【Java开发】之网络图片转Base64

    org.apache.httpcomponents
    httpclient
    4.5.13

@Test
    void Test() throws IOException {

        // 获取图片流
        HttpGet httpGet = new HttpGet("图片url");
        httpGet.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64)");
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = httpClient.execute(httpGet);
        HttpEntity entity = response.getEntity();
        InputStream inputStream = entity.getContent();

        // 从流中获取数据
        byte[] data = new byte[(int) entity.getContentLength()];
        int offset = 0;
        int readBytes = 0;
        do {
            readBytes = inputStream.read(data, offset, 2048);
            offset += readBytes;
        } while (readBytes != -1);

        // base64 编码
        base64.Encoder encoder = base64.getEncoder();
        String result = encoder.encodeToString(data);
        System.out.println(result);

        // 关闭资源
        response.close();
        httpClient.close();
    }