JAVAWeb项目微型商城项目-------(五)用户登录实现

1.用户登录页面

验证码

        <tr>
	    <td width="15%" >验证码:</td>
	    <td width="40%" >
	        <input type="text" name="code" maxlength="4" size="4" onblur="validatecode()">
	        <img  src="pages/image.jsp">
	    </td>
        </tr>

验证码显示----img.jsp

<%@ page contentType="image/jpeg" import="java.awt.*, 
 java.awt.image.*,java.util.*,javax.imageio.*" pageEncoding="UTF-8"%> 
 <%! 
 Color getRandColor(int fc,int bc) 
 { 
 Random random = new Random(); 
 if(fc>255) fc=255; 
 if(bc>255) bc=255; 
 int r=fc+random.nextInt(bc-fc); 
 int g=fc+random.nextInt(bc-fc); 
 int b=fc+random.nextInt(bc-fc); 
 return new Color(r,g,b); 
 } 
 %> 
 <% 

 response.setHeader("Pragma","No-cache"); 
 response.setHeader("Cache-Control","no-cache"); 
 response.setDateHeader("Expires", 0); 
 int width=60, height=20; 
 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 
 Graphics g = image.getGraphics(); 
 Random random = new Random(); 
 g.setColor(getRandColor(200,250)); 
 g.fillRect(0, 0, width, height); 
 g.setFont(new Font("Times New Roman",Font.PLAIN,18)); 
 g.setColor(getRandColor(160,200)); 
 for (int i=0;i<155;i++) 
 { 
 int x = random.nextInt(width); 
 int y = random.nextInt(height); 
 int xl = random.nextInt(12); 
 int yl = random.nextInt(12); 
 g.drawLine(x,y,x+xl,y+yl); 
 } 
 String sRand=""; 
 for (int i=0;i<4;i++){ 
 String rand=String.valueOf(random.nextInt(10)); 
 sRand+=rand; 
 g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110))); 
 g.drawString(rand,13*i+6,16); 
 } 
 session.setAttribute("rand",sRand); 
 g.dispose(); 
 ImageIO.write(image, "JPEG", response.getOutputStream()); 

 out.clear();
 out = pageContext.pushBody();
 %>

记住密码获取reme的值设置自动登录 cookie 的保存时间

	<td colspan="3" >
	<input type="checkbox" name="reme" id = "reme" value="86400">记住密码
	</td>

2.用户业务层实现

a.激活操作

 /**
   * 
   * @Title: active   
   * @Description: TODO(激活的方法)   
   * @param: @param request
   * @param: @return      
   * @return: String      
   * @throws
   */
  private String active(HttpServletRequest request) {
    // 注册对象
    Member vo = new Member();
    // 执行提示信息的数据
    String msg = null;
    String url = null;
    String mid = request.getParameter("mid");
    String code = request.getParameter("code");
    // 判断用户和激活码的值是否匹配
    if (VakidateUtil.VakidateNoEmpty(mid) && VakidateUtil.VakidateNoEmpty(code)) {
      vo.setMid(mid);
      vo.setCode(code);
      try {
        // 激活地址为:
        // http://ip:端口/项目名称/pages/MemberServletfront/active?mid=用户名&code=激活码
        // 通过邮件点击以上地址激活
        if (ServletFrontFactory.getIMemberServletfrontInstance().active(vo)) {
          msg = "激活成功,请登录";
          url = "/pages/member_login.jsp";
          System.out.println("激活成功");
        } else {
          msg = "激活失败,请重新激活";
          url = "index.jsp";
          System.out.println("激活失败");
        }
      } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    } else {
      msg = "错误的激活操作 !!!!";
      url = "index.jsp";
      System.out.println("错误激活");
    }
    request.setAttribute("msg", msg);
    request.setAttribute("url", url);

    return "/pages/forward.jsp";
  }

b.激活操作

/**
   * 
   * @Title: login   
   * @Description: TODO(登录的方法)   
   * @param: @param request
   * @param: @return      
   * @return: String      
   * @throws
   */
  public String login(HttpServletRequest request, HttpServletResponse response) {
    try {
      
      Member vo = new Member();
      // 执行提示信息的数据
      String msg = null;
      String url = null;
      String mid = request.getParameter("mid");
      String password = request.getParameter("password");
      String code = request.getParameter("code");// 验证码
      String rand = (String) request.getSession().getAttribute("rand");
      System.out.println(1);
      if (VakidateUtil.VakidateNoEmpty(mid) && VakidateUtil.VakidateNoEmpty(code)
          && VakidateUtil.VakidateNoEmpty(password)) {
        if (VakidateUtil.Vakidatesame(code, rand)) {
          vo.setMid(mid);
          vo.setPassword(new MD5Code().MD5Encode(password));

          System.out.println(mid + "==" + password + "==" + code + rand);
          if (ServletFrontFactory.getIMemberServletfrontInstance().login(vo)) {
            request.getSession().setAttribute("mid", mid);
            System.out.println(vo.getPhoto() + 2);
            request.getSession().setAttribute("photo", vo.getPhoto());
            msg = "登陆成功";
            url = "index.jsp";
            // 存储cookie
            if (request.getParameter("reme") != null) {// 选择了复选框(复选框设置value值
                                                       // 表示自动保存时间)
              int expiry = Integer.parseInt(request.getParameter("reme"));
              CookieUtil.save(response, request, "mid", mid + "#" + vo.getPassword(), expiry);
            }

          } else {
            msg = "登录失败未激活,错误的密码或用户名";
            url = "/pages/member_login.jsp";
          }
        } else {
          msg = "验证码输入错误,请重新输入";
          url = "/pages/member_login.jsp";
        }
      } else {
        msg = "信息输入错误,请重新登录";
        url = "/pages/member_login.jsp";
      }

      request.setAttribute("msg", msg);
      request.setAttribute("url", url);
      return "/pages/forward.jsp";
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }

    return "/pages/errors.jsp";
  }

b.退出操作(略)

cookie工具类用于自动登录操作和退出操作

package utils;


import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 
 * @ClassName:  CookieUtil   
 * @Description:TODO(cookie工具类)   
 * @author: kiko 
 * @date:   2018年6月21日 下午6:10:48   
 *     
 * @Copyright: 2018
 */
public class CookieUtil {
  /**
   * 
   * @Title: findCookie   
   * @Description: TODO(在cookie集合转换成map集合cookie)   
   * @param: @param request
   * @param: @return      
   * @return: Cookie      
   * @throws
   */
  public static Map<String, String> findCookie(HttpServletRequest request) {
    Map<String, String> map = new HashMap<String, String>();
    Cookie[] cookies = request.getCookies();

    if (cookies != null) {
      for (Cookie cookie : cookies) {
        map.put(cookie.getName(), cookie.getValue());
      }
    }

    return map;
  }



  /**
   * 
   * @Title: save   
   * @Description: TODO(保存cookie 设置cookie保存时间和名字)   
   * @param: @param response
   * @param: @param name
   * @param: @param value
   * @param: @param expiry      
   * @return: void      
   * @throws
   */
  public static void save(HttpServletResponse response, HttpServletRequest request, String name,
      String value, int expiry) {
    Cookie c = new Cookie(name, value);
    c.setMaxAge(expiry);
    c.setPath("/");// 设置保存路径
    response.addCookie(c);
  }

  /**
   * 
   * @Title: clear   
   * @Description: TODO(清除cookie)   
   * @param: @param response
   * @param: @param request      
   * @return: void      
   * @throws
   */
  public static void clear(HttpServletResponse response, HttpServletRequest request) {
    Map<String, String> map = findCookie(request);
    Iterator<Map.Entry<String, String>> iter = map.entrySet().iterator();
    while (iter.hasNext()) {
      Map.Entry<String, String> me = iter.next();
      Cookie c = new Cookie(me.getKey(), "");
      c.setMaxAge(0);
      response.addCookie(c);
    }
  }
}

PS:

 Iterator<Map.Entry<String, String>> iter = map.entrySet().iterator();

//获得map的迭代器，用作遍历map中的每一个键值对
Iterator是迭代器，map之前应该定义过，姑且认为是HashMap。
<Entry<String,String>>表示map中的键值对都是String类型的。
map.entrySet()是把HashMap类型的数据转换成集合类型
map.entrySet().iterator()是去获得这个集合的迭代器，保存在iter里面。。
迭代器这么用：
while(iter.hasNext()) {
Entry obj = it.next();//就能获得map中的每一个键值对了