java HttpURLConnection 发送文件和字符串信息

java HttpURLConnection 发送文件和字符串信息

以文件的形式传参

  public static void post(String actionUrl, Map params, Map files) throws IOException
  {

    String BOUNDARY = java.util.UUID.randomUUID().toString();
    String PREFIX = "--", LINEND = "rn";
    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); // 缓存的最长时间
    conn.setDoInput(true);// 允许输入
    conn.setDoOutput(true);// 允许输出
    conn.setUseCaches(false); // 不允许使用缓存
    conn.setRequestMethod("POST");
    conn.setRequestProperty("connection", "keep-alive");
    conn.setRequestProperty("Charsert", "UTF-8");
    conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);

    // 首先组拼文本类型的参数
    StringBuilder sb = new StringBuilder();
    for (Map.Entry 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;
    // 发送文件数据
    if (files != null)
    {
      for (Map.Entry file : files.entrySet())
      {
 StringBuilder sb1 = new StringBuilder();
 sb1.append(PREFIX);
 sb1.append(BOUNDARY);
 sb1.append(LINEND);
 // name是post中传参的键 filename是文件的名称
 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());
      }

      // 请求结束标志
      byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
      outStream.write(end_data);
      outStream.flush();
      // 得到响应码
      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();
  }

以数据流的形式传参

public static String postFile(String actionUrl, Map params, Map files)
      throws Exception
  {
    StringBuilder sb2 = null;
    String BOUNDARY = java.util.UUID.randomUUID().toString();
    String PREFIX = "--", LINEND = "rn";
    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); // 缓存的最长时间
    conn.setDoInput(true);// 允许输入
    conn.setDoOutput(true);// 允许输出
    conn.setUseCaches(false); // 不允许使用缓存
    conn.setRequestMethod("POST");
    conn.setRequestProperty("connection", "keep-alive");
    conn.setRequestProperty("Charsert", "UTF-8");
    conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);

    // 首先组拼文本类型的参数
    StringBuilder sb = new StringBuilder();
    for (Map.Entry 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;
    // 发送文件数据
    if (files != null)
    {
      for (Map.Entry 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());
      }

      // 请求结束标志
      byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
      outStream.write(end_data);
      outStream.flush();
      // 得到响应码
      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();
      // 解析服务器返回来的数据
      return ParseJson.getEditMadIconResult(sb2.toString());
    }
    else
    {
      return "Update icon Fail";
    }
    // return in.toString();
  }

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