本文共 2237 字，大约阅读时间需要 7 分钟。

package com.strr.connection;import java.io.IOException;import java.net.URL;import java.net.URLConnection;import java.nio.charset.StandardCharsets;import java.util.Base64;import java.util.List;import java.util.Map;import java.util.Scanner;public class URLConnectionTest {    public static void main(String[] args) throws IOException {        String urlName;        if (args.length > 0) urlName = args[0];        else urlName = "http://horstmann.com";        URL url = new URL(urlName);        URLConnection connection = url.openConnection();        if (args.length > 2) {            String username = args[1];            String password = args[2];            String input = username + ":" + password;            Base64.Encoder encoder = Base64.getEncoder();            String encoding = encoder.encodeToString(input.getBytes(StandardCharsets.UTF_8));            connection.setRequestProperty("Authorization", "Basic" + encoding);        }        connection.connect();        Map
   
    > headers = connection.getHeaderFields();        for (Map.Entry
    
     > entry : headers.entrySet()) {            String key = entry.getKey();            for (String value : entry.getValue())                System.out.println(key + ":" + value);        }        System.out.println("----------------------");        System.out.println("getContentType: " + connection.getContentType());        System.out.println("getContentLength: " + connection.getContentLength());        System.out.println("getContentEncoding: " + connection.getContentEncoding());        System.out.println("getDate: " + connection.getDate());        System.out.println("getExpiration: " + connection.getExpiration());        System.out.println("getLastModify: " + connection.getLastModified());        System.out.println("----------------------");        String encoding = connection.getContentEncoding();        if (encoding == null)            encoding = "UTF-8";        try (Scanner in = new Scanner(connection.getInputStream(), encoding)) {            for (int n = 1; in.hasNextLine() && n <= 10; n++) {
                   System.out.println(in.nextLine());            }            if (in.hasNextLine()) {                System.out.println("...");            }        }    }}
    
   

转载地址：http://qqjqi.baihongyu.com/