java使用Base64实现文件加密解密

package test.base64;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;/*** 服务器之间传递图片*/public class TestCase { public static void main(String[] args) {// 将图片文件转化为字节数组字符串，并对其进行Base64编码处理String strImg = GetImageStr();System.out.println(strImg);// 对字节数组字符串进行Base64解码并生成图片GenerateImage(strImg);}public static String GetImageStr() {String imgFile = "d://java.pdf";// 待处理的图片InputStream in = null;byte[] data = null;// 读取图片字节数组try {in = new FileInputStream(imgFile);data = new byte[in.available()];in.read(data);in.close();} catch (IOException e) {e.printStackTrace();}// 对字节数组Base64编码BASE64Encoder encoder = new BASE64Encoder();return encoder.encode(data);// 返回Base64编码过的字节数组字符串}public static boolean GenerateImage(String imgStr) {if (imgStr == null){ // 图像数据为空return false;}BASE64Decoder decoder = new BASE64Decoder();try {// Base64解码byte[] b = decoder.decodeBuffer(imgStr);for (int i = 0; i < b.length; ++i) {if (b[i] < 0) {// 调整异常数据b[i] += 256;}}// 生成jpg图片String imgFilePath = "d://new.pdf"; // 新生成的图片OutputStream out = new FileOutputStream(imgFilePath);out.write(b);out.flush();out.close();return true;} catch (Exception e) {return false;}}}

public class base64 {  public static void main(String[] args){    File file = new File("D://base64.txt");    String result = getFromBase64(file2String(file));    System.out.println(result);  }  //文件转字符串  public static String file2String(File file){    try {      BufferedReader buffer = new BufferedReader(new FileReader(file));      StringBuilder sb = new StringBuilder();      String temp;      while((temp = buffer.readLine()) !=null ){        sb.append(temp);      }      return sb.toString();    } catch (FileNotFoundException e) {      // TODO Auto-generated catch block      e.printStackTrace();      return null;    } catch (IOException e) {      // TODO Auto-generated catch block      e.printStackTrace();      return null;    }  }  //加密  public static String getBase64(String str){    byte[] b = null;    String s = null;    try {      b = str.getBytes("utf-8");    } catch (UnsupportedEncodingException e) {      e.printStackTrace();    }    if( b != null){       s = new BASE64Encoder().encode(b);    }    return s;  }  //解密  public static String getFromBase64(String str){    byte[] b = null;    String result = null;    if(str != null){       BASE64Decoder decoder = new BASE64Decoder();        try {           b = decoder.decodeBuffer(str);           result = new String(b, "utf-8");         } catch (Exception e) {           e.printStackTrace();         }     }    return result;  }}