使用java基于pushlet和bootstrap实现的简单聊天室

package com.hongyuan.core;
 
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Types;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
import javax.sql.DataSource;
 
import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;
 
public class DBUtil {
    
    private static DataSource dataSource = null;
    static{
        /**
         * 初始化数据源，不同的数据库获取数据源的方式不同，可参考相应数据库的说明文档。
         */
        MysqlDataSource mds=new MysqlDataSource();
        mds.setURL("jdbc:mysql://localhost:3306/test");
        mds.setUser("test");
        mds.setPassword("123456");
        mds.setCharacterEncoding("utf8");
        dataSource=mds;
    }
    
    /**
     * 获取数据库连接
     * @return
     * @throws SQLException
     */
    public static Connection getConnection() throws SQLException {
        return dataSource.getConnection();
    }
 
    /**
     * 关闭数据库连接资源
     * @param conn 
     * @param s
     * @param rs
     * @throws SQLException
     */
    public static void close(Connection conn, Statement s, ResultSet rs){
        try {
            if (rs != null) rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        try {
            if (s != null) s.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        try {
            if (conn != null) conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 执行数据库查询语句
     * @param sql       查询sql,匿名参数用？表示，命名参数使用“：参数名”表示
     * @param params    查询参数
     * @return
     * @throws SQLException
     */
    @SuppressWarnings("unchecked")
    public static List<Map<String,Object>> select(Object sql,Object... params) throws SQLException{
        Object result=DBUtil.executeSql(sql,params);
        if(result==null){
            return null;
        }else{
            return (List<Map<String,Object>>)result;
        }
    }
    
    /**
     * 执行插入
     * @param sql
     * @param params
     * @return
     * @throws SQLException
     */
    public static int insert(Object sql,Object... params) throws SQLException{
        return DBUtil.update(sql, params);
    }
    
    /**
     * 执行数据库记录变更语句（增，删，改）
     * @param sql       查询sql,匿名参数用？表示，命名参数使用“：参数名”表示
     * @param params    查询参数
     * @return
     * @throws SQLException
     */
    public static int update(Object sql,Object... params) throws SQLException{
        Object result=DBUtil.executeSql(sql,params);
        if(result==null){
            return 0;
        }else{
            return (Integer)result;
        }
    }
    
    /**
     * 执行删除
     * @param sql
     * @param params
     * @return
     * @throws SQLException
     */
    public static int delete(Object sql,Object... params) throws SQLException{
        return DBUtil.update(sql, params);
    }
    
    /**
     * 通用Sql执行方法
     * @param sql       查询sql,匿名参数用？表示，命名参数使用“：参数名”表示
     * @param params    命名参数
     * @return
     * @throws SQLException
     */
    public static Object executeSql(Object sql, Object... params) throws SQLException {
 
        if(sql==null||"".equals(sql.toString().trim())) throw new SQLException("sql语句为空！");
        
        //获取sql语句
        String sqlStr=sql.toString().trim();
        
        //处理命名参数
        if(params!=null&¶ms.length==1&¶ms[0] instanceof Map){
            List<Object> pList=new ArrayList<Object>();
            Map<String,Object> pMap=(Map<String, Object>)params[0];
            Matcher pMatcher = Pattern.compile(":(//w+)").matcher(sqlStr);
            while(pMatcher.find()){
                String pName=pMatcher.group(1);
                pList.add(pMap.get(pName));
            }
            
            sqlStr=pMatcher.replaceAll("?");
            params=pList.toArray();
        }
        
        Connection conn = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            conn = DBUtil.getConnection();
            ps = conn.prepareStatement(sqlStr);
             
            if (null != params) {
                //初始化查询参数
                for(int i=0;i<params.length;i++){
                    Object param = params[i];
                    if(param!=null){
                        ps.setObject(i+1,param);
                    }else{
                        ps.setNull(i+1,Types.NULL);
                    }
                    
                }
            }
            
            //处理结果集
            boolean isResultSet = ps.execute();
            List<Object> result = new ArrayList<Object>();
            do {
                if (isResultSet) {
                    List<Map<String,Object>> tableData=new ArrayList<Map<String,Object>>();
                    ResultSet resultSet=ps.getResultSet();
                    while(resultSet.next()){
                        Map<String,Object> rowData=new HashMap<String,Object>();
                        for(int i=1;i<=resultSet.getMetaData().getColumnCount();i++){
                            rowData.put(resultSet.getMetaData().getColumnName(i),resultSet.getObject(i));
                        }
                        tableData.add(rowData);
                    }
                    result.add(tableData);
                } else {
                    result.add(new Integer(ps.getUpdateCount()));
                }
            } while ((isResultSet = ps.getMoreResults()) == true || ps.getUpdateCount() != -1);
 
            //处理返回结果
            if (result.size() == 0) {
                return null;
            } else if (result.size() == 1) {
                return result.get(0);
            } else {
                return result;
            }
        } catch (SQLException e) {
            throw new SQLException("无效sql!-->"+sql);
        } finally {
            DBUtil.close(conn, ps, rs);
        }
    }
}

package com.hongyuan.core;
 
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
 
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
@SuppressWarnings("serial")
public class WebServlet extends HttpServlet {
 
    protected HttpServletRequest request=null;
    protected HttpServletResponse response=null;
    protected Map<String,String> cfgParams=new HashMap<String,String>();
    
    /**
     * 默认访问方法
     * @throws Exception
     */
    public void initPage() throws Exception{}
    
    @Override
    public final void init(ServletConfig config) throws ServletException {
        @SuppressWarnings("unchecked")
        Enumeration<String> names = config.getInitParameterNames();
        while(names.hasMoreElements()){
            String name=names.nextElement();
            if(name.startsWith("Bean_")){
                //为servlet注入Bean对象
                String beanName=name.substring("Bean_".length());
                String beanClass=config.getInitParameter(name);
                
                    try {
                        if(beanClass==null||"".equals(beanClass.trim())) throw new Exception("未配置类名！-->"+beanName);
                        
                        Object bean = Class.forName(beanClass).newInstance();
                        this.getClass().getField(beanName).set(this,bean);
                    } catch (InstantiationException e) {
                        try {
                            throw new InstantiationException("无法实例化（"+beanClass+"）!");
                        } catch (InstantiationException e1) {
                            e1.printStackTrace();
                        }
                    } catch (ClassNotFoundException e) {
                        try {
                            throw new ClassNotFoundException("未找到类-->"+beanClass);
                        } catch (ClassNotFoundException e1) {
                            e1.printStackTrace();
                        }
                    } catch (NoSuchFieldException e) {
                        try {
                            throw new NoSuchFieldException("未找到Bean声明字段（"+beanName+"）");
                        } catch (NoSuchFieldException e1) {
                            e1.printStackTrace();
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                
            }else{
                cfgParams.put(name,config.getInitParameter(name));
            }
        }
    }
    
    @Override
    public final void service(HttpServletRequest request, HttpServletResponse response){
        
        this.request=request;
        this.response=response;
        
        String encoding=null;
        try {
            encoding=cfgParams.get("encoding");
            if(encoding==null||"".equals(encoding.trim())) encoding="utf-8";
            request.setCharacterEncoding(encoding);
            response.setCharacterEncoding(encoding);
        } catch (UnsupportedEncodingException e2) {
            try {
                throw new UnsupportedEncodingException("不支持的字符集("+encoding+")");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
        }
        
        String action=null;
        try {
            //根据路由参数将请求转交到指定方法执行
            String routeParam=cfgParams.get("routeParam");
            action=this.get((routeParam==null||"".equals(routeParam))?"action":routeParam,"initPage");
            this.getClass().getMethod(action).invoke(this);
        } catch (IllegalAccessException e) {
            try {
                throw new IllegalAccessException("方法（"+action+"）拒绝访问!");
            } catch (IllegalAccessException e1) {
                e1.printStackTrace();
            }
        } catch (NoSuchMethodException e) {
            try {
                throw new NoSuchMethodException("未找到方法("+action+")!");
            } catch (NoSuchMethodException e1) {
                e1.printStackTrace();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 展示指定页面
     * @param page
     * @throws IOException
     * @throws ServletException
     */
    protected void show(String page){
        String pagePath=cfgParams.get("pagePath");
        try {
            request.getRequestDispatcher(((pagePath==null||"".equals(pagePath))?"/WEB-INF/pages/":pagePath)+page).forward(request,response);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 打印指定字符串
     * @param str
     * @throws IOException
     */
    protected void print(String str){
        try {
            response.getWriter().print(str);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 获取指定名称的请求参数
     * @param name
     * @param def
     * @return
     */
    protected String get(String name,String def){
        String value=request.getParameter(name);
        if(value!=null&&!"".equals(value.trim())){
            return value;
        }else{
            return def;
        }
    }
    
    /**
     * 向页面输出指定参数
     * @param name
     * @param value
     */
    protected void put(String name,Object value){
        request.setAttribute(name,value);
    }
    
}

package com.hongyuan.talk.cfg;
 
public enum Sql {
    //提取用户信息SQL语句
    GET_USERINFO("select id,user_name,password from user where user_name=:userName and password=md5(:password)"),
    
    //保存用户信息SQL语句
    SAVE_USER("insert into user(user_name,password) values(:userName,md5(:password))");
    
    private final String value;
    private Sql(String value){
        this.value=value;
    }
    
    public String getValue(){
        return this.value;
    }
    
    @Override
    public String toString() {
        return this.value;
    }
}

package com.hongyuan.talk;
 
import java.sql.SQLException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
import com.hongyuan.core.DBUtil;
import com.hongyuan.talk.cfg.Sql;
 
public class TalkBean{
 
    /**
     * 提取用户信息
     * @param userName
     * @param password
     * @return
     */
    public Map<String,Object> getUserInfo(final String userName,final String password) {
 
        try {
            List<Map<String,Object>> userInfo=DBUtil.select(Sql.GET_USERINFO,new HashMap<String,Object>(){{
                put("userName",userName);
                put("password",password);
            }});
            if(userInfo!=null&&userInfo.size()==1){
                return userInfo.get(0);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
 
    /**
     * 保存用户信息
     * @param userName
     * @param password
     * @return
     */
    public boolean saveUser(final String userName,final String password){
        try {
            int count=DBUtil.insert(Sql.SAVE_USER,new HashMap<String,Object>(){{
                put("userName",userName);
                put("password",password);
            }});
            if(count==1){
                return true;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return false;
    }
}

package com.hongyuan.talk;
 
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Map;
 
import nl.justobjects.pushlet.core.Dispatcher;
import nl.justobjects.pushlet.core.Event;
 
import com.hongyuan.core.WebServlet;
 
public class TalkServlet extends WebServlet {
 
    public TalkBean talkBean;
            
    @Override
    public void initPage(){
        Object userInfo = request.getSession().getAttribute("userInfo");
        if(userInfo!=null){
            talkPage();
        }else{
            loginPage();
        }
    }
    
    //进入登陆页面
    public void loginPage(){
        show("login.jsp");
    }
    
    //进入注册页面
    public void regPage(){
        show("reg.jsp");
    }
    
    //登录
    public void login() throws IOException{
        String userName=this.get("userName","");
        String password=this.get("password","");
        if(!"".equals(userName)&&!"".equals(password)){
            //提取用户信息
            Map<String,Object> userInfo=talkBean.getUserInfo(userName, password);
            if(userInfo!=null){
                //将用户信息存入session
                request.getSession().setAttribute("userInfo",userInfo);
                response.sendRedirect("./talkService.srv?action=talkPage");
                return;
            }
        }
        show("login.jsp");
    }
    
    //注册
    public void reg() throws IOException{
        String userName=this.get("userName","");
        String password=this.get("password","");
        String passConfirm=this.get("passConfirm","");
        if(!"".equals(userName)&&!"".equals(password)&&password.equals(passConfirm)){
            if(talkBean.saveUser(userName, password)){
                response.sendRedirect("./talkService.srv?action=loginPage");
                return;
            }
        }
        show("reg.jsp");
    }
    
    //进入聊天页面
    public void talkPage(){
        Object userInfo = request.getSession().getAttribute("userInfo");
        if(userInfo!=null){
            Map<String,Object> info=(Map<String,Object>)userInfo;
            this.put("userName",info.get("user_name"));
            show("talk.jsp");
            return;
        }
        show("login.jsp");
    }
    
    //发送消息
    public void sendMsg() throws UnsupportedEncodingException{
        String msg=this.get("message","");
        if(!"".equals(msg)){
            Event event=Event.createDataEvent("/message/world");
            
            Object userInfo = request.getSession().getAttribute("userInfo");
            if(userInfo!=null){
                Map<String,Object> info=(Map<String,Object>)userInfo;
                event.setField("userName",new String(info.get("user_name").toString().getBytes("utf-8"),"iso-8859-1"));
            }
            event.setField("message",new String(msg.getBytes("utf-8"),"iso-8859-1"));
            
            Dispatcher.getInstance().multicast(event);
        }
    }
}