的Java複製InputStream的一部分的OutputStream

Question

我有3236000個字節的文件，我想從開始讀2936000和寫入到OutputStream

InputStream is = new FileInputStream(file1); 
OutputStream os = new FileOutputStream(file2); 

AFunctionToCopy(is,os,0,2936000); /* a function or sourcecode to write input stream 0to2936000 bytes */ 

我可以讀取和字節寫字節，但它是慢（我認爲）從緩衝讀數 如何複製它？

Answer 1

public static void copyStream(InputStream input, OutputStream output, long start, long end) 
    throws IOException 
{ 
    for(int i = 0; i<start;i++) input.read(); // dispose of the unwanted bytes 
    byte[] buffer = new byte[1024]; // Adjust if you want 
    int bytesRead; 
    while ((bytesRead = input.read(buffer)) != -1 && bytesRead<=end) // test for EOF or end reached 
    { 
     output.write(buffer, 0, bytesRead); 
    } 
} 

應該爲你工作。