/**
* 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.*@paramurl
7.*@paramfiles文件表单域
8.*@paramfields非文件表单域
9.*@returnJSONObject
10.*@throwsException
11.*@exception
12.*@since1.0.0
13.*/
14.publicstaticJSONObjectsendMultipartDataToHttpServer(URLurl,
15.finalMap<String,File>files,finalMap<String,String>fields,
16.finalUsernamePasswordCredentialscredentials)throwsIOException,JSONException,Exception{
17.URLmyurl=null;
18.StringqueryString="";
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=newURL(url.getProtocol(),url.getHost(),url.getPort(),url.getPath()
32.+queryString);
33.HttpURLConnectionconn=(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.Stringboundary="laohuidi_"+java.util.UUID.randomUUID().toString()
41.+"_laohuidi";
42.conn.setRequestProperty(
43."Accept",
44."image/gif,image/x-xbitmap,image/jpeg,image/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;WindowsNT5.2;zh-CN;rv:1.9.1.6)Gecko/20091201Firefox/3.5.6GTB6");
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.DataOutputStreamdos=newDataOutputStream(conn.getOutputStream());
54.//乱码问题可以试下PrintWriterout=newPrintWriter(new
55.//OutputStreamWriter(connection.getOutputStream(),"utf-8"));
56.dos=newDataOutputStream(conn.getOutputStream());
57.intbytesRead,bytesAvailable,bufferSize;
58.byte[]buffer;
59.intmaxBufferSize=IO_BUFFER_SIZE;
60.Stringtem="";
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.//createabufferofmaximumsize
66.FileInputStreamfileInputStream=newFileInputStream(entry.getValue());
67.bytesAvailable=fileInputStream.available();
68.bufferSize=Math.min(bytesAvailable,maxBufferSize);
69.buffer=newbyte[bufferSize];
70.//readfileandwriteitintoform...
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:image/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.//closestreams
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.StringresponseType=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(Exceptione){}
105.returnnewJSONObject(responseType);
106.}

android文件上传到服务器

http 上传文件的方法

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