HttpURLConnection的基本使用

記錄一下HttpURLConnection的基本使用

package com.xuegu.max_library.util;

import android.util.Log;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class HttpClientUtils {

private static final String TAG = "HttpClientUtils";

public static void get(final String requestUrl, final HttpClientUtils.OnRequestCallBack callBack) {
    new Thread() {
        public void run() {
            getRequest(requestUrl, callBack);
        }
    }.start();
}

public static void post(final String requestUrl, final String params, final HttpClientUtils.OnRequestCallBack callBack) {
    new Thread() {
        public void run() {
            postRequest(requestUrl, params, callBack);
        }
    }.start();
}

private static void getRequest(String requestUrl, HttpClientUtils.OnRequestCallBack callBack) {
    boolean isSuccess = false;
    String message;

    InputStream inputStream = null;
    ByteArrayOutputStream baos = null;
    try {
        URL url = new URL(requestUrl);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        // 設定請求的方法爲"POST"，默認是GET
        connection.setRequestMethod("GET");
        connection.setConnectTimeout(50000);
        connection.setReadTimeout(50000);
        // User-Agent  IE9的標識
        connection.setRequestProperty("User-Agent", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0;");
        connection.setRequestProperty("Accept-Language", "zh-CN");
        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setRequestProperty("Charset", "UTF-8");
        /*
         * 當我們要獲取我們請求的http地址訪問的數據時就是使用connection.getInputStream().read()方式時我們就需要setDoInput(true)，
         * 根據api文檔我們可知doInput默認就是爲true。我們可以不用手動設置了，如果不需要讀取輸入流的話那就setDoInput(false)。
         * 當我們要採用非get請求給一個http網絡地址傳參 就是使用connection.getOutputStream().write() 方法時我們就需要setDoOutput(true), 默認是false
         */
        // 設置是否從httpUrlConnection讀入，默認情況下是true;
        connection.setDoInput(true);
        // 設置是否向httpUrlConnection輸出，如果是post請求，參數要放在http正文內，因此需要設爲true, 默認是false;
        //connection.setDoOutput(true);//Android  4.0 GET時候 用這句會變成POST  報錯java.io.FileNotFoundException
        connection.setUseCaches(false);
        connection.connect();//
        int contentLength = connection.getContentLength();
        Log.i("k開始讀取數據","數據長度"+contentLength);
        if (connection.getResponseCode() == 200) {
            inputStream = connection.getInputStream();//會隱式調用connect()
            baos = new ByteArrayOutputStream();
            int readLen;
            byte[] bytes = new byte[1024];
            while ((readLen = inputStream.read(bytes)) != -1) {
                baos.write(bytes, 0, readLen);
            }
            Log.i("數據讀取完成","數據長度"+contentLength);
            String result = baos.toString();
            Log.i("數據讀取完成","數據爲"+result);

// XLogUtils.i(TAG, " result:" + result);

            message = result;
            isSuccess = true;
        } else {
            message = "請求失敗 code:" + connection.getResponseCode();
        }

    } catch (MalformedURLException e) {
        message = e.getMessage();
        e.printStackTrace();
    } catch (IOException e) {
        message = e.getMessage();
        e.printStackTrace();
    } finally {
        try {
            if (baos != null) {
                baos.close();
            }
            if (inputStream != null) {
                inputStream.close();
            }
        } catch (IOException e) {
            message = e.getMessage();
            e.printStackTrace();
        }
    }
    if (isSuccess) {
        callBack.onSuccess(message);
    } else {
        callBack.onError(message);
    }
}

private static void postRequest(String requestUrl, String params, HttpClientUtils.OnRequestCallBack callBack) {
    boolean isSuccess = false;
    String message;
    InputStream inputStream = null;
    ByteArrayOutputStream baos = null;
    try {
        URL url = new URL(requestUrl);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        // 設定請求的方法爲"POST"，默認是GET
        connection.setRequestMethod("POST");
        connection.setConnectTimeout(50000);
        connection.setReadTimeout(50000);
        // User-Agent  IE9的標識
        connection.setRequestProperty("User-Agent", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0;");
        connection.setRequestProperty("Accept-Language", "zh-CN");
        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setRequestProperty("Charset", "UTF-8");

        /*
         * 當我們要獲取我們請求的http地址訪問的數據時就是使用connection.getInputStream().read()方式時我們就需要setDoInput(true)，
         * 根據api文檔我們可知doInput默認就是爲true。我們可以不用手動設置了，如果不需要讀取輸入流的話那就setDoInput(false)。
         * 當我們要採用非get請求給一個http網絡地址傳參 就是使用connection.getOutputStream().write() 方法時我們就需要setDoOutput(true), 默認是false
         */
        // 設置是否從httpUrlConnection讀入，默認情況下是true;
        connection.setDoInput(true);
        // 設置是否向httpUrlConnection輸出，如果是post請求，參數要放在http正文內，因此需要設爲true, 默認是false;
        connection.setDoOutput(true);
        connection.setUseCaches(false);

// // 現將參數寫入緩衝區等待發送
OutputStreamWriter out = new OutputStreamWriter(
connection.getOutputStream(), “UTF-8”);
// 發送請求params參數
out.write(params);
out.flush();
connection.connect();//這個時候纔是真正的將參數發送給服務器的時候.

        int contentLength = connection.getContentLength();
        if (connection.getResponseCode() == 200) {
            // 會隱式調用connect()
            inputStream = connection.getInputStream();
            baos = new ByteArrayOutputStream();
            int readLen;
            byte[] bytes = new byte[1024];
            while ((readLen = inputStream.read(bytes)) != -1) {
                baos.write(bytes, 0, readLen);
            }
            String backStr = baos.toString();

// XLogUtils.i(TAG, “backStr:” + backStr);

            message = backStr;
            isSuccess = true;
        } else {
            message = "請求失敗 code:" + connection.getResponseCode();
        }

    } catch (MalformedURLException e) {
        message = e.getMessage();
        e.printStackTrace();
    } catch (IOException e) {
        message = e.getMessage();
        e.printStackTrace();
    } finally {
        try {
            if (baos != null) {
                baos.close();
            }
            if (inputStream != null) {
                inputStream.close();
            }
        } catch (IOException e) {
            message = e.getMessage();
            e.printStackTrace();
        }
    }
    if (isSuccess) {
        callBack.onSuccess(message);
    } else {
        callBack.onError(message);
    }
}

public interface OnRequestCallBack {
    void onSuccess(String json);
    void onError(String errorMsg);
}

}