1.URL的初始化
- public URL(String spec);
URL urlbase=new URL("http://my.oschina.net/u/2308739/admin/new-blog.html");
- public URL(URL context,String spec);
URL urlbase=new URL("http://my.oschina.net/u/2308739/admin/");
URL indexUrl=new URL(urlbase,"new-blog.html");
- public URL(String protocol,String host,String file);
通過協議名、主機名、文件名構造一個URL對象。
new URL("http","http://my.oschina.net","/u/2308739/admin/new-blog.html";
- public URL(String protocol,String host,int port,String file);
通過協議名、主機名、端口號，文件名構造一個URL對象。
new URL("http","http://my.oschina.net",80,"/u/2308739/admin/new-blog.html");
2.實例通過URL讀內容
測試代碼：
public static void main(String[] args) {
try {
URL ifeng=new URL("http://www.ifeng.com/");
BufferedReader bReader=new
BufferedReader(new InputStreamReader(ifeng.openStream()));
String inputLineString;
while((inputLineString=bReader.readLine())!=null){
System.out.println(inputLineString);
}
bReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
輸出結果：
<!DOCTYPE html>
<html xmlns:wb="http://open.weibo.com/wb">
...
</html>
3.實例通過URLConnection讀內容
測試代碼：
public static void main(String[] args) {
try {
URL ifeng = new URL("http://www.ifeng.com/");
URLConnection urlConnection = ifeng.openConnection();
BufferedReader bReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
String inputLineString;
while ((inputLineString = bReader.readLine()) != null) {
System.out.println(inputLineString);
}
bReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
輸出結果：
<!DOCTYPE html>
<html xmlns:wb="http://open.weibo.com/wb">
...
</html>
4.實例通過URLConnection寫內容
測試代碼：
public static void main(String[] args) {
try {
// Configure and open a connection to the site you will send the request
URL url = new URL("http://wx.tclha.com/login.do");
URLConnection urlConnection = url.openConnection();
// 設置doOutput屬性爲true表示將使用此urlConnection寫入數據
urlConnection.setDoOutput(true);
// 定義待寫入數據的內容類型，我們設置爲application/x-www-form-urlencoded類型
urlConnection.setRequestProperty("content-type", "application/x-www-form-urlencoded");
HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;//httpurlconection 有可以獲得返回狀態值的方法。
/** httpurlconnetion一些配置屬性 **/
httpURLConnection.setDoOutput(true);
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");
httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
// httpURLConnection.setRequestProperty("Content-Length", String.valueOf(parameterData.length()));
// 得到請求的輸出流對象
OutputStreamWriter out = new OutputStreamWriter(httpURLConnection.getOutputStream());
// 把數據寫入請求的Body
out.write("userName=yuanw&passWord=121212");
out.flush();
out.close();
System.out.println("ResponseCode:" + httpURLConnection.getResponseCode());
if (httpURLConnection.getResponseCode() >= 300) {
System.out.println("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
}
// 從服務器讀取響應
InputStream inputStream = urlConnection.getInputStream();
String encoding = urlConnection.getContentEncoding();
System.out.println("encoding:" + encoding);
String body = IOUtils.toString(inputStream, "utf-8");
System.out.println(body);
} catch (IOException e) {
Logger.getLogger(this.getClass().getName()).log(Level.SEVERE, null, e);
}
}
輸出結果：
ResponseCode:500
HTTP Request is not success, Response code is 500
...
由於網站不再更新，請求會報錯。。。
補充：
關於URL和URI的詳細介紹：https://www.cnblogs.com/throwable/p/9740425.html
參考文章：https://my.oschina.net/u/2308739/blog/410562