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  • HTTP客户端

    import java.net.URL;
    import java.net.URLConnection;
    import java.io.InputStreamReader;
    import java.io.BufferedReader;
    import java.net.HttpURLConnection;
    
    /**
    客户端仅仅是获取服务端的信息
    */
    public class HttpClient{
        private String urlString;
        public static void main(String[] args) throws Exception{
            if(args.length!=1){
                System.out.println("控制台参数错误!");
                //终止当前运行的Java虚拟机。
                System.exit(1);
                }
            HttpClient client = new HttpClient(args[0]);
            client.run();
            }
        
        public HttpClient(String url){
            this.urlString = url;
            }
            
        private void run() throws Exception{
            URL url = new URL(this.urlString);
            URLConnection conn = url.openConnection();
            if(conn instanceof HttpURLConnection){
                HttpURLConnection httpConn = (HttpURLConnection)conn;
                String key;
                String value;
                System.out.println("The Headers");
                System.out.println("=========================================");
                for(int i=1;;i++){
                    if((key=httpConn.getHeaderFieldKey(i))==null){
                        break;
                        }
                    if((value=httpConn.getHeaderField(i))==null){
                        break;
                        }
                    System.out.println("key["+key+"]");
                    System.out.println("value["+value+"]");    
                    }
                BufferedReader reader = new BufferedReader(new InputStreamReader(httpConn.getInputStream()));
                String line;
                System.out.println("Content");
                System.out.println("=========================================");
                while((line=reader.readLine())!=null){
                    System.out.println(line);
                    }
                }
        }
    }    
    
    执行结果:
    G:maul keyboard
    etwork programming>java HttpClient http://www.google.cn
    The Headers
    =========================================
    key[Accept-Ranges]
    value[none]
    key[Vary]
    value[Accept-Encoding]
    key[Content-Type]
    value[text/html]
    key[Date]
    value[Sat, 10 Nov 2018 10:56:42 GMT]
    key[Expires]
    value[Sat, 10 Nov 2018 10:56:42 GMT]
    key[Cache-Control]
    value[private, max-age=0]
    key[Last-Modified]
    value[Thu, 08 Dec 2016 01:00:57 GMT]
    key[X-Content-Type-Options]
    value[nosniff]
    key[Server]
    value[sffe]
    key[X-XSS-Protection]
    value[1; mode=block]
    key[Transfer-Encoding]
    value[chunked]
    Content
    =========================================
    <!DOCTYPE html>
    <html lang="zh">
      <meta charset="utf-8">
      <title>Google</title>
      <style>
        html { background: #fff; margin: 0 1em; }
        body { font: .8125em/1.5 arial, sans-serif; text-align: center; }
        h1 { font-size: 1.5em; font-weight: normal; margin: 1em 0 0; }
        p#footer { color: #767676; font-size: .77em; }
        p#footer a { background: url(//www.google.cn/intl/zh-CN_cn/images/cn_icp.gif) top right no-repeat; padding: 5px 20px 5px 0; }
    ...
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  • 原文地址:https://www.cnblogs.com/celine/p/9940270.html
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