Struts开发登录处理流程

声明： 在配置好Structs开发环境的基础上

 

1  配置Struts的映射地址

2  配置: 添加登录表单loginForm

3  配置：添加登录组件login

4  开发ActionForm Bean：创建登录表单类LoginForm.java

5  开发Action：创建登录处理类LoginAction.java

 

1  在使用Struts进行开发时 需要避免对JSP文件的直接访问 这样做的目的是为了将所有的请求都交给Struts来统一处理

在web.xml中进行映射配置

<servlet-mapping>
        <servlet-name>action</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

对于每一个name.do的请求 都必须在struts-config.xml中配置与"name"对应的组件 该组件是通过元素来注册的 使用的第一种配置形式-直接转发方式 来配置一个地址"index.do" 负责转发到登录页面login.jsp

<action path="/index" forward="/login.jsp" />

 

2  修改login.jsp的登录提交地址为login.do

<form name="form1" action="login.do" method="post">

3  配置 : 添加登录表单loginForm

<form-bean name="loginForm"
            type="com.demo.struts.forms.LoginForm">
        </form-bean>

4  配置：添加登录组件login

<action path="/login" name="loginForm" scope="request"
            type="com.demo.struts.actions.LoginAction" input="/login.jsp">
            <forward name="success" path="/welcome.jsp" />
            <forward name="failure" path="/login.jsp" />
        </action>

5  开发ActionForm Bean：创建登录表单类 LoginForm.java

 

package com.demo.struts.forms;

public class LoginForm extends ActionForm {

    proteced String username = nill;

    public String getPassword() {

        return password;
    }

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

    public String getUsername() {
        return username;
    }

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

6  开发Action 创建登录处理类LoginAction.java

 

package com.demo.struts.actions;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.sql.DataSource;

import org.apache.log4j.Logger;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.actions.DispatchAction;

public class LoginAction extends DispatchAction {


    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {

        ActionErrors errors = new ActionErrors();
        ActionForward forward = new ActionForward();
        LoginForm loginForm = (LoginForm) form;

        try {
            // get parameters
            String username = loginForm.getUsername();
            String password = loginForm.getPassword();
            // invalidate the original session if exists

            HttpSession session = request.getSession(false);
            if (session != null) {
                session.invalidate();
            }

            // create a new session for the user

            session = request.getSession(true);

            // login

            boolean isValid = false;
            if (username.equals("admin")&&password.equals("admin"))
            {
               isValid = true;
             }
            if (isValid) {
                session.setAttribute(Constants.USERNAME_KEY, username);

            } else {
                errors.add(ActionErrors.GLOBAL_MESSAGE, new ActionMessage(
                        "login.message.failed"));
            }

        } catch (Exception e) {
            errors.add(ActionErrors.GLOBAL_MESSAGE, new ActionMessage(
                    "login.message.failed"));

        }

        // If a message is required, save the specified key(s)

        // into the request for use by the  tag.


        if (!errors.isEmpty()) {
            saveErrors(request, errors);

            forward = mapping.findForward(Constants.FAILURE_KEY);
        } else {
            forward = mapping.findForward(Constants.SUCCESS_KEY);
        }

        // Finish with

        return (forward);
    }

}