Android客户端上传数据到服务器：可以上传简单的表单，也可以方便的上传带有附件的文件

/**
*
*/
package com.test.phoneuibyhtmldemo;

import java.io.DataOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Map;

import org.apache.struts.upload.FormFile;

/**
* @author Administrator
*
*/
public class HttpRequester {

/**
* 直接通过HTTP协议提交数据到服务器，实现如下表单的提交功能 <FORM METHOD=POST
* ACTION="http://192.168.0.200:8080/ssi/fileload/test.do"
* enctype="multipart/form-data"> <INPUT TYPE="text" NAME="name" > <INPUT
* TYPE="text" NAME="id"> <input type="file" name="imagefile"> <input
* type="file" name="zip"> </FORM>
*
* @param actionUrl
*            上传路径(注：避免使用localhost或者127.0.0.1这样的路径测试，它会指向手机模拟器，可以使用http://
*            192.168.1.10:8080测试)
* @param params
*            key为参数名，value为参数值
* @param files
*            上传文件
* @return
*/
public static String post(String actionUrl, Map<String, String> params,
FormFile[] files) {
try {
String BOUNDARY = "----------------7da4qa4r59da";// 数据分割线
String MULTIPART_FORM_DATA = "multipart/form-data";
URL url = new URL(actionUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setConnectTimeout(5 * 1000);
conn.setDoInput(true);// 允许输入
conn.setDoOutput(true);// 允许输出
conn.setUseCaches(false);// 不使用Caches
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Charset", "UTF-8");
conn.setRequestProperty("Content-Type", MULTIPART_FORM_DATA
+ ";boundary=" + BOUNDARY);

StringBuilder sb = new StringBuilder();
for (Map.Entry<String, String> entry : params.entrySet()) {
// 构建表单字段内容
sb.append("--");
sb.append(BOUNDARY);
sb.append("\r\n");
sb.append("Content-Disposition: form-data;name=\""
+ entry.getKey() + "\"\r\n\r\n");
sb.append(entry.getValue());
sb.append("\r\n");
}

DataOutputStream outStream = new DataOutputStream(
conn.getOutputStream());
outStream.write(sb.toString().getBytes()); // 发送表单字段数据
for (FormFile file : files) {// 发送文件数据
StringBuilder splite = new StringBuilder();
splite.append("--");
splite.append(BOUNDARY);
splite.append("\r\n");
splite.append("Content-Disposition: form-data;name=\""
+ file.getFileData() + "\";filename=\""// 如有疑问，可换为file.getFormname();
+ file.getFileName() + "\"\r\n");
splite.append("Content-Type:" + file.getContentType()
+ "\r\n\r\n");
outStream.write(splite.toString().getBytes());

if (file.getInputStream() != null) {
byte[] buffer = new byte[1024];
int len = -1;
while ((len = file.getInputStream().read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
file.getInputStream().close();
} else {
outStream.write(file.getFileData(), 0,
file.getFileData().length);
}
outStream.write("'\r\n".getBytes());
}

byte[] end_data = ("--" + BOUNDARY + "--\r\n").getBytes();// 数据结束标志
outStream.write(end_data);
outStream.flush();

int cah = conn.getResponseCode();
if (cah != 200)
throw new RuntimeException("请求URL失败");
InputStream in = conn.getInputStream();
int ch;
StringBuilder b = new StringBuilder();
while ((ch = in.read()) != -1) {
b.append((char) ch);
}
outStream.close();
conn.disconnect();
return b.toString();

} catch (Exception e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}
}

/**
* 发送请求
*
* @param actionUrl
*            上传路径(注：避免使用localhost或者127.0.0.1这样的路径测试，它会指向手机模拟器，可以使用http://
*            192.168.1.10:8080测试)
* @param params
*            key为参数名，value为参数值
* @param encode
*            请求参数的编码
* @return
*/
public static byte[] post(String path, Map<String, String> params,
String encode) throws Exception {
StringBuilder paramBuilder = new StringBuilder("");
if (params != null && !params.isEmpty()) {
for (Map.Entry<String, String> entry : params.entrySet()) {
paramBuilder.append(entry.getKey()).append("=")
.append(URLEncoder.encode(entry.getValue(), encode))
.append("&");
}
paramBuilder.deleteCharAt(paramBuilder.length() - 1);
}

byte[] data = paramBuilder.toString().getBytes();
URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setUseCaches(false);// 不进行缓存
conn.setConnectTimeout(5 * 1000);
conn.setRequestMethod("POST");
// 下面设置http请求头
conn.setRequestProperty(
"Accept",
"image/gif,image/jpeg,image/pjpeg,application/x-shockwave-flash,application/xaml-xml,application/vnd.ms-xpsdocument,application/x-ms-application,application/vnd.ms-excel,application/vnd.ms-powerpoint,application/msword,*/*");
conn.setRequestProperty(
"User-Agent",
"Mozilla/4.0(compatible;MSIE 8.0;Windows NT 5.2;Trident/4.0;.NET CLR 1.1.4322;.NET CLR 2.0.50722;.NET CLR 3.0.04506.30;.NET CLR 3.0.4506.2152;.NET CLR 3.5.30729)");
conn.setRequestProperty("Content-Type",
"application/x-www-form-urlencode");
conn.setRequestProperty("Content-Length", String.valueOf(data.length));
conn.setRequestProperty("Connection", "Keep-Alive");

DataOutputStream outStream = new DataOutputStream(
conn.getOutputStream());
outStream.write(data);// 把参数发送过去
outStream.flush();
outStream.close();

if (conn.getResponseCode() == 200) {
return StreamTool.readInputStream(conn.getInputStream());
}
return null;
}

}