Android Http网络数据传输备忘

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

public class HttpTool {
    private static int TIME_OUT = 1000 * 6;
    private static String POST = "POST";
    private static String GET = "GET";
    private static String UTF8 = "UTF-8";
    public static void downloadGET(String path) throws Exception{
        URL url = new URL(path);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setReadTimeout(TIME_OUT);
        connection.setRequestMethod(GET);
        connection.setUseCaches(false);
        connection.connect();
        if(connection.getResponseCode() != 200){
            throw new RuntimeException("ResponseCode != 200");
        }
        InputStream inputStream = connection.getInputStream();
        File file = new File(rename(path));
        FileOutputStream fileOutputStream = new FileOutputStream(file);
        readinput(inputStream, fileOutputStream);
        connection.disconnect();
        System.out.println("ok");
    }
    public static void downloadPOST(String path,Map<String, String> params) throws Exception{
        URL url = new URL(path);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setReadTimeout(TIME_OUT);
        connection.setRequestMethod(POST);
        connection.setUseCaches(false);
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setRequestProperty("Accept-Charset", UTF8);
        connection.setRequestProperty("Connection", "keep-alive");
        connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset="+UTF8);
        StringBuilder sb = new StringBuilder();
        if(params != null){
            for(Map.Entry<String, String> item : params.entrySet()){
                sb.append(item.getKey()+"="+item.getValue()).append("&");
            }
            sb = sb.deleteCharAt(sb.length()-1);
            byte[] data = sb.toString().getBytes();
            connection.setRequestProperty("Content-Length",String.valueOf(data.length));
            OutputStream outputStream = connection.getOutputStream();
            outputStream.write(data);
            outputStream.flush();
            outputStream.close();
        }
        if(connection.getResponseCode() != 200){
            throw new RuntimeException("ResponseCode != 200");
        }
        InputStream inputStream = connection.getInputStream();
        BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
        byte[] buffer = new byte[1024];
        int len = -1;
        ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
        while((len = bufferedInputStream.read(buffer)) != -1){
            arrayOutputStream.write(buffer, 0, len);
        }
        byte[] bytes = arrayOutputStream.toByteArray();
        String str = new String(bytes,UTF8);
        arrayOutputStream.close();
        bufferedInputStream.close();
        connection.disconnect();
        System.out.println(str);
    }
    
    /**
     * 读取输入流
     * @param inputStream
     * @param fileOutputStream
     * @throws Exception
     */
    private static void readinput(InputStream inputStream,FileOutputStream fileOutputStream) throws Exception{
        BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
        BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
        byte[] buffer = new byte[1024];
        int len = -1;
        while((len = bufferedInputStream.read(buffer)) != -1){
            bufferedOutputStream.write(buffer, 0, len);
        }
        bufferedOutputStream.close();
        bufferedInputStream.close();
    }
    /**
     * 重名名
     * @param path
     * @return
     */
    public static String rename(String path){
        String str = path.substring(path.lastIndexOf("."));
        return new SimpleDateFormat("yyyyMMddHHmmssS").format(new Date())+str;
    }