTF-8 ---------------------------------------------------------------------- java.specification.version:1.7 ---------------------------------------------------------------------- java.class.path:E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\classes;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\bean-validator.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\javax.annotation.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\javax.ejb.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\javax.enterprise.deploy.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\javax.jms.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\javax.management.j2ee.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\javax.persistence.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\javax.resource.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\javax.security.auth.message.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\javax.security.jacc.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\javax.servlet.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\javax.servlet.jsp.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\javax.transaction.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\jaxb-api-osgi.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\jsr311-api.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\mail.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\webservices-api-osgi.jar;E:\MyEclipse Professional 2014\plugins\com.genuitec.eclipse.j2eedt.core_11.5.0.me201311281640\data\libraryset\EE_6\weld-osgi-bundle.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\aopalliance.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\apache-ant-zip.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\bcprov-jdk14-138.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\commons-codec-1.4.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\commons-collections-3.2.1.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\commons-dbcp-1.4.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\commons-discovery-0.2.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\commons-fileupload-1.3.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\commons-io-1.4.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\commons-lang-2.6.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\commons-logging-1.1.1.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\commons-net-3.0.1.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\commons-pool-1.6.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\curvesapi-1.03.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\dom4j-1.6.1.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\httpclient-4.3.1.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\httpcore-4.3.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\jackson-all-1.9.11.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\javacsv.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\jsch-0.1.51.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\jstl-1.2.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\log4j-1.2.16.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\mysql-connector-java-5.1.22.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\org.springframework.aop-3.1.2.RELEASE.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\org.springframework.asm-3.1.2.RELEASE.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\org.springframework.beans-3.1.2.RELEASE.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\org.springframework.context-3.1.2.RELEASE.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\org.springframework.context.support-3.1.2.RELEASE.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\org.springframework.core-3.1.2.RELEASE.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\org.springframework.expression-3.1.2.RELEASE.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\org.springframework.jdbc-3.1.2.RELEASE.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\org.springframework.orm-3.1.2.RELEASE.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\org.springframework.transaction-3.1.2.RELEASE.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\org.springframework.web-3.1.2.RELEASE.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\org.springframework.web.servlet-3.1.2.RELEASE.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\poi-3.14-20160307.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\poi-ooxml-3.14-20160307.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\poi-ooxml-schemas-3.14-20160307.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\quartz-1.6.4.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\rt.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\xmlbeans-2.6.0.jar;E:\MyEclipse Professional 2014\MyEclipse\sinasoftworkspace\ReconciliationPlatform\WebRoot\WEB-INF\lib\zip4j-1.3.2.jar ---------------------------------------------------------------------- user.name:andong ---------------------------------------------------------------------- java.vm.specification.version:1.7 ---------------------------------------------------------------------- sun.java.command:test.Test ---------------------------------------------------------------------- java.home:E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre ---------------------------------------------------------------------- sun.arch.data.model:64 ---------------------------------------------------------------------- user.language:zh ---------------------------------------------------------------------- java.specification.vendor:Oracle Corporation ---------------------------------------------------------------------- awt.toolkit:sun.awt.windows.WToolkit ---------------------------------------------------------------------- java.vm.info:mixed mode ---------------------------------------------------------------------- java.version:1.7.0_45 ---------------------------------------------------------------------- java.ext.dirs:E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\ext;C:\WINDOWS\Sun\Java\lib\ext ---------------------------------------------------------------------- sun.boot.class.path:E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\resources.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\rt.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\sunrsasign.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\jsse.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\jce.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\charsets.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\jfr.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\classes ---------------------------------------------------------------------- java.vendor:Oracle Corporation ---------------------------------------------------------------------- file.separator:---------------------------------------------------------------------- java.vendor.url.bug:http://bugreport.sun.com/bugreport/ ---------------------------------------------------------------------- sun.io.unicode.encoding:UnicodeLittle ---------------------------------------------------------------------- sun.cpu.endian:little ---------------------------------------------------------------------- sun.desktop:windows ---------------------------------------------------------------------- sun.cpu.isalist:amd64 ----------------------------------------------------------------------
上面只是在main方法中测试的，没有涉及服务器，后来又在服务器启动时测试了一下（使用的是tomcat6）,打印如下：
java.runtime.name:Java(TM) SE Runtime Environment ---------------------------------------------------------------------- sun.boot.library.path:E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\bin ---------------------------------------------------------------------- java.vm.version:24.45-b08 ---------------------------------------------------------------------- shared.loader: ---------------------------------------------------------------------- java.vm.vendor:Oracle Corporation ---------------------------------------------------------------------- java.vendor.url:http://java.oracle.com/ ---------------------------------------------------------------------- path.separator:; ---------------------------------------------------------------------- tomcat.util.buf.StringCache.byte.enabled:true ---------------------------------------------------------------------- java.vm.name:Java HotSpot(TM) 64-Bit Server VM ---------------------------------------------------------------------- file.encoding.pkg:sun.io ---------------------------------------------------------------------- user.country:CN ---------------------------------------------------------------------- user.script: ---------------------------------------------------------------------- sun.java.launcher:SUN_STANDARD ---------------------------------------------------------------------- sun.os.patch.level: ---------------------------------------------------------------------- java.vm.specification.name:Java Virtual Machine Specification ---------------------------------------------------------------------- user.dir:E:\apache-tomcat-6.0.43-windows-x86\apache-tomcat-6.0.43\bin ---------------------------------------------------------------------- java.runtime.version:1.7.0_45-b18 ---------------------------------------------------------------------- java.awt.graphicsenv:sun.awt.Win32GraphicsEnvironment ---------------------------------------------------------------------- java.endorsed.dirs:E:\apache-tomcat-6.0.43-windows-x86\apache-tomcat-6.0.43/common/endorsed ---------------------------------------------------------------------- os.arch:amd64 ---------------------------------------------------------------------- java.io.tmpdir:E:\apache-tomcat-6.0.43-windows-x86\apache-tomcat-6.0.43\temp ---------------------------------------------------------------------- line.separator: ---------------------------------------------------------------------- java.vm.specification.vendor:Oracle Corporation ---------------------------------------------------------------------- java.naming.factory.url.pkgs:org.apache.naming ---------------------------------------------------------------------- user.variant: ---------------------------------------------------------------------- os.name:Windows 8 ---------------------------------------------------------------------- sun.jnu.encoding:GBK ---------------------------------------------------------------------- java.library.path:E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\bin;E:\apache-tomcat-6.0.43-windows-x86\apache-tomcat-6.0.43\bin ---------------------------------------------------------------------- java.specification.name:Java Platform API Specification ---------------------------------------------------------------------- java.class.version:51.0 ---------------------------------------------------------------------- sun.management.compiler:HotSpot 64-Bit Tiered Compilers ---------------------------------------------------------------------- sun.io.useCanonCaches:false ---------------------------------------------------------------------- os.version:6.2 ---------------------------------------------------------------------- user.home:C:\Users\andong ---------------------------------------------------------------------- catalina.useNaming:true ---------------------------------------------------------------------- user.timezone:Asia/Shanghai ---------------------------------------------------------------------- java.awt.printerjob:sun.awt.windows.WPrinterJob ---------------------------------------------------------------------- file.encoding:GBK ---------------------------------------------------------------------- java.specification.version:1.7 ---------------------------------------------------------------------- catalina.home:E:\apache-tomcat-6.0.43-windows-x86\apache-tomcat-6.0.43 ---------------------------------------------------------------------- java.class.path:E:\apache-tomcat-6.0.43-windows-x86\apache-tomcat-6.0.43/bin/bootstrap.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45/lib/tools.jar ---------------------------------------------------------------------- user.name:andong ---------------------------------------------------------------------- java.naming.factory.initial:org.apache.naming.java.javaURLContextFactory ---------------------------------------------------------------------- package.definition:sun.,java.,org.apache.catalina.,org.apache.coyote.,org.apache.jasper.,org.apache.naming.,org.apache.tomcat. ---------------------------------------------------------------------- java.vm.specification.version:1.7 ---------------------------------------------------------------------- sun.java.command:org.apache.catalina.startup.Bootstrap start ---------------------------------------------------------------------- java.home:E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre ---------------------------------------------------------------------- sun.arch.data.model:64 ---------------------------------------------------------------------- user.language:zh ---------------------------------------------------------------------- java.specification.vendor:Oracle Corporation ---------------------------------------------------------------------- awt.toolkit:sun.awt.windows.WToolkit ---------------------------------------------------------------------- java.vm.info:mixed mode ---------------------------------------------------------------------- java.version:1.7.0_45 ---------------------------------------------------------------------- java.ext.dirs:E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\ext;C:\WINDOWS\Sun\Java\lib\ext ---------------------------------------------------------------------- sun.boot.class.path:E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\resources.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\rt.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\sunrsasign.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\jsse.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\jce.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\charsets.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\lib\jfr.jar;E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre\classes ---------------------------------------------------------------------- server.loader: ---------------------------------------------------------------------- java.vendor:Oracle Corporation ---------------------------------------------------------------------- catalina.base:E:\apache-tomcat-6.0.43-windows-x86\apache-tomcat-6.0.43 ---------------------------------------------------------------------- file.separator:---------------------------------------------------------------------- java.vendor.url.bug:http://bugreport.sun.com/bugreport/ ---------------------------------------------------------------------- common.loader:${catalina.base}/lib,${catalina.base}/lib/*.jar,${catalina.home}/lib,${catalina.home}/lib/*.jar ---------------------------------------------------------------------- sun.io.unicode.encoding:UnicodeLittle ---------------------------------------------------------------------- sun.cpu.endian:little ---------------------------------------------------------------------- package.access:sun.,org.apache.catalina.,org.apache.coyote.,org.apache.jasper.,org.apache.naming.resources.,org.apache.tomcat.,sun.beans. ---------------------------------------------------------------------- sun.desktop:windows ---------------------------------------------------------------------- sun.cpu.isalist:amd64 ----------------------------------------------------------------------
通过对比，在tomcat中运行时的属性比在main方法中要多一些， 有些值也不太相同。
下表是API提供的properties属性键值和说明，和刚才打印出的相比也不太全：
| 键 | 相关值的描述 |
|---|---|
java.version |
Java 运行时环境版本 |
java.vendor |
Java 运行时环境供应商 |
java.vendor.url |
Java 供应商的 URL |
java.home |
Java 安装目录 |
java.vm.specification.version |
Java 虚拟机规范版本 |
java.vm.specification.vendor |
Java 虚拟机规范供应商 |
java.vm.specification.name |
Java 虚拟机规范名称 |
java.vm.version |
Java 虚拟机实现版本 |
java.vm.vendor |
Java 虚拟机实现供应商 |
java.vm.name |
Java 虚拟机实现名称 |
java.specification.version |
Java 运行时环境规范版本 |
java.specification.vendor |
Java 运行时环境规范供应商 |
java.specification.name |
Java 运行时环境规范名称 |
java.class.version |
Java 类格式版本号 |
java.class.path |
Java 类路径 |
java.library.path |
加载库时搜索的路径列表 |
java.io.tmpdir |
默认的临时文件路径 |
java.compiler |
要使用的 JIT 编译器的名称 |
java.ext.dirs |
一个或多个扩展目录的路径 |
os.name |
操作系统的名称 |
os.arch |
操作系统的架构 |
os.version |
操作系统的版本 |
file.separator |
文件分隔符（在 UNIX 系统中是“/”） |
path.separator |
路径分隔符（在 UNIX 系统中是“:”） |
line.separator |
行分隔符（在 UNIX 系统中是“/n”） |
user.name |
用户的账户名称 |
user.home |
用户的主目录 |
user.dir |
用户的当前工作目录 |
而且从刚才打印的结果看，部分属性的值也并不准确。比如我的系统是windows 10,打印结果是os.name:Windows 8
针对上面main方法和tomcat中的运行结果，重点总结几个可能常用的属性：
- 文件分隔符 file.separator:\
- 路径分隔符 path.separator:;
- 行分隔符 line.separator:\r\n
- 用户当前工作目录 user.dir。需要注意的是在main方法中，指向了当前的项目路径，但是在tomcat中，指向了tomcat的bin目录
- 操作系统名称
os.name。 不过该项并不准确 - java运行时环境版本 java.version:1.7.0_45
- Java 安装目录 java.home:E:\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_64_1.7.0.u45\jre 。该目录是java jre的目录
- 用户的语言 user.language:zh
- 用户名称（计算机名称） user.name:andong ，不过经过测试如果你用微软账户登陆，它这里拿到的还是原来的名字
- 用户所在时区 user.timezone:Asia/Shanghai 不过main方法中并未打印时区
- 还有tomcat下打印了catalina的相关信息：catalina.home:E:\apache-tomcat-6.0.43-windows-x86\apache-tomcat-6.0.43
- catalina.base:E:\apache-tomcat-6.0.43-windows-x86\apache-tomcat-6.0.43
这次的测试结果使用的是jdk1.7，tomcat6，windows10,linux下的情况并未测试
System.getProperty()
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