【Java开发】之网络图片转Base64

客官°小女子只卖身不卖艺 2022-09-14 02:16 227阅读 0赞

### 1、引入依赖 ###

<dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.13</version>
    </dependency>

### 2、获取图片并转Base64 ###

@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();
        }

### 3、前端显示Base64图片 ###

<!DOCTYPE html>
    <html>
    <head>
        <title>Image</title>
    </head>
    <body>
        <img src="data:image/png;base64, 将base64编码数据放在这里 ">
    </body>
    </html>