java PDF 转二进制字符串

哪路大神可以给个PDF转二进制字符串的例子，不要网上随便找的，谢谢

顺手给你写一个，不谢
public static byte[] getFileBytes(String 路径){
ArrayList bytesList = new ArrayList();
byte[] bytes = new byte[1];
FileInputStream inStream = null;
try{
inStream = new FileInputStream(路径);
while(inStream.read(__1bytes)>0){
bytesList.add(__1bytes[0]);
}
bytes = new byte[bytesList.size()];
for(int i;i<bytes.length;i++){
bytes[i] = bytesList.get(i);
}

    return bytes;
}catch(Exception e){
    e.printStackTrace();
    throw e;
}finally{
    try{
        if(inStream!=null){
            inStream.close();
        }
    }catch(Exception e){
        e.printStackTrace();
    }
}

}

你不要16进制的么，接着写，精彩来了，效率和可读性平衡一下，效率再高代码就多了不好维护，自己看,你要字符串就把得到的byte[]给toString一下，你要写到文件里就直接write字节
byte[] getHexBytes(byte[] bytes){
byte[] newBytes = new byte[4*bytes.length]
byte[] 0xbytes = new byte[]{(int)'0',(int)'x',(int)'0',(int)'0'};
for(int i=0;i<bytes.length;i++){
System.arraycopy(0xbytes,0,newBytes,i*4,4);
char[] hexChars = Integer.toHexString((int)bytes[i]).toCharArray();
for(int j=0;j<hexChars.length;j++){
newBytes[i*4+4-hexChars.length+j] = (int)hexChars[j];
}
}
return newBytes;
}

    public static void readFileByBytes(String fileName) {  
    File file = new File(fileName);  
    InputStream in = null;  
    try {  

        in = new FileInputStream(file);  
        int tempbyte;  
        while ((tempbyte = in.read()) != -1) {  
            System.out.println(String.format("0x%02x",tempbyte));  
        }  
        in.close();  
    } catch (IOException e) {  
        e.printStackTrace();  
        return;  
    }  
}