Java发送Post请求上传图片

原文链接: https://www.cnblogs.com/enjoybeng/p/15403387.html

最近公司需要对接一个第三方平台，以前的接口POST请求只是发送key,value字符串，这次接口提供的字段中除了有String类型，还包含了File类型，找到两种方式来解决：
主方法

 

public static void main(String[] args) throws IOException { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式 String format = df.format(new Date());// new Date()为获取当前系统时间 String filePath1 = "C:\\Users\\Administrator\\Desktop\\2021101117.png"; String filePath2 = "C:\\Users\\Administrator\\Desktop\\2021101118.png"; File file1=new File(filePath1); File file2=new File(filePath2); File[] files = new File[2]; files[0] = file1; files[1] = file2; String url = "XXXXX" ; String appsecret = "XXXX"; HashMap<String,String> params = new HashMap<String,String>(); params.put("appkey", "XXXXX"); String appkey="XXXXX"; params.put("method", "fileUpload"); String method="fileUpload"; params.put("timestamp",format); String timestamp=format; params.put("customerId","XXX"); String customerId="XXX"; params.put("businessTypeKey","XXX"); String businessTypeKey="XXX"; String sign = SignUtils.getSign(appsecret,params); params.put("sign",sign); String url_final=url+"?appkey="+appkey+"&method="+method+"&timestamp="+timestamp+"&customerId="+customerId+"&businessTypeKey="+businessTypeKey+"&sign="+sign; Map<String,Object> results = postAction(url_final,files); //第一种方式：unirest String results = sendPost(String strurl,String fileName); //第二种方式：okhttp System.out.println(results.toString()); } 

第一种方式：unirest

 

/**第一种方式 <dependency> <groupId>com.konghq</groupId> <artifactId>unirest-java</artifactId> <version>3.11.11</version> </dependency> * @param url * @param files * @return */ public static Map<String,Object> postAction(String url,File[] files) { Map<String,Object> resultMap=new HashMap<>(); try { kong.unirest.HttpResponse<String> response = Unirest.post(url) .header("accept", "*/*") .field("files", files[0]) .field("files", files[1]) .asString(); String content= response.getBody().toString(); String statusText= response.getStatusText(); String status= String.valueOf(response.getStatus()); resultMap.put("content", content); resultMap.put("statusText", statusText); resultMap.put("status", status); if(!status.equals("200")) { SUCCESS=false; } resultMap.put("isSuc", SUCCESS); }catch (Exception e) { SUCCESS=false; resultMap.put("isSuc", SUCCESS); } return resultMap; } 

第二种方式：okhttp

 

/**第二种方式 * <dependency> <groupId>com.squareup.okhttp3</groupId> <artifactId>okhttp</artifactId> <version>3.2.0</version> </dependency> * @param strurl * @param files * @throws IOException */ public static String sendPost(String strurl,File[] files) throws IOException { OkHttpClient client = new OkHttpClient().newBuilder().build(); MediaType mediaType = MediaType.parse("multipart/form-data"); MultipartBody.Builder builder1 = new MultipartBody.Builder().setType(MultipartBody.FORM); for (int i = 0 ; i < files.length; i++){ builder1.addFormDataPart("files",files[i].getName(),RequestBody.create(MediaType.parse("application/octet-stream"), files[i])); } RequestBody body = builder1.build(); Request request = new Request.Builder() .url(strurl) .method("POST", body) .addHeader("accept", "*/*") .addHeader("Content-Type", "multipart/form-data") .build(); Response response = client.newCall(request).execute(); InputStream inputStream = response.body().byteStream(); byte[] getData = readInputStream(inputStream); inputStream.read(getData); String str = new String(getData); System.out.println (str); return str; } public static byte[] readInputStream(InputStream inputStream) throws IOException { byte[] buffer = new byte[1024]; int len = 0; ByteArrayOutputStream bos = new ByteArrayOutputStream(); while((len = inputStream.read(buffer)) != -1) { bos.write(buffer, 0, len); } bos.close(); return bos.toByteArray(); }