Java中使用HttpPost上传文件以及HttpGet进行API请求（包含HttpPost上传文件）

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

两种方式：

• 使用在URL中拼接，已经进行过测试
• 使用URI进行参数构造的方式未进行测试

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

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

		CloseableHttpClient httpClient = HttpClients.createDefault();

        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);