英文:
Get response image as Base64
问题
我有一个链接，响应是一张图片。
我想使用 apache-httpclient，将这张图片获取为 base64。
以下是我写的代码：
try (CloseableHttpClient httpClient = HttpClients.createDefault()) {HttpGet httpGet = new HttpGet("...");try (CloseableHttpResponse httpResponse = httpClient.execute(httpGet)) {int code = httpResponse.getStatusLine().getStatusCode();String body = EntityUtils.toString(httpResponse.getEntity());if (code == HttpStatus.SC_OK) {System.out.print(body); //返回奇怪的字符 ⍁return;}String reason = httpResponse.getStatusLine().getReasonPhrase();throw new Exception("错误 - 代码：" + code + " - 原因：" + reason + " - 响应内容：" + body);}} catch (Exception e) {e.printStackTrace();}
这个 EntityUtils.toString(httpResponse.getEntity()); 不太好。它只返回了一堆 ⍁。
我该如何将图片获取为 base64？
我尝试了
Base64.getEncoder().encodeToString(EntityUtils.toString(httpResponse.getEntity()).getBytes());
但结果表示一个无效的图片。
测试用的链接: https://i.stack.imgur.com/jRsnt.jpg - 我在处理这个链接时遇到问题。
英文:
I have a link which gives as response an image.
I want, with apache-httpclient, to get this image as base64.
This is what I wrote:
try(CloseableHttpClient httpClient = HttpClients.createDefault()){HttpGet httpGet = new HttpGet("...");try(CloseableHttpResponse httpResponse = httpClient.execute(httpGet)){int code = httpResponse.getStatusLine().getStatusCode();String body = EntityUtils.toString(httpResponse.getEntity());if(code == HttpStatus.SC_OK){System.out.print(body); //returns weird chars ⍁return;}String reason = httpResponse.getStatusLine().getReasonPhrase();throw new Exception("Error - code: " + code + " - reason: " + reason + " - body: " + body);}}catch (Exception e){e.printStackTrace();}
This EntityUtils.toString(httpResponse.getEntity()); is not good. It returns just a bunch of ⍁.
How I can get the image as base64?
I tried
Base64.getEncoder().encodeToString(EntityUtils.toString(httpResponse.getEntity()).getBytes());
but the result represent an invalid image.
URL for test: https://i.stack.imgur.com/jRsnt.jpg - with this one I have problems.
答案1
得分: 1
try (CloseableHttpClient httpClient = HttpClients.createDefault()) {HttpGet httpGet = new HttpGet("https://i.imgur.com/sIm1gSs.jpg");try (CloseableHttpResponse httpResponse = httpClient.execute(httpGet)) {int code = httpResponse.getStatusLine().getStatusCode();// 从httpclient获取流，需要将其转换为字节数组// 我们将使用ByteArrayOutputStreamByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();httpResponse.getEntity().writeTo(byteArrayOutputStream); // 写入ByteArrayStreamString body = Base64.getEncoder().encodeToString(byteArrayOutputStream.toByteArray());if (code == HttpStatus.SC_OK) {System.out.print(body); // 返回有效的Base64图片return;}String reason = httpResponse.getStatusLine().getReasonPhrase();throw new Exception("错误 - 代码：" + code + " - 原因：" + reason + " - 正文：" + body);}} catch (Exception e) {e.printStackTrace();}
英文:
You need to convert received Stream (from HTTPClient entity class) to byte array.
I made some minor tweaks to your code and it works fine now (returns a valid base64 representation of image)
try(CloseableHttpClient httpClient = HttpClients.createDefault()){HttpGet httpGet = new HttpGet("https://i.imgur.com/sIm1gSs.jpg");try(CloseableHttpResponse httpResponse = httpClient.execute(httpGet)){int code = httpResponse.getStatusLine().getStatusCode();// You are getting stream from httpclient. It needs to be converted to byte array// We will use byteArrayOutputStream.ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();httpResponse.getEntity().writeTo(byteArrayOutputStream); // Writing to ByteArrayStreamString body = Base64.getEncoder().encodeToString(byteArrayOutputStream.toByteArray());if(code == HttpStatus.SC_OK){System.out.print(body); //returns valid Base64 imagereturn;}String reason = httpResponse.getStatusLine().getReasonPhrase();throw new Exception("Error - code: " + code + " - reason: " + reason + " - body: " + body);}}catch (Exception e){e.printStackTrace();}
答案2
得分: 0
我找到了将图像转换为Base64的方法：
BufferedImage bufferedImage = ImageIO.read(httpResponse.getEntity().getContent());ByteArrayOutputStream baos = new ByteArrayOutputStream();ImageIO.write(bufferedImage, "jpg", baos);baos.flush();byte[] imageInByte = baos.toByteArray();baos.close();String body = Base64.getEncoder().encodeToString(imageInByte);
英文:
I found the way to get the image as base64:
BufferedImage bufferedImage = ImageIO.read(httpResponse.getEntity().getContent());ByteArrayOutputStream baos = new ByteArrayOutputStream();ImageIO.write(bufferedImage, "jpg", baos);baos.flush();byte[] imageInByte = baos.toByteArray();baos.close();String body = Base64.getEncoder().encodeToString(imageInByte);
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