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);
通过协议名、主机名、文件名构造一个URL对象。
new URL("http","http://my.oschina.net","/u/2308739/admin/new-blog.html";
- public URL(String protocol,String host,int port,String file);
通过协议名、主机名、端口号，文件名构造一个URL对象。
new URL("http","http://my.oschina.net",80,"/u/2308739/admin/new-blog.html");
2.实例通过URL读内容
测试代码：
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();
}
}
输出结果：
<!DOCTYPE html>
<html xmlns:wb="http://open.weibo.com/wb">
...
</html>
3.实例通过URLConnection读内容
测试代码：
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();
}
}
输出结果：
<!DOCTYPE html>
<html xmlns:wb="http://open.weibo.com/wb">
...
</html>
4.实例通过URLConnection写内容
测试代码：
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();
// 设置doOutput属性为true表示将使用此urlConnection写入数据
urlConnection.setDoOutput(true);
// 定义待写入数据的内容类型，我们设置为application/x-www-form-urlencoded类型
urlConnection.setRequestProperty("content-type", "application/x-www-form-urlencoded");
HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;//httpurlconection 有可以获得返回状态值的方法。
/** httpurlconnetion一些配置属性 **/
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()));
// 得到请求的输出流对象
OutputStreamWriter out = new OutputStreamWriter(httpURLConnection.getOutputStream());
// 把数据写入请求的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());
}
// 从服务器读取响应
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);
}
}
输出结果：
ResponseCode:500
HTTP Request is not success, Response code is 500
...
由于网站不再更新，请求会报错。。。
补充：
关于URL和URI的详细介绍：https://www.cnblogs.com/throwable/p/9740425.html
参考文章：https://my.oschina.net/u/2308739/blog/410562