JavaがIPを動的に切り替える方法(一)

Windowsのrasdialコマンドを呼び出すことでipの切り替えを実現します.
rasdialの構文を見てみましょう.
ダイヤルアップ構文:rasdial接続名(任意に命名可能)『ブロードバンドアカウント』『ブロードバンドパスワード』
切断構文:rasdial接続名/disconnect
Javaコード:

package com.koy.utils;  

import java.io.BufferedReader;
import java.io.InputStreamReader;

/**
 * Created by koy.
 */
public class IpUtils {
    /**
     *   cmd  
     *
     * @param cmd windows  
     * @return     
     * @throws Exception
     */
    public static String executeCmd (String cmd) throws Exception {
        Process process = Runtime.getRuntime ().exec ("cmd /c " + cmd);
        StringBuilder executeResult = new StringBuilder ();
        BufferedReader br = new BufferedReader (new InputStreamReader (process.getInputStream ()));
        String line;
        while ((line = br.readLine ()) != null) {
            executeResult.append (line + "
");
        }
        return executeResult.toString ();
    }

    /**
     *   ADSL
     *
     * @param adslTitle   
     * @param adslName      
     * @param adlsPwd     
     * @return     
     * @throws Exception
     */
    public static boolean connAdsl (String adslTitle, String adslName, String adlsPwd) throws Exception {
        String adslCmd = "rasdial " + adslTitle + " " + adslName + " " + adlsPwd;

        return executeCmd (adslCmd).indexOf ("   ") > 0 ? true : false;
    }

    /**
     *   ADSL
     *
     * @param adslTitle   
     * @return     
     * @throws Exception
     */
    public static boolean cutAdsl (String adslTitle) throws Exception {
        String adslCmd = "rasdial " + adslTitle + " /disconnect";

        return executeCmd (adslCmd).indexOf ("    ") != -1 ? false : true;
    }

}