將進程的輸出重定向到字符串？

Question

我正在嘗試將進程的輸出轉換為字符串，但是我遇到了一些問題。 我以某種方式設法將輸出保存在一個單獨的文件中（在stackoverflow.com上找到此處）。 這是我的代碼，可以啟動該過程：

    String javaHome = System.getProperty("java.home");

    String javaBin = javaHome + File.separator + "bin" + File.separator
            + "java";

    String classpath = System.getProperty("java.class.path");

    String className = klasse.getCanonicalName();
    ProcessBuilder builder = new ProcessBuilder(javaBin, "-cp", classpath,
            className, ip, port, team, "okay");

文件中的內容為：

     File log = new File("logfile_deleteable" + a);
     builder.redirectOutput(Redirect.appendTo(log));

     assert builder.redirectInput() == Redirect.PIPE;
     assert builder.redirectOutput().file() == log;
     assert process[a].getInputStream().read() == -1;

最后：

    process[a] = builder.start();

Answer 1

嘗試這個

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process[a].getInputStream()));
StringBuilder stringBuilder = new StringBuilder();
String line = null;
while ( (line = bufferedReader.readLine()) != null) {
   stringBuilder.append(line);
   stringBuilder.append(System.getProperty("line.separator"));
}
String output = stringBuilder.toString();