东软JavaWeb实训记-DAY5-MyBatis框架+jsp传值+登录过滤器

1.Mybatis：jdbc操作数据库的封装持久化框架
a)创建 Mybatis 的配置文件：

b)sql语句放入映射文件中

2.持久化：把瞬时状态的数据和持久状态数据转换的机制

瞬时状态：存放在内存中的临时数据，jvm停止数据丢失
持久状态：存放在硬盘中的数据，不管jvm 数据都在
3.完成持久化的操作：
jdbc:
executeQuery :
executeUpdate :
io流
InputStream
OutPutStream
4.如何使用MyBatis
a)要添加MyBatis需要的jar文件
WEB-INF/lib 中
b)添加操作数据的驱动包
WEB-INF/lib
c)在 src 下创建mybatis的配置文件，以 xml 格式编译
d)创建对应表的映射文件，用于编写相应的sql语句
必须把该映射文件添加到配置文件中

e)编写java代码完成数据库操作

api：应用程序接口，列出所有的类结构

5.如果把配置文件引用的dtd 设置为本地访问
dtd 通常使用的是一个网址
把网址映射为本地的一个文件
a)先找到那个文件
b)再把文件与 dtd 使用的网址关联
6.MyBatis 操作数据库的步骤
a)创建配置文件
b)创建映射文件，并在配置文件中配置
c)在java类中读取配置文件
d)根据读取的配置文件创建 SqlSessionFactory 对象
e)从SqlSessionFactory 中打开 SqlSession 数据库链接
f)调用SqlSession中的方法
insert
delete
update
select
g)关闭SqlSession链接

只要jsp 显示的数据来自于数据库中，那么必须先访问serlvet 在跳转到jsp中显示

如何实现两个系统共享数据
oa
crm
操作同一个数据库

使用触发器
使用过程

带框架的完整项目结构：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
  <!-- namespace 指的是 该文件中 sql语句访问的位置
  	   通常是文件所在的 包名+文件名
  	   每一个映射文件的namespace 必须 唯一
   -->
<mapper namespace="com.neu.dao.UserInfoDao">
  
  <!-- 向表中添加一行数据  -->
  <!-- #{} 表示获取名为谁的数据
  		#{u_name} 从Map集合中获取 key 为u_name的值
   -->
  <insert id="save" parameterType="java.util.Map">
  	insert into user_info(u_id,u_name,u_sex,u_birth)
  	values(seq_user_id.nextval,#{u_name},#{u_sex},#{u_birth})
  </insert>
  
  <delete id="delete" parameterType="java.util.Map">
  	delete from user_info where 1=1 and u_id in (${u_id})
  	
  </delete>
  
  <update id="update" parameterType="java.util.Map">
  	update user_info set u_name=#{u_name},u_sex=#{u_sex}
  	where u_id=#{u_id}
  </update>
 <!-- 
 	查询到的每一行 用 一个 Map 集合封装
  -->
  <select id="search" resultType="com.neu.util.MyMap" parameterType="Map">
  	select * from user_info where 1=1
  </select>
  
</mapper>

package com.neu.util;

import java.util.HashMap;

public class MyMap extends HashMap {

	@Override
	public Object put(Object key, Object value) {
		return super.put(key.toString().toLowerCase(), value);
	}
}

package test;

import java.io.IOException;
import java.io.Reader;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class Test {

	public static void main(String[] args) {
		try {
			//读取配置文件
			Reader reader=Resources
					.getResourceAsReader("mybatis_conf.xml");
//			创建 链接数据库的工厂类
			SqlSessionFactory factory=
					new SqlSessionFactoryBuilder()
						.build(reader);
//			获取数据库的链接,
//			openSession()获取的session需要自己手动提交事务
//			openSession(true) 获取的session会自动提交事务
			SqlSession session=factory.openSession(true);
			Map<String,String> map=new HashMap<String,String>();
//			map中的key 必须是表中列名
			map.put("u_sex", "女");
			
//			第一个参数：操作sql语句的 命名空间+id
//			第二个参数：sql需要的参数
//			int row=session
//					.insert("com.neu.dao.UserInfoDao.save", map);
			
//			List<Map<String, String>> list=
//					session.selectList("com.neu.dao.UserInfoDao.search",map);
//			System.out.println(list);
//			
//			//session.commit();
//			session.close();
			map=new HashMap<String,String>();
			map.put("u_id", "3,4");
			int row=session.delete("com.neu.dao.UserInfoDao.delete", map);
			System.out.println(row);
			
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
  <environments default="development">
    <environment id="development">
      <transactionManager type="JDBC"/>
      <dataSource type="POOLED">
        <property name="driver" value="oracle.jdbc.driver.OracleDriver"/>
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:shanke"/>
        <property name="username" value="scott"/>
        <property name="password" value="tiger"/>
      </dataSource>
    </environment>
  </environments>
  <mappers>
	<mapper resource="com/neu/dao/UserInfoDao.xml"/>
  </mappers>
</configuration>

更进一步

package com.neu.dao;

import java.util.List;
import java.util.Map;

import org.apache.ibatis.session.SqlSession;

import com.neu.util.MyBatisUtil;

public class BaseDao {

	protected SqlSession session;
	private String nameSpace;
	
	public BaseDao(String nameSpace){
		this.nameSpace=nameSpace;
	}

	protected final void getSession(){
		this.session=MyBatisUtil.getSession();
	}
	protected final void close(){
		MyBatisUtil.close(session);
	}
	
	public final int insert(String id,Object param){
		int row=0;
		try {
			getSession();
			row=session.insert(nameSpace+"."+id, param);
			session.commit();
		} catch (Exception e) {
			throw new RuntimeException(e);
		}finally{
			close();
		}		
		return row;
	}
	public final int update(String id,Object param){
		int row=0;
		try {
			getSession();
			row=session.update(nameSpace+"."+id, param);
			session.commit();
		} catch (Exception e) {
			throw new RuntimeException(e);
		}finally{
			close();
		}		
		return row;
	}
	public final int delete(String id,Object param){
		int row=0;
		try {
			getSession();
			row=session.delete(nameSpace+"."+id, param);
			session.commit();
		} catch (Exception e) {
			throw new RuntimeException(e);
		}finally{
			close();
		}		
		return row;
	}
	public final List<Map<String,String>> search(String id,Object param){
		List<Map<String,String>> list=null;
		try {
			getSession();
			list=session.selectList(nameSpace+"."+id, param);
		} catch (Exception e) {
			throw new RuntimeException(e);
		} finally{
			close();
		}
		return list;
	}
}

package com.neu.dao.impl;

import com.neu.dao.BaseDao;

/**
 * 
 * @author Administrator
 * <p>1.告诉BaseDao使用的nameSpace是什么</p>
 * <p>2.做特殊sql语句的处理</p>
 *
 */
public class UserInfoDao extends BaseDao {

	public UserInfoDao(){
		super("com.neu.dao.UserInfoDao");
	}
	
}

package com.neu.service;

import java.util.Map;

import com.neu.dao.impl.UserInfoDao;

public class UserInfoService {

	private UserInfoDao userInfoDao;
	
	public UserInfoService(){
		this.userInfoDao=new UserInfoDao();
	}
	
	public boolean doSave(Map<String, String[]> params){
		boolean flag=false;
		Map<String,String> map=null;
		//Map<String,String> map=ConvertUtil.convertMap(params);
		try {
			int row =userInfoDao.insert("save", map);
			if(row>0){
				flag=true;
			}
		} catch (Exception e) {
			//使用log4j记录日志
		}
		return flag;
	}
}

package com.neu.util;

import java.util.HashMap;
import java.util.Map;

public class ConvertUtil {

	public static Map<String, String> converterMap(Map<String,String[]> params){
		Map<String, String> map=null;
		if(null != params && params.size()>0){
			map=new HashMap<String, String>();
			for(Map.Entry<String,String[]> entry:params.entrySet()){
				String key=entry.getKey();
				String[] values=entry.getValue();
				String value="";
				if(null != values && values.length>0){
//					String temp=Arrays.toString(values);//
//					temp=temp.replace("[", "").replace("]", "")
//							.replace(" ", "");
					for(String str:values){
						value+=","+str;
					}
					value=value.substring(1);
				}
				map.put(key, value);
			}
			
		}
		return map;
	}
}

package com.neu.util;

import java.security.MessageDigest;

public class Md5Utils {
	static char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
			'a', 'b', 'c', 'd', 'e', 'f' };
	public final static String md5(String s) {

		try {
			byte[] btInput = s.getBytes();
			MessageDigest mdInst = MessageDigest.getInstance("MD5");
			mdInst.update(btInput);
			byte[] md = mdInst.digest();
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}
}

package com.neu.util;

import java.io.IOException;
import java.io.Reader;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class MyBatisUtil {

	private static SqlSessionFactory factory;
	static{
		try {
			Reader reader=Resources
					.getResourceAsReader("mybatis_conf.xml");
			factory=new SqlSessionFactoryBuilder()
					.build(reader);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}
	
	public static SqlSession getSession(){
		if(factory == null){
			throw new RuntimeException("sqlFactroy构建失败");
		}
		SqlSession session=factory.openSession();
		return session;		
	}
	
	public static void close(SqlSession session){
		if(session!=null){
			try {
				session.close();
			} catch (Exception e) {
				e.printStackTrace();
			} finally{
				session=null;
			}
		}
	}
}

package com.neu.util;

import java.util.HashMap;
@SuppressWarnings("all")
public class MyMap extends HashMap {

	@Override
	public Object put(Object key, Object value) {
		// TODO Auto-generated method stub
		return super.put(key.toString().toLowerCase(), value);
	}
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.neu.dao.UserInfoDao">
  
  <!--  map.put("a","zhangsan")
  	#{a} 表示 使用 ？占位符	？  再赋值 为 zhangsan
  	${a} 表示 直接获取数据显示  zhangsan
   -->
  <insert id="save" parameterType="Map">
  	insert into user_info(u_id,u_name,u_sex,u_birth)
  		values(seq_user_id.nextval,#{u_name},#{u_sex},#{u_birth})
  </insert>
  <sql id="">
  	<include refid=""></include>
  </sql>
</mapper>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
  <environments default="development">
    <environment id="development">
      <transactionManager type="JDBC"/>
      <dataSource type="POOLED">
        <property name="driver" value="oracle.jdbc.driver.OracleDriver"/>
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:shanke"/>
        <property name="username" value="scott"/>
        <property name="password" value="tiger"/>
      </dataSource>
    </environment>
  </environments>
  <mappers>
    	<mapper resource="com/neu/dao.UserInfoDao.xml"/>
  </mappers>
</configuration>

关于一些jsp页面的一些东西：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" 
	prefix="c"%>    
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style type="text/css">
	table {
		width: 70%;
		min-width: 500px;
		max-width: 700px;
		border: 1px solid black;
		border-collapse: collapse;
	}
	td{
		border: 1px solid black;
		text-align: center;
	}
	tr:hover{
		background-color: gray;
	}
	
</style>
</head>
<body>
<form action="TeasDeleteServlet" method="post" onsubmit="return checkForm();">
	<!-- 1  T1001  张飞 sasss -->
	<table>
		<tr>
			<td>
				<input type="checkbox" onclick="show(this.checked)">
			</td>
			<td>编号</td>
			<td>姓名</td>
			<td>联系电话</td>
			<td>操作</td>
		</tr>
		<c:forEach items="${sessionScope.teas}" var="tea" varStatus="i">
			<tr>
				<td><!-- 把主键的值 赋值给复选框 -->${i.index }
					<input type="checkbox" id="tea_${tea.tea_id }" name="tea_id" value="${tea.tea_id }">
				</td>
				<td>${tea.tea_no }</td>
				<td>${tea.tea_name }</td>
				<td>${tea.tea_tel }</td>
				<td>
					<a href="#" onclick="doDelete('${tea.tea_id }','${tea.tea_name }')">删除</a>
					<a href="#" onclick="toEdit('${tea.tea_id }')">修改</a>
				</td>
			</tr>
		</c:forEach>
		
		
		<tr>
			<td colspan="5" align="center">
				<input type="submit" value="批量删除">
			</td>
		</tr>
	</table>
</form>
</body>
<script type="text/javascript">
	function show(flag)
	{
		var chs=document.getElementsByName("tea_id");
		for(var i=0;i<chs.length;i++)
		{
			chs[i].checked=flag;
			//chs[i].checked=!chs[i].checked;
		}
	}
	
	function doDelete(id,name)
	{
		show(false);
		document.getElementById("tea_"+id).checked=true;
		var f=confirm("你确定要删除【"+name+"】数据吗？");
		if(f)
		{
			//url 重写
			window.parent.window.location.href="TeasDeleteServlet?tea_id="+id;
		}
	}
	function checkForm()
	{
		var index=0;
		var chs=document.getElementsByName("tea_id");
		for(var i=0;i<chs.length;i++)
		{
			if(chs[i].checked)
			{
				index=1;
				break;
			}
		}
		if(index==0){
			alert("请选择要删除的数据！！！");
			return false;
		}
		var f=confirm("你确定要删除这些数据吗?");
		return f;
	}
	function toEdit(id)
	{
		window.parent.window.location.href="ToEditServlet?tea_id="+id;
	}
</script>
</html>

登录过滤器：

package com.neu.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet Filter implementation class LoginFilter
 */
@WebFilter({ "*.jsp", "/*Servlet"})
public class LoginFilter implements Filter {

    /**
     * Default constructor. 
     */
    public LoginFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req=(HttpServletRequest) request;
		HttpServletResponse resp=(HttpServletResponse) response;
		String uri=req.getRequestURI();
		if(uri.endsWith("login.jsp")
				||uri.endsWith("LoginServlet")
				||uri.endsWith("center.jsp")){
			chain.doFilter(request, response);
		}else{
			HttpSession session=req.getSession();
			Object obj=session.getAttribute("user");
			if(obj==null){
				resp.sendRedirect("center.jsp");
			}else{
				chain.doFilter(request, response);
			}
		}
		
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}

东软JavaWeb实训记-DAY5-MyBatis框架+jsp传值+登录过滤器

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