Java经典封装JDBC模板(充分体现面向对象思想)(转)

程序清单一览

bean类

 package com.software.usermanager.bean;

 public class Users {
     private String id;
     private String name;
     private String age;
     public String getId() {
         return id;
     }
     public void setId(String id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public String getAge() {
         return age;
     }
     public void setAge(String age) {
         this.age = age;
     }

 }

dao类

 package com.software.usermanager.dao;

 import com.software.usermanager.bean.Users;
 import com.software.usermanager.util.PageModel;
 import java.util.List;

 public interface UsersDAO {
     public boolean insert(Users user);    //增
     public boolean delete(String id);   //单条删除
     public boolean delete(String[] userIds);  //批量删除
     public boolean update(Users user);  //修改
     public List<Users> query();     //全部查询
     public Users query(String id);  //单记录查询
     public PageModel query(int pageNo, int pageSize); //分页查询
     public PageModel query(int pageNo, int pageSize,String condition); //分页模糊查询
     public boolean Login(String name,String password); //登录

 }

daoimpl类

 package com.software.usermanager.dao;
 import com.software.usermanager.util.OptTemplate;
 import java.sql.ResultSet;
 import java.util.List;

 import com.software.usermanager.bean.Users;
 import com.software.usermanager.util.*;

 public class UsersDAOImpl implements UsersDAO {

     private OptTemplate optTemplate = null;

     public UsersDAOImpl(OptTemplate optTemplate) {
         super();
         this.optTemplate = optTemplate;
     }
     public boolean Login(String name, String password) {
         // TODO Auto-generated method stub
         return false;
     }

     public boolean delete(String id) {
         String sql = "delete from users where id=?";
         Object[] obj = { id };
         return optTemplate.update(sql, obj, false);
     }

     public boolean delete(String[] userIds) {
         StringBuffer sbStr = new StringBuffer();
         Object[] obj = userIds;
         ;
         for (int i = 0; i < userIds.length; i++) {
             sbStr.append("?,");
         }
         String sql = "delete from users where id in("
                 + sbStr.substring(0, sbStr.length() - 1) + ")";
         return optTemplate.update(sql, obj, false);
     }

     public boolean insert(Users user) {
         String sql = "insert into users(id,name,age) values(?,?,?)";
         Object[] obj = {user.getId(),user.getName(),user.getAge()};
         return optTemplate.update(sql, obj, false);
     }

     @SuppressWarnings("unchecked")
     public List<Users> query() {
         String sql = "select * from users";
         Object[] obj = {};
         return (List<Users>) optTemplate.query(sql, obj, new UsersDAOObjectMapper());

     }

     public Users query(String id) {
         String sql = "select * from users";
         Object[] obj = {};
         return (Users) optTemplate.query(sql, obj, new UsersDAOObjectMapper()).get(0);
     }

     public PageModel query(int pageNo, int pageSize) {
         String sql1 = "select * from users";
         Object[] obj1 = {};
         List<Users> list1 = (List<Users>) optTemplate.query(sql1, obj1,
                 new UsersDAOObjectMapper());
         int i = list1.size();
         String sql="select * from (select j.*,rownum rn from (select * from users) j where rownum<=?) where rn>?";
         Object[] obj = {pageNo * pageSize, (pageNo - 1) * pageSize};
         List<Users> list = (List<Users>) optTemplate.query(sql, obj,
                 new UsersDAOObjectMapper());
         PageModel pagemodel = new PageModel();
         pagemodel.setPageNo(pageNo);
         pagemodel.setPageSize(pageSize);
         pagemodel.setList(list);
         pagemodel.setTotalRecords(i);
         return pagemodel;
     }

     public PageModel query(int pageNo, int pageSize, String condition) {
         String sql1 = "select * from users";
         Object[] obj1 = {};
         List<Users> list1 = (List<Users>) optTemplate.query(sql1, obj1,
                 new UsersDAOObjectMapper());
         int i = list1.size();
         String sql="select * from (select j.*,rownum rn from (select * from users where id like '"+condition+"%' or name like '"+condition+"%') j where rownum<=?) where rn>?";
         Object[] obj = {pageNo * pageSize, (pageNo - 1) * pageSize};
         List<Users> list = (List<Users>) optTemplate.query(sql, obj,
                 new UsersDAOObjectMapper());
         PageModel pagemodel = new PageModel();
         pagemodel.setPageNo(pageNo);
         pagemodel.setPageSize(pageSize);
         pagemodel.setList(list);
         pagemodel.setTotalRecords(i);
         return pagemodel;
     }

     public boolean update(Users user) {
         String sql = "update users set name=?,age=? where id=?";
         Object[] obj = {user.getName(),user.getAge(),user.getId()};
         return optTemplate.update(sql, obj, false);
     }

 }
 class UsersDAOObjectMapper implements ObjectMapper{
     public Object mapping(ResultSet rs){
         Users u=new Users();
             try{

                 u.setId(rs.getString("id"));
                 u.setName(rs.getString("age"));
                 u.setName(rs.getString("name"));

             }catch(Exception ex){
                 ex.printStackTrace();
             }

         return u;
     }

 }

util类

 package com.software.usermanager.util;
 import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
 import java.util.ArrayList;
 import java.util.List;

 import com.software.usermanager.db.DBConnection;

 public class OptTemplate {
     public Object find(String sql,Object[] obj,ObjectMapper mapper){
         Object o=null;
         Connection conn=null;
         PreparedStatement pstmt=null;
         try{
             conn=DBConnection.getConn();
             pstmt=conn.prepareStatement(sql);
             for(int i=0;i<obj.length;i++){
                 pstmt.setObject(i+1, obj[i]);
                 ResultSet rs=pstmt.executeQuery();
                 if(rs.next()){
                     o=mapper.mapping(rs);
                 }
             }
             }catch(Exception ex){
                 ex.printStackTrace();
             }finally{
                 try{
                     pstmt.close();
                     conn.close();
                 }catch(SQLException ex){
                     ex.printStackTrace();
                 }
             }
             return o;
         }

     public List<? extends Object> query(String sql,Object[] obj,ObjectMapper mapper){
         Object o=null;
         List<Object> list=new ArrayList<Object>();
         Connection conn=null;
         PreparedStatement pstmt=null;
         try{
             conn=DBConnection.getConn();
             pstmt=conn.prepareStatement(sql);
             for(int i=0;i<obj.length;i++){
                 pstmt.setObject(i+1, obj[i]);
             }
                 ResultSet rs=pstmt.executeQuery();

                 while(rs.next()){

                     o=mapper.mapping(rs);
                     list.add(o);
                 }

         }catch(SQLException ex){
             ex.printStackTrace();
         }finally{
             try{
                 pstmt.close();
                 conn.close();
             }catch(SQLException ex){
                 ex.printStackTrace();
             }
         }
         return list;
     }
     public boolean update(String sql,Object[] obj,boolean isGenerateKey){
         Connection conn=null;
         PreparedStatement pstmt=null;
         boolean bFlag=false;
         try{
             conn=DBConnection.getConn();
             pstmt=isGenerateKey ? conn.prepareStatement(sql,Statement.RETURN_GENERATED_KEYS):conn.prepareStatement(sql);
             for(int i=0;i<obj.length;i++){
                 pstmt.setObject(i+1, obj[i]);
             }
             conn.setAutoCommit(false);
             int i=pstmt.executeUpdate();
             conn.commit();
             if(i>0)
                 bFlag=true;
         }catch(SQLException ex){
             ex.printStackTrace();
         }finally{
             try{
                 conn.close();
                 pstmt.close();

             }catch(SQLException ex){
                 ex.printStackTrace();
             }
         }
         return bFlag;
     }

 }

 package com.software.usermanager.util;

 import java.sql.ResultSet;

 public interface ObjectMapper {
     public Object mapping(ResultSet rs);

 }

分页封装类

 package com.software.usermanager.util;

 import java.util.List;

 public class PageModel<T> {

     //结果集
     private List<T> list;

     //记录数
     private int totalRecords;

     //每页多少条数据
     private int pageSize;

     //第几页
     private int pageNo;

     /**
      * 返回总页数
      * @return
      */
     public int getTotalPages() {
         return (totalRecords + pageSize - 1) / pageSize;
     }

     /**
      * 首页
      * @return
      */
     public int getTopPageNo() {
         return 1;
     }

     /**
      * 上一页
      * @return
      */
     public int getPreviousPageNo() {
         if (this.pageNo <= 1) {
             return 1;
         }
         return this.pageNo - 1;
     }

     /**
      * 下一页
      * @return
      */
     public int getNextPageNo() {
         if (this.pageNo >= getButtomPageNo()) {
             return getButtomPageNo();
         }
         return this.pageNo + 1;
     }

     /**
      * 尾页
      * @return
      */
     public int getButtomPageNo() {
         return getTotalPages();
     }

     public List<T> getList() {
         return list;
     }

     public void setList(List<T> list) {
         this.list = list;
     }

     public int getTotalRecords() {
         return totalRecords;
     }

     public void setTotalRecords(int totalRecords) {
         this.totalRecords = totalRecords;
     }

     public int getPageSize() {
         return pageSize;
     }

     public void setPageSize(int pageSize) {
         this.pageSize = pageSize;
     }

     public int getPageNo() {
         return pageNo;
     }

     public void setPageNo(int pageNo) {
         this.pageNo = pageNo;
     }
 }

数据库配置文件dbconf.properties

 #oracle连接实例
 driverClass = oracle.jdbc.driver.OracleDriver
 url = jdbc:oracle:thin:@192.168.137.23:1521:orcl

 username = 用户名
 password = 密码

数据库封装类

 package com.software.usermanager.db;

 import java.io.IOException;
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.SQLException;
 import java.util.Properties;

 public class DBConnection {

     private static Connection conn = null;
     private static Properties props = null;

     static {
         props = new Properties();
         try {
             props.load(DBConnection.class.getResourceAsStream("/dbconf.properties"));
         } catch (IOException e1) {
             e1.printStackTrace();
         }
         try {
             Class.forName(props.getProperty("driverClass"));
         } catch (ClassNotFoundException e) {
             e.printStackTrace();
         }
     }

     public static Connection getConn(){
         try {
             conn = DriverManager.getConnection(props.getProperty("url"), props.getProperty("username"), props.getProperty("password"));
             conn.setAutoCommit(false);
         } catch (SQLException e) {
             e.printStackTrace();
         }
         return conn;
     }

     public void closeConn(){
         try {
             if (conn != null)
                 conn.close();
         } catch (SQLException e) {
             e.printStackTrace();
         }

     }
 }

junit测试类

 package com.software.usermanager.test;

 import java.util.List;

 import com.software.usermanager.bean.Users;

 import org.apache.tomcat.jni.User;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;

 import com.software.usermanager.dao.UsersDAO;
 import com.software.usermanager.dao.UsersDAOImpl;
 import com.software.usermanager.db.DBConnection;
 import com.software.usermanager.util.OptTemplate;
 import com.software.usermanager.util.PageModel;

 public class UserTest {
     DBConnection dbConn = null;

     @Before
     public void setUp() {
         dbConn = new DBConnection();
     }

     @After
     public void tearDown() {
         dbConn.closeConn();

     }
     /************测试插入记录***************/

 //    @Test
 //    public void testinsert() {
 //        UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
 //        for(int i=0;i<20;i++){
 //        Users u = new Users();
 //        u.setId(""+i);
 //        u.setName("郑六");
 //        u.setAge("2"+i);
 //        boolean b=usersdao.insert(u);
 //        if(b==false){
 //            System.out.println("插入失败");
 //        }else{
 //            System.out.println("插入成功");
 //        }}
 //
 //
 //    }
     /************测试修改记录***************/

 //    @Test
 //    public void testupdate() {
 //        UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
 //        Users u = new Users();
 //        u.setId("5");
 //        u.setName("郑六");
 //        u.setAge("21");
 //        boolean b=usersdao.update(u);
 //        if(b==false){
 //            System.out.println("更新失败");
 //        }else{
 //            System.out.println("更新成功");
 //        }
 //
 //
 //    }
     /************测试删除单条记录***************/

 //    @Test
 //    public void testdeleteById() {
 //        UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
 //        boolean b=usersdao.delete("2");
 //        if(b==false){
 //            System.out.println("删除失败");
 //        }else{
 //            System.out.println("删除成功");
 //        }
 //
 //    }
     /************测试批量删除记录***************/
 //
 //    @Test
 //    public void testdeleteByArray() {
 //        UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
 //        String[] s={"3","4","5"};
 //        boolean b=usersdao.delete(s);
 //        if(b==false){
 //            System.out.println("删除失败");
 //        }else{
 //            System.out.println("删除成功");
 //        }
 //
 //    }
     /*********查询全部记录结果集为泛型 ************/
 //    @Test
 //    public void testqueryAll(){
 //        UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
 //        List<Users> list=usersdao.query();
 //        for(Users u:list){
 //            System.out.println(u.getId());
 //        }
 //    }
     /*********查询单条记录结果集为对象 ************/
 //    @Test
 //    public void testqueryAll(){
 //        UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
 //        Users u=usersdao.query("7");
 //        System.out.println(u.getName());
 //
 //    }
 //    /*********分页查询全部记录结果集为pagemodel************/
 //    @Test
 //    public void testqueryAll(){
 //        UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
 //        PageModel pml=usersdao.query(2,2);
 //        List<Users> list=pml.getList();
 //        for(Users u:list){
 //            System.out.println(u.getId());
 //        }
 //    }
     /*********分页模糊查询全部记录结果集为pagemodel************/
     @Test
     public void testqueryAll(){
         UsersDAO usersdao = new UsersDAOImpl(new OptTemplate());
         PageModel pml=usersdao.query(1,2,"2");
         List<Users> list=pml.getList();
         for(Users u:list){
             System.out.println(u.getId());
         }
     }

 }

注意:以下代码非本程序必须代码,仅供自己笔记之用

Filter

 package com.software.usermanager.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;

     public class FilterEncoding implements Filter {

         private String encoding = "utf-8";
         public void destroy() {

         }

         public void doFilter(ServletRequest request, ServletResponse response,
                 FilterChain arg2) throws IOException, ServletException {
             request.setCharacterEncoding(encoding);
             response.setCharacterEncoding(encoding);
             arg2.doFilter(request, response);

         }

         public void init(FilterConfig arg0) throws ServletException {
             encoding = arg0.getInitParameter("encoding");
         }

     }

Listener

 package com.software.usermanager.listener;

 import java.util.Date;

 import javax.servlet.ServletContextEvent;
 import javax.servlet.ServletContextListener;

 public class Listener implements ServletContextListener
 {
     public void contextDestroyed(ServletContextEvent event)
     {
         // 销毁记录
     }

     public void contextInitialized(ServletContextEvent event)
     {
         // 记录登录信息
         Date date = new Date();
         event.getServletContext().log(date.toString());
     }
 }

web.xml配置文件

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
     <display-name>xkxt</display-name>
     <welcome-file-list>
         <welcome-file>index.jsp</welcome-file>
     </welcome-file-list>
       <filter>
       <filter-name>Encoding</filter-name>
       <filter-class>com.software.usermanager.FilterEncoding</filter-class>

     <init-param>
     <param-name>encoding</param-name>
     <param-value>UTF-8</param-value>
     </init-param>
      </filter>
        <filter-mapping>
        <filter-name>Encoding</filter-name>
        <url-pattern>/*</url-pattern>
   </filter-mapping>

     <listener>
         <listener-class>com.software.usermanager.Listener</listener-class>
     </listener>
     <servlet>
        <servlet-name>xkxt</servlet-name>
        <servlet-class>com.software.usermanager.XKXTServlet</servlet-class>
     </servlet>
     <servlet-mapping>
       <servlet-name>xkxt</servlet-name>
       <url-pattern>/action</url-pattern>
     </servlet-mapping>
         <servlet>
        <servlet-name>querydqm</servlet-name>
        <servlet-class>com.software.usermanager.DQMServlet</servlet-class>
     </servlet>
     <servlet-mapping>
       <servlet-name>querydqm</servlet-name>
       <url-pattern>/action</url-pattern>
     </servlet-mapping>

 </web-app>