HttpURLConnection

Http学习之使用HttpURLConnection发送post和get请求

HttpURLConnection用法详解

使用HttpURLConnection发送post和get请求

android httpUrlConnection 设置cookies

HttpURLConnection实现断点下载

Http学习之使用HttpURLConnection发送post和get请求 异步

HttpURLConnection请求时使用CookieHandler,CookieManager和CookieStore获取Cookie

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HttpURLConnection与 CookieManager 实现Post提交请求和Cookie管理

注：应用HttpURLConnection有个大Bug，无法解决，就是报以下错k误时是没办法解决的，平时用都没问题，哪天报这种Bug时就玩完。

java.net.ProtocolException: Connection already established

本人的源码如下：

package utility;

import android.content.Context;
import android.graphics.BitmapFactory;
import android.os.Handler;

import com.heiyouhui.m.Flag;

import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;

/**
 * Author: jamky
 * Date: 2015/6/11
 * Description: 主要应用于网络请求
 */
public class HttpUtils {

    /**
     * Http 远程请求
     * @param context 非null时表示请求保持cookie同步,cookie的expires为17位utc时间格式
     * @param url 可决定是否编码后再传过来， URLEncoder.encode("paramValue", "utf-8");
     * @param requestMethod 请求方式：Flag.HTTP_GET ， Flag.HTTP_POST
     * @param requestType 请求返回数据的类型：Flag.STRING ， Flag.BITMAP， Flag.DOC
     * @param timeout 链接超时与读取超时，单位为秒
     * @param handle 异步回调主体，常见代码： @Override handleMessage(Message msg); if (msg.what == 1); new Boolean(msg.obj.toString()).booleanValue();  new JSONObject(msg.obj.toString()); .setImageDrawable(new BitmapDrawable((Bitmap) msg.obj))
     */
    public static void  Request(final Context context,
                                final String url,
                                final int requestMethod,
                                final int requestType,
                                final int[] timeout,
                                final Handler handle){
        new Thread(){
            @Override
            public void run() {
                try {
                    Object object = Request(context,url,requestMethod,requestType,timeout);
                    handle.obtainMessage(1, object).sendToTarget();
                }catch (Exception e) {
                    handle.obtainMessage(0, null).sendToTarget();
                }
            }
        }.start();
    }

    public static Object Request(final Context context,
                                 final String url,
                                 final int requestMethod,
                                 final int requestType,
                                 final int[] timeout) throws Exception {
        HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();

        //链接超时与读取超时
        if (null!=timeout&&timeout.length>1){
            conn.setConnectTimeout(timeout[0]*1000);
            conn.setReadTimeout(timeout[1]*1000);
        }

        //POST请求配置
        if (requestMethod == Flag.HTTP_POST){
            conn.setRequestMethod("POST");//[OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE]
            conn.setDoOutput(true);
            conn.setUseCaches(false);
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

            //设置请求跟随重定向，如请求A，A跳转到B，A会返回302状态码，设置些跟随后获取到的状态码是200
            //HttpURLConnection.setFollowRedirects(true);//作用于应用程序所有实例
            conn.setInstanceFollowRedirects(true);//作用于当前实例
            // 以上这些要在conn.connect()之前设置
        }

        //Cookie同步
        if (null != context) {
            //读cookie,绑定到请求，使会话持久化
            String cookiesStr = WebViewCookie.G(context, url);
            if (null != cookiesStr)
                conn.setRequestProperty("Cookie", cookiesStr);

            //写Cookie到本地Cookies数据库
            if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
                Map<String, List<String>> maps = conn.getHeaderFields();
                List<String> cookies = maps.get("Set-Cookie");
                if (null != cookies)
                    WebViewCookie.C(context, cookies, url);
            }
        }

        // 进行连接，实际上当执行到connection.getInputStream()时才真正地发出请求
        conn.connect();

        //请求若是POST
        if (requestMethod == Flag.HTTP_POST){
/*                      //post参数注入。实际测试post的参数直接追加在url后也是可以的
                    //另外，要注意的是connection.getOutputStream会隐含的进行conn.connect()，故post请求时conn.connect()也可以注释掉
                    DataOutputStream out = new DataOutputStream(conn.getOutputStream());
                    String url_param = "param=" + URLEncoder.encode("参数值", "utf-8");
                    out.writeBytes(url_param);// 将字符串中的16位unicode字符以8位字符形式写入流
                    out.flush();
                    out.close();*/
        }

        Object object = null;
        switch (requestType){
            case Flag.BITMAP:
                object = BitmapFactory.decodeStream(conn.getInputStream());
                break;
            default:
                BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()) );
                String s;
                StringBuilder builder = new StringBuilder();
                while ((s = reader.readLine())!= null) builder.append(s);
                reader.close();
                object = requestType==Flag.JSON? new JSONObject(builder.toString()) : builder.toString();
        }
        conn.disconnect();
        return  object;
    }


}