[英]Platform-independent way to start program on PATH?
Java 中是否有一種獨立於平台的方式來啟動一個外部進程來執行它使用系統路徑找到的程序?
它至少應該在 Windows、Linux 和 Mac 上工作。
通常,您必須提供可執行文件的完整路徑,如下所示:
new ProcessBuilder("/some/path/execfile", "arg").start();
可以通過啟動 shell 來啟動系統路徑上的程序:
new ProcessBuilder("/bin/bash", "-c", "execfile", "arg").start();
但這在 OS:s 之間是不可移植的。 (這是給這個問題的解決方案。)
ProcessBuilder
確實使用$PATH
。
import java.io.*;
public class ProcessBuilderTest {
public static void main(String... args) throws Exception {
ProcessBuilder pb = new ProcessBuilder(args);
pb.redirectErrorStream(true);
Process p = pb.start();
int exitCode = p.waitFor();
printStream(p.getInputStream());
printStream(p.getErrorStream());
System.out.println("Exit code: " + exitCode);
}
static void printStream(InputStream stream) throws IOException {
try (BufferedReader br = new BufferedReader(new InputStreamReader(stream))) {
String line;
while ((line = br.readLine()) != null) {
System.out.println(line);
}
}
}
}
在 MacOS 上運行:
robert@mac:~$ java ProcessBuilderTest.java ls *.java
ProcessBuilderTest.java
Exit code: 0
robert@mac:~$ java ProcessBuilderTest.java ls *.class
ls: cannot access '*.class': No such file or directory
Exit code: 2
robert@mac:~$ java ProcessBuilderTest.java which ls
/usr/local/opt/coreutils/libexec/gnubin/ls
Exit code: 0
robert@mac:~$
Linux 上相同:
robert@linux:~$ java ProcessBuilderTest.java ls *.java
ProcessBuilderTest.java
Exit code: 0
robert@linux:~$ java ProcessBuilderTest.java ls *.class
ls: cannot access '*.class': No such file or directory
Exit code: 2
robert@linux:~$ java ProcessBuilderTest.java which ls
/usr/bin/ls
Exit code: 0
robert@linux:~$
我不使用 Windows,所以無法對此進行測試。
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