本地图片与网络图片转base64

Posted 2021-08-31 xiejunna

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"));
	}
}