Java图片上传Base64 类型上传后台转换工具类

系统管理员 2022-02-28 06:36 272阅读 0赞

## 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);
    		}
    
    }