public static String getImgStr(String imgFile){ //将图片文件转化为字节数组字符串，并对其进行Base64编码处理 InputStream in = null; byte[] data = null; //读取图片字节数组 try { in = new FileInputStream(imgFile); data = new byte[in.available()]; in.read(data); in.close(); } catch (IOException e) { e.printStackTrace(); } return new String(Base64.encodeBase64(data)); }
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利用以上的思路写的一个测试
public class ReadImageTest { public static void main(String[] args) throws IOException { FileInputStream fis = new FileInputStream(new File("C://Users//luzhifei//Pictures//hc_logo.png")); String picStr=""; byte[] read = null; int len = 0; read= new byte[fis.available()]; fis.read(read); String baseStr= Base64.getEncoder().encodeToString(read); //System.out.println( baseStr); byte[] op= Base64.getDecoder().decode(baseStr); // System.out.println(new String(op)); FileOutputStream fos = new FileOutputStream(new File("d://temp//1.jpg")); fos.write(op,0,op.length ); fos.flush(); fos.close(); }}
但是available()有一定的限制。
为了稳妥，严重建议采取以下方式：
public static void imageToBase64Str() throws IOException{ FileInputStream fis = new FileInputStream(new File("C://Users//luzhifei//Pictures//hc_logo.png")); byte[] read = new byte[1024]; int len = 0; List<byte[]> blist=new ArrayList<byte[]>(); int ttllen=0; while((len = fis.read(read))!= -1){ byte[] dst=new byte[len]; System.arraycopy(read, 0, dst, 0, len); ttllen+=len; blist.add(dst); } fis.close(); byte[] dstByte=new byte[ttllen]; int pos=0; for (int i=0;i<blist.size();i++){ if (i==0){ pos=0; } else{ pos+=blist.get(i-1).length; } System.arraycopy(blist.get(i), 0, dstByte, pos, blist.get(i).length); } String baseStr= Base64.getEncoder().encodeToString(dstByte); byte[] op= Base64.getDecoder().decode(baseStr); FileOutputStream fos = new FileOutputStream(new File("d://temp//2.jpg")); fos.write(op,0,op.length ); fos.flush(); fos.close(); }
