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我試圖在java程序中處理從diff的運行得到的數據到GNU grep的一個實例。我設法使用Process對象的outputStream獲取diff的輸出，但是我目前正在將程序發送給grep的標準輸入（通過另一個用Java創建的Process對象）。使用輸入運行Grep只會返回狀態碼1.我做錯了什麼？將數據寫入java中調用的grep程序的InputStream中
下面是我到目前爲止的代碼：要比較
public class TestDiff {
final static String diffpath = "/usr/bin/";
public static void diffFiles(File leftFile, File rightFile) {
Runtime runtime = Runtime.getRuntime();
File tmp = File.createTempFile("dnc_uemo_", null);
String leftPath = leftFile.getCanonicalPath();
String rightPath = rightFile.getCanonicalPath();
Process proc = runtime.exec(diffpath+"diff -n "+leftPath+" "+rightPath, null);
InputStream inStream = proc.getInputStream();
try {
proc.waitFor();
} catch (InterruptedException ex) {
}
byte[] buf = new byte[256];
OutputStream tmpOutStream = new FileOutputStream(tmp);
int numbytes = 0;
while ((numbytes = inStream.read(buf, 0, 256)) != -1) {
tmpOutStream.write(buf, 0, numbytes);
}
String tmps = new String(buf,"US-ASCII");
inStream.close();
tmpOutStream.close();
FileInputStream tmpInputStream = new FileInputStream(tmp);
Process addProc = runtime.exec(diffpath+"grep \"^a\" -", null);
OutputStream addProcOutStream = addProc.getOutputStream();
numbytes = 0;
while ((numbytes = tmpInputStream.read(buf, 0, 256)) != -1) {
addProcOutStream.write(buf, 0, numbytes);
addProcOutStream.flush();
}
tmpInputStream.close();
addProcOutStream.close();
try {
addProc.waitFor();
} catch (InterruptedException ex) {
}
int exitcode = addProc.exitValue();
System.out.println(exitcode);
inStream = addProc.getInputStream();
InputStreamReader sr = new InputStreamReader(inStream);
BufferedReader br = new BufferedReader(sr);
String line = null;
int numInsertions = 0;
while ((line = br.readLine()) != null) {
String[] p = line.split(" ");
numInsertions += Integer.parseInt(p[1]);
}
br.close();
}
}
兩個leftPath和rightPath是指向文件的File對象。