package com.by4cloud.platformx.business.utils;
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import java.io.ByteArrayOutputStream;
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import java.io.InputStream;
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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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public class NetworkFileToBase64 {
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/**
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* 将网络地址的文件转换为 Base64 字符串
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*
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* @param fileUrl 网络文件的 URL 地址
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* @return Base64 编码字符串，失败返回 null
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*/
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public static String convertNetworkFileToBase64(String fileUrl) {
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InputStream inputStream = null;
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ByteArrayOutputStream outputStream = null;
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try {
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// 1. 创建 URL 对象
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URL url = new URL(fileUrl);
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// 2. 打开连接
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HttpURLConnection conn = (HttpURLConnection) url.openConnection();
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// 3. 设置请求属性和超时时间（防止长时间挂起）
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conn.setRequestMethod("GET");
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conn.setConnectTimeout(5000); // 连接超时 5秒
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conn.setReadTimeout(10000); // 读取超时 10秒
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// 4. 获取输入流
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int responseCode = conn.getResponseCode();
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if (responseCode != HttpURLConnection.HTTP_OK) {
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System.err.println("HTTP 错误代码: " + responseCode);
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return null;
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}
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inputStream = conn.getInputStream();
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outputStream = new ByteArrayOutputStream();
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// 5. 读取数据到内存
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byte[] buffer = new byte[1024];
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int len;
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while ((len = inputStream.read(buffer)) != -1) {
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outputStream.write(buffer, 0, len);
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}
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// 6. 获取字节数组并编码
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byte[] fileBytes = outputStream.toByteArray();
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return Base64.getEncoder().encodeToString(fileBytes);
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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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// 7. 关闭资源
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try {
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if (inputStream != null) inputStream.close();
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if (outputStream != null) outputStream.close();
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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}
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