我有一个Java项目,它有助于使用youtube-dl查找youtube播放列表中的所有视频信息。这里是Main.java
java block while using shell命令使用进程
import java.io.*;
public class Main {
public static void main(String[] args) throws Exception {
String command1 = "/usr/local/bin/youtube-dl --flat-playlist --dump-single-json https://www.youtube.com/playlist?list=PLFcOH1YaRqUo1yEjY5ly09RFbIpUePF7G";
String command2 = "/usr/local/bin/youtube-dl --flat-playlist --dump-single-json https://www.youtube.com/playlist?list=PLC6A0625DCA9AAE2D";
System.out.println(executeCommand(command1));
}
private static String executeCommand(String command) throws IOException, InterruptedException {
int exitCode = 0;
String result = "";
Process process;
ProcessBuilder builder = new ProcessBuilder(command.replaceAll("[ ]+", " ").split(" "));
builder.directory(new File("/tmp/test"));
process = builder.start();
exitCode = process.waitFor();
return getStringFromInputStream(process.getInputStream());
}
private static String getStringFromInputStream(InputStream is) {
BufferedReader br = null;
StringBuilder sb = new StringBuilder();
String line;
try {
br = new BufferedReader(new InputStreamReader(is));
while ((line = br.readLine()) != null) {
sb.append(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return sb.toString();
}
}
的command1
和command2
是除了Youbute播放列表参数是相同的。 command2
中的播放列表中有409个视频,并且在command1
中有200个视频。我可以在终端中成功获得两个命令的结果。只是command2
需要更多的时间,但只有几秒钟。但是当我运行Main.java
(javac Main.java; java Main)时,对于command1
,它会成功打印结果,但对于command2
,它在那里挂起几分钟而没有任何结果。这里是jstack
这个过程
"main" #1 prio=5 os_prio=0 tid=0x00007f828c009800 nid=0xce7 in Object.wait() [0x00007f8293cf7000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x0000000771df9fe0> (a java.lang.UNIXProcess)
at java.lang.Object.wait(Object.java:502)
at java.lang.UNIXProcess.waitFor(UNIXProcess.java:396)
- locked <0x0000000771df9fe0> (a java.lang.UNIXProcess)
at Main.executeCommand(Main.java:18)
at Main.main(Main.java:8)
它挂在exitCode = process.waitFor();
。我不知道这件事。谁能帮我?非常感谢。
您是否尝试过在您的IDE中添加几个断点并在执行代码时逐步查看它挂起的位置? –
@KevinHooke我挂在exitCode = process.waitFor();我只是更新了问题并添加了jstack。 – user2256235
设置一个断点并将解析后的命令行(全部替换之后)在shell中运行,看看是否有效。也许最后的命令在代码中呈现错误。 – zuckermanori