Java基础进阶网络编程-URL

偏执的太偏执、 2023-10-08 16:54 78阅读 0赞

URL网络编程

*  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

#### 示例代码01： ####

public class UrlTest01 {
        
        public static void main(String[] args) {
        
    
            try {
        
                    URL url = new URL("http://localhost:8080/examples/beauty.jpg?username=Tom");
    
    //            public String getProtocol(  )     获取该URL的协议名
                    System.out.println(url.getProtocol());
    //            public String getHost(  )           获取该URL的主机名
                    System.out.println(url.getHost());
    //            public String getPort(  )            获取该URL的端口号
                    System.out.println(url.getPort());
    //            public String getPath(  )           获取该URL的文件路径
                    System.out.println(url.getPath());
    //            public String getFile(  )             获取该URL的文件名
                    System.out.println(url.getFile());
    //            public String getQuery(   )        获取该URL的查询名
                    System.out.println(url.getQuery());
    
    
    
    
                } catch (MalformedURLException e) {
        
                    e.printStackTrace();
                }
    
        }
    
    
        }

#### 运行结果： ####

![在这里插入图片描述][fc887936ef824b59ab8db6c6268bbce9.png]

#### 示例代码02： ####

public class UrlTest02 {
        
    
        public static void main(String[] args) throws Exception {
        
    
            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();
                }
            }
        }
    }

[fc887936ef824b59ab8db6c6268bbce9.png]: https://img-blog.csdnimg.cn/fc887936ef824b59ab8db6c6268bbce9.png