如何在java中使用HttpURLConnection實現(xiàn)發(fā)送文件與字符串信息

這篇文章給大家介紹如何在java中使用HttpURLConnection實現(xiàn)發(fā)送文件與字符串信息，內(nèi)容非常詳細，感興趣的小伙伴們可以參考借鑒，希望對大家能有所幫助。

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java HttpURLConnection 發(fā)送文件和字符串信息

以文件的形式傳參

/**
   * 通過拼接的方式構(gòu)造請求內(nèi)容，實現(xiàn)參數(shù)傳輸以及文件傳輸
   * 
   * @param actionUrl 訪問的服務器URL
   * @param params 普通參數(shù)
   * @param files 文件參數(shù)
   * @return
   * @throws IOException
   */
  public static void post(String actionUrl, Map<String, String> params, Map<String, File> files) throws IOException
  {

    String BOUNDARY = java.util.UUID.randomUUID().toString();
    String PREFIX = "--", LINEND = "\r\n";
    String MULTIPART_FROM_DATA = "multipart/form-data";
    String CHARSET = "UTF-8";

    URL uri = new URL(actionUrl);
    HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
    conn.setReadTimeout(5 * 1000); // 緩存的最長時間
    conn.setDoInput(true);// 允許輸入
    conn.setDoOutput(true);// 允許輸出
    conn.setUseCaches(false); // 不允許使用緩存
    conn.setRequestMethod("POST");
    conn.setRequestProperty("connection", "keep-alive");
    conn.setRequestProperty("Charsert", "UTF-8");
    conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);

    // 首先組拼文本類型的參數(shù)
    StringBuilder sb = new StringBuilder();
    for (Map.Entry<String, String> entry : params.entrySet())
    {
      sb.append(PREFIX);
      sb.append(BOUNDARY);
      sb.append(LINEND);
      sb.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINEND);
      sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);
      sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
      sb.append(LINEND);
      sb.append(entry.getValue());
      sb.append(LINEND);
    }

    DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());
    outStream.write(sb.toString().getBytes());
    InputStream in = null;
    // 發(fā)送文件數(shù)據(jù)
    if (files != null)
    {
      for (Map.Entry<String, File> file : files.entrySet())
      {
        StringBuilder sb1 = new StringBuilder();
        sb1.append(PREFIX);
        sb1.append(BOUNDARY);
        sb1.append(LINEND);
        // name是post中傳參的鍵 filename是文件的名稱
        sb1.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + file.getKey() + "\"" + LINEND);
        sb1.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINEND);
        sb1.append(LINEND);
        outStream.write(sb1.toString().getBytes());

        InputStream is = new FileInputStream(file.getValue());
        byte[] buffer = new byte[1024];
        int len = 0;
        while ((len = is.read(buffer)) != -1)
        {
          outStream.write(buffer, 0, len);
        }

        is.close();
        outStream.write(LINEND.getBytes());
      }

      // 請求結(jié)束標志
      byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
      outStream.write(end_data);
      outStream.flush();
      // 得到響應碼
      int res = conn.getResponseCode();
      if (res == 200)
      {
        in = conn.getInputStream();
        int ch;
        StringBuilder sb2 = new StringBuilder();
        while ((ch = in.read()) != -1)
        {
          sb2.append((char) ch);
        }
      }
      outStream.close();
      conn.disconnect();
    }
    // return in.toString();
  }

以數(shù)據(jù)流的形式傳參

public static String postFile(String actionUrl, Map<String, String> params, Map<String, byte[]> files)
      throws Exception
  {
    StringBuilder sb2 = null;
    String BOUNDARY = java.util.UUID.randomUUID().toString();
    String PREFIX = "--", LINEND = "\r\n";
    String MULTIPART_FROM_DATA = "multipart/form-data";
    String CHARSET = "UTF-8";

    URL uri = new URL(actionUrl);
    HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
    conn.setReadTimeout(6 * 1000); // 緩存的最長時間
    conn.setDoInput(true);// 允許輸入
    conn.setDoOutput(true);// 允許輸出
    conn.setUseCaches(false); // 不允許使用緩存
    conn.setRequestMethod("POST");
    conn.setRequestProperty("connection", "keep-alive");
    conn.setRequestProperty("Charsert", "UTF-8");
    conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);

    // 首先組拼文本類型的參數(shù)
    StringBuilder sb = new StringBuilder();
    for (Map.Entry<String, String> entry : params.entrySet())
    {
      sb.append(PREFIX);
      sb.append(BOUNDARY);
      sb.append(LINEND);
      sb.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINEND);
      sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);
      sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
      sb.append(LINEND);
      sb.append(entry.getValue());
      sb.append(LINEND);
    }

    DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());
    outStream.write(sb.toString().getBytes());
    InputStream in = null;
    // 發(fā)送文件數(shù)據(jù)
    if (files != null)
    {
      for (Map.Entry<String, byte[]> file : files.entrySet())
      {
        StringBuilder sb1 = new StringBuilder();
        sb1.append(PREFIX);
        sb1.append(BOUNDARY);
        sb1.append(LINEND);
        sb1.append("Content-Disposition: form-data; name=\"pic\"; filename=\"" + file.getKey() + "\"" + LINEND);
        sb1.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINEND);
        sb1.append(LINEND);
        outStream.write(sb1.toString().getBytes());

        // InputStream is = new FileInputStream(file.getValue());
        // byte[] buffer = new byte[1024];
        // int len = 0;
        // while ((len = is.read(buffer)) != -1)
        // {
        // outStream.write(buffer, 0, len);
        // }
        // is.close();
        outStream.write(file.getValue());

        outStream.write(LINEND.getBytes());
      }

      // 請求結(jié)束標志
      byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
      outStream.write(end_data);
      outStream.flush();
      // 得到響應碼
      int res = conn.getResponseCode();
      if (res == 200)
      {
        in = conn.getInputStream();
        int ch;
        sb2 = new StringBuilder();
        while ((ch = in.read()) != -1)
        {
          sb2.append((char) ch);
        }
        System.out.println(sb2.toString());
      }
      outStream.close();
      conn.disconnect();
      // 解析服務器返回來的數(shù)據(jù)
      return ParseJson.getEditMadIconResult(sb2.toString());
    }
    else
    {
      return "Update icon Fail";
    }
    // return in.toString();
  }

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如何在java中使用HttpURLConnection實現(xiàn)發(fā)送文件與字符串信息