Java教程

URL网络编程

本文主要是介绍URL网络编程,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!

1.URL:统一资源定位符,对应着互联网的某一资源地址

2.格式:

http://localhost:8080/examples/beauty.jpg?username=Tom

协议 主机名 端口号   资源地址    参数列表

url.getProtocol( ): 获取该URL的协议名
url.getHost( ): 获取该URL的主机名
url.getPort( ): 获取该URL的端口号
url.getPath( ): 获取该URL的文件路径
url.getFile( ): 获取该URL的文件名
url.getQuery( ): 获取该URL的查询名
    

public class URLTest1 {

public static void main(String[] args) {

HttpURLConnection urlConnection = null;
InputStream is = null;
FileOutputStream fos = null;
try {
URL url = new URL("http://localhost:8080/examples/beauty.jpg");

urlConnection = (HttpURLConnection) url.openConnection();

urlConnection.connect();

is = urlConnection.getInputStream();
fos = new FileOutputStream("day10\\beauty3.jpg");

byte[] buffer = new byte[1024];
int len;
while((len = is.read(buffer)) != -1){
fos.write(buffer,0,len);
}

System.out.println("下载完成");
} catch (IOException e) {
e.printStackTrace();
} finally {
//关闭资源
if(is != null){
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(fos != null){
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(urlConnection != null){
urlConnection.disconnect();
}
}
}


public static void main(String[] args) {

HttpURLConnection urlConnection = null;
InputStream is = null;
FileOutputStream fos = null;
try {
URL url = new URL("http://localhost:8080/examples/beauty.jpg");

urlConnection = (HttpURLConnection) url.openConnection();

urlConnection.connect();

is = urlConnection.getInputStream();
fos = new FileOutputStream("day10\\beauty3.jpg");

byte[] buffer = new byte[1024];
int len;
while((len = is.read(buffer)) != -1){
fos.write(buffer,0,len);
}

System.out.println("下载完成");
} catch (IOException e) {
e.printStackTrace();
} finally {
//关闭资源
if(is != null){
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(fos != null){
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(urlConnection != null){
urlConnection.disconnect();
}
}
}
}

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