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20 moos 1 
package ch.ffhs.webE.action;
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import java.util.ArrayList;
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import java.util.List;
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import javax.servlet.http.HttpServletRequest;
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import org.apache.struts2.ServletActionContext;
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import com.opensymphony.xwork2.ActionContext;
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import com.opensymphony.xwork2.ActionSupport;
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import com.opensymphony.xwork2.ModelDriven;
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import ch.ffhs.webE.dao.UserDAO;
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import ch.ffhs.webE.dao.UserDAOImpl;
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import ch.ffhs.webE.domain.User;
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public class UserAction extends ActionSupport implements ModelDriven<User>
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{
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    private static final long serialVersionUID = -6659925652584240539L;
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    private User user = new User();
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    private List<User> userList = new ArrayList<User>();
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    private UserDAO userDAO = new UserDAOImpl();
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    @Override
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    public User getModel()
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    {
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        return user;
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    }
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    /**
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     * Executes the DB query to save the user
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     *
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     * @return
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     */
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    public String addOrUpdate()
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    {
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        userDAO.saveOrUpdateUser(user);
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        return SUCCESS;
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    }
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    /**
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     * DB query for userList
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     *
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     * @return SUCCESS
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     */
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    public String list()
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    {
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        userList = userDAO.listUser();
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        return SUCCESS;
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    }
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    public String edit()
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    {
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        int id = getIdParameter();
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        if (id > 0)
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        {
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            user = userDAO.listUserById(id);
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            return SUCCESS;
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        }
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        else
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        {
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            return ERROR;
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        }
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    }
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    /**
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     * Gets the ID Parameter for update / delete requests
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     *
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     * @return int from the ID request. If not set or wrong, it gives back -1
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     */
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    private int getIdParameter()
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    {
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        HttpServletRequest request = (HttpServletRequest) ActionContext
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                .getContext().get(ServletActionContext.HTTP_REQUEST);
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        int id = -1;
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        try
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        {
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            id = Integer.parseInt(request.getParameter("id"));
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        }
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        catch (Exception e)
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        {
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            // TODO: Logging - wrong parameter set
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        }
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        return id;
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    }
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    /**
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     * deletes a user, gets the ID from the "id" parameter that was submitted
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     * with the HTTP request
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     *
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     * @return String - either SUCCESS or ERROR constant
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     */
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    public String delete()
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    {
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        int id = getIdParameter();
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        // Check for malicious ID values
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        if (id > 0)
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        {
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            userDAO.deleteUser(id);
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            return SUCCESS;
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        }
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        else
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        {
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            return ERROR;
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        }
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    }
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    /*
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     * Standard getters and setters
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     */
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    public User getUser()
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    {
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        return user;
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    }
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    public void setUser(User user)
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    {
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        this.user = user;
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    }
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    public List<User> getUserList()
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    {
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        return userList;
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    }
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    public void setUserList(List<User> userList)
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    {
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        this.userList = userList;
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    }
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}