java httppost 获取文件流保存成pdf
时间: 2023-09-13 12:05:58 浏览: 41
你可以使用 Java 中的 HttpClient 类库来实现 HTTP POST 请求,从而获取文件流并保存为 PDF 格式。以下是一个简单的示例代码:
```java
import java.io.FileOutputStream;
import java.io.InputStream;
import org.apache.http.HttpEntity;
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.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
public class HttpPostExample {
public static void main(String[] args) throws Exception {
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost("http://example.com/upload");
// 构建文件上传请求体
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
builder.addBinaryBody("file", new FileInputStream("example.pdf"), ContentType.APPLICATION_OCTET_STREAM, "example.pdf");
HttpEntity entity = builder.build();
httpPost.setEntity(entity);
// 发送 HTTP POST 请求
HttpResponse response = httpClient.execute(httpPost);
HttpEntity responseEntity = response.getEntity();
// 读取响应内容并保存为 PDF 文件
InputStream is = responseEntity.getContent();
FileOutputStream fos = new FileOutputStream("example_result.pdf");
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1) {
fos.write(buffer, 0, len);
}
fos.close();
EntityUtils.consume(responseEntity);
}
}
```
在上面的代码中,我们首先创建了一个 HttpClient 对象和一个 HttpPost 对象,并设置了请求的 URL。然后使用 MultipartEntityBuilder 构建了一个文件上传请求体,并将其设置到 HttpPost 对象中。最后发送 HTTP POST 请求,并读取响应内容并保存为 PDF 文件。