二进制字符转成pdf

/**
* @Description:Base64转换成pdf
* @param pdfBase64St 二进制字符串r
* @param filepath 保存路径
*/
public static void BasetoPdffile(String pdfBase64Str,String filepath){
BufferedInputStream bis = null;
FileOutputStream fos = null;
BufferedOutputStream bos = null;
try{
byte[] bytes=Base64.decode(pdfBase64Str);
ByteArrayInputStream byteArrayInputStream=new ByteArrayInputStream(bytes);
bis=new BufferedInputStream(byteArrayInputStream);
File file=new File(filepath);
File path=file.getParentFile();
if(!path.exists()){
path.mkdirs();
}
fos=new FileOutputStream(file);
bos=new BufferedOutputStream(fos);

byte[] buffer=new byte[1024];
int length=bis.read(buffer);
while(length!=-1){
bos.write(buffer,0,length);
length=bis.read(buffer);
}
bos.flush();
}catch(Exception e){
e.printStackTrace();
}finally {
try{
bis.close();
bos.close();
fos.close();
}catch (IOException e){
e.printStackTrace();
}
}
}

public static void main(String[] args) {

String pdf_data="####";
String fileName="&&&&&";
BasetoPdffile(pdf_data,"D:\新建文件夹\PDF文件\"+fileName);
}