Java读取Oracle EXP命令输出
我需要通过 Java 程序运行 Oracle EXP 命令并在某处打印命令输出。
EXP 命令是正确的，当我执行 Java 代码时，转储文件已正确创建，但我在获取输出时遇到了一些问题。
这是一个与我用来读取输出的代码片段非常相似的代码片段：
String line;
String output = "";
try {
Process p = Runtime.getRuntime().exec(myCommand);
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((line = input.readLine()) != null) {
output += (line + '\n');
}
input.close();
}
catch (Exception ex) {
ex.printStackTrace();
}
System.out.println(output);
正如我所说，该命令已正确执行（通过生成的转储文件进行验证），但我的控制台上没有出现任何内容，并且我的 Java 程序不会终止任何一个。
如果我使用另一个命令，如“ls -l”而不是“exp ...”，相同的代码可以完美工作。
I need to run the Oracle EXP command through a Java program and print somewhere the command output.
The EXP command is correct, the dump file is created correctly when I execute my Java code, but I'm experiencing some issues to get the output.
This is an snippet very similar to the one I'm using to read the output:
String line;
String output = "";
try {
Process p = Runtime.getRuntime().exec(myCommand);
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((line = input.readLine()) != null) {
output += (line + '\n');
}
input.close();
}
catch (Exception ex) {
ex.printStackTrace();
}
System.out.println(output);
As I said, the command is correctly executed (verified through the generated dump file), but nothing appears on my console and my Java programs doesn't terminate either.
The same code works perfectly if I use another command, as "ls -l" instead of "exp ...".
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评论（2）
也许 exp 正在写入标准错误输出而不是标准输出。
尝试使用
p.getErrorStream()而不是getInputStream()Maybe exp is writing to standard error output rather than standard output.
Try to use
p.getErrorStream()instead ofgetInputStream()正如 a_horse_with_no_name 所说，可能是错误流缓冲区已满，因此阻塞了程序执行。
尝试启动一个
Thread来读取错误流，或者使用ProcessBuilder类将错误流重定向到stdout（您已经读取过）。As a_horse_with_no_name said, it might be that the error stream buffer is full and thus is blocking the programm execution.
Either try to start a
Threadto also read the error stream or use theProcessBuilderclass to redirect the error stream to stdout (which you already read).