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

/**
   * 通过拼接的方式构造请求内容，实现参数传输以及文件传输
   * 
   * @param actionurl 访问的服务器url
   * @param params 普通参数
   * @param files 文件参数
   * @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); // 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<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;
    // 发送文件数据
    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<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); // 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<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;
    // 发送文件数据
    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());
      }

      // 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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