diff --git a/README.md b/README.md
index c4520c6c23f8c3cd6d1cf424abf6264297fe2308..f1d0c8d811e48397f19f69728fe3fdeb3a3bb490 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@
#### 完成内容列表
1. 搭建环境
-2. xxxx
+2. 完成修改
3. xxxx
4. xxxx
diff --git a/com/pom.xml b/com/pom.xml
new file mode 100644
index 0000000000000000000000000000000000000000..a49a9f5bae09c4595e958bd29699962f24ff5d67
--- /dev/null
+++ b/com/pom.xml
@@ -0,0 +1,54 @@
+
+
+ 4.0.0
+
+ com.example
+ com
+ 1.0-SNAPSHOT
+ com
+ war
+
+
+ 1.8
+ 1.8
+ 5.7.0
+
+
+
+
+ javax
+ javaee-api
+ 8.0.1
+ provided
+
+
+ org.junit.jupiter
+ junit-jupiter-api
+ ${junit.version}
+ test
+
+
+ org.junit.jupiter
+ junit-jupiter-engine
+ ${junit.version}
+ test
+
+
+ mysql
+ mysql-connector-java
+ 8.0.11
+
+
+
+
+
+
+ org.apache.maven.plugins
+ maven-war-plugin
+ 3.3.0
+
+
+
+
\ No newline at end of file
diff --git a/com/src/main/java/LoginFilter.java b/com/src/main/java/LoginFilter.java
new file mode 100644
index 0000000000000000000000000000000000000000..20be22fba156012b2caba4ffdbd0fd2587a29eda
--- /dev/null
+++ b/com/src/main/java/LoginFilter.java
@@ -0,0 +1,39 @@
+import java.io.IOException;
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+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.HttpServletResponseWrapper;
+
+public class LoginFilter implements Filter {
+
+ public void doFilter(ServletRequest request,
+ ServletResponse response,
+ FilterChain chain) throws IOException, ServletException {
+ HttpServletRequest hrequest = (HttpServletRequest)request;
+ HttpServletResponseWrapper wrapper = new HttpServletResponseWrapper((HttpServletResponse) response);
+ String user = null;
+ if(hrequest.getSession(false) != null){
+
+ user = ( String ) hrequest.getSession(false).getAttribute("username");
+ }
+ if (hrequest.getRequestURI().contains("index")) {
+ // 对登录页面不进行过滤
+ chain.doFilter(request, response);
+ return;
+ }
+
+ //判断用户是否登录
+ if (user == null & !(hrequest.getRequestURI().contains("login"))){
+ wrapper.sendRedirect("index.jsp");
+ return;
+ }else {
+ chain.doFilter(request, response);
+ return;
+ }
+
+ }
+}
diff --git a/com/src/main/java/LoginServlet.java b/com/src/main/java/LoginServlet.java
new file mode 100644
index 0000000000000000000000000000000000000000..dcb0281738a1f9b3628acf9b2ea0e68534480ac7
--- /dev/null
+++ b/com/src/main/java/LoginServlet.java
@@ -0,0 +1,43 @@
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.*;
+import java.io.*;
+import javax.servlet.*;
+
+@WebServlet("/loginAction")
+public class LoginServlet extends HttpServlet {
+
+ protected void doPost(HttpServletRequest request,
+ HttpServletResponse response) throws ServletException, IOException
+ {
+
+ response.setContentType("text/html;charset=gb2312");
+ request.setCharacterEncoding("utf-8");
+ User u = new User();
+ u.setUsername(request.getParameter("username"));
+ u.setPassword(request.getParameter("password"));
+ request.setAttribute("user", u);
+
+ boolean flag = Service.assertUser(u);
+
+ if(flag){
+ // 判断用户登录成功，创建session
+ request.getSession();
+ request.setAttribute("count",OnlineCont.count);
+ request.getRequestDispatcher("/main.jsp").forward(request,response);
+ }else{
+ response.sendRedirect("./index.jsp");
+ }
+
+ }
+
+ @Override
+ protected void doGet(HttpServletRequest request, HttpServletResponse response)
+ throws ServletException, IOException {
+ request.getSession().invalidate();
+ response.sendRedirect("./index.jsp");
+ }
+}
+
+}
+
+
diff --git a/com/src/main/java/OnlineCont.java b/com/src/main/java/OnlineCont.java
new file mode 100644
index 0000000000000000000000000000000000000000..343023449991f684e5c2d87d3b87bc01310bcd94
--- /dev/null
+++ b/com/src/main/java/OnlineCont.java
@@ -0,0 +1,23 @@
+import javax.servlet.http.HttpSessionEvent;
+import javax.servlet.http.HttpSessionListener;
+
+public class OnlineCont implements HttpSessionListener {
+ static int count=0;
+ static HttpSessionEvent se;
+
+ @Override
+ public void sessionCreated(HttpSessionEvent se) {
+ System.out.println("into sessionCreated");
+ count++;
+ se.getSession().getServletContext().setAttribute("count", count);
+
+ }
+
+ @Override
+ public synchronized void sessionDestroyed(HttpSessionEvent se) {
+ count--;
+ se.getSession().getServletContext().setAttribute("count", count);
+ }
+
+
+}
\ No newline at end of file
diff --git a/com/src/main/java/Service.java b/com/src/main/java/Service.java
new file mode 100644
index 0000000000000000000000000000000000000000..2de1ecf9a58845c73fadd86102b4391791e5f356
--- /dev/null
+++ b/com/src/main/java/Service.java
@@ -0,0 +1,51 @@
+import java.sql.*;
+
+
+public class Service {
+ public static boolean assertUser(User u){
+ // TODO Auto-generated method stub
+ boolean flag = false;
+ try {
+
+ //加载驱动程序
+ Class.forName("com.mysql.cj.jdbc.Driver");
+
+ //创建连接
+ String url="jdbc:mysql://localhost:3306/javaee?serverTimezone=GMT&useSSL=false&allowPublicKeyRetrieval=true";
+ String username="root";
+ String pwd ="root";
+ Connection conn = DriverManager.getConnection(url,username,pwd);
+
+ //创建Statement，执行sql
+ Statement st=conn.createStatement();
+ String sql = "select * from user where username = '"+u.getUsername()+"' ";
+ ResultSet rs =st.executeQuery(sql);
+
+ while(rs.next()){
+ if(rs.getString("password").equals(u.getPassword())){
+ flag = true;
+ }else{
+ flag = false;
+ }
+ }
+
+
+ //关闭连接
+ rs.close();
+ st.close();
+ conn.close();
+ } catch (ClassNotFoundException e) {
+ // TODO Auto-generated catch block
+ e.printStackTrace();
+ } catch (SQLException e) {
+ // TODO Auto-generated catch block
+ e.printStackTrace();
+ }
+
+ return flag;
+ }
+
+
+
+
+}
diff --git a/com/src/main/java/User.java b/com/src/main/java/User.java
new file mode 100644
index 0000000000000000000000000000000000000000..a80078e849b80aa384f4296fbc4d9e325d6b55f2
--- /dev/null
+++ b/com/src/main/java/User.java
@@ -0,0 +1,20 @@
+public class User {
+ private String username;
+ private String password;
+
+ public String getUsername() {
+ return username;
+ }
+
+ public void setUsername(String username) {
+ this.username = username;
+ }
+
+ public String getPassword() {
+ return password;
+ }
+
+ public void setPassword(String password) {
+ this.password = password;
+ }
+}
diff --git a/com/src/main/webapp/WEB-INF/web.xml b/com/src/main/webapp/WEB-INF/web.xml
new file mode 100644
index 0000000000000000000000000000000000000000..c2d2cf41ea753c209d3de1c808aca841a28d757e
--- /dev/null
+++ b/com/src/main/webapp/WEB-INF/web.xml
@@ -0,0 +1,26 @@
+
+
+
+
+ LoginServlet
+ LoginServlet
+
+
+ LoginServlet
+ /loginAction
+
+
+ SessionFilter
+ LoginFilter
+
+
+ SessionFilter
+ /*
+
+
+ OnlineCont
+
+
\ No newline at end of file
diff --git a/com/src/main/webapp/index.jsp b/com/src/main/webapp/index.jsp
new file mode 100644
index 0000000000000000000000000000000000000000..974e2d892eafd8b3cf2e2c59c60d9ac3905d1450
--- /dev/null
+++ b/com/src/main/webapp/index.jsp
@@ -0,0 +1,37 @@
+<%@ page session="false" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
+
+
+
+ JSP - Hello World
+
+
+<%= "Hello World!" %>
+
+<%
+ HttpSession s = request.getSession(false);
+%>
+
+
+
+
+
\ No newline at end of file
diff --git a/com/src/main/webapp/main.jsp b/com/src/main/webapp/main.jsp
new file mode 100644
index 0000000000000000000000000000000000000000..a465add6d6f62ee288ab30d732dbac0ed3da3e8f
--- /dev/null
+++ b/com/src/main/webapp/main.jsp
@@ -0,0 +1,27 @@
+<%--
+ Created by IntelliJ IDEA.
+ User: lijunhui
+ Date: 3/18/2021
+ Time: 11:00 AM
+ To change this template use File | Settings | File Templates.
+--%>
+<%@ page session="false" contentType="text/html;charset=UTF-8" language="java" %>
+
+
+
+
+ Main
+
+
+
+ - Hello ${user.username}
+
- Now has ${count} people
+
+
+
+
+
+
+
diff --git a/com/target/com-1.0-SNAPSHOT/META-INF/MANIFEST.MF b/com/target/com-1.0-SNAPSHOT/META-INF/MANIFEST.MF
new file mode 100644
index 0000000000000000000000000000000000000000..5168ab5b65abe27bd01f1ed6a70df94d4700dd6a
--- /dev/null
+++ b/com/target/com-1.0-SNAPSHOT/META-INF/MANIFEST.MF
@@ -0,0 +1,5 @@
+Manifest-Version: 1.0
+Created-By: IntelliJ IDEA
+Built-By: lijunhui
+Build-Jdk: version 15.0.1
+
diff --git a/com/target/com-1.0-SNAPSHOT/WEB-INF/web.xml b/com/target/com-1.0-SNAPSHOT/WEB-INF/web.xml
new file mode 100644
index 0000000000000000000000000000000000000000..3725c596a65f9f12a0f3dd21569701ae0b3f94ca
--- /dev/null
+++ b/com/target/com-1.0-SNAPSHOT/WEB-INF/web.xml
@@ -0,0 +1,15 @@
+
+
+
+
+ LoginServlet
+ LoginServlet
+
+
+ LoginServlet
+ /loginAction
+
+
\ No newline at end of file
diff --git a/com/target/com-1.0-SNAPSHOT/index.jsp b/com/target/com-1.0-SNAPSHOT/index.jsp
new file mode 100644
index 0000000000000000000000000000000000000000..7edddc347abbe0b77ce8ebf4a0f2bf4b4f7eaa20
--- /dev/null
+++ b/com/target/com-1.0-SNAPSHOT/index.jsp
@@ -0,0 +1,35 @@
+<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
+
+
+
+ JSP - Hello World
+
+
+<%= "Hello World!" %>
+
+
+Login JSP
+
+
+
+
\ No newline at end of file
diff --git a/com/target/com-1.0-SNAPSHOT/main.jsp b/com/target/com-1.0-SNAPSHOT/main.jsp
new file mode 100644
index 0000000000000000000000000000000000000000..2d4e943a6297e2ed9ef15dabcd2e60ace4effcb1
--- /dev/null
+++ b/com/target/com-1.0-SNAPSHOT/main.jsp
@@ -0,0 +1,20 @@
+<%--
+ Created by IntelliJ IDEA.
+ User: lijunhui
+ Date: 3/18/2021
+ Time: 11:00 AM
+ To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ Main
+
+
+
+ - Hello ${sessionScope.u.username}
+
+
+
+
+