如何使用相同的密钥将多个参数提取到JSF托管bean中

public void setUsername(String username) {
    this.username = username;
}

public String getUsername() {
    return username;
}

public void setPassword(String password) {
    this.password = password;
}

public String getPassword() {
    return password;
}

<h:inputText value="#{myBean.username}" />
<h:inputSecret value="#{myBean.password}" />

private static final String SECRET_KEY = "mySecretKey";

public void setUsername(String username) {
    this.username = encrypt(username, SECRET_KEY);
}

public String getUsername() {
    return decrypt(username, SECRET_KEY);
}

public void setPassword(String password) {
    this.password = encrypt(password, SECRET_KEY);
}

public String getPassword() {
    return decrypt(password, SECRET_KEY);
}