Android Studio的网络连接HttpURLConnection.

上篇的博客里面我说了，现在Android6.0已经将Httpclient废弃不用了，在AndroidStudio上使用的话会出现报错的情况。虽然现在在SDK中还是能找到这个类，同时使用，但是总是不方便，我们总要更新网络请求的。下面是我写的简单的HttpURLConnection请求代码。

HttpRequestUtil代码：

package com.yami.baichi.net;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.ProtocolException;import java.net.URL;import java.net.URLEncoder;import java.util.Map;import java.util.Set;/** * Created by dell on 2015/11/4. */public class HttpRequestUtil {    /**     * POST     * @param callback     * @param url     * @param params     * @param headers     */    public static void sendPostRequest(HttpResCallback callback,String url,Map<String,String> params,Map<String,String> headers){        StringBuilder buf = new StringBuilder();        Set<Map.Entry<String, String>> entrys = null;        if (params != null && !params.isEmpty()) {            entrys = params.entrySet();            for (Map.Entry<String, String> entry : entrys) {                try {                    buf.append(entry.getKey()).append("=")                            .append(URLEncoder.encode(entry.getValue(), "UTF-8"))                            .append("&");                } catch (UnsupportedEncodingException e) {                    e.printStackTrace();                }            }            buf.deleteCharAt(buf.length() - 1);        }        URL url1 = null;            try {                url1 = new URL(url);            } catch (MalformedURLException e) {                e.printStackTrace();            }        HttpURLConnection conn = null;        try {            conn = (HttpURLConnection) url1.openConnection();        } catch (IOException e) {            e.printStackTrace();        }        try {            conn.setRequestMethod("POST");        } catch (ProtocolException e) {            e.printStackTrace();        }        conn.setDoOutput(true);        OutputStream out = null;        try {            out = conn.getOutputStream();        } catch (IOException e) {            e.printStackTrace();        }        try {            out.write(buf.toString().getBytes("UTF-8"));        } catch (IOException e) {            e.printStackTrace();        }        if (headers != null && !headers.isEmpty()) {            entrys = headers.entrySet();            for (Map.Entry<String, String> entry : entrys) {                conn.setRequestProperty(entry.getKey(), entry.getValue());            }        }        try {            conn.getResponseCode(); // 为了发送成功        } catch (IOException e) {            e.printStackTrace();        }        int code = 0 ;        InputStream in = null;        String response = "";        try {            code= conn.getResponseCode();        } catch (IOException e) {            e.printStackTrace();        }        if (code == 200) {            try {                in = conn.getInputStream();                BufferedReader br = new BufferedReader(new InputStreamReader(in,"UTF-8"));                String readLine = null;                while ((readLine = br.readLine()) != null) {                    response = response + readLine;                    callback.onRespose(response);                }            } catch (IOException e) {                e.printStackTrace();            }        }else        {            response =  errorJson(code,"系统错误") ;            callback.onRespose(response) ;        }    }    public static String errorJson(int code, String errmsg)    {        StringBuffer sb = new StringBuffer();        sb.append("{");        sb.append("errno:").append(code).append(",");        sb.append("\"errmsg\":").append("\"").append(errmsg).append("\"");        sb.append("}");        return sb.toString();    }}

HttpResCallback代码：

package com.yami.baichi.net;/** * Created by dell on 2015/11/4. */public interface HttpResCallback {    public void onRespose(String response) }