android文件上传到服务器

最新推荐文章于 2021-08-09 17:59:48 发布

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最新推荐文章于 2021-08-09 17:59:48 发布

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CC 4.0 BY-SA版权

文章标签：移动开发操作系统 php

原文链接：http://blog.51cto.com/sensen/773481

本文提供了一个Java方法用于通过HTTP POST请求上传文件，包括简单的PHP测试代码和Android中发送HTTP请求的实例。该方法支持多文件上传、中文文件名上传及返回JSON数据。

/**
* 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
* @param params
* @param files
* @return
* @throws IOException
*/
public static String 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());
  // 发送文件数据
  if(files!=null){
    int i = 0;
    for (Map.Entry<String, File> file: files.entrySet()) {
      StringBuilder sb1 = new StringBuilder();
      sb1.append(PREFIX);
      sb1.append(BOUNDARY);
      sb1.append(LINEND);
      sb1.append("Content-Disposition: form-data; name=\"file"+(i++)+"\"; 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();
  InputStream in = null;
  if (res == 200) {
    in = conn.getInputStream();
    int ch;
    StringBuilder sb2 = new StringBuilder();
    while ((ch = in.read()) != -1) {
      sb2.append((char) ch);
    }
  }
  return in == null ? null : in.toString();
}

最简单的PHP测试代码：

if($_FILES){
  foreach($_FILES as $v){
    copy($v[tmp_name], $v[name]);
  }
}

参考自 Android中发送Http请求实例（包括文件上传、servlet接收），修复了几个问题：
1 多文件上传 file"+(i++)+"
2 返回的错误

另外还可以看看这个（我没测试） android 文件上传的类--完整可以直接被调用的

这有一个从协议上分析的，比较牛叉：Android下的应用编程——用HTTP协议实现文件上传功能

原创内容如转载请注明：来自阿权的书房 <script> //<![cdata[ document.write("<br />本帖地址：<a href=\""+window.location+"\">"+window.location+"</a>"); //]]> </script>
本帖地址：http://www.aslibra.com/blog/post/android-upload-files-to-server.php

http 上传文件的方法

1. /**
2. *
3. * sendMultipartDataToHttpServer
4. * 使用post方法请求web服务器，并且当表单数据为：multipart/form-data格式。http请求使用{@link#HTTP_ENCODING}编码<br/>
5. * 返回json数据，支持文件名中文上传和多文件上传，不支持断点上传，要正确编码服务端返回{@link#HTTP_ENCODING}编码<br/>
6. * @param url
7. * @param files 文件表单域
8. * @param fields 非文件表单域
9. * @return JSONObject
10. * @throws Exception
11. * @exception
12. * @since 1.0.0
13. */
14. public static JSONObject sendMultipartDataToHttpServer(URL url,
15. final Map<String, File> files, final Map<String, String> fields,
16. final UsernamePasswordCredentials credentials) throws IOException ,JSONException,Exception{
17. URL myurl = null;
18. String queryString = "";
19. // 其他的表单域
20. if (fields != null) {
21. for (Map.Entry<String, String> entry : fields.entrySet()) {
22. queryString += "&" + URLEncoder.encode(entry.getKey(),HTTP_ENCODING) + "="
23. + URLEncoder.encode(entry.getValue(), HTTP_ENCODING);
24. }
25. }
26. if (!queryString.equals("")) {
27. queryString = queryString.replaceFirst("&", "?");
28. } else {
29. }
30.
31. myurl = new URL(url.getProtocol(), url.getHost(),url.getPort(), url.getPath()
32. + queryString);
33. HttpURLConnection conn = (HttpURLConnection) myurl.openConnection();
34. conn.setConnectTimeout(UPLOAD_REQUEST_TIMEOUT);
35. conn.setRequestMethod(HTTP_METHOD.POST.toString());
36. conn.setDoInput(true);
37. conn.setDoOutput(true);
38. conn.setUseCaches(false);
39.
40. String boundary = "laohuidi_" + java.util.UUID.randomUUID().toString()
41. + "_laohuidi";
42. conn.setRequestProperty(
43. "Accept",
44. "p_w_picpath/gif,p_w_picpath/x-xbitmap,p_w_picpath/jpeg,p_w_picpath/pjpeg,application/vnd.ms-excel,application/vnd.ms-powerpoint,application/msword,application/x-shockwave-flash,application/x-quickviewplus,*/*");
45. conn.setRequestProperty("keep-alive", "300");
46. conn.setRequestProperty(
47. "user-agent",
48. "Mozilla/5.0 (Windows; U; Windows NT 5.2; zh-CN; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6 GTB6");
49. conn.setRequestProperty("accept-language", "zh-cn,zh;q=0.5");
50. conn.setRequestProperty("Connection", "Keep-Alive");
51. conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+ boundary);
52.
53. DataOutputStream dos = new DataOutputStream(conn.getOutputStream());
54. // 乱码问题可以试下 PrintWriter out = new PrintWriter(new
55. // OutputStreamWriter(connection.getOutputStream(),"utf-8"));
56. dos = new DataOutputStream(conn.getOutputStream());
57. int bytesRead, bytesAvailable, bufferSize;
58. byte[] buffer;
59. int maxBufferSize = IO_BUFFER_SIZE;
60. String tem = "";
61. if(files!=null)
62. for (Map.Entry<String, File> entry : files.entrySet()){
63. // 分隔符开头
64. dos.writeBytes(TWO_HYPHENS + boundary + LINEND);
65. // create a buffer of maximum size
66. FileInputStream fileInputStream = new FileInputStream(entry.getValue());
67. bytesAvailable = fileInputStream.available();
68. bufferSize = Math.min(bytesAvailable, maxBufferSize);
69. buffer = new byte[bufferSize];
70. // read file and write it into form...
71. bytesRead = fileInputStream.read(buffer, 0, bufferSize);
72. tem = entry.getValue().getName();
73. dos.writeBytes("Content-Disposition:form-data;name=\""+entry.getKey()+"\";"+ "filename=\"");
74. dos.writeUTF(tem);// 中文的文件名使用这里
75. dos.writeBytes("\"" + LINEND);
76. dos.writeBytes("Content-Type:p_w_picpath/jpg" + LINEND + LINEND);//类型的判断暂时不处理
77. while (bytesRead > 0) {
78. dos.write(buffer, 0, bufferSize);
79. bytesAvailable = fileInputStream.available();
80. bufferSize = Math.min(bytesAvailable, maxBufferSize);
81. bytesRead = fileInputStream.read(buffer, 0, bufferSize);
82. }
83. // close streams
84. fileInputStream.close();
85. dos.writeBytes(LINEND);
86. }
87. // http 结束符
88. dos.writeBytes(TWO_HYPHENS + boundary + TWO_HYPHENS);
89. dos.writeBytes(LINEND);
90.
91. dos.flush();
92. dos.close();
93. // 返回类型
94. String responseType = conn.getHeaderField("Content-Type");
95. // 正常返回而且必须为json类型
96. if (conn.getResponseCode() == HttpURLConnection.HTTP_OK
97. && responseType != null
98. && responseType.indexOf(HTTP_JSON_TYPE) >= 0) {
99. responseType = (convertStreamToString(conn.getInputStream()));
100.
101. } else {
102. responseType = "{}";
103. }
104. try{conn.disconnect();}catch(Exception e){}
105. return new JSONObject(responseType);
106. }