<span style="font-size:14px;">public class MergeFile {
public static void main(String[] args) throws IOException {
File dir = new File("c:\\partfiles");
mergeFile_2(dir);
}
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================================================。
Properties prop = new Properties();
FileInputStream fis = new FileInputStream(confile);
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();
}
}</span><strong style="color: rgb(153, 0, 0); font-size: 18px;">
</strong>
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