您好，我對(duì)Java有一些疑問(wèn)。這是我的代碼：public static void main(String[] args) throws Exception { Process pr = Runtime.getRuntime().exec("java -version"); BufferedReader in = new BufferedReader(new InputStreamReader(pr.getInputStream())); String line; while ((line = in.readLine()) != null) { System.out.println(line); } pr.waitFor(); System.out.println("ok!"); in.close(); System.exit(0);}在該代碼中，我嘗試獲取Java版本命令執(zhí)行是可以的，但是我無(wú)法讀取輸出，只是返回null。為什么？
3 回答
慕田峪4524236
TA貢獻(xiàn)1875條經(jīng)驗(yàn) 獲得超5個(gè)贊
使用getErrorStream（）。
BufferedReader in = new BufferedReader(new InputStreamReader(pr.getErrorStream()));
編輯：
您可以使用ProcessBuilder（也可以閱讀文檔）
ProcessBuilder ps=new ProcessBuilder("java.exe","-version");
//From the DOC: Initially, this property is false, meaning that the
//standard output and error output of a subprocess are sent to two
//separate streams
ps.redirectErrorStream(true);
Process pr = ps.start();
BufferedReader in = new BufferedReader(new InputStreamReader(pr.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
System.out.println(line);
}
pr.waitFor();
System.out.println("ok!");
in.close();
System.exit(0);
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