Android之HttpURLConnection的GET和POST请求

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GET请求

 public static String requestByGet(Context context,String path) throws Exception{        String data = "";        // 新建一个URL对象        URL url = new URL(path);        // 打开一个HttpURLConnection连接        HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();        // 设置连接超时时间        urlConn.setConnectTimeout(3 * 1000);        // 开始连接        urlConn.connect();        // 判断请求是否成功        if (urlConn.getResponseCode() == 200) {            // 获取返回的数据        data = IOUtils.getTextFromStream(urlConn.getInputStream());        } else {            ToastUtil.showShort(context,"请求失败");        }        // 关闭连接        urlConn.disconnect();        return data;    }

POST请求

public static String requestByPost(Context context,String path)throws Exception{        String data = "";        String params = "name="+ URLEncoder.encode("username", "UTF-8")                + "&password=" + URLEncoder.encode("password", "UTF-8");        byte[] postData = params.getBytes();        // 新建一个URL对象        URL url = new URL(path);        // 打开一个HttpURLConnection连接        HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();        // 设置连接超时时间        urlConn.setConnectTimeout(3 * 1000);        // Post请求必须设置允许输出        urlConn.setDoOutput(true);        // Post请求不能使用缓存        urlConn.setUseCaches(false);        // 设置为Post请求        urlConn.setRequestMethod("POST");        urlConn.setInstanceFollowRedirects(true);        // 配置请求Content-Type        urlConn.setRequestProperty("Content-Type","application/x-www-form-urlencode");        // 开始连接        urlConn.connect();        // 发送请求参数        DataOutputStream dos = new DataOutputStream(urlConn.getOutputStream());        dos.write(postData);        dos.flush();        dos.close();        // 判断请求是否成功        if (urlConn.getResponseCode() == 200) {            // 获取返回的数据            data = IOUtils.getTextFromStream(urlConn.getInputStream());        } else {            ToastUtil.showShort(context,"请求失败");        }        return data;    }

其中的ToastUtil是一个Toast的自定义基类：

public class ToastUtil {    public static void showShort(Context context,String content){        Toast.makeText(context, content, Toast.LENGTH_SHORT).show();    }    public static void showLong(Context context,String content){        Toast.makeText(context, content, Toast.LENGTH_LONG).show();    }    public static void showShort(Context context,int contentId){        Toast.makeText(context, contentId, Toast.LENGTH_SHORT).show();    }    public static void showLong(Context context,int contentId){        Toast.makeText(context, contentId, Toast.LENGTH_LONG).show();    }}

IOutils为解析InputStream的一个工具类：

public class IOUtils {    public static String getTextFromStream(InputStream inputStream){        byte[] b = new byte[1024];        int len = 0;        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();        try {            while ((len = inputStream.read(b))!=-1){                byteArrayOutputStream.write(b,0,len);            }            String text = new String(byteArrayOutputStream.toByteArray());            return text;        } catch (IOException e) {            e.printStackTrace();        }        return null;    }}

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