读取本机的Java运行环境和相关配置文件的内容-白红宇

import java.util.*;

import java.io.*;

class TestProperty

{

public

static

void main(String[] args)

{

Properties psys=System.getProperties();

String path = psys.getProperty(

"user.dir");

//程序所在的路径；

// psys.list(System.out);

//写文件

try

{

File f =

new File(path+

"\\config\\test.txt");

FileWriter fw =

new FileWriter(f);

PrintWriter pw =

new PrintWriter(fw);

Enumeration em= psys.propertyNames();

while(em.hasMoreElements())

{

String strKey=(String)em.nextElement();

String strValue = psys.getProperty(strKey);

pw.println(strKey+

"="+strValue);

}

fw.close();

//读文件

File f1 =

new File(path+

"\\config\\test.txt");

FileReader fr =

new FileReader(f1);

BufferedReader br=

new BufferedReader(fr);

String content ="";

String str ="";

while((content=br.readLine())!=

null)

{

str += content+

"\r\n";

}

System.out.println(str);

}

catch(Exception e)

{

e.printStackTrace();

}

得到的test.txt文件的内容:

java.runtime.name=Java(TM) SE Runtime Environment

sun.boot.library.path=C:\Program Files\Java\jdk1.6.0_03\jre\bin

java.vm.version=1.6.0_03-b05

java.vm.vendor=Sun Microsystems Inc.

java.vendor.url=http://java.sun.com/

path.separator=;

java.vm.name=Java HotSpot(TM) Client VM

file.encoding.pkg=sun.io

user.country=CN

sun.java.launcher=SUN_STANDARD

sun.os.patch.level=Service Pack 2

java.vm.specification.name=Java Virtual Machine Specification

user.dir=D:\『Java』Java is not difficult By SunXin\javaLessons\lesson8

java.runtime.version=1.6.0_03-b05

java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment

java.endorsed.dirs=C:\Program Files\Java\jdk1.6.0_03\jre\lib\endorsed

os.arch=x86

java.io.tmpdir=C:\DOCUME~1\zhangran\LOCALS~1\Temp\

line.separator=

java.vm.specification.vendor=Sun Microsystems Inc.

user.variant=

os.name=Windows XP

sun.jnu.encoding=GBK

java.library.path=C:\Program Files\Java\jdk1.6.0_03\bin;.;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;E:\apache-tomcat-6.0.10\bin;D:\oracle\product\10.1.0\Db_1\BIN;C:\Program Files\Java\jdk1.6.0_03\bin;d:\oracle\product\10.1.0\Db_1\jre\1.4.2\bin\client;d:\oracle\product\10.1.0\Db_1\jre\1.4.2\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\Common Files\Thunder Network\KanKan\Codecs;C:\Program Files\Microsoft SQL Server\90\Tools\binn\;C:\Program Files\Microsoft SQL Server\80\Tools\Binn\;C:\PROGRA~1\ATT\Graphviz\bin;;C:\PROGRA~1\ATT\Graphviz\bin;;C:\PROGRA~1\ATT\Graphviz\bin;D:\oracle\product\10.1.0\Db_1\BIN;d:\oracle\product\10.1.0\Db_1\jre\1.4.2\bin\client;d:\oracle\product\10.1.0\Db_1\jre\1.4.2\bin;;C:\Program Files\Java\jdk1.6.0_03\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;d:\Program Files\StormII\Codec;d:\Program Files\StormII;C:\Program Files\SSH Communications Security\SSH Secure Shell;d:\Program Files\StormII\Codec;d:\Program Files\StormII;d:\Program Files\StormII\Codec;d:\Program Files\StormII;d:\Program Files\StormII\Codec;d:\Program Files\StormII;d:\Program Files\StormII\Codec;d:\Program Files\StormII;d:\Program Files\StormII\Codec;d:\Program Files\StormII;d:\Program Files\StormII\Codec;d:\Program Files\StormII;d:\Program Files\StormII\Codec;d:\Program Files\StormII

java.specification.name=Java Platform API Specification

java.class.version=50.0

sun.management.compiler=HotSpot Client Compiler

os.version=5.1

user.home=C:\Documents and Settings\zhangran

user.timezone=

java.awt.printerjob=sun.awt.windows.WPrinterJob

file.encoding=GBK

java.specification.version=1.6

user.name=tiger

java.class.path=.;C:\Program Files\Java\jdk1.6.0_03\bin;C:\Program Files\Java\jdk1.6.0_03\lib\dt.jar;C:\Program Files\Java\jdk1.6.0_03\lib\tools.jar;C:\Program Files\Java\jre1.6.0_03\lib\ext\servlet-api.jar;E:\apache-tomcat-6.0.10\lib\servlet-api.jar

java.vm.specification.version=1.0

sun.arch.data.model=32

java.home=C:\Program Files\Java\jdk1.6.0_03\jre

java.specification.vendor=Sun Microsystems Inc.

user.language=zh

awt.toolkit=sun.awt.windows.WToolkit

java.vm.info=mixed mode, sharing

java.version=1.6.0_03

java.ext.dirs=C:\Program Files\Java\jdk1.6.0_03\jre\lib\ext;C:\WINDOWS\Sun\Java\lib\ext

sun.boot.class.path=C:\Program Files\Java\jdk1.6.0_03\jre\lib\resources.jar;C:\Program Files\Java\jdk1.6.0_03\jre\lib\rt.jar;C:\Program Files\Java\jdk1.6.0_03\jre\lib\sunrsasign.jar;C:\Program Files\Java\jdk1.6.0_03\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.6.0_03\jre\lib\jce.jar;C:\Program Files\Java\jdk1.6.0_03\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.6.0_03\jre\classes

java.vendor=Sun Microsystems Inc.

file.separator=\

java.vendor.url.bug=http://java.sun.com/cgi-bin/bugreport.cgi

sun.cpu.endian=little

sun.io.unicode.encoding=UnicodeLittle

sun.desktop=windows

sun.cpu.isalist=pentium_pro+mmx pentium_pro pentium+mmx pentium i486 i386 i86

通过test.txt文件内容，可以发现我们自己配置环境变量等信息，也可以知道java运行需要哪些配置信息；这就是我把这些内容贴出来的目的，供学习，参考！

本文转自 yuwenhu 51CTO博客，原文链接：http://blog.51cto.com/yuwenhu/200387，如需转载请自行联系原作者