import java.net.Authenticator;
import java.net.PasswordAuthentication;
import java.util.Properties;
 
public class ProxyDemo1 {
  public static void main(String[] args) {
    Properties prop = System.getProperties();
    // 設(shè)置http訪問(wèn)要使用的代理服務(wù)器的地址
    prop.setProperty("http.proxyHost", "183.45.78.31");
    // 設(shè)置http訪問(wèn)要使用的代理服務(wù)器的端口
    prop.setProperty("http.proxyPort", "8080");
    // 設(shè)置不需要通過(guò)代理服務(wù)器訪問(wèn)的主機(jī)，可以使用*通配符，多個(gè)地址用|分隔
    prop.setProperty("http.nonProxyHosts", "localhost|192.168.0.*");
    // 設(shè)置安全訪問(wèn)使用的代理服務(wù)器地址與端口
    // 它沒(méi)有https.nonProxyHosts屬性，它按照http.nonProxyHosts 中設(shè)置的規(guī)則訪問(wèn)
    prop.setProperty("https.proxyHost", "183.45.78.31");
    prop.setProperty("https.proxyPort", "443");
    // 使用ftp代理服務(wù)器的主機(jī)、端口以及不需要使用ftp代理服務(wù)器的主機(jī)
    prop.setProperty("ftp.proxyHost", "183.45.78.31");
    prop.setProperty("ftp.proxyPort", "21");
    prop.setProperty("ftp.nonProxyHosts", "localhost|192.168.0.*");
    // socks代理服務(wù)器的地址與端口
    prop.setProperty("socksProxyHost", "183.45.78.31");
    prop.setProperty("socksProxyPort", "1080");
    // 設(shè)置登陸到代理服務(wù)器的用戶名和密碼
    Authenticator.setDefault(new MyAuthenticator("userName", "Password"));
  }
 
  static class MyAuthenticator extends Authenticator {
    private String user = "";
    private String password = "";
 
    public MyAuthenticator(String user, String password) {
      this.user = user;
      this.password = password;
    }
 
    protected PasswordAuthentication getPasswordAuthentication() {
      return new PasswordAuthentication(user, password.toCharArray());
    }
  }
 
}

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.PasswordAuthentication;
import java.net.Proxy;
import java.net.URL;
 
public class ProxyDemo2 {
  public static void main(String[] args) throws Exception {
    URL url = new URL("http://www.3lai8.com");
    // /創(chuàng)建代理服務(wù)器
    InetSocketAddress addr = new InetSocketAddress("192.168.0.254", 8080);
    // Proxy proxy = new Proxy(Proxy.Type.SOCKS, addr); // Socket 代理
    Proxy proxy = new Proxy(Proxy.Type.HTTP, addr); // http 代理
    Authenticator.setDefault(new MyAuthenticator("username", "password"));// 設(shè)置代理的用戶和密碼
    HttpURLConnection connection = (HttpURLConnection) url.openConnection(proxy);// 設(shè)置代理訪問(wèn)
    InputStreamReader in = new InputStreamReader(connection.getInputStream());
    BufferedReader reader = new BufferedReader(in);
    while (true) {
      String s = reader.readLine();
      if (s != null) {
        System.out.println(s);
      }
    }
  }
 
  static class MyAuthenticator extends Authenticator {
    private String user = "";
    private String password = "";
 
    public MyAuthenticator(String user, String password) {
      this.user = user;
      this.password = password;
    }
 
    protected PasswordAuthentication getPasswordAuthentication() {
      return new PasswordAuthentication(user, password.toCharArray());
    }
  }
 
}