Java图片上传Base64 类型上传 后台转换工具类

java图片上传Base64 类型上传 后台转换工具类

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.springframework.web.multipart.MultipartFile;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class BASE64DecodedMultipartFile implements MultipartFile {

	 private final byte[] imgContent;
	    private final String header;

	    public BASE64DecodedMultipartFile(byte[] imgContent, String header) {
	        this.imgContent = imgContent;
	        this.header = header.split(";")[0];
	    }

	    @Override
	    public String getName() {
	        // TODO - implementation depends on your requirements
	        return System.currentTimeMillis() + Math.random() + "." + header.split("/")[1];
	    }

	    @Override
	    public String getOriginalFilename() {
	        // TODO - implementation depends on your requirements
	        return System.currentTimeMillis() + (int)Math.random() * 10000 + "." + header.split("/")[1];
	    }

	    @Override
	    public String getContentType() {
	        // TODO - implementation depends on your requirements
	        return header.split(":")[1];
	    }

	    @Override
	    public boolean isEmpty() {
	        return imgContent == null || imgContent.length == 0;
	    }

	    @Override
	    public long getSize() {
	        return imgContent.length;
	    }

	    @Override
	    public byte[] getBytes() throws IOException {
	        return imgContent;
	    }

	    @Override
	    public InputStream getInputStream() throws IOException {
	        return new ByteArrayInputStream(imgContent);
	    }

	    @Override
	    public void transferTo(File dest) throws IOException, IllegalStateException {
	        new FileOutputStream(dest).write(imgContent);
	    }
	    
	    /**
	    *将图片Base64 码转成上传流
	    */
	    public static MultipartFile base64ToMultipart(String base64) {
	        try {
	            String[] baseStrs = base64.split(",");

	            BASE64Decoder decoder = new BASE64Decoder();
	            byte[] b = new byte[0];
	            b = decoder.decodeBuffer(baseStrs[1]);

	            for(int i = 0; i < b.length; ++i) {
	                if (b[i] < 0) {
	                    b[i] += 256;
	                }
	            }
	            return new BASE64DecodedMultipartFile(b, baseStrs[0]);
	        } catch (IOException e) {
	            e.printStackTrace();
	            return null;
	        }
	    }
	    
		//base64字符串转byte[]
		public static byte[] base64String2Byte(String base64Str) throws IOException{
			BASE64Decoder decoder = new BASE64Decoder();
			return decoder.decodeBuffer(base64Str);
		}
//		//byte[]转base64
		public static String byte2Base64String(byte[] b){
			BASE64Encoder encoder = new BASE64Encoder();
			return encoder.encode(b);
		}

}