开源技术——体验Struts

用户登陆的实现

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.*;

public class LoginForm extends ActionForm
{
    private static final long serialVersionUID = 1L;
    private String user = null;
    private String password = null;

    public String getPassword()
    {
        return password;
    }

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

    public String getUser()
    {
        return user;
    }

    public void setUser( String user )
    {
        this.user = user;
    }
   
    public void reset(ActionMapping mapping,HttpServletRequest request)
    {
        this.password = null;这里很重要，当用户输入有错时，需要返回登陆界面给用户，为了用户填写方便我们可以设置返回给用户的哪部分信息设置为空
    }
}

我用来实现登陆的DispatchAction代码如下：
      public ActionForward login( ActionMapping mapping, ActionForm form,
            HttpServletRequest req, HttpServletResponse res ) throws Exception
    {
         Service service = getService();调用业务逻辑
        LoginForm loginForm = (LoginForm) form;获取formbean
        String user = loginForm.getUser();提取用户名
        Person person = service.getUser( user );从业务逻辑中查找用户
        ActionMessages messages = new ActionMessages();
        ActionMessage am;
        if ( person == null )如果用户不存在，我们就返回
        {
            am = new ActionMessage( "index.jsp.fail.user", user );参数的意义：第一个是主串，而后面的作为arg数组
            messages.add( "user", am );把错误信息放到errors 属性为user那里去显示
            saveErrors( req, messages );
            form.reset( mapping, req );如果出现错误，调用formbean的重置功能
            return mapping.findForward( ID.FAIL );
        }
        if ( !person.getPassword().equals( loginForm.getPassword() ) )如果密码不一致
        {
            am = new ActionMessage( "index.jsp.fail.password", user );
            messages.add( "password", am );
            saveErrors( req, messages );
            form.reset( mapping, req );
            return mapping.findForward( ID.FAIL );
        }
       
        setSessionObject( req, person.getType(), person );把用户放到session里
        return new ActionForward( person.getType() + ".do", true );我在每个类型用户的类中加入了一个getType来在这里调用，之后动态的去对应的admin.do,student.do,teacher.do的主页面，并且这里实现的不是请求转发，而是请求从定向
   }

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