安卓处理文件上传,

例子是从网上找来着,原理不难理解,就不去抓包再模拟上传了毕竟现在在赶着项目,所以很是谢谢原作者（不知是谁的,好东西总被转载多次,所以就在这里感谢原作者,呵呵）,主要是注意对应file的name要与实际中input的name对应上,特别是用框架处理上传文件时,如我现在使用的是struct处理多文件上传,当然还可以json返回进度

public class FilePostTest {
//传递文件
public String FilePost(String url, Map<String, String> params, Map<String, File> files) throws IOException{
String BOUNDARY = java.util.UUID.randomUUID().toString();//uuid产生分隔符
String PREFIX = "--", LINEND = "\r\n";
String MULTIPART_FROM_DATA = "multipart/form-data";
String CHARSET = "UTF-8";
URL uri = new URL(url);
HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
conn.setReadTimeout(10 * 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)
for (Map.Entry<String, File> file : files.entrySet()) {
StringBuilder sb1 = new StringBuilder();
sb1.append(PREFIX);
sb1.append(BOUNDARY);
sb1.append(LINEND);//name不一定要文件的名字而要与服务器框架的input file中的name对应,否则就会oom
sb1.append("Content-Disposition: form-data; name=\"strutsUploads\"; filename=\"" + file.getValue().getName() + "\"" + 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 = conn.getInputStream();
StringBuilder sb2 = new StringBuilder();
if (res == 200) {
int ch;
while ((ch = in.read()) != -1) { sb2.append((char) ch);}
}
outStream.close();
conn.disconnect();
return sb2.toString();
}
@org.junit.Test
public void TestPostFile() throws IOException{
final Map<String, String> params = new HashMap<String, String>();//实际时我们会用json或者序列化的方式提交参数的，这里只是测试
params.put("send_userId", String.valueOf(123));
params.put("send_email", "address");
params.put("send_name", "name");
params.put("receive_email", "2637309949@qq.com");//我的qq,欢迎喜欢写代码的朋友...

final Map<String, File> files = new HashMap<String, File>();
files.put("uploadfile", new File("C:/33.jpg"));
final String request = FilePost("http://localhost:8080/HaCompus/uploadFile.action", params, files);
}
}