Android网络操作（上传下载等）

Java代码
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);

补充：移动开发 , Android ,