使用InputStream和OutputStream将多个文件写入到同一个文件中

清疚 2021-09-25 07:12 452阅读 0赞

**废话不多说,直接上代码.**

public static void main(String[] args) throws Exception{ 
            File oneTxT = new File("D:\\SensitiveWord.txt");
            File twoTxT = new File("D:\\SensitiveWord.txt");
            File ThreeTxT = new File("D:\\sql.txt");
            File resultTxT = new File("D:\\result.txt");
            InputStream i1 = new FileInputStream(oneTxT);
            InputStream i2 = new FileInputStream(twoTxT);
            InputStream i3 = new FileInputStream(ThreeTxT);
            List<InputStream> list = new ArrayList<InputStream>();
            list.add(i1);
            list.add(i2);
            list.add(i3);
            //拼接数据流
            InputStream result = makeInputStream2(list);
            OutputStream ops = new FileOutputStream(resultTxT);
            byte[] b = new byte[3200];
            int len;
            while ((len = result.read(b)) > 0) { 
                ops.write(b,0,len);
            }
            ops.flush();
            ops.close();
        }
        //将读取到的每一个文件流拼接成一个大的流.
    public static InputStream makeInputStream2(List<InputStream> list) throws IOException { 
            Vector<InputStream> v = new Vector<InputStream>();
            for (InputStream inputStream : list) { 
                v.add(inputStream);
            }
            Enumeration<InputStream> en = v.elements();
            SequenceInputStream sis = new SequenceInputStream(en);
            return sis;
        }