字节类型的数据转换为16进制的字符串

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/***将字节类型数据转换为16进制的字符串，参考《Think in Java》*/import java.io.FileInputStream;import java.io.File;public class Hex{/**字节类型的数据转换为16进制的字符串*/public static String byteToHex(byte[] data){StringBuilder result = new StringBuilder();int n = 0;for(byte b:data){if(n%16==0)result.append(String.format("%05X: ",n)); //添加行号result.append(String.format("%02X ",b)); //格式化为16进制n++;if(n%16==0) result.append("/n"); //换行，每16个数字为一行}result.append("/n");return result.toString();}/**读取文件数据*/private static byte[] read(String pathName) throws Exception{File file = new File(pathName);FileInputStream in = new FileInputStream(file);byte[] data = new byte[in.available()];in.read(data);in.close();return data;}/**测试*/public static void main(String[] args) throws Exception{if(args.length==0)System.out.println(byteToHex(read("Hex.class")));elseSystem.out.println(byteToHex(read(args[0])));}}