java base64例子
import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import java.io.*;public class Base64Convert { BASE64Decoder decoder = new BASE64Decoder(); public static String ioToBase64() throws IOException { String fileName = "D:\\图片\\11.jpg"; //源文件 String strBase64 = null; try { InputStream in = new FileInputStream(fileName); // in.available()返回文件的字节长度 byte[] bytes = new byte[in.available()]; // 将文件中的内容读入到数组中 in.read(bytes); strBase64 = new BASE64Encoder().encode(bytes); //将字节流数组转换为字符串 System.out.println(strBase64); in.close(); } catch (FileNotFoundException fe) { fe.printStackTrace(); } catch (IOException ioe) { ioe.printStackTrace(); } return strBase64; } public static void base64ToIo(String strBase64) throws IOException { String string = strBase64; String fileName = "d:/gril2.gif"; //生成的新文件 try { // 解码，然后将字节转换为文件 byte[] bytes = new BASE64Decoder().decodeBuffer(string); //将字符串转换为byte数组 ByteArrayInputStream in = new ByteArrayInputStream(bytes); byte[] buffer = new byte[1024]; FileOutputStream out = new FileOutputStream(fileName); int bytesum = 0; int byteread = 0; while ((byteread = in.read(buffer)) != -1) { bytesum += byteread; out.write(buffer, 0, byteread); //文件写操作 } } catch (IOException ioe) { ioe.printStackTrace(); } } public static void main(String[] args){ try { String strBase64 = ioToBase64(); //将 io 转换为 base64编码 System.out.println(">>> "+strBase64); base64ToIo(strBase64); //将 base64编码转换为 io 文件流，生成一幅新图片 } catch (IOException e) { e.printStackTrace(); } }}