【别问系列】JAVA代码实现微信小程序云开发 Http API 上传文件。

别问，看。

过程：

1. JAVA->云环境请求上传到cos的权限

2. JAVA->COS上传文件

1. 请求上传文件：

        String access_token = "你获取的ACCESS_TOKEN";

        String url = "https://api.weixin.qq.com/tcb/uploadfile?access_token=" + access_token;// service.getAccessToken();
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost httpPost = new HttpPost(url);
        httpPost.addHeader(HTTP.CONTENT_TYPE, "application/json");

        JsonObject req = new JsonObject();
        req.addProperty("env", "wxss-brick-dev-9p9ie"); // 云开发环境 从小程序-云开发面板里面找到
        req.addProperty("path", "findshop/stores.json"); // 上传的路径，实际上没鸟用，上传文件需要再次指定
        StringEntity entity = new StringEntity(req.toString());
        httpPost.setEntity(entity);
        org.apache.http.HttpResponse response1;
        response1 = httpClient.execute(httpPost);
        InputStream inputStream = response1.getEntity().getContent();

        ByteArrayOutputStream out = new ByteArrayOutputStream();
        byte[] buffer = new byte[8192];
        int bytesRead = 0;
        while ((bytesRead = inputStream.read(buffer, 0, 8192)) != -1) {
            out.write(buffer, 0, bytesRead);
        }

        out.flush();
        out.close();
        System.out.println(new String(out.toByteArray()));

这个时候，会获得一个返回JSON：

{
    "errcode": 0,
    "errmsg": "ok",
    "url": "https:\/\/cos.ap-shanghai.myqcloud.com\/7778-wxss-brick-dev-9p9ie-1257336119\/findshop\/stores.json",
    "token": "U9AYtVnyBnVM4LiycLOHEdtAeCvV2iza873d0053a37d7e94901ddb969ab51a40SumfJkyblnKjN-u0I8hv-RBNgiLAeS70nsoX0Kq1rfWkBRYEyJ5S55bUpYrbeiIttEbh-E9VqGxW3SeuRwSQ4alQeoa2uHfZQ3oyJochMBWPY3FmV4Vs_heU6EIb8PZpvLzlniE31QVWgJrV0XBlirakVSBXoZLxCYYmZyBk4ixAJCWdvZ91-u4o0hXjVATKAwflK8OE4-7UT6ThJS8d4u39WR34lfLbkV1B4Og7jVxXSz-6xoyeP_YG3DCbsJ7yd_An_MPbc3TT87Jay4mZ_Zg2FK35hJRNZBWcrZpBpuRrTdbNL2rG4Rv5pkwK8AcNxFFS4ZyzoT_qCfwnC5SFtvrQ_dRkhmOkCQiNPdAzUjU",
    "authorization": "q-sign-algorithm=sha1&q-ak=AKIDHdRV1dId9UIlohYFVT7GDHOP5JF-5Yu-iIMsuT6tLB3N7xgczyLj1I7HiW3gbegH&q-sign-time=1644118512;1644119412&q-key-time=1644118512;1644119412&q-header-list=&q-url-param-list=&q-signature=e2f4e4950426570b76f490dae5fce2cd1564d0ab",
    "file_id": "cloud:\/\/wxss-brick-dev-9p9ie.7778-wxss-brick-dev-9p9ie-1257336119\/findshop\/stores.json",
    "cos_file_id": "HHHxuB6f44VmGYFLjPyQISTiYGQLyEsHQLmmNO1ncoimL+YCzQ8WQvFgX7mUOe\/1Z9dGXLrWeiQB1ubjhYUVmoxcKzndW0h+o\/uQxgm3Fh8yG9v1VnNTh6ryJ0Uu00LQ1YxrL8clnzw1NvG\/ftZfMqA5vHEtWo5dAgwnWTw4TuvCIFPIYE\/bSvUSvA=="
}

2. 然后利用这个返回JSON再构造一个上传请求：代码紧接上文即可。

        req = JsonUtils.toJson(new String(out.toByteArray())).getAsJsonObject();

        RestTemplate template = new RestTemplate();
        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.setContentType(org.springframework.http.MediaType.MULTIPART_FORM_DATA);

        MultiValueMap<String, Object> map = new LinkedMultiValueMap<>();
        map.add("key", "helloworld.json");
        map.add("Signature", req.get("authorization").getAsString());
        map.add("x-cos-security-token", req.get("token").getAsString());
        map.add("x-cos-meta-fileid", req.get("cos_file_id").getAsString());
        map.add("file", FileUtils.readFileToByteArray((new File("stores.json"))));
        HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<MultiValueMap<String, Object>>(map, httpHeaders);

        url = req.get("url").getAsString();

        ResponseEntity<Object> responseEntity = template.postForEntity(url, httpEntity, Object.class);
        System.out.println(responseEntity);

得到一个返回：

[Content - Length: "0",
    Connection: "keep-alive",
    Date: "Sun, 06 Feb 2022 04:55:23 GMT",
    ETag: ""
    9 f984a7876e8a9ba68b33e4ce9fa6e07 "",
    Location: "http://cos.ap-shanghai.myqcloud.com/helloworld.json",
    Server: "tencent-cos",
    x - cos - hash - crc64ecma: "15603994211910412157",
    x - cos - request - id: "NjFmZjU0YmFfNjFhMDA4MDlfMTQ3YjdfMjZlNzRkNg=="
]

全部完成！

美丽人生

凤凰

【别问系列】JAVA代码实现微信小程序云开发 Http API 上传文件。

美丽人生

凤凰

【别问系列】JAVA代码实现 微信小程序 云开发 Http API 上传文件。

【别问系列】JAVA代码实现微信小程序云开发 Http API 上传文件。