finish the basic funcitons of a chat room

use servlet to bulid a char room

.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+	<classpathentry kind="lib" path="D:/Program Files/Apache Software Foundation/Tomcat 9.0/lib/servlet-api.jar"/>
+	<classpathentry kind="lib" path="D:/Program Files/Apache Software Foundation/Tomcat 9.0/lib/jstl.jar"/>
+	<classpathentry kind="lib" path="D:/Program Files/Apache Software Foundation/Tomcat 9.0/lib/standard.jar"/>
+	<classpathentry kind="lib" path="D:/Program Files/Apache Software Foundation/Tomcat 9.0/lib/mysql-connector-java-5.0.8-bin.jar"/>
+	<classpathentry kind="output" path="web/WEB-INF/classes"/>
+</classpath>

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>chat room</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.source=1.8

src/bean/Content.java

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+package bean;
+
+public class Content {
+    private int id;
+    private String username;
+    private String stime;
+    private String content;
+
+    public int getId() { return id; }
+    public String getUsername() { return username; }
+    public String getStime() { return stime; }
+    public String getContent() { return content; }
+    public void setId(int id) { this.id = id; }
+    public void setUsername(String name) { this.username = name; }
+    public void setStime(String stime) { this.stime = stime; }
+    public void setContent(String content) { this.content = content; }
+}

src/bean/User.java

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+package bean;
+
+public class User {
+    private int id;
+    private String name;
+    private String password;
+    public int getId() {
+        return id;
+    }
+    public void setId(int id) {
+        this.id = id;
+    }
+    public String getName() {
+        return name;
+    }
+    public void setName(String name) {
+        this.name = name;
+    }
+    public String getPassword() {
+        return password;
+    }
+    public void setPassword(String password) {
+        this.password = password;
+    }
+}

src/dao/ContentDAO.java

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+package dao;
+import java.util.List;
+import java.util.LinkedList;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+import bean.Content;
+
+public class ContentDAO {
+
+    public static void main(String[] args) {
+        Content p = new Content();
+        p.setUsername("jane");
+        p.setStime("03/23/2016");
+        p.setContent("this is added by eclipse");
+        new ContentDAO().addContent(p);
+    }
+
+    public void addContent(Content p) {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            Connection c = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/chatroom?characterEncoding=UTF-8",
+                    "root", "password");
+            String sql = "INSERT INTO record values(null, ?, ?, ?);";
+            PreparedStatement ps = c.prepareStatement(sql);
+            ps.setString(1, p.getUsername());
+            ps.setString(2, p.getStime());
+            ps.setString(3, p.getContent());
+            ps.executeUpdate();
+
+            ps.close();
+            c.close();
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public List<Content> ListContent() {
+        List<Content> list = new LinkedList<>();
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            Connection c = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/chatroom?characterEncoding=UTF-8",
+                    "root", "password");
+            String sql = "select * from record";
+            PreparedStatement ps = c.prepareStatement(sql);
+            ResultSet rs = ps.executeQuery();
+
+            while (rs.next()) {
+                Content content = new Content();
+                content.setId(rs.getInt(1));
+                content.setUsername(rs.getString(2));
+                content.setContent(rs.getString(4));
+                content.setStime(rs.getString(3));
+
+                list.add(content);
+            }
+
+            ps.close();
+            c.close();
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return list;
+    }
+}

src/dao/UserDAO.java

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+package dao;
+
+import java.io.IOException;
+import java.util.List;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+import bean.User;
+
+public class UserDAO {
+
+    public static void main(String[] args) {
+        User p = new UserDAO().getUser("tom", "123");
+        if (p == null) System.out.println(false);
+        else System.out.println(true);
+    }
+
+    public User getUser(String name, String password) {
+        User r = null;
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            Connection c = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/chatroom?characterEncoding=UTF-8",
+                    "root", "password");
+            String sql = "select * from user where name = ? and password = ?";
+            PreparedStatement ps = c.prepareStatement(sql);           
+            ps.setString(1, name);
+            ps.setString(2, password);
+            ResultSet rs = ps.executeQuery();
+
+            if (rs.next()) {
+                r = new User();
+                r.setName(name); 
+                r.setPassword(password);
+                r.setId(rs.getInt(1));
+            }
+
+            ps.close();
+            c.close();
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return r;
+    }
+}

src/servlet/GetContentServlet.java

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+package servlet;
+
+import java.io.IOException;
+import java.util.List;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import dao.ContentDAO;
+import bean.Content;
+
+public class GetContentServlet extends HttpServlet{
+    protected void service(HttpServletRequest request, HttpServletResponse response) 
+        throws ServletException, IOException {
+            List<Content> list = new ContentDAO().ListContent();
+            request.setAttribute("contents", list);
+            request.getRequestDispatcher("interface.jsp").forward(request, response);
+        }
+
+}

src/servlet/StorageServlet.java

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+package servlet;
+
+public class StorageServlet {
+
+}

src/servlet/SubmitServlet.java

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+package servlet;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.util.Date;
+
+import java.util.Enumeration;
+
+import dao.ContentDAO;
+import bean.Content;
+import bean.User;
+
+public class SubmitServlet extends HttpServlet {
+    protected void service(HttpServletRequest request, HttpServletResponse response) 
+        throws ServletException, IOException {
+
+            /*Enumeration paramNames = request.getSession().getAttributeNames();
+            while (paramNames.hasMoreElements()) {
+                String paraName = (String)paramNames.nextElement();  
+                System.out.println(paraName);
+            }*/
+            String text = request.getParameter("text");
+
+            User user = (User) request.getSession().getAttribute("user");
+
+            Content p = new Content();
+            p.setContent(text);
+            p.setUsername(user.getName());
+            p.setStime(new Date().toLocaleString());
+
+            new ContentDAO().addContent(p);
+            new GetContentServlet().service(request, response);
+    }
+}

src/servlet/UserLoginServlet.java

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+package servlet;
+
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import bean.User;
+import dao.UserDAO;
+
+public class UserLoginServlet extends HttpServlet{
+    protected void service(HttpServletRequest request, HttpServletResponse response) 
+        throws ServletException, IOException {
+            String name = request.getParameter("user");
+            String password = request.getParameter("password");
+            System.out.println(name);
+            System.out.println(password);
+            User p = new UserDAO().getUser(name, password);
+            if (p != null) {
+                request.getSession().setAttribute("user", p);
+                response.sendRedirect("/content");
+            }
+            else {
+                response.sendRedirect("/login.jsp");
+            }
+        }
+}

web/WEB-INF/web.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<web-app>
+
+    <servlet>
+        <servlet-name>GetContentServlet</servlet-name>
+        <servlet-class>servlet.GetContentServlet</servlet-class>
+    </servlet>
+
+    <servlet-mapping>
+        <servlet-name>GetContentServlet</servlet-name>
+        <url-pattern>/content</url-pattern>
+    </servlet-mapping>
+
+    <servlet>
+        <servlet-name>Login</servlet-name>
+        <servlet-class>servlet.UserLoginServlet</servlet-class>
+    </servlet>
+
+    <servlet-mapping>
+        <servlet-name>Login</servlet-name>
+        <url-pattern>/login</url-pattern>
+    </servlet-mapping>
+
+    <servlet>
+        <servlet-name>submit_content</servlet-name>
+        <servlet-class>servlet.SubmitServlet</servlet-class>
+    </servlet>
+
+    <servlet-mapping>
+        <servlet-name>submit_content</servlet-name>
+        <url-pattern>/submit_content</url-pattern>
+    </servlet-mapping>
+
+</web-app>

web/interface.jsp

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+<%@ page language="java" contentType="text/html; charset=UTF-8"
+    pageEncoding="UTF-8" import="java.util.*"%>
+<!DOCTYPE html>
+<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> 
+
+<c:if test="${!empty user}" >
+    <div align="center">
+        当前用户: ${user.name} <br>
+    </div>
+</c:if>
+
+
+<%@ include file="record.jsp" %>
+
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+
+
+<form action="submit_content" method="post">
+输入聊天内容: <input type = "text" name = "text" />
+                <!--style = "height:300px;width:500px;" />  -->
+<br>
+<input type = "submit" value = "submit" />
+</form>
+
+<!-- <div>留 言<br> <textarea name="textfield3" cols="30" rows="3"></textarea> -->

web/login.jsp

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+<%@ page language="java" contentType="text/html; charset=UTF-8"
+    pageEncoding="UTF-8" import="java.util.*"%>
+
+<!DOCTYPE html>
+
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+
+<form action="login" method="post">
+账号: <input type = "text" name = "user" /> <br>
+密码: <input type = "password" name = "password" /> <br>
+<input type="submit" value = "登录">
+</form>

web/record.jsp

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+<%@ page language="java" contentType="text/html; charset=UTF-8"
+    pageEncoding="UTF-8" import="java.util.*"%>
+
+
+
+<c:forEach items="${contents}" var="content" varStatus="st">
+    <font color="#FF0000"> ${content.stime} 12333</font> <br>
+    <Strong> <font color="#000079"> ${content.username}: </font> </Strong>
+    ${content.content} <br> <br>
+</c:forEach>
+
+