一、HttpPost上传文件

public static String getSuffix(final MultipartFile file){        if(file == null || file.getSize() == 0){            return null;        }        String fileName = file.getOriginalFilename();        return fileName.substring(fileName.lastIndexOf(".")+1);    }public static JSONObject uploadFile(String urlStr, MultipartFile file, String token) throws IOException {        // 后缀        String suffix = getSuffix(file);        CloseableHttpClient httpClient = HttpClients.createDefault();        HttpPost uploadFile = new HttpPost(urlStr);        uploadFile.setHeader("authorization","Bearer " + token);        DecimalFormat df = new DecimalFormat("#.##");        MultipartEntityBuilder builder = MultipartEntityBuilder.create();        //  HTTP.PLAIN_TEXT_TYPE,HTTP.UTF_8        builder.addTextBody("name", file.getOriginalFilename(), ContentType.create("text/plain", Consts.UTF_8));        builder.addTextBody("size", df.format((double) file.getSize() / 1024), ContentType.TEXT_PLAIN);        builder.addTextBody("suffix", suffix, ContentType.TEXT_PLAIN);        // 把文件加到HTTP的post请求中                // String filepath = "/user/test/123.png"        // File f = new File(filepath);        builder.addBinaryBody(                "file",                file.getInputStream(),                                // new FileInputStream(f),                ContentType.APPLICATION_OCTET_STREAM,                file.getOriginalFilename()        );        HttpEntity multipart = builder.build();        uploadFile.setEntity(multipart);        CloseableHttpResponse response = httpClient.execute(uploadFile);        HttpEntity responseEntity = response.getEntity();        String sResponse= EntityUtils.toString(responseEntity, "UTF-8");        JSONObject jsonObject = JSONObject.parseObject(sResponse);        // {"code":1,"data":"7efb19980373dd90f5077576afa7481a","message":""}        // {"code":401,"httpStatus":null,"data":"373656a2-baff-423a-93fb-704f51003509","message":"error"}        return jsonObject;    }

二、HttpGet对API进行Get请求

两张方式：

1、在URL中拼接

CloseableHttpClient httpClient = HttpClients.createDefault();String urlStr ="http://abc.com/oss/getUrl?id=" + ossFileId;HttpGet httpGet = new HttpGet(urlStr);// 使用Oauth2进行权限验证httpGet.setHeader("authorization","Bearer 34195fa8-00a6-4288-bda9-7d37541c3a39");CloseableHttpResponse response = httpClient.execute(httpGet);HttpEntity responseEntity = response.getEntity();String sResponse= EntityUtils.toString(responseEntity, "UTF-8");System.out.println(sResponse);JSONObject jsonObject = JSONObject.parseObject(sResponse);System.out.println(jsonObject);

2、使用参数的方式

        CloseableHttpClient httpClient = HttpClients.createDefault();        /*         * 由于GET请求的参数都是拼装在URL地址后方，所以我们要构建一个URL，带参数         */        URIBuilder uriBuilder = new URIBuilder("http://www.baidu.com");        /** 第一种添加参数的形式 */        /*uriBuilder.addParameter("name", "root");        uriBuilder.addParameter("password", "123456");*/        /** 第二种添加参数的形式 */        List<NameValuePair> list = new LinkedList<>();        BasicNameValuePair param1 = new BasicNameValuePair("name", "root");        BasicNameValuePair param2 = new BasicNameValuePair("password", "123456");        list.add(param1);        list.add(param2);        uriBuilder.setParameters(list);        // 根据带参数的URI对象构建GET请求对象        HttpGet httpGet = new HttpGet(uriBuilder.build());        // 使用Oauth2进行权限验证        httpGet.setHeader("authorization","Bearer 34195fa8-00a6-4288-bda9-7d37541c3a39");        CloseableHttpResponse response = httpClient.execute(httpGet);        HttpEntity responseEntity = response.getEntity();        String sResponse= EntityUtils.toString(responseEntity, "UTF-8");        System.out.println(sResponse);        JSONObject jsonObject = JSONObject.parseObject(sResponse);        System.out.println(jsonObject);

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