package com.example.demo.utils;
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import org.apache.commons.codec.binary.Base64;
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import java.io.*;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.util.Objects;
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public class ImageToBase64Utils {
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private static String strNetImageToBase64;
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private static String strLocalImageToBase64;
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public static void main(String[] args) {
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//第一个:把网络图片装换成Base64
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String netImagePath = "http://sfm-passimg.oss-cn-shenzhen.aliyuncs.com/2005231240367755.jpg?Expires=4745882436&OSSAccessKeyId=LTAIIux1rFeEycax&Signature=c8LhNXaw951X2kyweGl2EB9wyNc%3D";
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//下面是网络图片转换Base64的方法
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String imageToBase64 =NetImageToBase64(netImagePath);
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//下面是本地图片转换Base64的方法
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// String imagePath = "C:\\Users\\Administrator\\IdeaProjects\\testdemo\\src\\main\\resources\\static\\testPictrue.jpg";
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// String imageToBase64 = LocalImageToBase64(imagePath);
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GenerateImage(imageToBase64,"D:\\test.jpg");
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// System.out.println(imageToBase64);
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}
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/**
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* 网络图片转换Base64的方法
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*
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* @param netImagePath
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*/
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public static String NetImageToBase64(String netImagePath) {
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final ByteArrayOutputStream data = new ByteArrayOutputStream();
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try {
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// 创建URL
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URL url = new URL(netImagePath);
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final byte[] by = new byte[1024];
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// 创建链接
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final HttpURLConnection conn = (HttpURLConnection) url.openConnection();
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conn.setRequestMethod("GET");
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conn.setConnectTimeout(5000);
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InputStream is = conn.getInputStream();
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// 将内容读取内存中
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int len = -1;
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while ((len = is.read(by)) != -1) {
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data.write(by, 0, len);
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}
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// 对字节数组Base64编码
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strNetImageToBase64 = new String(Base64.encodeBase64(data.toByteArray()));
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// System.out.println("网络图片转换Base64:" + strNetImageToBase64);
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// 关闭流
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is.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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return strNetImageToBase64;
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}
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/**
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* 本地图片转换Base64的方法
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*
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* @param imgPath
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* @return
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*/
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public static String LocalImageToBase64(String imgPath) {
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byte[] data = null;
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// 读取图片字节数组
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try {
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InputStream in = new FileInputStream(imgPath);
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data = new byte[in.available()];
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in.read(data);
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in.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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// 返回Base64编码过的字节数组字符串
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strLocalImageToBase64 = new String(Base64.encodeBase64(Objects.requireNonNull(data)));
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return strLocalImageToBase64;
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}
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/**
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* base64转图片
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* @param base64str base64码
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* @param savePath 图片路径
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* @return
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*/
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public static boolean GenerateImage(String base64str, String savePath) {
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//对字节数组字符串进行Base64解码并生成图片
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if (base64str == null) {
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return false;
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}
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try {
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//Base64解码
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byte[] b = Base64.decodeBase64(base64str);
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for (int i = 0; i < b.length; ++i) {
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//调整异常数据
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if (b[i] < 0) {
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b[i] += 256;
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}
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}
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//生成jpeg图片
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OutputStream out = new FileOutputStream(savePath);
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out.write(b);
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out.flush();
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out.close();
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return true;
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} catch (Exception e) {
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return false;
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}
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}
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}
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