Javaバックエンドファイルおよびその他のパラメータ付きPostリクエスト

Javaファイルやその他のパラメータを持つPostリクエストはファイルのアップロードに対して、クライアントは通常ページであり、フロントエンドのwebページでファイルのアップロードを実現するのは難しくない.formを書き、enctype=「multipart/form-data」を加えて、受信したものを書けばいい.難しくない.Javaを使用する場合は.net.HttpURLConnection、javaバックグラウンドでファイルのアップロードを実現するには、本当に頭が痛いです.実現の構想と具体的な手順はページの要求をシミュレートすることです.ページのフォーマットは以下の通りです.name=“luid”
123 -----------------------------7da2e536604c8 Content-Disposition: form-data; name=“file1”; filename=“D:\haha.txt” Content-Type: text/plain
haha hahaha -----------------------------7da2e536604c8 Content-Disposition: form-data; name=“file”; filename=“D:\huhu.png” Content-Type: application/octet-stream
ここでは画像のバイナリデータ--------------------------------------7 da 2 e 536604 c 8–demoコードには2つのパラメータしかなく、1つのFile、1つのString

public static void sendPostWithFile(String filePath) {
        DataOutputStream out = null;
        final String newLine = "\r
";
        final String prefix = "--";
        try {
            URL url = new URL("https://ws-di1.sit.cmrh.com/aiisp/v1/mixedInvoiceFileOCR");
            HttpURLConnection conn = (HttpURLConnection)url.openConnection();

            String BOUNDARY = "-------7da2e536604c8";
            conn.setRequestMethod("POST");
            //   POST          
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("Charsert", "UTF-8");
            conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);

            out = new DataOutputStream(conn.getOutputStream());

            //     file
            File file = new File(filePath);
            StringBuilder sb1 = new StringBuilder();
            sb1.append(prefix);
            sb1.append(BOUNDARY);
            sb1.append(newLine);
            sb1.append("Content-Disposition: form-data;name=\"file\";filename=\"" + file.getName() + "\"" + newLine);
            sb1.append("Content-Type:application/octet-stream");
            sb1.append(newLine);
            sb1.append(newLine);
            out.write(sb1.toString().getBytes());
            DataInputStream in = new DataInputStream(new FileInputStream(file));
            byte[] bufferOut = new byte[1024];
            int bytes = 0;
            while ((bytes = in.read(bufferOut)) != -1) {
                out.write(bufferOut, 0, bytes);
            }
            out.write(newLine.getBytes());
            in.close();

            //     sysName
            StringBuilder sb = new StringBuilder();
            sb.append(prefix);
            sb.append(BOUNDARY);
            sb.append(newLine);
            sb.append("Content-Disposition: form-data;name=\"sysName\"");
            sb.append(newLine);
            sb.append(newLine);
            sb.append("test");
            out.write(sb.toString().getBytes());
			
			 //     returnImage
            StringBuilder sb2 = new StringBuilder();
            sb2.append(newLine);
            sb2.append(prefix);
            sb2.append(BOUNDARY);
            sb2.append(newLine);
            sb2.append("Content-Disposition: form-data;name=\"returnImage\"");
            sb2.append(newLine);
            sb2.append(newLine);
            sb2.append("false");
            out.write(sb2.toString().getBytes());

            byte[] end_data = ("\r
--" + BOUNDARY + "--\r
").getBytes();
            //       
            out.write(end_data);
            out.flush();
            out.close();

            //   BufferedReader      URL   
            BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line = null;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }

        } catch (Exception e) {
            System.out.println("  POST      ！" + e);
            e.printStackTrace();
        }
    }

借り【javaバックグラウンドでファイルをアップロードするpostリクエスト(httpとhttps)】
自分でカプセル化したクラス、汎用クラス

/**
 * post     file
 *     
 * JSONObject jp = new JSONObject();
 *  String param = jp.toJSONString()
 */
 public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // URL realUrl = new URL("https://testzoms.txffp.com/pcs/app/common/checkInvoice");
            URLConnection conn = realUrl.openConnection();
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            //   POST          
            conn.setDoOutput(true);
            conn.setDoInput(true);
            out = new PrintWriter(conn.getOutputStream());
            out.print(param);
            out.flush();
            //   BufferedReader      URL   
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
                // System.out.println(result);
            }
        } catch (Exception e) {
            System.out.println("   POST       ！" + e);
            e.printStackTrace();
        }
        //   finally       、   
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }

    /**
     * post    file,map     
     */
     
    public static JSONObject sendPostWithFile(MultipartFile file, HashMap map) {
        DataOutputStream out = null;
        DataInputStream in = null;
        final String newLine = "\r
";
        final String prefix = "--";
        JSONObject json = null;
        PropUtils propUtils = new PropUtils("cfg.properties");
        try {
            String fileOCRUrl = propUtils.getProp("fileOCRUrl");
            URL url = new URL(fileOCRUrl);
            HttpURLConnection conn = (HttpURLConnection)url.openConnection();

            String BOUNDARY = "-------KingKe0520a";
            conn.setRequestMethod("POST");
            //   POST          
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("Charsert", "UTF-8");
            conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
            out = new DataOutputStream(conn.getOutputStream());

            //     file
            // File file = new File(filePath);
            StringBuilder sb1 = new StringBuilder();
            sb1.append(prefix);
            sb1.append(BOUNDARY);
            sb1.append(newLine);
            sb1.append("Content-Disposition: form-data;name=\"file\";filename=\"" + file.getName() + "\"" + newLine);
            sb1.append("Content-Type:application/octet-stream");
            sb1.append(newLine);
            sb1.append(newLine);
            out.write(sb1.toString().getBytes());
            // in = new DataInputStream(new FileInputStream(file));
            in = new DataInputStream(file.getInputStream());
            byte[] bufferOut = new byte[1024];
            int bytes = 0;
            while ((bytes = in.read(bufferOut)) != -1) {
                out.write(bufferOut, 0, bytes);
            }
            out.write(newLine.getBytes());

            StringBuilder sb = new StringBuilder();
            int k = 1;
            for (String key : map.keySet()) {
                if (k != 1) {
                    sb.append(newLine);
                }
                sb.append(prefix);
                sb.append(BOUNDARY);
                sb.append(newLine);
                sb.append("Content-Disposition: form-data;name=" + key + "");
                sb.append(newLine);
                sb.append(newLine);
                sb.append(map.get(key));
                out.write(sb.toString().getBytes());
                sb.delete(0, sb.length());
                k++;
            }

            //     sysName
            /*StringBuilder sb = new StringBuilder();
            sb.append(prefix);
            sb.append(BOUNDARY);
            sb.append(newLine);
            sb.append("Content-Disposition: form-data;name=\"sysName\"");
            sb.append(newLine);
            sb.append(newLine);
            sb.append("test");
            out.write(sb.toString().getBytes());*/

            //     returnImage
            /*StringBuilder sb2 = new StringBuilder();
            sb2.append(newLine);
            sb2.append(prefix);
            sb2.append(BOUNDARY);
            sb2.append(newLine);
            sb2.append("Content-Disposition: form-data;name=\"returnImage\"");
            sb2.append(newLine);
            sb2.append(newLine);
            sb2.append("false");
            out.write(sb2.toString().getBytes());*/

            byte[] end_data = ("\r
--" + BOUNDARY + "--\r
").getBytes();
            out.write(end_data);
            out.flush();

            //   BufferedReader      URL   
            BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line = null;
            StringBuffer resultStr = new StringBuffer();
            while ((line = reader.readLine()) != null) {
                resultStr.append(line);
            }
            json = (JSONObject)JSONObject.parse(resultStr.toString());

    } catch (Exception e) {
        System.out.println("  POST      ！" + e);
        e.printStackTrace();
    } finally {
        try {
            if (out != null) {
                out.close();
            }
            if (in != null) {
                in.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
        return json;
    }

/**
 *        
 * 	  ：        getProp()
 * 	new PropUtils(filePath)      ，resources       
 * @author jianbin
 */
public class PropUtils {
	private Properties properties;
	
	public PropUtils(String propertisFile) {
		InputStream in = null;
		try {
			properties = new Properties();
			in = PropUtils.class.getResourceAsStream("/"+propertisFile);
			properties.load(in);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public String getProp(String key){
		return properties.getProperty(key);
	}
	
	/*public static void main(String[] args) {
		PropUtils propUtils = new PropUtils("cfg.properties");
		String str = propUtils.getProp("jobStatus.3");
		System.out.println(str);
	}*/
	
}