java将字符串转成formdata,java中调用https接口 入参类型为String和form-data的图片

将字符串转成form-data可以使用Java的MultiPartEntityBuilder，示例代码如下：

String str = "hello world!";
StringBody stringBody = new StringBody(str, ContentType.TEXT_PLAIN);
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
builder.addPart("string", stringBody);
HttpEntity entity = builder.build();

调用https接口可以使用Java的HttpsURLConnection类，示例代码如下：

URL url = new URL("https://example.com/api");
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + entity.getBoundary());
OutputStream os = conn.getOutputStream();
entity.writeTo(os);
os.close();
int responseCode = conn.getResponseCode();
if (responseCode == HttpsURLConnection.HTTP_OK) {
    InputStream is = conn.getInputStream();
    // 处理响应数据
    is.close();
} else {
    // 处理错误响应
}

对于入参类型为form-data的图片，可以使用Java的FileBody将图片文件添加到MultiPartEntityBuilder中，示例代码如下：

File file = new File("path/to/image.jpg");
FileBody fileBody = new FileBody(file, ContentType.create("image/jpeg"), file.getName());
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
builder.addPart("image", fileBody);
HttpEntity entity = builder.build();