Java实现文件和base64流的相互转换功能示例

import java.io.FileInputStream;
import java.io.FileOutputStream;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
 * 文件与base64的互相转换操作
 */
public class testFile {
public static void main(String[] args) {
testFile t = new testFile();
try {
String ret = t.encodeBase64File("d://IE和火狐js或css差异.docx");
System.err.println(ret);
t.decoderBase64File(ret, "d://ghsTest/retFile.docx", "d://ghsTest/");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
   * 将文件转成base64 字符串
   *
   * @param path文件路径
   * @return *
   * @throws Exception
   */
  public static String encodeBase64File(String path) throws Exception {
    File file = new File(path);
    FileInputStream inputFile = new FileInputStream(file);
    byte[] buffer = new byte[(int) file.length()];
    inputFile.read(buffer);
    inputFile.close();
    return new BASE64Encoder().encode(buffer);
  }
  /**
   * 将base64字符解码保存文件
   *
   * @param base64Code
   * @param targetPath
   * @throws Exception
   */
  public static void decoderBase64File(String base64Code, String targetPath,String catalogue)
      throws Exception {
  File file = new File(catalogue);
  if(file.exists()==false){
  file.mkdirs();
  }
    byte[] buffer = new BASE64Decoder().decodeBuffer(base64Code);
    FileOutputStream out = new FileOutputStream(targetPath);
    out.write(buffer);
    out.close();
  }
}