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();    // 設置http訪問要使用的代理服務器的地址    prop.setProperty("http.proxyHost", "183.45.78.31");    // 設置http訪問要使用的代理服務器的端口    prop.setProperty("http.proxyPort", "8080");    // 設置不需要通過代理服務器訪問的主機，可以使用*通配符，多個地址用|分隔    prop.setProperty("http.nonProxyHosts", "localhost|192.168.0.*");    // 設置安全訪問使用的代理服務器地址與端口    // 它沒有https.nonProxyHosts屬性，它按照http.nonProxyHosts 中設置的規則訪問    prop.setProperty("https.proxyHost", "183.45.78.31");    prop.setProperty("https.proxyPort", "443");    // 使用ftp代理服務器的主機、端口以及不需要使用ftp代理服務器的主機    prop.setProperty("ftp.proxyHost", "183.45.78.31");    prop.setProperty("ftp.proxyPort", "21");    prop.setProperty("ftp.nonProxyHosts", "localhost|192.168.0.*");    // socks代理服務器的地址與端口    prop.setProperty("socksProxyHost", "183.45.78.31");    prop.setProperty("socksProxyPort", "1080");    // 設置登陸到代理服務器的用戶名和密碼    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");    // /創建代理服務器    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"));// 設置代理的用戶和密碼    HttpURLConnection connection = (HttpURLConnection) url.openConnection(proxy);// 設置代理訪問    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());    }  } }