Java的System.getProperty()方法可以获取系统信息的值.

java的System.getProperty()方法可以获取的值
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 

使用时后台代码如下：

package com.transnal.web.action;

import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Properties;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;
import com.transnal.web.UserFactory;

/**
 * 主页 Action,显示有关系统的信息
 * @author RenWeigang
 *
 * @since 2010-11-1
 *
 */
public class MainAction extends ActionSupport {

	private static final long serialVersionUID = 1581860951839343108L;
	
	/**操作系统名字*/
	private String osName;
	
	/**操作系统版本*/
	private String osVersion;
	
	/**服务器名字*/
	private String serverName;
	
	/**服务器端口*/
	private int serverPort;
	
	/**本地IP地址*/
	private String localIP;
	
	/**java运行时环境版本*/
	private String javaVersion;
	
	/**java 运行时环境供应商*/
	private String javaVendor;
	
	/**Java供应商的URL*/
	private String javaVendorUrl;
	
	/**Java 安装目录*/
	private String javaHome;
	
	/**用户的账户名称*/
	private String userName;
	
	/**用户的当前工作目录*/
	private String userDir;
	
	/**当前所使用的数据库*/
	private String currentDB;

	public String execute(){
		osName = System.getProperty("os.name");
		osVersion = System.getProperty("os.version");
		javaVersion = System.getProperty("java.version");
		javaVendor = System.getProperty("java.vendor");
		javaVendorUrl = System.getProperty("java.vendor.url");
		javaHome = System.getProperty("java.home");
		userName = System.getProperty("user.name");
		userDir = System.getProperty("user.dir");
		serverPort = ServletActionContext.getRequest().getLocalPort();
		try {
			localIP = InetAddress.getLocalHost().getHostAddress();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
		try {
			serverName = InetAddress.getByName(localIP).getHostName();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
		InputStream in = UserFactory.class.getResourceAsStream("/spring-jpa.properties");
		Properties p = new Properties();
		if (in != null) {
			try {
				p.load(in);
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		if(p.getProperty("ucmanage.jdbc.driver").equals("com.mysql.jdbc.Driver")){
			currentDB = "MySql";
		}else if(p.getProperty("ucmanage.jdbc.driver").equals("oracle.jdbc.OracleDriver")){
			currentDB = "Oracle";
		}
		return SUCCESS;
	}
	
	public String getOsName() {
		return osName;
	}

	public void setOsName(String osName) {
		this.osName = osName;
	}

	public String getLocalIP() {
		return localIP;
	}

	public void setLocalIP(String localIP) {
		this.localIP = localIP;
	}
	public String getOsVersion() {
		return osVersion;
	}
	public void setOsVersion(String osVersion) {
		this.osVersion = osVersion;
	}
	public String getJavaVersion() {
		return javaVersion;
	}
	public void setJavaVersion(String javaVersion) {
		this.javaVersion = javaVersion;
	}
	public String getJavaVendor() {
		return javaVendor;
	}
	public void setJavaVendor(String javaVendor) {
		this.javaVendor = javaVendor;
	}
	public String getJavaVendorUrl() {
		return javaVendorUrl;
	}
	public void setJavaVendorUrl(String javaVendorUrl) {
		this.javaVendorUrl = javaVendorUrl;
	}
	public String getJavaHome() {
		return javaHome;
	}
	public void setJavaHome(String javaHome) {
		this.javaHome = javaHome;
	}
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}

	public String getServerName() {
		return serverName;
	}

	public void setServerName(String serverName) {
		this.serverName = serverName;
	}

	public int getServerPort() {
		return serverPort;
	}

	public void setServerPort(int serverPort) {
		this.serverPort = serverPort;
	}

	public String getUserDir() {
		return userDir;
	}

	public void setUserDir(String userDir) {
		this.userDir = userDir;
	}

	public String getCurrentDB() {
		return currentDB;
	}

	public void setCurrentDB(String currentDB) {
		this.currentDB = currentDB;
	}
}

前台代码如下：

   <div id="main">
		<div class="blockheader all bb"><img src="Image/Icon/XP16/xp202.gif" />系统信息</div>	
		<div class="blockbody notop ">
			<table width="96%" border="0" align="center" cellpadding="4" cellspacing="1">
              <tr>
                <td width="15%" style="text-align:right">服务器名:</td>
                <td>&nbsp;&nbsp;&nbsp;$!{serverName}</td>
              </tr>
              <tr>
                <td style="text-align:right">服务器IP:</td>
                <td>&nbsp;&nbsp;&nbsp;$!{localIP}</td>
              </tr>
              <tr>
                <td style="text-align:right">服务器端口:</td>
                <td>&nbsp;&nbsp;&nbsp;$!{serverPort}</td>
              </tr>
              <tr>
                <td style="text-align:right">数据库类型:</td>
                <td>&nbsp;&nbsp;&nbsp;$!{currentDB}</td>
              </tr>			  
              <tr>
                <td style="text-align:right">JAVA运行时环境版本:</td>
                <td>&nbsp;&nbsp;&nbsp;$!{javaVersion}</td>
              </tr>
              <tr>
                <td style="text-align:right">JAVA运行环境供应商:</td>
                <td>&nbsp;&nbsp;&nbsp;$!{javaVendor}</td>
              </tr>
              <tr>
                <td style="text-align:right">JAVA供应商的URL:</td>
                <td>&nbsp;&nbsp;&nbsp;<a href="$!{javaVendorUrl}" target="_blank">$!{javaVendorUrl}</a></td>
              </tr>
              <tr>
                <td style="text-align:right">JDK安装目录:</td>
                <td>&nbsp;&nbsp;&nbsp;$!{javaHome}</td>
              </tr>				  
              <tr>
                <td style="text-align:right">程序物理路径:</td>
                <td >$!{userDir}</td>
              </tr>
              <tr>
                <td style="text-align:right">服务器操作系统类型:</td>
                <td>&nbsp;&nbsp;&nbsp;$!{osName}</td>
              </tr>			  
              <tr>
                <td style="text-align:right">服务器操作系统版本:</td>
                <td>&nbsp;&nbsp;&nbsp;$!{osVersion}</td>
              </tr>
              <tr>
                <td style="text-align:right">程序制作:</td>
                <td>&nbsp;&nbsp;&nbsp;<a href="http://www.transnal.com" target="_blank">山西传世科技有限公司</a></td>
              </tr>
            </table>			
		</div>
     </div>