DAO设计模式例子
2015-05-07 10:10
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1 <!-- 输入界面 -->
2 <%@page contentType="text/html" pageEncoding="GBK"%>
3 <html>
4 <head>
5 </head>
6 <% request.setCharacterEncoding("GBK"); //解决乱码问题 %>
7
8
9 <body>
10 <form action="emp_insert_do.jsp" method="post">
11 empno:<input type="text" name="empno"><br>
12
13 ename:<input type="text" name="ename"><br>
14
15 job: <input type="text" name="job"><br>
16
17 hiredate: <input type="text" name="hiredate"><br>
18
19 sal: <input type="text" name="sal"><br>
20
21
22 <input type="submit" value = "submit">
23 <input type="reset" value = "reset">
24 </form>
25 </body>
26 </html>1 <!-- 后台插入数据 -->
2 <%@page import="info.haowei.Dao.factory.DAOFactory"%>
3 <%@page import="java.text.SimpleDateFormat"%>
4 <%@page import="info.haowei.Dao.vo.Emp"%>
5 <%@page contentType="text/html" pageEncoding="GBK"%>
6 <html>
7 <head>
8 </head>
9 <% request.setCharacterEncoding("GBK"); //解决乱码问题 %>
10
11
12 <body>
13 <%
14 Emp emp = new Emp();
15 emp.setEmpno(Integer.parseInt(request.getParameter("empno")));
16 emp.setEname(request.getParameter("ename"));
17 emp.setJob(request.getParameter("job"));
18
19 emp.setHiredate((new SimpleDateFormat("yyyy-MM-dd")).parse(request.getParameter("hiredate")));
20 emp.setSal(Float.parseFloat(request.getParameter("sal")));
21
22 try{
23
24 if(DAOFactory.getIEmpDAOInstance().doCreate(emp)){
25
26
27
28 %>
29
30 <h3>添加成功!!</h3>
31
32 <%
33 }else{
34 %>
35 <h3>添加失败!!!</h3>
36 <%
37 }
38 }catch(Exception e){
39 e.printStackTrace();
40 }
41 %>
42
43 </body>
44 </html>1 //vo类
2 package info.haowei.Dao.vo;
3
4 import java.util.Date;
5
6 public class Emp {
7
8 private int empno;
9 private String ename;
10 private String job;
11 private Date hiredate;
12 private float sal;
13
14 public int getEmpno() {
15 return empno;
16 }
17 public void setEmpno(int empno) {
18 this.empno = empno;
19 }
20 public String getEname() {
21 return ename;
22 }
23 public void setEname(String ename) {
24 this.ename = ename;
25 }
26 public String getJob() {
27 return job;
28 }
29 public void setJob(String job) {
30 this.job = job;
31 }
32 public Date getHiredate() {
33 return hiredate;
34 }
35 public void setHiredate(Date hiredate) {
36 this.hiredate = hiredate;
37 }
38 public float getSal() {
39 return sal;
40 }
41 public void setSal(float sal) {
42 this.sal = sal;
43 }
44
45 }1 //工厂类
2 package info.haowei.Dao.factory;
3
4 import info.haowei.Dao.dao.IEmpDAO;
5 import info.haowei.Dao.dao.proxy.EmpDAOProxy;
6
7 public class DAOFactory {
8
9 public static IEmpDAO getIEmpDAOInstance(){
10 return new EmpDAOProxy();
11 }
12 }1 //操作数据库的类
2 package info.haowei.Dao.dbc;
3
4 import java.sql.Connection;
5 import java.sql.DriverManager;
6 import java.sql.SQLException;
7
8 public class DatabaseConnection {
9
10 private static final String DBDRIVER = "org.gjt.mm.mysql.Driver";
11 public static final String DBURL = "jdbc:mysql://localhost:3306/zhw";
12 public static final String DBUSER = "root";
13 public static final String DBPASS = "root";
14 private Connection conn;
15
16 public DatabaseConnection() {
17 try {
18 Class.forName(DBDRIVER);
19 this.conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
20 } catch (ClassNotFoundException e) {
21 e.printStackTrace();
22 } catch (SQLException e) {
23 e.printStackTrace();
24 }
25 }
26
27 public Connection getConnection() {
28 return this.conn;
29 }
30
31 public void close() {
32 if (this.conn != null) {
33 try {
34 this.conn.close();
35 } catch (SQLException e) {
36 e.printStackTrace();
37 }
38 }
39 }
40
41 }1 //代理类.相当于回调吧
2 package info.haowei.Dao.dao.proxy;
3
4 import java.util.List;
5
6 import info.haowei.Dao.dao.IEmpDAO;
7 import info.haowei.Dao.dao.impl.EmpDAOImpl;
8 import info.haowei.Dao.dbc.DatabaseConnection;
9 import info.haowei.Dao.vo.Emp;
10
11 //代理
12 public class EmpDAOProxy implements IEmpDAO {
13
14 private DatabaseConnection dbc = null;
15 private IEmpDAO dao = null;
16
17 public EmpDAOProxy() {
18 this.dbc = new DatabaseConnection();
19 this.dao = new EmpDAOImpl(this.dbc.getConnection());
20 }
21
22 public boolean doCreate(Emp emp) {
23 boolean flag = false;
24 try {
25 if(this.dao.findById(emp.getEmpno())==null){
26 flag = this.dao.doCreate(emp);
27 }
28
29 } catch (Exception e) {
30
31 } finally {
32 dbc.close();
33 }
34
35 return flag;
36 }
37
38 public List<Emp> findAll(String keyword) {
39 List<Emp>all = null;
40 try {
41 all = this.dao.findAll(keyword);
42 } catch (Exception e) {
43
44 } finally {
45 dbc.close();
46 }
47 return all;
48 }
49
50 public Emp findById(int empno) {
51 Emp emp = null;
52 try {
53 emp = this.dao.findById(empno);
54 } catch (Exception e) {
55
56 } finally {
57 dbc.close();
58 }
59 return emp;
60 }
61 }1 //接口实现类,具体操作封装类
2 package info.haowei.Dao.dao.impl;
3
4 import java.sql.Connection;
5 import java.sql.PreparedStatement;
6 import java.sql.ResultSet;
7 import java.sql.SQLException;
8 import java.util.ArrayList;
9 import java.util.List;
10
11 import javax.swing.text.html.HTMLDocument.HTMLReader.PreAction;
12
13 import info.haowei.Dao.dao.IEmpDAO;
14 import info.haowei.Dao.vo.Emp;
15
16 public class EmpDAOImpl implements IEmpDAO{
17
18
19 private Connection conn = null;
20 private PreparedStatement pstmt = null;
21 public EmpDAOImpl(Connection conn){
22 this.conn = conn;
23 }
24
25
26
27
28
29
30 public boolean doCreate(Emp emp) {
31
32 boolean flag = false;
33 String sql = "Insert into emp (empno,ename,job,hiredate,sal)Values(?,?,?,?,?)";
34
35 try {
36 this.pstmt = this.conn.prepareStatement(sql);
37 this.pstmt.setInt(1,emp.getEmpno());
38 this.pstmt.setString(2, emp.getEname());
39 this.pstmt.setString(3, emp.getJob());
40 this.pstmt.setDate(4, new java.sql.Date(emp.getHiredate().getTime()));
41 this.pstmt.setFloat(5, emp.getSal());
42 if(this.pstmt.executeUpdate()>0){//如果存在更新
43 flag = true;
44 }
45 this.pstmt.close();
46 } catch (SQLException e) {
47 e.printStackTrace();
48 }
49 return flag;
50 }
51
52 public List<Emp> findAll(String keyword) {
53 List<Emp>all = new ArrayList<Emp>();
54 String sql = "select empno,ename,job,hiredate,sal from emp where ename like ? or job like ?";
55 try {
56 this.pstmt = this.conn.prepareStatement(sql);
57 this.pstmt.setString(1,"%"+keyword+"%");
58 this.pstmt.setString(2,"%"+keyword+"%");
59 ResultSet rs = this.pstmt.executeQuery();
60 Emp emp = null;
61 while(rs.next()){
62 emp = new Emp();
63 emp.setEmpno(rs.getInt(1));
64 emp.setEname(rs.getString(2));
65 emp.setJob(rs.getString(3));
66 emp.setHiredate(rs.getDate(4));
67 emp.setSal(rs.getFloat(5));
68 all.add(emp);
69 }
70
71 this.pstmt.close();
72 } catch (SQLException e) {
73 e.printStackTrace();
74 }
75 return all;
76
77
78 }
79
80 public Emp findById(int empno) {
81 Emp emp = null;
82 String sql = "select empno,ename,job,hiredate,sal from emp where empno=?";
83 try {
84 this.pstmt = this.conn.prepareStatement(sql);
85 this.pstmt.setInt(1, empno);
86 ResultSet rs = this.pstmt.executeQuery();
87 if(rs.next()){
88 emp = new Emp();
89 emp.setEmpno(rs.getInt(1));
90 emp.setEname(rs.getString(2));
91 emp.setJob(rs.getString(3));
92 emp.setHiredate(rs.getDate(4));
93 emp.setSal(rs.getFloat(5));
94 }
95 this.pstmt.close();
96 } catch (SQLException e) {
97 e.printStackTrace();
98 }
99 return emp;
100 }
101
102
103 }1 //操作接口
2 package info.haowei.Dao.dao;
3
4 import java.util.List;
5
6 import info.haowei.Dao.vo.Emp;
7
8 public interface IEmpDAO {
9
10 public boolean doCreate(Emp emp);
11 public List<Emp>findAll(String keyword);
12 public Emp findById(int empno);
13
14 }1 //主函数类
2
3 package info.haowei.Dao.test;
4
5 import java.util.Date;
6 import java.util.Iterator;
7 import java.util.List;
8
9 import info.haowei.Dao.factory.DAOFactory;
10 import info.haowei.Dao.vo.Emp;
11
12 public class DAOTest {
13
14 public static void main(String[] args) {
15
16 /*
17 * 插入
18 Emp emp = null;
19 for(int x = 0 ; x< 5; x++ ){
20 emp = new Emp();
21 emp.setEmpno(1000+x);
22 emp.setEname("zhw"+x);
23 emp.setJob("coding" +x);
24 emp.setHiredate(new Date());
25 emp.setSal(500+x);
26 DAOFactory.getIEmpDAOInstance().doCreate(emp);
27
28 }
29
30 */
31
32 List<Emp>all = DAOFactory.getIEmpDAOInstance().findAll("");
33 Iterator<Emp>iter = all.iterator();
34 while(iter.hasNext()){
35
36 Emp emp = iter.next();
37 System.out.println(emp.getEmpno()+" "+emp.getEname());
38 }
39
40
41 }
42
43 }
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