125 lines
4.1 KiB
Java
125 lines
4.1 KiB
Java
package com.zhgd.xmgl.util;
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import cn.hutool.core.io.FileUtil;
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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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public class Base64Util {
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public static String getURLImage(String imageUrl) {
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String base64String = "";
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try {
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//new一个URL对象
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URL url = new URL(imageUrl);
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//打开链接
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HttpURLConnection conn = (HttpURLConnection) url.openConnection();
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//设置请求方式为"GET"
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conn.setRequestMethod("GET");
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//超时响应时间为5秒
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conn.setConnectTimeout(20 * 1000);
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conn.setReadTimeout(20 * 1000);
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//通过输入流获取图片数据
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InputStream inStream = conn.getInputStream();
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//得到图片的二进制数据，以二进制封装得到数据，具有通用性
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byte[] data = readInputStream(inStream);
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base64String = Base64.encodeBase64String(data);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return base64String;
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}
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/**
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* 本地文件（图片、excel等）转换成Base64字符串
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*
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* @param imgPath
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*/
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public static String convertFileToBase64(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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// 对字节数组进行Base64编码，得到Base64编码的字符串
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String base64Str = Base64.encodeBase64String(data);
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return base64Str;
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}
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public static String getFileToBase64(String imgPath) {
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if (imgPath.indexOf("http") >= 0) {
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return getURLImage(imgPath);
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} else {
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return convertFileToBase64(imgPath);
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}
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}
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private static byte[] readInputStream(InputStream inStream) throws Exception {
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ByteArrayOutputStream outStream = new ByteArrayOutputStream();
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//创建一个Buffer字符串
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byte[] buffer = new byte[1024];
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//每次读取的字符串长度，如果为-1，代表全部读取完毕
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int len = 0;
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//使用一个输入流从buffer里把数据读取出来
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while ((len = inStream.read(buffer)) != -1) {
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//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
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outStream.write(buffer, 0, len);
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}
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//关闭输入流
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inStream.close();
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//把outStream里的数据写入内存
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return outStream.toByteArray();
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}
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public static File convertBase64ToFile(String fileBase64String, String filePath, String fileName) {
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BufferedOutputStream bos = null;
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FileOutputStream fos = null;
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File file;
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try {
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File dir = new File(filePath);
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// 判断文件目录是否存在
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if (!dir.exists()) {
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FileUtil.mkdir(dir);
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}
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java.util.Base64.Decoder decoder = java.util.Base64.getMimeDecoder();
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//BASE64Decoder decoder = new BASE64Decoder();
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//byte[] bfile = decoder.decodeBuffer(fileBase64String);
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byte[] bfile = decoder.decode(fileBase64String);
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file = new File(filePath + File.separator + fileName);
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fos = new FileOutputStream(file);
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bos = new BufferedOutputStream(fos);
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bos.write(bfile);
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return file;
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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} finally {
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if (bos != null) {
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try {
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bos.close();
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} catch (IOException e1) {
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e1.printStackTrace();
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}
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}
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if (fos != null) {
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try {
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fos.close();
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} catch (IOException e1) {
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e1.printStackTrace();
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}
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}
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}
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}
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}
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