public static void main(String[] args) throws IOException {
File file1 = new File("d:" + File.separator + "hello1.txt");
File file2 = new File("d:" + File.separator + "hello2.txt");
File file3 = new File("d:" + File.separator + "hello.txt");
InputStream input1 = new FileInputStream(file1);
InputStream input2 = new FileInputStream(file2);
OutputStream output = new FileOutputStream(file3);
// 合并流
SequenceInputStream sis = new SequenceInputStream(input1, input2);
int temp = 0;
while ((temp = sis.read()) != -1) {
output.write(temp);
}
input1.close();
input2.close();
output.close();
sis.close();
}
public static void mergeFile_2(File dir) throws IOException {
/*
* 获取指定目录下的配置文件对象。
*/
File[] files = dir.listFiles(new SuffixFilter(".properties"));
if (files.length != 1) throw new RuntimeException(dir + ",该目录下没有properties扩展名的文件或者不唯一");
// 记录配置文件对象。
File confile = files[0];
// 获取该文件中的信息。================================================
FileInputStream fis = new FileInputStream(confile);
Properties prop = new Properties();
prop.load(fis);
String filename = prop.getProperty("filename");
int count = Integer.parseInt(prop.getProperty("partcount"));
// 获取该目录下的所有碎片文件。 ==============================================
File[] partfiles = dir.listFiles(new SuffixFilter(".part"));
if (partfiles.length != (count - 1))
throw new RuntimeException("碎片文件不符合要求，个数不对!应该" + count + "个");
// 将碎片文件和流对象关联 并存储到集合中。
ArrayList<FileInputStream> al = new ArrayList<FileInputStream>();
for (int x = 0; x < partfiles.length; x++) {
al.add(new FileInputStream(partfiles[x]));
}
// 将多个流合并成一个序列流。
Enumeration<FileInputStream> en = Collections.enumeration(al);
SequenceInputStream sis = new SequenceInputStream(en);
FileOutputStream fos = new FileOutputStream(new File(dir, filename));
byte[] buf = new byte[1024];
int len = 0;
while ((len = sis.read(buf)) != -1) {
fos.write(buf, 0, len);
}
fos.close();
sis.close();
}
public static void mergeFile(File dir) throws IOException {
ArrayList<FileInputStream> al = new ArrayList<FileInputStream>();
for (int x = 1; x <= 3; x++) {
al.add(new FileInputStream(new File(dir, x + ".part")));
}
Enumeration<FileInputStream> en = Collections.enumeration(al);
SequenceInputStream sis = new SequenceInputStream(en);
FileOutputStream fos = new FileOutputStream(new File(dir, "1.bmp"));
byte[] buf = new byte[1024];
int len = 0;
while ((len = sis.read(buf)) != -1) {
fos.write(buf, 0, len);
}
fos.close();
sis.close();
}
/**
* Uses the given {@link net.i2p.data.SigningPrivateKey} to sign the given input file along with
* its version string using DSA. The output will be a signed update file where the first 40 bytes
* are the resulting DSA signature, the next 16 bytes are the input file's version string encoded
* in UTF-8 (padded with trailing <code>0h</code> characters if necessary), and the remaining
* bytes are the raw bytes of the input file.
*
* @param inputFile The file to be signed.
* @param signedFile The signed update file to write.
* @param signingPrivateKey An instance of <code>SigningPrivateKey</code> to sign <code>inputFile
* </code> with.
* @param version The version string of the input file. If this is longer than 16 characters it
* will be truncated.
* @return An instance of {@link net.i2p.data.Signature}, or <code>null</code> if there was an
* error.
*/
public Signature sign(
String inputFile, String signedFile, SigningPrivateKey signingPrivateKey, String version) {
byte[] versionHeader = {
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
};
byte[] versionRawBytes = null;
if (version.length() > VERSION_BYTES) version = version.substring(0, VERSION_BYTES);
try {
versionRawBytes = version.getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("wtf, your JVM doesnt support utf-8? " + e.getMessage());
}
System.arraycopy(versionRawBytes, 0, versionHeader, 0, versionRawBytes.length);
FileInputStream fileInputStream = null;
Signature signature = null;
SequenceInputStream bytesToSignInputStream = null;
ByteArrayInputStream versionHeaderInputStream = null;
try {
fileInputStream = new FileInputStream(inputFile);
versionHeaderInputStream = new ByteArrayInputStream(versionHeader);
bytesToSignInputStream = new SequenceInputStream(versionHeaderInputStream, fileInputStream);
signature = _context.dsa().sign(bytesToSignInputStream, signingPrivateKey);
} catch (Exception e) {
if (_log.shouldLog(Log.ERROR)) _log.error("Error signing", e);
return null;
} finally {
if (bytesToSignInputStream != null)
try {
bytesToSignInputStream.close();
} catch (IOException ioe) {
}
fileInputStream = null;
}
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = new FileOutputStream(signedFile);
fileOutputStream.write(signature.getData());
fileOutputStream.write(versionHeader);
fileInputStream = new FileInputStream(inputFile);
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = fileInputStream.read(buffer)) != -1)
fileOutputStream.write(buffer, 0, bytesRead);
fileOutputStream.close();
} catch (IOException ioe) {
if (_log.shouldLog(Log.WARN))
_log.log(Log.WARN, "Error writing signed file " + signedFile, ioe);
return null;
} finally {
if (fileInputStream != null)
try {
fileInputStream.close();
} catch (IOException ioe) {
}
if (fileOutputStream != null)
try {
fileOutputStream.close();
} catch (IOException ioe) {
}
}
return signature;
}