Java

URL url = new URL(protocol, hostname, port, file);

HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true);    // Input OK
conn.setDoOutput(true);   // Output OK
conn.setUseCaches(false); // Cache NG
conn.setRequestProperty("Content-type",
        "application/x-www-form-urlencoded");
conn.connect();           // Connect

boolean isRedirect = HttpURLConnection.getFollowRedirects();

String cookieValue = null;
try {
    Map<String, List<String>> headers = conn.getHeaderFields();
    List<String> values = headers.get("Set-Cookie");
    for (Iterator<String> iter = values.iterator(); iter.hasNext();) {
        String v = iter.next();
        if (cookieValue == null)
            cookieValue = v;
        else
            cookieValue = cookieValue + ";" + v;
    }
} catch (Exception e) {
}
System.out.println(this.getClass().getName()
        + ": cookieValue: " + cookieValue);

e.printStackTrace();
return false;

StringBuffer s = new StringBuffer();
for (int i = 0; i < b.length; i++) {

    int d = b[i];
    d += d < 0 ? 256 : 0; // byte 128-255
    if (d < 16) { //0-15 16
        s.append("0");
    }
    s.append(Integer.toString(d, 16));
}
return s.toString();

if (b == null || b.length <= 0) return null;
byte ch = 0x00;
String pseudo[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
StringBuffer s = new StringBuffer(b.length * 2);

for(int i = 0; i < b.length; i++) {

    ch = (byte) (b[i] & 0xf0);
    ch = (byte) (ch >>> 4);
    ch = (byte) (ch & 0x0f);
    s.append(pseudo[(int) ch]);
    ch = (byte) (b[i] & 0x0f);
    s.append(pseudo[(int) ch]);
}
return s.toString();

public static final String HASH_ALGORITHM = "SHA1";

public static final String password = "password";

public static void main(String[] args){

    try {
        password =  this.getDigest(password);
    } catch(Exception e) {

    }
}

public String getDigest(String data) throws Exception {

    StringBuffer s = new StringBuffer();
    MessageDigest md = MessageDigest.getInstance(HASH_ALGORITHM);
    byte[] dat = data.getBytes();
    md.update(dat);

    byte[] digest = md.digest();
    for (int i = 0; i < digest.length; i++) {
        int d = digest[i];

        if (d < 0) {  // byte 128-255
            d += 256;
        }
        if (d < 16) { //0-15 16
            s.append("0");
        }
        s.append(Integer.toString(d, 16));
    }
    return s.toString();
}

public static void main(String[] args) {

    try {
        // ドライバをロード
        Class.forName("org.gjt.mm.mysql.Driver");

        // データベースへ接続
        String url = "jdbc:mysql:///データベース名?&user=ユーザー名&password=パスワード&"
                   + "useUnicode=true&characterEncoding=UTF-8";
        Connection con = DriverManager.getConnection(url);

        // SQL 文を生成
        Statement s = con.createStatement();
        String sql = "SELECT * FROM `users`";

        // クエリーを実行して結果セットを取得
        ResultSet rs = s.executeQuery(sql);

        // 検索された行数分ループ
        while(rs.next()){
            String name     = rs.getString("name");  // ユーザー名
            String password = rs.getString("pass");  // パスワード

            // 表示

        }

        // データベースから切断
        s.close();
        con.close();

    } catch (Exception e) {
        e.printStackTrace();
    }
}

public static final String PROPERTY_FILE = "Client.properties";
public static final String HOST = "host";
public static final String PORT = "port";

public void init();

public static String DEFAULT_HOST = "192.168.0.1";
public static int    DEFAULT_PORT = 1024;

public static void main(String[] args) {

    Client client = new ClientImpl();
    client.init();
}

public void init() {

    this.getProperties();

}

protected void getProperties() {

    try {

        InputStream is = getClass().getResourceAsStream(Client.PROPERTY_FILE);
        Properties p = new Properties();
        p.load(is);

        if (p != null) {

            // Read a host address
            String host = p.getProperty(Client.HOST);
            if (host != null)
                DEFAULT_HOST = host;

            // Read a port
            String port = p.getProperty(Client.PORT);
            if (port != null)
                DEFAULT_PORT = Integer.parseInt(port);

        }
    } catch (Exception e) {
        System.out.println("File not found: " + Client.PROPERTY_FILE
                + ".  Ignored the error.");
    }
}