Go语言视频零基础入门到精通

yweii

1. 简单版本

java代码： /**

* 根据URL下载文件，前提是这个文件当中的内容是文本，函数的返回值就是文件当中的内容 1.创建一个URL对象

* 2.通过URL对象，创建一个HttpURLConnection对象 3.得到InputStram 4.从InputStream当中读取数据

*

* @param urlStr

* @return

*/

public String getTextFromUrl(String urlStr) {

StringBuffer sb = new StringBuffer();

String line = null;

BufferedReader buffer = null;

try {

// 创建一个URL对象

url = new URL(urlStr);

// 创建一个Http连接

HttpURLConnection urlConn = (HttpURLConnection) url

.openConnection();

// 使用IO流读取数据

buffer = new BufferedReader(new InputStreamReader(

urlConn.getInputStream()));

while ((line = buffer.readLine()) != null) {

sb.append(line);

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

buffer.close();

} catch (Exception e) {

e.printStackTrace();

}

}

return sb.toString();

}
复制代码2. 发送http信息，并信息进行编码

java代码： //发送http信息，并信息进行编码

public String SendDataPost(String url, String post)

{

// 判断网络链接是否正常

if (isNetworkAvailable(fromcon)) {

try

{

String mString = new String(post.getBytes(), “UTF-8″);

URL iurl = new URL(url);//直接提交地址，不要带参数

HttpURLConnection objConn = (HttpURLConnection)iurl.openConnection();

//objConn.setRequestProperty(“Cookie”,HttpTools.PublishCookies());

objConn.setDoOutput(true);

objConn.setDoInput(true);

objConn.setRequestProperty(“Content-type”,”application/x-www-form-urlencoded”);

objConn.setRequestMethod(“POST”);

objConn.setRequestProperty(“Content-Length”,String.valueOf(mString.toCharArray().length));

objConn.setConnectTimeout(30000);

objConn.setReadTimeout(30000);

objConn.connect();

OutputStream objSM = objConn.getOutputStream();

OutputStreamWriter objSW = new OutputStreamWriter(objSM);

BufferedWriter out = new BufferedWriter(objSW);

out.write(mString.toCharArray(),0,mString.toCharArray().length);

out.flush();

out.close();

InputStream objSMP = objConn.getInputStream();

InputStreamReader objSRP = new InputStreamReader(objSMP, “utf-8″);

BufferedReader in = new BufferedReader(objSRP);

String line = null;

StringBuilder sb = new StringBuilder();

while ((line = in.readLine()) != null) {

sb.append(line);

}

in.close();

String resp = sb.toString();

objSMP.close();

objConn.disconnect();

return resp;

}catch (Exception ex) {

Log.i(“CCCC”, ex.toString());

return “”;

}

}else{

Intent intent0 = new Intent(fromcon,LoginActivity.class);

intent0.putExtra(“msg”,“您当前网络连接已禁用，请重新设置!”);

fromcon.startActivity(intent0);

return “”;

}

}

// 判断网络是否正常

public static boolean isNetworkAvailable(Context context) {

ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

if (connectivity == null) {

return false;

} else {

NetworkInfo info = connectivity.getActiveNetworkInfo();

if (info == null) {

return false;

} else {

if (info.isAvailable()) {

return true;

}

}

}

return false;

}
复制代码