spring学习整合C3p0小案例
目录
准备代码
C3p0 xml配置文件
获取连接池的工具类
使用junit测试
整合spring部分代码更改：
自己写的类代码块的依赖
注意不能忽略调用包类的依赖（这部分需要看包的源代码）
准备代码
业务层机持久层的分离并且整合C3p0,
导入jar包：
bean类
cn.pro.domain.CustormerBean
package cn.pro.domain;
import java.util.Date;
public class CustormerBean {
private int custormer_id;
private String custormer_name;
private String custormer_add;
private Date custormer_birth;
private int custormer_tel;
private String custormer_sex;
public int getCustormer_id() {
return custormer_id;
}
@Override
public String toString() {
return "CustormerBean [custormer_id=" + custormer_id
+ ", custormer_name=" + custormer_name + ", custormer_add="
+ custormer_add + ", custormer_birth=" + custormer_birth
+ ", custormer_tel=" + custormer_tel + ", custormer_sex="
+ custormer_sex + "]";
}
public void setCustormer_id(int custormer_id) {
this.custormer_id = custormer_id;
}
public String getCustormer_name() {
return custormer_name;
}
public void setCustormer_name(String custormer_name) {
this.custormer_name = custormer_name;
}
public String getCustormer_add() {
return custormer_add;
}
public void setCustormer_add(String custormer_add) {
this.custormer_add = custormer_add;
}
public Date getCustormer_birth() {
return custormer_birth;
}
public void setCustormer_birth(Date custormer_birth) {
this.custormer_birth = custormer_birth;
}
public int getCustormer_tel() {
return custormer_tel;
}
public void setCustormer_tel(int custormer_tel) {
this.custormer_tel = custormer_tel;
}
public String getCustormer_sex() {
return custormer_sex;
}
public void setCustormer_sex(String custormer_sex) {
this.custormer_sex = custormer_sex;
}
}
cn.pro.service.ICustormerService
package cn.pro.service;
import java.util.List;
import cn.pro.domain.CustormerBean;
public interface ICustormerService {
void addcustormer(CustormerBean custormer);
void deletecustormer(int custormer_id);
public CustormerBean getcustormer(String custormer_name);
void updatecustormer(CustormerBean custormer);
public List getall();
}
cn.pro.service.impl.ICustormerServiceImpl
package cn.pro.service.impl;
import java.util.List;
import cn.pro.dao.CustormerDao;
import cn.pro.dao.CustormerDaoImpl;
import cn.pro.domain.CustormerBean;
import cn.pro.service.ICustormerService;
public class ICustormerServiceImpl implements ICustormerService {
private CustormerDao custormerdao = new CustormerDaoImpl();
@Override
public void addcustormer(CustormerBean custormer) {
// TODO Auto-generated method stub
custormerdao.addcustormer(custormer);
}
@Override
public void deletecustormer(int custormer_id) {
// TODO Auto-generated method stub
custormerdao.deletecustormer(custormer_id);
}
@Override
public CustormerBean getcustormer(String custormer_name) {
// TODO Auto-generated method stub
return custormerdao.getcustormer(custormer_name);
}
@Override
public void updatecustormer(CustormerBean custormer) {
// TODO Auto-generated method stub
custormerdao.updatecustormer(custormer);
}
@Override
public List getall() {
// TODO Auto-generated method stub
return custormerdao.getall();
}
}
业务层调用持久层：
cn.pro.dao.CustormerDao
package cn.pro.dao;
import java.util.List;
import cn.pro.domain.CustormerBean;
//客户的持久层接口
public interface CustormerDao {
List getall();
void addcustormer(CustormerBean custormer);
void deletecustormer(int custormer_id);
CustormerBean getcustormer(String custormer_name);
void updatecustormer(CustormerBean custormer);
}
cn.pro.dao.CustormerDaoImpl
package cn.pro.dao;
import java.sql.SQLException;
import java.util.List;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import cn.pro.domain.CustormerBean;
import cn.pro.utils.C3p0Util;
//客户的持久层实现类
public class CustormerDaoImpl implements CustormerDao {
ComboPooledDataSource ds = C3p0Util.getds();
private QueryRunner runner=new QueryRunner(ds);
@Override
public List getall() {
// TODO Auto-generated method stub
try {
return runner.query("select * from custormer", new BeanListHandler(CustormerBean.class));
} catch (SQLException e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}
}
@Override
public void addcustormer(CustormerBean custormer) {
// TODO Auto-generated method stub
try {
runner.update("insert into custormer values('custormer_id'=?,'custormer_name'=?,'custormer_add'=?,'custormer_tel'=?,'custormer_sex'=?,'custormer_birth'=?)",
custormer.getCustormer_id(),
custormer.getCustormer_name(),
custormer.getCustormer_add(),
custormer.getCustormer_tel(),
custormer.getCustormer_sex(),
custormer.getCustormer_birth());
} catch (SQLException e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}
}
@Override
public void deletecustormer(int custormer_id) {
// TODO Auto-generated method stub
try {
runner.update("delete custormer where custormer_id=?",custormer_id);
} catch (SQLException e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}
}
@Override
public CustormerBean getcustormer(String custormer_name) {
try {
return runner.query("select * from custormer where custormer_name=?", new BeanHandler(CustormerBean.class),custormer_name);
} catch (SQLException e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}
}
@Override
public void updatecustormer(CustormerBean custormer) {
// TODO Auto-generated method stub
try {
runner.update("update custormer set custormer_name=?,custormer_add=?,custormer_tel=?,custormer_sex=?,custormer_birth=? whrer custormer_id=?",
custormer.getCustormer_name(),
custormer.getCustormer_add(),
custormer.getCustormer_tel(),
custormer.getCustormer_sex(),
custormer.getCustormer_birth(),
custormer.getCustormer_id());
} catch (SQLException e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}
}
}
C3p0 xml配置文件
/src/c3p0-config.xml
com.mysql.jdbc.Driver
jdbc:mysql://localhost:3306/springtest
root
123456
10
30
100
10
C3p0 properties配置文件。
/springtest226/src/c3p0.properties
driverClass=com.mysql.jdbc.Driver
jdbcUrl=jdbc:mysql://localhost:3306/springtest
user=root
password=123456获取连接池的工具类
cn.pro.utils.C3p0Util
package cn.pro.utils;
import java.beans.PropertyVetoException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ResourceBundle;
import org.omg.CORBA.PUBLIC_MEMBER;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.Statement;
public class C3p0Util {
static ComboPooledDataSource ds =new ComboPooledDataSource();//自动加载配置文件类容
//获取properties文件中配置
/* static{
ResourceBundle rb = ResourceBundle.getBundle("c3p0");
try {
ds.setDriverClass(rb.getString("driverClass"));
ds.setJdbcUrl(rb.getString("jdbcUrl"));
ds.setUser(rb.getString("user"));
ds.setPassword(rb.getString("password"));
} catch (PropertyVetoException e) {
// TODO Auto-generated catch block
throw new ExceptionInInitializerError("初始化失败"+e);
}
}*/
public static ComboPooledDataSource getds() {
return ds;
}
public static Connection getConection(){
try {
return (Connection) ds.getConnection();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException();
}
}
public static void close(ResultSet rs,Statement state,Connection conn){
if(rs != null){
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(state != null){
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(conn != null){
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
使用junit测试
package cn.pro.junit;
import static org.junit.Assert.*;
import java.util.List;
import java.util.ResourceBundle;
import org.junit.Test;
import cn.pro.domain.CustormerBean;
import cn.pro.service.ICustormerService;
import cn.pro.service.impl.ICustormerServiceImpl;
public class ICustormerServiceImplTest {
@Test
public void test() {
ICustormerService custormer = new ICustormerServiceImpl();
List list = custormer.getall();
System.out.println(list);
}
@Test
public void test2(){
ResourceBundle rb = ResourceBundle.getBundle("c3p0");
System.out.println(rb.getString("driverClass"));
}
}
把数据库中类容排列成数组打印出来。
整合spring部分代码更改：
自己写的类代码块的依赖
1.明确依赖关系。
2.使用set方法注入依赖
注意不能忽略调用包类的依赖（这部分需要看包的源代码）
1.有构造函数
例如：
2.有set方法：
例如：
ICustormerServiceImpl依赖CustormerDao接口来调用持久层，生成set方法；
cn.pro.service.impl.ICustormerServiceImpl
package cn.pro.service.impl;
import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import cn.pro.dao.CustormerDao;
import cn.pro.dao.CustormerDaoImpl;
import cn.pro.domain.CustormerBean;
import cn.pro.service.ICustormerService;
public class ICustormerServiceImpl implements ICustormerService {
//ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
private CustormerDao custormerdao;
public void setCustormerdao(CustormerDao custormerdao) {
this.custormerdao = custormerdao;
}
//private CustormerDao custormerdao = new CustormerDaoImpl();
@Override
public void addcustormer(CustormerBean custormer) {
// TODO Auto-generated method stub
custormerdao.addcustormer(custormer);
}
@Override
public void deletecustormer(int custormer_id) {
// TODO Auto-generated method stub
custormerdao.deletecustormer(custormer_id);
}
@Override
public CustormerBean getcustormer(String custormer_name) {
// TODO Auto-generated method stub
return custormerdao.getcustormer(custormer_name);
}
@Override
public void updatecustormer(CustormerBean custormer) {
// TODO Auto-generated method stub
custormerdao.updatecustormer(custormer);
}
@Override
public List getall() {
// TODO Auto-generated method stub
return custormerdao.getall();
}
}
CustormerDaoImpl 依赖runner生成set方法：
cn.pro.dao.CustormerDaoImpl
package cn.pro.dao;
import java.sql.SQLException;
import java.util.List;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import cn.pro.domain.CustormerBean;
import cn.pro.utils.C3p0Util;
//客户的持久层实现类
public class CustormerDaoImpl implements CustormerDao {
private QueryRunner runner;
public void setRunner(QueryRunner runner) {
this.runner = runner;
}
//ComboPooledDataSource ds = C3p0Util.getds();
//private QueryRunner runner=new QueryRunner(ds);
@Override
public List getall() {
// TODO Auto-generated method stub
try {
return runner.query("select * from custormer", new BeanListHandler(CustormerBean.class));
} catch (SQLException e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}
}
@Override
public void addcustormer(CustormerBean custormer) {
// TODO Auto-generated method stub
try {
runner.update("insert into custormer values('custormer_id'=?,'custormer_name'=?,'custormer_add'=?,'custormer_tel'=?,'custormer_sex'=?,'custormer_birth'=?)",
custormer.getCustormer_id(),
custormer.getCustormer_name(),
custormer.getCustormer_add(),
custormer.getCustormer_tel(),
custormer.getCustormer_sex(),
custormer.getCustormer_birth());
} catch (SQLException e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}
}
@Override
public void deletecustormer(int custormer_id) {
// TODO Auto-generated method stub
try {
runner.update("delete custormer where custormer_id=?",custormer_id);
} catch (SQLException e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}
}
@Override
public CustormerBean getcustormer(String custormer_name) {
try {
return runner.query("select * from custormer where custormer_name=?", new BeanHandler(CustormerBean.class),custormer_name);
} catch (SQLException e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}
}
@Override
public void updatecustormer(CustormerBean custormer) {
// TODO Auto-generated method stub
try {
runner.update("update custormer set custormer_name=?,custormer_add=?,custormer_tel=?,custormer_sex=?,custormer_birth=? whrer custormer_id=?",
custormer.getCustormer_name(),
custormer.getCustormer_add(),
custormer.getCustormer_tel(),
custormer.getCustormer_sex(),
custormer.getCustormer_birth(),
custormer.getCustormer_id());
} catch (SQLException e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}
}
}
依赖关系：cn.pro.service.impl.ICustormerServiceImpl ------>cn.pro.dao.CustormerDaoImpl------->org.apache.commons.dbutils.QueryRunner------>com.mchange.v2.c3p0.ComboPooledDataSource
bean.xml
junit测试
@Test
public void test3(){
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
ICustormerService custormer = (ICustormerService) ac.getBean("custormerservice");
List
System.out.println(list);
这样就解决了程序的耦合。