用Struts实现用户登陆的功能

1.在web.xml中配置一个过滤器

 

   首先，我们要在web.xml中设置一个过滤器，这样用户访问所有的页面的时候都必须先登陆。

 

   过滤器的设置代码如下：

 

<filter>
  <description>登陆过滤器</description>
  <display-name>loginFilter</display-name>
  <filter-name>loginFilter</filter-name>
  <filter-class>com.tntxia.filter.LoginFilter</filter-class>
 </filter>
 <filter-mapping>
  <filter-name>loginFilter</filter-name>
  <url-pattern>*</url-pattern>
 </filter-mapping>
 <filter-mapping>

 其中url-pattern属性我们设置的为：*，表示所有的请求都会被这个过滤器所过滤。

 

2. 设置Struts

 

设置struts-config.xml

     A.增加一个FormBean:UserForm

    

<form-bean name="userForm" type="com.tntxia.struts.form.UserForm" />

 

    B.增加一个登陆的Action

    

   

<action attribute="userForm" input="/login.jsp"
	name="userForm" path="/login" scope="request"
	type="com.tntxia.struts.action.LoginAction">
	<forward name="/success" path="/uploadPhoto.jsp" />
</action>

 3.UserForm类的代码：

   

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package com.tntxia.struts.form;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;

/** 
 * MyEclipse Struts
 * Creation date: 06-21-2009
 * 
 * XDoclet definition:
 * @struts.form name="userFormForm"
 */
public class UserForm extends ActionForm {
	/**
	 * 
	 */
	private static final long serialVersionUID = -9144040556996550030L;

	/*
	 * Generated fields
	 */
	
	private String userId;
	
	private String password;

	/** 
	 * Method validate
	 * @param mapping
	 * @param request
	 * @return ActionErrors
	 */
	public ActionErrors validate(ActionMapping mapping,
			HttpServletRequest request) {
		// TODO Auto-generated method stub
		return null;
	}

	/** 
	 * Method reset
	 * @param mapping
	 * @param request
	 */
	public void reset(ActionMapping mapping, HttpServletRequest request) {
		// TODO Auto-generated method stub
	}

	public String getUserId() {
		return userId;
	}

	public void setUserId(String userId) {
		this.userId = userId;
	}

	public String getPassword() {
		return password;
	}

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

}

 

4.LoginAction的代码：

 

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package com.tntxia.struts.action;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Map;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.FormFile;

import com.tntxia.db.util.DBUtil;
import com.tntxia.struts.form.PhotoForm;

/** 
 * MyEclipse Struts
 * Creation date: 06-21-2009
 * 
 * XDoclet definition:
 * @struts.action validate="true"
 */
public class UploadFileAction extends Action {
	/*
	 * Generated Methods
	 */

	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {

		PhotoForm userForm = (PhotoForm)form;
		FormFile file = userForm.getPhoto();
		try{
			UUID uuid = UUID.randomUUID();
			String pre = uuid.toString();
			String ext = file.getFileName().substring(file.getFileName().lastIndexOf("."));
			File saveFile = new File(this.getServlet().getServletContext().getRealPath("/")+"\\upload",pre+ext);
			InputStream in = file.getInputStream();
			FileOutputStream out = new FileOutputStream(saveFile);
			int len = 0;
			byte[] buf = new byte[1024];
			while((len = in.read(buf))!=-1){
				out.write(buf,0,len);
			}
			in.close();
			out.close();
			response.setContentType("text/html;charset=GBK");
			response.getWriter().print(file.getFileName());
			ArrayList<String> params = new ArrayList<String>();
			params.add(userForm.getName());
			params.add(pre+ext);
			DBUtil.executePreparedSQL("insert into photo(name,fileName) values(?,?)", params);
			ArrayList<String> cols = new ArrayList<String>();
			cols.add("name");
			cols.add("fileName");
			Map<String,ArrayList<String>> result = DBUtil.getArrayResult(cols, "select * from photo");
			request.setAttribute("result", result);
		}catch(Exception e){
			e.printStackTrace();
		}
		return mapping.findForward("/success");
	}
}

 

5. 登陆过滤器的代码：

 

package com.tntxia.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginFilter implements Filter {

	public void destroy() {
		// TODO Auto-generated method stub
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse res = (HttpServletResponse) response;
		HttpSession session = req.getSession();
		String uri = req.getRequestURI();
		
		if(uri.indexOf("login.jsp")!=-1||uri.indexOf("login.do")!=-1){
			chain.doFilter(request, response);
		}else if(session.getAttribute("userId")!=null){
			chain.doFilter(request, response);
		}else{
			res.sendRedirect("login.jsp");
		}

	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub

	}

}