[100分]怎么将图片转换成16进制字符串？？？

Question

从图片拿到byte[],然后调用byte[]转16进制字符的方法就行了
private static String byte2hex(byte[] b) {
         String hs = "";
         String stmp = "";
         for (int n = 0; n < b.length; n++) {
             stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
             if (stmp.length() == 1) {
                 hs = hs + "0" + stmp;
             } else {
                 hs = hs + stmp;
             }
         }
         return hs.toUpperCase();
     }

Answer 1

首先你要获得图片的byte，然后通过如下方法：  byte[]b=new byte[]{127,99,98};
 String hex="0123456789abcdef";
 String r="";
 for (int i = 0; i < b.length; i++) {
r+=String.valueOf( hex.charAt((b[i]>>4)&0xf))+
String.valueOf( hex.charAt((b[i]>>0)&0xf));
 }
 System.out.println(r);其中的b变量是你需要转换的突破字节

Answer 2

public static void main(String []args) throws Exception{
DataInputStream in = new DataInputStream(new FileInputStream("C:/Users/Public/Pictures/Sample Pictures/Autumn Leaves.jpg"));
PrintStream out = new PrintStream(new FileOutputStream("d:/img.txt"));
while(in.available() > 0){
out.printf("%x", in.read());
}
out.close();
in.close();

}

Answer 3

public static void main(String[] args) throws Exception {
FileInputStream fileInputStream = new FileInputStream(new File("test.png"));
FileChannel fileChannel = fileInputStream.getChannel();

ByteBuffer buffer = ByteBuffer.allocate(1024);
StringBuffer sb = new StringBuffer();
while(fileChannel.read(buffer)!=-1){
buffer.flip();
while(buffer.hasRemaining()){
sb.append(Integer.toHexString(buffer.get()));
}
buffer.clear();
}
System.out.print(sb.toString().toUpperCase());
fileChannel.close();
fileInputStream.close();
}

Answer 4

一个例子：package test;import java.io.File;
import java.io.IOException;import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.SAXException;public class Dom{    public static void main(String[] args) {
        try {
            File file = new File("D:\\dom.xml");
            DocumentBuilderFactory dobf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dobf.newDocumentBuilder();
            Document dc=db.parse(file);
            NodeList ndl=dc.getElementsByTagName("VALUE");
            for(int i=0;i<ndl.getLength();i++){
                String noum=dc.getElementsByTagName("NO").item(i).getTextContent();
                System.out.println(noum);
                String add=dc.getElementsByTagName("ADDR").item(i).getTextContent();
                System.out.println(add);
            }
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }catch(SAXException e){
            e.printStackTrace();
        }catch(IOException e){
            e.printStackTrace();
        }
    }
}
<?xml version="1.0" encoding="UTF-8"?> 
<RESULT>
<VALUE> 
<NO>A1234</NO>
<ADDR>深圳XX</ADDR>
</VALUE>
<VALUE> 
<NO>B1234</NO> 
<ADDR>珠海XXX</ADDR>
</VALUE>
</RESULT>

Answer 5

不小心搜了个在线转换的...
  哈哈http://dancewithnet.com/lab/2009/data-uri-mhtml/create.php