httpClient传输文件

        CloseableHttpClient httpClient = HttpClientBuilder.create().build();

        String url = "http://127.0.0.1/api/upload";

        String s = "C:\\Users\\Administrator\\Pictures\\image\\out.jpg";
        File file = new File(s);

        HttpPost httpPost = new HttpPost(url);

        FileBody fileBody = new FileBody(file);
        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE); //设置浏览器兼容模式
        builder.setCharset(Consts.UTF_8);//设置请求的编码格式
        builder.setContentType(ContentType.MULTIPART_FORM_DATA);// 设置 Content-Type
        builder.addPart("file", fileBody);
        httpPost.setEntity(builder.build());


        CloseableHttpResponse response = httpClient.execute(httpPost);

        HttpEntity entity = response.getEntity();

        String string = EntityUtils.toString(entity);

依赖

org.apache.httpcomponents
httpclient
4.5.1


org.apache.httpcomponents
httpmime
4.5.12

多文件操作

        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE); //设置浏览器兼容模式
        builder.setCharset(Consts.UTF_8);//设置请求的编码格式
        builder.setContentType(ContentType.MULTIPART_FORM_DATA);// 设置 Content-Type
        builder.addPart("file", fileBody);
        builder.addPart("file", fileBody2);
        httpPost.setEntity(builder.build());