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

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

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);

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);

来源：博客园

作者：codeobj

链接：https://www.cnblogs.com/codeobj/p/11670068.html

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