我需要从Java执行一个批处理脚本,它遵循
1)一旦启动它就会执行一个冗长的(最多几秒)任务。
2)此后,它会显示提示“密码:”。
3)然后,用户输入密码并按Enter键。
4)然后,脚本完成其工作。
我知道如何从Java启动脚本,我知道如何在Java中读取批处理脚本的输出,但我不知道如何等待密码提示出现(我如何知道批处理脚本正在等待密码输入。)
所以,我的问题是:如何知道批处理脚本何时打印了提示?
目前,我有以下代码:
final Runtime runtime = Runtime.getRuntime();
final String command = ... ;
final Process proc = runtime.exec(command, null, this.parentDirectory);
final BufferedReader input = new BufferedReader(new InputStreamReader(
proc.getInputStream()));
String line = null;
while ((line = input.readLine()) != null) {
LOGGER.debug("proc: " + line);
}
答案 0 :(得分:3)
那应该做的工作:
public static void main(final String... args) throws IOException, InterruptedException {
final Runtime runtime = Runtime.getRuntime();
final String command = "..."; // cmd.exe
final Process proc = runtime.exec(command, null, new File("."));
final BufferedReader input = new BufferedReader(new InputStreamReader(proc.getInputStream()));
StringBuilder sb = new StringBuilder();
char[] cbuf = new char[100];
while (input.read(cbuf) != -1) {
sb.append(cbuf);
if (sb.toString().contains("Password:")) {
break;
}
Thread.sleep(1000);
}
System.out.println(sb);
}
答案 1 :(得分:2)
这个似乎有效:
@Override
public void run() throws IOException, InterruptedException {
final Runtime runtime = Runtime.getRuntime();
final String command = ...;
final Process proc = runtime.exec(command, null, this.parentDirectory);
final BufferedReader input = new BufferedReader(new InputStreamReader(
proc.getInputStream()));
String batchFileOutput = "";
while (input.ready()) {
char character = (char) input.read();
batchFileOutput = batchFileOutput + character;
}
// Batch script has printed the banner
// Wait for the password prompt
while (!input.ready()) {
Thread.sleep(1000);
}
// The password prompt isn't terminated by a newline - that's why we can't use readLine.
// Instead, we need to read the stuff character by character.
batchFileOutput = "";
while (input.ready() && (!batchFileOutput.endsWith("Password: "))) {
char character = (char) input.read();
batchFileOutput = batchFileOutput + character;
}
// When we are here, the prompt has been printed
// It's time to enter the password
if (batchFileOutput.endsWith("Password: ")) {
final BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(proc.getOutputStream()));
writer.write(this.password);
// Simulate pressing of the Enter key
writer.newLine();
// Flush the stream, otherwise it doesn't work
writer.flush();
}
// Now print out the output of the batch script AFTER we have provided it with a password
String line;
while ((line = input.readLine()) != null) {
LOGGER.debug("proc: " + line);
}
// Print out the stuff on stderr, if the batch script has written something into it
final BufferedReader error = new BufferedReader(new InputStreamReader(
proc.getErrorStream()));
String errorLine = null;
while ((errorLine = error.readLine()) != null) {
LOGGER.debug("proc2: " + errorLine);
}
// Wait until the program has completed
final int result = proc.waitFor();
// Log the result
LOGGER.debug("result: " + result);
}