圖片和base64編碼字符串 互相轉換,圖片和byte數組互相轉換
阿新 • • 發佈:2017-05-06
16進制 cnblogs exc 十六進制 tostring ati color int inpu
圖片和base64編碼字符串 互相轉換
import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; import java.io.*; /** * @author lishupeng * @create 2017-05-06 下午 2:56 **/ public class Base64Test { public static void main(String[] args) { String strImg = GetImageStr(); System.out.println(strImg); GenerateImage(strImg); }//圖片轉化成base64字符串 public static String GetImageStr() {//將圖片文件轉化為字節數組字符串,並對其進行Base64編碼處理 String imgFile = "C:\\Users\\Administrator\\Desktop\\a\\1.png";//待處理的圖片 InputStream in = null; byte[] data = null; //讀取圖片字節數組 try { in = new FileInputStream(imgFile); data= new byte[in.available()]; in.read(data); in.close(); } catch (IOException e) { e.printStackTrace(); } //對字節數組Base64編碼 BASE64Encoder encoder = new BASE64Encoder(); return encoder.encode(data);//返回Base64編碼過的字節數組字符串 } //base64字符串轉化成圖片public static boolean GenerateImage(String imgStr) { //對字節數組字符串進行Base64解碼並生成圖片 if (imgStr == null) //圖像數據為空 return false; BASE64Decoder decoder = new BASE64Decoder(); try { //Base64解碼 byte[] b = decoder.decodeBuffer(imgStr); for (int i = 0; i < b.length; ++i) { if (b[i] < 0) {//調整異常數據 b[i] += 256; } } //生成jpeg圖片 String imgFilePath = "d://222.jpg";//新生成的圖片 OutputStream out = new FileOutputStream(imgFilePath); out.write(b); out.flush(); out.close(); return true; } catch (Exception e) { return false; } }
圖片和byte數組互相轉換
import javax.imageio.stream.FileImageInputStream; import javax.imageio.stream.FileImageOutputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; /** * @author lishupeng * @create 2017-05-06 下午 3:48 **/ public class Image2Byte { public static void main(String[] args){ byte[] data = image2byte("C:\\Users\\Administrator\\Desktop\\a\\1.png"); System.out.println(data.toString()); byte2image(data,"d://222.jpg"); } //圖片到byte數組 public static byte[] image2byte(String path) { byte[] data = null; FileImageInputStream input = null; try { input = new FileImageInputStream(new File(path)); ByteArrayOutputStream output = new ByteArrayOutputStream(); byte[] buf = new byte[1024]; int numBytesRead = 0; while ((numBytesRead = input.read(buf)) != -1) { output.write(buf, 0, numBytesRead); } data = output.toByteArray(); output.close(); input.close(); } catch (FileNotFoundException ex1) { ex1.printStackTrace(); } catch (IOException ex1) { ex1.printStackTrace(); } return data; } //byte數組到圖片 public static void byte2image(byte[] data, String path) { if (data.length < 3 || path.equals("")) return; try { FileImageOutputStream imageOutput = new FileImageOutputStream(new File(path)); imageOutput.write(data, 0, data.length); imageOutput.close(); System.out.println("Make Picture success,Please find image in " + path); } catch (Exception ex) { System.out.println("Exception: " + ex); ex.printStackTrace(); } } //byte數組到16進制字符串 public String byte2string(byte[] data) { if (data == null || data.length <= 1) return "0x"; if (data.length > 200000) return "0x"; StringBuffer sb = new StringBuffer(); int buf[] = new int[data.length]; //byte數組轉化成十進制 for (int k = 0; k < data.length; k++) { buf[k] = data[k] < 0 ? (data[k] + 256) : (data[k]); } //十進制轉化成十六進制 for (int k = 0; k < buf.length; k++) { if (buf[k] < 16) sb.append("0" + Integer.toHexString(buf[k])); else sb.append(Integer.toHexString(buf[k])); } return "0x" + sb.toString().toUpperCase(); } }
圖片和base64編碼字符串 互相轉換,圖片和byte數組互相轉換