长串16进制数据字符串转换二级制

public static void main(String[] args) throws Exception {//  System.out.println(readTxt().replaceAll(" ", ""));String str = readTxt();int length = str.length() / 2;List list = new ArrayList();if (length * 2 < str.length()) {length++;}String[] strs = new String[length];int j = 0;for (int i = 0; i < str.length(); i++) {if (i % 2 == 0) {strs[j] = "" + str.charAt(i);} else {strs[j] = strs[j] + "" + str.charAt(i);j++;}}list.addAll(Arrays.asList(strs));OutputStream outputStream = new FileOutputStream(new File("d:/123.txt"));for (int i = 0; i < list.size(); i++) {int ii = Integer.valueOf(list.get(i).toString(), 16);String bin = Integer.toBinaryString(ii);bin += " " + bin + " " + bin + "\n";byte[] bytes = bin.getBytes();for (int k = 0; k < bytes.length; k++) {outputStream.write(bytes[k]);}}outputStream.close();}private static String readTxt() throws Exception {Reader inputStream = new FileReader("d:/image.txt");BufferedReader reader = new BufferedReader(inputStream);String str = "";StringBuilder builder = new StringBuilder();while ((str = reader.readLine()) != null) {builder.append(str);}return builder.toString();}

image.txt中存放十六进制数据，先将十六进制数据读取成字符串，后将字符串以每两个隔开构成16进制数，后将十六进制数转换成十进制，再将十进制转换成二进制数据，这样就完成了十六进制转换成二进制。