• Java后端 学习路线 笔记汇总表【黑马程序员】

1. JavaWeb黑马旅游网-学习笔记01【准备工作】
2. JavaWeb黑马旅游网-学习笔记02【注册功能】
3. JavaWeb黑马旅游网-学习笔记03【登陆和退出功能】
4. JavaWeb黑马旅游网-学习笔记04【BaseServlet抽取】
5. JavaWeb黑马旅游网-学习笔记05【分类数据展示功能】
6. JavaWeb黑马旅游网-学习笔记06【旅游线路分页展示分页展示】
7. JavaWeb黑马旅游网-学习笔记07【旅游线路查询】
8. JavaWeb黑马旅游网-学习笔记08【旅游线路详情】
9. JavaWeb黑马旅游网-学习笔记09【旅游线路收藏】
10. JavaWeb黑马旅游网-学习笔记10【项目代码】

目录

18-登录功能_分析

19-登录功能_实现_Servlet

LoginServlet.java

20-登录功能_实现_Service&Dao

UserServiceImpl.java

UserDaoImpl.java

21-登录功能_实现_前台页面

login.html

22-登录功能_姓名提示

header.html代码

FindUserServlet代码

23-退出功能

header.html

ExitServlet.java

18-登录功能_分析

19-登录功能_实现_Servlet

LoginServlet.java

package cn.itcast.travel.web.servlet;import cn.itcast.travel.domain.ResultInfo;
import cn.itcast.travel.domain.User;
import cn.itcast.travel.service.UserService;
import cn.itcast.travel.service.impl.UserServiceImpl;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.commons.beanutils.BeanUtils;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//1.获取用户名和密码数据Map map = request.getParameterMap();//2.封装User对象User user = new User();try {BeanUtils.populate(user, map);} catch (IllegalAccessException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}//3.调用Service查询UserService service = new UserServiceImpl();User u = service.login(user);ResultInfo info = new ResultInfo();//4.判断用户对象是否为nullif (u == null) {//用户名密码或错误info.setFlag(false);info.setErrorMsg("用户名密码或错误！");}//5.判断用户是否激活if (u != null && !"Y".equals(u.getStatus())) {//用户尚未激活info.setFlag(false);info.setErrorMsg("您尚未激活，请激活！");}//6.判断是否登录成功if (u != null && "Y".equals(u.getStatus())) {request.getSession().setAttribute("user", u);//登录成功标记//登录成功info.setFlag(true);}//响应数据ObjectMapper mapper = new ObjectMapper();response.setContentType("application/json;charset=utf-8");mapper.writeValue(response.getOutputStream(), info);}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);}
}

20-登录功能_实现_Service&Dao

UserServiceImpl.java

UserDaoImpl.java

21-登录功能_实现_前台页面

login.html

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登录自动登录
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22-登录功能_姓名提示

index页面中 用户姓名的提示信息功能

header.html代码

FindUserServlet代码

package cn.itcast.travel.web.servlet;import com.fasterxml.jackson.databind.ObjectMapper;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;@WebServlet("/findUserServlet")
public class FindUserServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//从session中获取登录用户Object user = request.getSession().getAttribute("user");//将user写回客户端ObjectMapper mapper = new ObjectMapper();response.setContentType("application/json;charset=utf-8");mapper.writeValue(response.getOutputStream(), user);}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);}
}

23-退出功能

什么叫做登录了？session中有user对象。

实现步骤：

1. 访问servlet，将session销毁
2. 跳转到登录页面

header.html

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400-618-9090

ExitServlet.java

package cn.itcast.travel.web.servlet;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;@WebServlet("/exitServlet")
public class ExitServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//1.销毁sessionrequest.getSession().invalidate();//2.跳转登录页面response.sendRedirect(request.getContextPath() + "/login.html");}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);}
}

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