1、文件的切割合并
public class SpliFileDemo { //创建1M的缓冲区 private static int SIZE=1048576; public static void main(String[] args) throws IOException { File file=new File("c://partfile"); // splitFile(file); mergeFile(file); } public static void splitFile(File file) throws IOException{ //用流读取文件 FileInputStream fis=new FileInputStream(file); //定义一个1M的缓冲区 byte[] buf=new byte[SIZE]; FileOutputStream fos=null; int len=0; int count=1; File dir=new File("c:\\partfile"); if (!dir.exists()) dir.mkdirs(); while ((len=fis.read(buf))!=-1){ fos=new FileOutputStream(new File(dir,(count++)+".part")); fos.write(buf,0,len); } fos.close(); fis.close(); } public static void mergeFile(File dir) throws IOException { ArrayList<FileInputStream> a1=new ArrayList<FileInputStream>(); for (int x=1;x<=7;x++) { a1.add(new FileInputStream(new File(dir, x + ".part"))); } Enumeration<FileInputStream> en=Collections.enumeration(a1); SequenceInputStream sis=new SequenceInputStream(en); FileOutputStream fos=new FileOutputStream(new File(dir,"sss1.pdf")); byte[] buf=new byte[1024*1024]; int len=0; while((len=sis.read(buf))!=-1){ fos.write(buf,0,len); } fos.close(); sis.close(); } }