okhttp传输文件类型的参数

引入okhttp依赖

<!-- okhttp -->
<dependency>
    <groupId>com.squareup.okhttp3</groupId>
    <artifactId>okhttp</artifactId>
    <version>3.14.9</version>
</dependency>

代码示例

/**
 * @param url 请求路径
 * @param key 请求参数名称
 * @param file 请求文件路径
 * @return 响应结果
 **/
public static String uploadFile(String url, String key, File file) {
    //最好设置一下connectTimeout、readTimeout、writeTimeout，这三个参数默认10s，可能传输文件会出现超时
OkHttpClient client = new OkHttpClient();
    RequestBody requestBody = new MultipartBody.Builder()
            .setType(MultipartBody.FORM)
            .addFormDataPart(key, file.getName(), RequestBody.create(MULTIPART_FORM_DATA, file))
            .build();

    Request request = new Request.Builder()
            .url(url)
            .post(requestBody)
            .build();

    try (Response response = client.newCall(request).execute()) {
    if (response.isSuccessful() && response.body() != null) {
        return response.body().string();
    }
} catch (IOException e) {
    //todo exception
}

	return null;
}

比如：Java Controller定义的excel作为请求参数

@PostMapping("test")
public Response saveByExcel(@RequestParam("file") MultipartFile importFile) {
}

uploadFile方法请求的key参数就是file