java httppost 获取pdf文件流
时间: 2023-09-13 19:05:57 浏览: 45
和获取其他类型的文件流类似,我们可以使用 Apache HttpComponents 库中的 HttpPost 类来发送 POST 请求并获取 PDF 文件流。以下是示例代码:
```
import java.io.InputStream;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
public class HttpPostExample {
public static void main(String[] args) throws Exception {
String url = "http://example.com/pdf";
String filePath = "/path/to/file.pdf";
// Create POST request
HttpClient client = HttpClientBuilder.create().build();
HttpPost post = new HttpPost(url);
// Add file to request body
HttpEntity entity = MultipartEntityBuilder.create()
.addBinaryBody("file", new File(filePath))
.build();
post.setEntity(entity);
// Send request and receive response
HttpResponse response = client.execute(post);
HttpEntity responseEntity = response.getEntity();
// Get PDF file stream from response entity
InputStream inputStream = responseEntity.getContent();
// Use PDF file stream as needed
// ...
// Release resources
EntityUtils.consume(responseEntity);
}
}
```
在上面的代码中,我们首先创建了一个 HttpClient 对象,然后创建一个 HttpPost 对象并设置 URL。接下来,我们使用 MultipartEntityBuilder 类创建一个包含 PDF 文件的请求体,并将其设置为 HttpPost 对象的实体。最后,我们发送请求并从响应中获取 PDF 文件流。注意,我们需要手动释放响应实体的资源,以避免内存泄漏。