本地图片与网络图片转base64

亦凉 2022-09-02 15:49 212阅读 0赞

package com.test.utils;
    
    import java.io.ByteArrayOutputStream;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.InputStream;
    import java.net.HttpURLConnection;
    import java.net.URL;
    import org.apache.commons.codec.binary.Base64;
    
    public class ImageToBase64Utils { 
    	/** * http图片 转base64字符串 * @param imageUrl 超链接 * @return */
        public static String getBase64ByURLImage(String imageUrl) { 
            String base64Str = "";
            try { 
                //创建URL对象
                URL url = new URL(imageUrl);
                //打开链接
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                //设置请求方式为"GET"
                conn.setRequestMethod("GET");
                //超时5秒
                conn.setConnectTimeout(5 * 1000);
                //通过流获取图片数据
                InputStream inStream = conn.getInputStream();
                //流转byte
                byte[] data = getInputStream(inStream);
                Base64 base64 = new Base64();
                //byte转base64
                base64Str = base64.encodeToString(data);
            } catch (Exception e) { 
                e.printStackTrace();
            }
            return base64Str;
        }
        
        private static byte[] getInputStream(InputStream inStream) throws Exception { 
            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
            //创建Buffer字符串
            byte[] buffer = new byte[1024];
            //每次读取的字符串长度，如果为-1，全部读取完毕
            int len = 0;
            //用输入流从buffer里把数据读取出来
            while ((len = inStream.read(buffer)) != -1) { 
                //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
                outStream.write(buffer, 0, len);
            }
            //关闭输入流
            inStream.close();
            //把outStream里的数据写入内存
            return outStream.toByteArray();
        }
    
        
    
    	/** * 从磁盘路径的图片转Base64 */
    	public static String getBase64StrByLocalImage(String fileFullName) { 
    		if (fileFullName == null) { 
    			return null;
    		}
    		try { 
    			FileInputStream fileInputStream = new FileInputStream(new File(fileFullName));
    			ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(1000);
    			byte[] b = new byte[1000];
    			for (int n; (n = fileInputStream.read(b)) != -1;) { 
    				byteArrayOutputStream.write(b, 0, n);
    			}
    			fileInputStream.close();
    			byteArrayOutputStream.close();
    			byte[] bytes = byteArrayOutputStream.toByteArray();
    			Base64 base64 = new Base64();
    		    return base64.encodeToString(bytes);
    		} catch (Exception e) { 
    			e.printStackTrace();
    		}
    		return null;
    	}
        
        public static void main(String[] args) { 
    		//System.out.println(getBase64ByURLImage("https://www.baidu.com/photo/40112/9407.jpg"));
    		System.out.println(getBase64StrByLocalImage("F:\\E\\image\\zhongtai\\txqw.jpg"));
    	}
    }