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[英]Invoke postgres commands via Java Runtime.getruntime.exec()
[英]Interactive commands using java Runtime.getRunTime.exec()
如何使用Runtime.getRunTime.exec()發送和接收多個輸入。
例如,如果我想運行諸如openSSL之類的東西來生成一個csr,它將詢問諸如州,城市,公用名..之類的東西。
Process p = Runtime.getRuntime().exec(cmd);
OutputStream out = p.getOutputStream();
//print stuff p.getInputStream();
//Now i want to send some inputs
out.write("test".getBytes());
//flush and close??? don't know what to do here
//print what ever is returned
//Now i want to send some more inputs
out.write("test2".getBytes());
//print what ever is returned.. and so on until this is complete
為什么不使用p.getInputStream()來讀取需要發送的內容,而使用out.write()來相應地發送數據呢?
Process p = Runtime.getRuntime().exec(cmd);
OutputStream out = p.getOutputStream();
//print stuff p.getInputStream();
out.write("test".getBytes());
out.close(); //if i don't close, it will just sit there
//print stuff p.getInputStream();
out.write("test".getBytes()); // I can no longer write at this point, maybe because the outputstream was closed?
為什么不使用p.getInputStream().read()
來讀取需要發送的內容,而使用out.write()
來相應地發送數據呢?
這是一個取自以下示例: http : //www.rgagnon.com/javadetails/java-0014.html
String line;
OutputStream stdin = null;
InputStream stderr = null;
InputStream stdout = null;
// launch EXE and grab stdin/stdout and stderr
Process process = Runtime.getRuntime ().exec ("/folder/exec.exe");
stdin = process.getOutputStream ();
stderr = process.getErrorStream ();
stdout = process.getInputStream ();
// "write" the parms into stdin
line = "param1" + "\n";
stdin.write(line.getBytes() );
stdin.flush();
line = "param2" + "\n";
stdin.write(line.getBytes() );
stdin.flush();
line = "param3" + "\n";
stdin.write(line.getBytes() );
stdin.flush();
stdin.close();
// clean up if any output in stdout
BufferedReader brCleanUp =
new BufferedReader (new InputStreamReader (stdout));
while ((line = brCleanUp.readLine ()) != null) {
//System.out.println ("[Stdout] " + line);
}
brCleanUp.close();
// clean up if any output in stderr
brCleanUp =
new BufferedReader (new InputStreamReader (stderr));
while ((line = brCleanUp.readLine ()) != null) {
//System.out.println ("[Stderr] " + line);
}
brCleanUp.close();
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