java调用post接口获取图纸PDF

您好！可以使用Java中的HttpURLConnection或者HttpClient发送POST请求来调用接口获取图纸PDF。以下是使用HttpURLConnection的示例代码：

import java.io.*;
import java.net.*;

public class PDFDownloader {
    public static void main(String[] args) throws Exception {
        // 设置请求参数
        String url = "http://example.com/api/download/pdf";
        String requestData = "drawingId=12345"; // 以表单形式提交参数
        byte[] requestDataBytes = requestData.getBytes("UTF-8");

        // 创建连接
        URL requestUrl = new URL(url);
        HttpURLConnection connection = (HttpURLConnection) requestUrl.openConnection();
        connection.setRequestMethod("POST");
        connection.setDoOutput(true);
        connection.setUseCaches(false);
        connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        connection.setRequestProperty("Content-Length", "" + requestDataBytes.length);

        // 发送请求
        OutputStream outputStream = connection.getOutputStream();
        outputStream.write(requestDataBytes);
        outputStream.flush();
        outputStream.close();

        // 读取响应
        InputStream inputStream = connection.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
        String line;
        StringBuilder responseData = new StringBuilder();
        while ((line = reader.readLine()) != null) {
            responseData.append(line);
        }
        reader.close();
        System.out.println("Response: " + responseData.toString());
        inputStream.close();

        // 将响应保存为PDF文件
        FileOutputStream fileOutputStream = new FileOutputStream("drawing.pdf");
        byte[] responseBytes = responseData.toString().getBytes("ISO-8859-1"); // 将字符串转换为字节数组
        fileOutputStream.write(responseBytes);
        fileOutputStream.flush();
        fileOutputStream.close();
    }
}

在上面的示例代码中，我们首先设置了请求参数，然后创建了一个HttpURLConnection对象并发送了POST请求。最后，我们读取响应并将其保存为PDF文件。

请注意：以上代码仅供参考，请根据实际情况进行修改和优化。