Android 网络操作（下传上载等）

package com.maidong.utils;import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLConnection;import java.net.URLDecoder;import java.net.URLEncoder;import java.util.ArrayList;import java.util.List;import java.util.Map;import org.apache.http.HttpEntity;import org.apache.http.NameValuePair;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.protocol.HTTP;import android.app.Activity;import android.content.Context;import android.net.ConnectivityManager;import android.net.NetworkInfo;public class InternetUtils {	private static final String USER_AGENT = "User-Agent";	public static String httpPost(String url, List<NameValuePair> nameValuePairs) throws ClientProtocolException, IOException {		HttpClient httpclient = new DefaultHttpClient();		HttpPost httpPost = new HttpPost(url);		// List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);		// Your DATA		// nameValuePairs.add(new BasicNameValuePair("id", "12345"));		// nameValuePairs.add(new BasicNameValuePair("stringdata",		// "eoeAndroid.com is Cool!"));		httpPost.setHeader(USER_AGENT, "Mozilla/4.5");		HttpEntity httpEntity = null;		try {			httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, HTTP.UTF_8));			httpEntity = httpclient.execute(httpPost).getEntity();		} finally {			//httpPost.abort();		}		return retrieveHttpEntity(httpEntity);	}	public static InputStream download(URL url) throws IOException {		URLConnection conn = url.openConnection();		InputStream is = conn.getInputStream();		return is;	}	public static byte[] downloadFileData(String surl) throws IOException {		URL url = new URL(surl);		URLConnection conn = url.openConnection();		// 获取长度		int length = (int) conn.getContentLength();		InputStream is = conn.getInputStream();		byte[] imgData = null;		if (length != -1) {			imgData = new byte[length];			byte[] temp = new byte[512];			int readLen = 0;			int destPos = 0;			while ((readLen = is.read(temp)) > 0) {				System.arraycopy(temp, 0, imgData, destPos, readLen);				destPos += readLen;			}		}		return imgData;	}	public static InputStream download(String url) throws IOException {		return download(new URL(url));	}	public static String httpPost(String url) throws ClientProtocolException, IOException {		return httpPost(url, new ArrayList<NameValuePair>());	}	private static String retrieveHttpEntity(HttpEntity httpEntity) throws UnsupportedEncodingException, IllegalStateException,			IOException {		StringBuffer stringBuffer = new StringBuffer();		InputStreamReader is = new InputStreamReader(httpEntity.getContent(), HTTP.UTF_8);		BufferedReader bufferedReader = new BufferedReader(is);		String line;		while ((line = bufferedReader.readLine()) != null) {			stringBuffer.append(line);		}		return stringBuffer.toString();	}	public static String uploadFile(String actionUrl, String newName, InputStream fStream) {		String end = "\r\n";		String twoHyphens = "--";		String boundary = java.util.UUID.randomUUID().toString();		DataOutputStream ds = null;		try {			URL url = new URL(actionUrl);			HttpURLConnection con = (HttpURLConnection) url.openConnection();			/* 允许Input、Output，不使用Cache */			con.setDoInput(true);			con.setDoOutput(true);			con.setUseCaches(false);			/* 设定传送的method=POST */			con.setRequestMethod("POST");			/* setRequestProperty */			con.setRequestProperty("Connection", "Keep-Alive");			con.setRequestProperty("Charset", "UTF-8");			con.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);			/* 设定DataOutputStream */			ds = new DataOutputStream(con.getOutputStream());			ds.writeBytes(twoHyphens + boundary + end);			ds.writeBytes("Content-Disposition: form-data; " + "name=\"Filedata\";filename=\"" + newName + "\"" + end);			ds.writeBytes(end);			/* 取得文件的FileInputStream */			// FileInputStream fStream = new FileInputStream(uploadFile);			/* 设定每次写入1024bytes */			int bufferSize = 1024;			byte[] buffer = new byte[bufferSize];			int length = -1;			/* 从文件读取数据到缓冲区 */			while ((length = fStream.read(buffer)) != -1) {				/* 将数据写入DataOutputStream中 */				ds.write(buffer, 0, length);			}			ds.writeBytes(end);			ds.writeBytes(twoHyphens + boundary + twoHyphens + end);			ds.flush();			/* 取得Response内容 */			InputStream is = con.getInputStream();			int ch;			StringBuffer b = new StringBuffer();			while ((ch = is.read()) != -1) {				b.append((char) ch);			}			/* 将Response显示于Dialog */			// showDialog(b.toString().trim());			return b.toString().trim();			/* 关闭DataOutputStream */		} catch (Exception e) {			// showDialog("" + e);		} finally {			AppUtils.close(ds);			AppUtils.close(fStream);		}		return null;	}	/**	 * 	 * @param s	 * @return null if the given string is null.	 * @throws UnsupportedEncodingException	 */	public static String decode(String s, String enc) throws UnsupportedEncodingException {		return s == null ? null : URLDecoder.decode(s, enc);	}	public static String encode(String s, String enc) throws UnsupportedEncodingException {		return URLEncoder.encode((s == null ? "" : s), enc);	}	/**	 * 	 * 判断网络状态是否可用	 * 	 * @return true: 网络可用 ; false: 网络不可用	 */	public static boolean isNetworkConnected(Activity activity) {		ConnectivityManager conManager = (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);		NetworkInfo networkInfo = conManager.getActiveNetworkInfo();		if (networkInfo != null) { // 这个判断一定要，要不然会出错			return networkInfo.isAvailable();		}		return false;	}}