JAVA读取环境变量
import java.io.BufferedReader;import java.io.InputStreamReader;import java.util.Properties;class Test{ // 返回当前系统变量的函数，结果放在一个Properties里边，这里只针对win2k以上的，其它系统可以自己改进 public Properties getEnv() throws Exception {Properties prop = new Properties();String OS = System.getProperty("os.name").toLowerCase();System.out.println("操作系统:" + OS);Process p = null;if (OS.indexOf("windows") > -1){ p = Runtime.getRuntime().exec("cmd /c set");} if(OS.indexOf("linux") > -1) { p = Runtime.getRuntime().exec("sh -c set"); }BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));String line;while ((line = br.readLine()) != null){ int i = line.indexOf("="); if (i > -1) { String key = line.substring(0, i); String value = line.substring(i + 1); prop.setProperty(key, value); }}return prop; } // 具体用法 public static void main(String[] args) {try{ Test sp = new Test(); Properties p = sp.getEnv(); System.out.println(p.getProperty("PATH")); // 注意大小写，比如读取PATH。Linux下为PATH；Windows为Path}catch (Exception e){ System.out.println(e);} }}
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