使用java调用http请求系列--URLConnection

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简介：使用URLConnection实现了调用http请求，该方法不支持调用https请求。https调用方式可查看：HttpURLConnection实现和HttpClient实现

1.使用GET方式调用http请求代码：

    public static String requestHttpGet(String url,String params){        String result = "";        try {            if (StringUtil.isNotEmpty(params)){                //如果有参数，将参数写入                url += "?"+params;            }            URL requestUrl = new URL(url);            URLConnection connection = requestUrl.openConnection();            //设置是否使用缓存            connection.setUseCaches(false);            connection.setConnectTimeout(100000);            connection.setReadTimeout(100000);            InputStream in = connection.getInputStream();            BufferedReader reader = new BufferedReader(new InputStreamReader(in, "utf-8"));            String line = null;            while ((line=reader.readLine())!=null){                result += line;            }        }catch (Exception e){            e.printStackTrace();        }        return result;    }

2.使用POST方式调用http请求代码：

    public static String requestHttpPost(String url,String params){        String result = "";        try {            URL requestUrl = new URL(url);            URLConnection connection = requestUrl.openConnection();            //设置是否使用缓存            connection.setUseCaches(false);            connection.setConnectTimeout(100000);            connection.setReadTimeout(100000);            if (StringUtil.isNotEmpty(params)){                //如果有参数，将参数写入                connection.setDoOutput(true);                connection.getOutputStream().write(params.getBytes("utf-8"));            }            InputStream in = connection.getInputStream();            BufferedReader reader = new BufferedReader(new InputStreamReader(in, "utf-8"));            String line = null;            while ((line=reader.readLine())!=null){                result += line;            }        }catch (Exception e){            e.printStackTrace();        }        return result;    }

3.测试代码：

    public static void main(String[] args) {        String url = "http://www.baidu.com";        System.out.println(requestHttpGet(url,null));        System.out.println(requestHttpPost(url,null));    }

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