package com.basic.analy.utils;
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import java.io.ByteArrayOutputStream;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.util.Base64;
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import java.util.Date;
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public class Base64Utils {
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final static Base64.Decoder decoder = Base64.getDecoder();//接码
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final static Base64.Encoder encoder = Base64.getEncoder();//编码
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public static void main(String[] args) throws Exception {
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//本地图片地址 34kB
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String url1 = "C:/Users/Administrator/Desktop/文档/wp/picture/carousel2.jpg";
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String url2 = "C:/Users/Administrator/Desktop/文档/wp/picture/bjmb.png"; // 4kB
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System.out.println( System.currentTimeMillis()+"start转码前");
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System.out.println(new Date());
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//在线图片地址
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String string = "https://ss1.baidu.com/9vo3dSag_xI4khGko9WTAnF6hhy/image/h%3D300/sign=4bfc640817d5ad6eb5f962eab1c939a3/8718367adab44aedb794e128bf1c8701a08bfb20.jpg";
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String str = Base64Utils.ImageToBase64ByLocal(url1);
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// String ste = Base64Utils.ImageToBase64ByOnline(string);
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System.out.println( System.currentTimeMillis()+"start转码后");
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System.out.println(str);
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Base64Utils.Base64ToImage(str,"C:/Users/Administrator/Desktop/test1.jpg");
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System.out.println( System.currentTimeMillis()+"base64 转 图片");
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//Base64Utils.Base64ToImage(ste, "C:/Users/Administrator/Desktop/test2.jpg");
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}
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/**
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* 本地图片转换成base64字符串
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* @param imgFile 图片本地路径
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* @return
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*
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* @author ZHANGJL
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* @dateTime 2018-02-23 14:40:46
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*/
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public static String ImageToBase64ByLocal(String imgFile) {// 将图片文件转化为字节数组字符串，并对其进行Base64编码处理
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InputStream in = null;
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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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in = new FileInputStream(imgFile);
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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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// 对字节数组Base64编码
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return encoder.encodeToString(data);// 返回Base64编码过的字节数组字符串
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}
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// 将 流 装入
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public static String ImageToBase64ByInputStream(FileInputStream in) {// 将图片文件转化为字节数组字符串，并对其进行Base64编码处理
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//InputStream in = null;
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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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//in = new FileInputStream(imgFile);
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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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// 对字节数组Base64编码
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return encoder.encodeToString(data);// 返回Base64编码过的字节数组字符串
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}
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/**
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* 在线图片转换成base64字符串
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*
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* @param imgURL 图片线上路径
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* @return
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*
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* @author ZHANGJL
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* @dateTime 2018-02-23 14:43:18
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*/
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public static String ImageToBase64ByOnline(String imgURL) {
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ByteArrayOutputStream data = new ByteArrayOutputStream();
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try {
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// 创建URL
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URL url = new URL(imgURL);
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byte[] by = new byte[1024];
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// 创建链接
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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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// 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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// 对字节数组Base64编码
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return encoder.encodeToString(data.toByteArray());
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}
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/**
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* 在线图片转换成byte[]
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*
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* @param imgURL 图片线上路径
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* @return
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*
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* @author ZHANGJL
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* @dateTime 2018-02-23 14:43:18
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*/
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public static byte[] ImageToByteByOnline(String imgURL) {
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ByteArrayOutputStream data = new ByteArrayOutputStream();
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try {
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// 创建URL
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URL url = new URL(imgURL);
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byte[] by = new byte[1024*1024];
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// 创建链接
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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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// 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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// 对字节数组Base64编码
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/*String base64 = encoder.encodeToString(data.toByteArray());
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byte[] data1 = Base64Tobyte(base64);*/
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byte[] data1 = data.toByteArray();
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return data1;
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}
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/**
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* base64字符串转换成图片
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* @param imgStr base64字符串
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* @param imgFilePath 图片存放路径
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* @return
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*
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* @author ZHANGJL
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* @dateTime 2018-02-23 14:42:17
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*/
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public static boolean Base64ToImage(String imgStr,String imgFilePath) { // 对字节数组字符串进行Base64解码并生成图片
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if ("".equals(imgStr)) // 图像数据为空
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return false;
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try {
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// Base64解码
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byte[] b = decoder.decode(imgStr);
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for (int i = 0; i < b.length; ++i) {
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if (b[i] < 0) {// 调整异常数据
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b[i] += 256;
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}
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}
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OutputStream out = new FileOutputStream(imgFilePath);
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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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* base64字符串转换成byte[]
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* @param imgStr base64字符串
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* @return
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*
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* @author ZHANGJL
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* @dateTime 2018-02-23 14:42:17
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*/
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public static byte[] Base64Tobyte(String imgStr) { // 对字节数组字符串进行Base64解码并生成图片
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if ("".equals(imgStr)) // 图像数据为空
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return new byte[0];
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try {
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// Base64解码
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byte[] b = decoder.decode(imgStr);
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for (int i = 0; i < b.length; ++i) {
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if (b[i] < 0) {// 调整异常数据
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b[i] += 256;
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}
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}
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return b;
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} catch (Exception e) {
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return null;
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}
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}
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/**
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* byte[]转换成base64字符串
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* @param data base64字符串
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* @return
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*
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* @author ZHANGJL
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* @dateTime 2018-02-23 14:42:17
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*/
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public static String byteToBase64(byte[] data) { // 对字节数组字符串进行Base64解码并生成图片
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return encoder.encodeToString(data);
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}
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}
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