【安卓学习笔记】HTTP请求——HttpURLConnection

主要知识点：

• 两种方式——GET、POST

• 获取的是inputStream字节流，在显示时，纯文本要先转换为字符流，其他的以字节流进行处理。

GET方式：

//path格式：http://网址?aaa=xxx&bbb=xxx
public InputStream getData(String path) throws Exception {

            URL url = new URL(path);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setConnectTimeout(5000);
            conn.setReadTimeout(5000);
            conn.setRequestMethod("GET");

            if (conn.getResponseCode() == 200) {
                InputStream is = conn.getInputStream();
                return is;

            } 
            return null;
}

POST方式：

//path是网址，data格式为：aaa=xxx&bbb=xxx
public InputStream postData(String path,String data) throws Exception{
            
            URL url = new URL(path);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setConnectTimeout(5000);
            conn.setReadTimeout(5000);
            //比GET方式多出来的设置
            conn.setDoInput(true);
            conn.setDoOutput(true);
            conn.setUseCaches(false);//post方式不能缓存
            if (conn.getResponseCode() == 200) {
                OutputStream os = conn.getOutputStream();
                os.write(data.getBytes());
                InputStream is = conn.getInputStream();
                os.close();
                return is;
            }
            return null;
}