BeanUtils、DBUtils和c3p0组件构建一个java web项目

其他 2020-01-11 11:30:18 阅读次数: 0

BeanUtils、DBUtils和c3p0组件构建一个java web项目

本文是基于Windows 10系统环境，基于BeanUtils、DBUtils和c3p0组件构建一个java web项目

一、目录结构

(1) src的目录结构

在这里插入图片描述

(2) WebRoot的目录结构

在这里插入图片描述

二、各个文件源码

(0) 配置文件

  • db.properties
url=jdbc:mysql://172.30.12.59:3306/day15
user=root
password=123456
driverClass=com.mysql.jdbc.Driver
  • c3p0-config.xml
<c3p0-config>
  <default-config>
    <property name="jdbcUrl">jdbc:mysql://172.30.12.59:3306/day15</property>
    <property name="driverClass">com.mysql.jdbc.Driver</property>
    <property name="user">root</property>
    <property name="password">123456</property>
    <property name="maxIdleTime">3000</property>
    <property name="maxPoolSize">6</property>
    <property name="initialPoolSize">3</property>

  </default-config>


  <named-config name="mysql_config">
    <property name="jdvcUrl">jdbc:mysql://172.30.12.59:3306/day15</property>
    <property name="driverClass">com.mysql.jdbc.Driver</property>
    <property name="user">root</property>
    <property name="password">123456</property>
    <property name="maxIdleTime">3000</property>
    <property name="maxPoolSize">6</property>
    <property name="initialPoolSize">3</property>
    
    <user-overrides user="poop">
      <property name="maxStatements">300</property>
    </user-overrides>
   </named-config>
</c3p0-config>
  • web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>
  <servlet>
    <servlet-name>AdminServlet</servlet-name>
    <servlet-class>com.inspur.servlet.AdminServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>AdminServlet</servlet-name>
    <url-pattern>/AdminServlet</url-pattern>
  </servlet-mapping>	
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

(1) entity实体层

  • Admin.java
/**
 * 
 */
package com.inspur.entity;

/**
 * 1.实体类设计
 * ClassName: Admin
 * Function: TODO ADD FUNCTION
 * @author: xuzheng
 * date: 2019-5-22 上午9:46:45
 */
public class Admin {
	private int id;
	private String userName;
	private String password;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	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;
	}
	@Override
	public String toString() {
		return "Admin [id=" + id + ", userName=" + userName + ", password="
				+ password + "]";
	}
}
  • UserExistsException.java
/**
 * 
 */
package com.inspur.exception;

/**
 * ClassName: UserExistsException
 * Function: TODO ADD FUNCTION
 * @author: xuzheng
 * date: 2019-5-22 ÏÂÎç2:39:37
 */
public class UserExistsException extends Exception {

	/**
	 * 
	 */
	public UserExistsException() {
		// TODO Auto-generated constructor stub
	}

	/**
	 * @param message
	 */
	public UserExistsException(String message) {
		super(message);
		// TODO Auto-generated constructor stub
	}

	/**
	 * @param cause
	 */
	public UserExistsException(Throwable cause) {
		super(cause);
		// TODO Auto-generated constructor stub
	}

	/**
	 * @param message
	 * @param cause
	 */
	public UserExistsException(String message, Throwable cause) {
		super(message, cause);
		// TODO Auto-generated constructor stub
	}

}

(2) dao数据访问层

  • IAdminDao.java
/**
 * 
 */
package com.inspur.dao;

import com.inspur.entity.Admin;

/**
 * 2.数据访问层，接口设计
 * ClassName: IAdminDao
 * Function: TODO ADD FUNCTION
 * @author: xuzheng
 * date: 2019-5-22 上午9:51:20
 */
public interface IAdminDao {
	/*
	 * 保存用户
	 */
	public void save(Admin admin);
	/*
	 * 根据用户名和密码查询
	 */
	public Admin findByNameAndPwd(Admin admin);
	/*
	 * 检查用户名是否存在
	 */
	public boolean userExists(String name);
}
  • AdminDao.java
/**
 * 
 */
package com.inspur.dao.impl;

import java.sql.Connection;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;

import com.inspur.dao.IAdminDao;
import com.inspur.entity.Admin;
import com.mchange.v2.c3p0.ComboPooledDataSource;

/**2.数据访问层，接口实现
 * ClassName: AdminDao
 * Function: TODO ADD FUNCTION
 * @author: xuzheng
 * date: 2019-5-22 上午9:58:44
 */
public class AdminDao implements IAdminDao {
	private Connection conn = null;
	private QueryRunner qr = new QueryRunner();
	/* (non-Javadoc)
	 * @see com.inspur.dao.IAdminDao#save(com.inspur.entity.Admin)
	 */
	public void save(Admin admin) {
		// TODO Auto-generated method stub
		String sql = "insert into user(userName,password) values(?,?)";
		
		try {
			ComboPooledDataSource dataSource = new ComboPooledDataSource();
			conn = dataSource.getConnection();
			qr.update(conn, sql, admin.getUserName(), admin.getPassword());
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			throw new RuntimeException(e);
		} finally{
			try {
				conn.close();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				throw new RuntimeException(e);
			}
		}
		
	}

	/* (non-Javadoc)
	 * @see com.inspur.dao.IAdminDao#findByNameAndPwd(com.inspur.entity.Admin)
	 */
	public Admin findByNameAndPwd(Admin admin) {
		// TODO Auto-generated method stub
		String sql = "select * from user where userName=? and password=?";
		try{
			
			ComboPooledDataSource dataSource = new ComboPooledDataSource();
			conn = dataSource.getConnection();
			Admin ad = qr.query(conn, sql, new BeanHandler<Admin>(Admin.class), admin.getUserName(), admin.getPassword());
			return ad;
		} catch (Exception e){
			throw new RuntimeException(e);
		} finally {
			try {
				conn.close();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				throw new RuntimeException(e);
			}
		}
		
	}

	/* (non-Javadoc)
	 * @see com.inspur.dao.IAdminDao#userExists(java.lang.String)
	 */
	public boolean userExists(String name) {
		// TODO Auto-generated method stub
		String sql = "select id from user where userName=?";
		
		try {
			ComboPooledDataSource dataSource = new ComboPooledDataSource();
			conn = dataSource.getConnection();
			Integer id = qr.query(conn, sql, new ScalarHandler<Integer>(), name);
			
			if(id != null){
				return true;
			}
			return false;
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			throw new RuntimeException(e);
		} finally{
			try {
				conn.close();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				throw new RuntimeException(e);
			}
		}
	}
}

(3) service业务逻辑层

  • IAdminService.java
/**
 * 
 */
package com.inspur.service;

import com.inspur.entity.Admin;
import com.inspur.exception.UserExistsException;

/**
 * 3.业务逻辑层，接口设计
 * ClassName: IAdminService
 * Function: TODO ADD FUNCTION
 * @author: xuzheng
 * date: 2019-5-22 下午2:18:43
 */
public interface IAdminService {
	/*
	 * 注册
	 */
	public void register(Admin admin) throws UserExistsException;
	/*
	 * 登录
	 */
	public Admin login(Admin admin);
}
  • AdminService.java
/**
 * 
 */
package com.inspur.service.impl;

import com.inspur.dao.IAdminDao;
import com.inspur.dao.impl.AdminDao;
import com.inspur.entity.Admin;
import com.inspur.exception.UserExistsException;
import com.inspur.service.IAdminService;

/**
 * ClassName: AdminService
 * Function: TODO ADD FUNCTION
 * @author: xuzheng
 * date: 2019-5-22 下午2:26:14
 */
public class AdminService implements IAdminService {
	private IAdminDao dao = new AdminDao(); 

	/* (non-Javadoc)
	 * @see com.inspur.servlet.IAdminService#register(com.inspur.entity.Admin)
	 */
	public void register(Admin admin) throws UserExistsException{
		// TODO Auto-generated method stub
		try {
			if(dao.userExists(admin.getUserName())){
				System.out.println("用户名已经存在，注册失败");
				throw new UserExistsException("用户名已经存在，注册失败");
			} else{
				dao.save(admin);
			}
		} catch (UserExistsException e) {
			// TODO Auto-generated catch block
			throw e;
		} catch (Exception e) {
			// TODO Auto-generated catch block
			throw new RuntimeException(e);
		} 
	}

	/* (non-Javadoc)
	 * @see com.inspur.servlet.IAdminService#login(com.inspur.entity.Admin)
	 */
	public Admin login(Admin admin) {
		// TODO Auto-generated method stub
		try {
			return dao.findByNameAndPwd(admin);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			throw new RuntimeException(e);
		}
	}
}

(4) control控制层

  • AdminServlet.java
/**
 * 
 */
package com.inspur.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.beanutils.BeanUtils;

import com.inspur.entity.Admin;
import com.inspur.exception.UserExistsException;
import com.inspur.service.IAdminService;
import com.inspur.service.impl.AdminService;

/**
 * ClassName: AdminServlet
 * Function: TODO ADD FUNCTION
 * @author: xuzheng
 * date: 2019-5-22 下午2:49:01
 */
public class AdminServlet extends HttpServlet {
	private IAdminService service = new AdminService();

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String method = request.getParameter("method");
		if("register".equals(method)){
			register(request, response);
		}
		
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		this.doGet(request, response);
	}
	
	private void register(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException{
		
		Admin admin = new Admin();
		try {
			BeanUtils.populate(admin, request.getParameterMap());
			System.out.println(admin);
			service.register(admin);
		} catch (UserExistsException e) { 
			// TODO Auto-generated catch block
			System.out.println("跳转用户存在页面");
			request.setAttribute("message", "用户名已经存在");
			request.getRequestDispatcher("/register.jsp").forward(request, response);
		} catch (Exception e1) {
			System.out.println("跳转错误页面");
			response.sendRedirect(request.getContextPath() + "/error/error.jsp");
		}
	}
}

(5) view视图层

  • index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head> 
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
  </head>
  <body> 
  </body>
</html>
  • register.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>注册</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
  </head>
  <body>
    <form name="form1" action="${pageContext.request.contextPath}/AdminServlet?method=register" method="post">
    	<table>
    		<tr>
    			<td>用户名</td>
    			<td>
    				<input type="text" name="userName"/>
    				${requestScope.message}
    			</td>
    		</tr>
    		<tr>
    			<td>密  码</td>
    			<td><input type="password" name="password"/></td>
    		</tr>
    		<tr>
    			<td colspan="2"><input type="submit" value="提交"/></td>
    		</tr>
    	</table>
    </form>
  </body>
</html>
  • error.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head> 
    <title>错误页面</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
  </head>
  <body>
    系统忙，稍后再试!
  </body>
</html>
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