Java代码  

1. protected static Connection doGetConnection(DataSource dataSource, boolean allowSynchronization);   
2.             throws SQLException {   
3.            
4.         ConnectionHolder conHolder = (ConnectionHolder); TransactionSynchronizationManager.getResource(dataSource);;   
5.         if (conHolder != null); {   
6.             conHolder.requested();;   
7.             return conHolder.getConnection();;   
8.         }   
9.   
10.            
11.         Connection con = dataSource.getConnection();;   
12.         if (allowSynchronization && TransactionSynchronizationManager.isSynchronizationActive();); {   
13.                         conHolder = new ConnectionHolder(con);;   
14.             TransactionSynchronizationManager.bindResource(dataSource, conHolder);;   
15.             TransactionSynchronizationManager.registerSynchronization(new ConnectionSynchronization(conHolder, dataSource););;   
16.             conHolder.requested();;   
17.         }   
18.   
19.         return con;   
20.     }  

protected static Connection doGetConnection(DataSource dataSource, boolean allowSynchronization);
			throws SQLException {
		
		ConnectionHolder conHolder = (ConnectionHolder); TransactionSynchronizationManager.getResource(dataSource);;
		if (conHolder != null); {
			conHolder.requested();;
			return conHolder.getConnection();;
		}

		
		Connection con = dataSource.getConnection();;
		if (allowSynchronization && TransactionSynchronizationManager.isSynchronizationActive();); {
						conHolder = new ConnectionHolder(con);;
			TransactionSynchronizationManager.bindResource(dataSource, conHolder);;
			TransactionSynchronizationManager.registerSynchronization(new ConnectionSynchronization(conHolder, dataSource););;
			conHolder.requested();;
		}

		return con;
	}

Java代码  

1. private static ThreadLocal resources = new ThreadLocal();;   
2. public static Object getResource(Object key); {   
3.         Map map = (Map); resources.get();;   
4.         if (map == null); {   
5.             return null;   
6.         }   
7.         Object value = map.get(key);;   
8.                 return value;   
9.     }   
10. public static void bindResource(Object key, Object value); throws IllegalStateException {   
11.         Map map = (Map); resources.get();;   
12.                 if (map == null); {   
13.             map = new HashMap();;   
14.             resources.set(map);;   
15.         }   
16.         map.put(key, value);;   
17.             }  

private static ThreadLocal resources = new ThreadLocal();;
public static Object getResource(Object key); {
		Map map = (Map); resources.get();;
		if (map == null); {
			return null;
		}
		Object value = map.get(key);;
				return value;
	}
public static void bindResource(Object key, Object value); throws IllegalStateException {
		Map map = (Map); resources.get();;
				if (map == null); {
			map = new HashMap();;
			resources.set(map);;
		}
		map.put(key, value);;
			}

Java代码  

1. public void requested(); {   
2.         this.referenceCount++;   
3.     }   
4.   
5.     public void released(); {   
6.         this.referenceCount--;   
7.     }  

public void requested(); {
		this.referenceCount++;
	}

	public void released(); {
		this.referenceCount--;
	}

Java代码  

1. if (conHolder != null); {   
2.             conHolder.requested();;   
3.             return conHolder.getConnection();;   
4.         }  

if (conHolder != null); {
			conHolder.requested();;
			return conHolder.getConnection();;
		}

Java代码  

1. protected void doCleanupAfterCompletion(Object transaction); {   
2.         DataSourceTransactionObject txObject = (DataSourceTransactionObject); transaction;   
3.   
4.         // Remove the connection holder from the thread.   
5.         TransactionSynchronizationManager.unbindResource(this.dataSource);;   
6.         txObject.getConnectionHolder();.clear();;   
7.   
8.         //...       DataSourceUtils.closeConnectionIfNecessary(con, this.dataSource);;   
9.     }  

protected void doCleanupAfterCompletion(Object transaction); {
		DataSourceTransactionObject txObject = (DataSourceTransactionObject); transaction;

		// Remove the connection holder from the thread.
		TransactionSynchronizationManager.unbindResource(this.dataSource);;
		txObject.getConnectionHolder();.clear();;

		//...		DataSourceUtils.closeConnectionIfNecessary(con, this.dataSource);;
	}

Java代码  

1. protected static void doCloseConnectionIfNecessary(Connection con, DataSource dataSource); throws SQLException {   
2.         if (con == null); {   
3.             return;   
4.         }   
5.   
6.         ConnectionHolder conHolder = (ConnectionHolder); TransactionSynchronizationManager.getResource(dataSource);;   
7.         if (conHolder != null && con == conHolder.getConnection();); {   
8.             // It's the transactional Connection: Don't close it.   
9.             conHolder.released();;   
10.             return;   
11.         }   
12.            
13.         // Leave the Connection open only if the DataSource is our   
14.         // special data source, and it wants the Connection left open.   
15.         if (!(dataSource instanceof SmartDataSource); || ((SmartDataSource); dataSource);.shouldClose(con);); {   
16.             logger.debug("Closing JDBC connection");;   
17.             con.close();;   
18.         }   
19.     }  

protected static void doCloseConnectionIfNecessary(Connection con, DataSource dataSource); throws SQLException {
		if (con == null); {
			return;
		}

		ConnectionHolder conHolder = (ConnectionHolder); TransactionSynchronizationManager.getResource(dataSource);;
		if (conHolder != null && con == conHolder.getConnection();); {
			// It's the transactional Connection: Don't close it.
			conHolder.released();;
			return;
		}
		
		// Leave the Connection open only if the DataSource is our
		// special data source, and it wants the Connection left open.
		if (!(dataSource instanceof SmartDataSource); || ((SmartDataSource); dataSource);.shouldClose(con);); {
			logger.debug("Closing JDBC connection");;
			con.close();;
		}
	}

Java代码  

1. public Object execute(PreparedStatementCreator psc, PreparedStatementCallback action);   
2.             throws DataAccessException {   
3.   
4.         Connection con = DataSourceUtils.getConnection(getDataSource(););;   
5.         //其他代码   
6.     DataSourceUtils.closeConnectionIfNecessary(con, getDataSource(););;   
7.         }   
8.     }  

public Object execute(PreparedStatementCreator psc, PreparedStatementCallback action);
			throws DataAccessException {

		Connection con = DataSourceUtils.getConnection(getDataSource(););;
		//其他代码
	DataSourceUtils.closeConnectionIfNecessary(con, getDataSource(););;
		}
	}

Java代码  

1. public Connection getConnection(); throws SQLException {   
2.         Connection con = DataSourceUtils.doGetConnection(getTargetDataSource();, true);;   
3.         return getTransactionAwareConnectionProxy(con, getTargetDataSource(););;   
4.     }  

public Connection getConnection(); throws SQLException {
		Connection con = DataSourceUtils.doGetConnection(getTargetDataSource();, true);;
		return getTransactionAwareConnectionProxy(con, getTargetDataSource(););;
	}

Java代码  

1. protected Connection getTransactionAwareConnectionProxy(Connection target, DataSource dataSource); {   
2.         return (Connection); Proxy.newProxyInstance(   
3.                 ConnectionProxy.class.getClassLoader();,   
4.                 new Class[] {ConnectionProxy.class},   
5.                 new TransactionAwareInvocationHandler(target, dataSource););;   
6.     }  

protected Connection getTransactionAwareConnectionProxy(Connection target, DataSource dataSource); {
		return (Connection); Proxy.newProxyInstance(
				ConnectionProxy.class.getClassLoader();,
				new Class[] {ConnectionProxy.class},
				new TransactionAwareInvocationHandler(target, dataSource););;
	}

Java代码  

1. public Object invoke(Object proxy, Method method, Object[] args); throws Throwable {   
2.         //...           if (method.getName();.equals(CONNECTION_CLOSE_METHOD_NAME);); {   
3.                 if (this.dataSource != null); {   
4.                     DataSourceUtils.doCloseConnectionIfNecessary(this.target, this.dataSource);;   
5.                 }   
6.                 return null;   
7.             }   
8.   
9.                     }  

public Object invoke(Object proxy, Method method, Object[] args); throws Throwable {
		//...			if (method.getName();.equals(CONNECTION_CLOSE_METHOD_NAME);); {
				if (this.dataSource != null); {
					DataSourceUtils.doCloseConnectionIfNecessary(this.target, this.dataSource);;
				}
				return null;
			}

					}

1. <!-- JDBC驱动程序 -->  
2. <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost:3306/struts?useUnicode=true&characterEncoding=GBK</property> <!-- 数据库用户名 -->  
3. <property name="connection.username">root</property> <!-- 数据库密码 -->  
4. <property name="connection.password">8888</property>   

<!-- JDBC驱动程序 --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost:3306/struts?useUnicode=true&characterEncoding=GBK</property> <!-- 数据库用户名 --> <property name="connection.username">root</property> <!-- 数据库密码 --> <property name="connection.password">8888</property> 

<property name="c3p0.min_size">5</property> <property name="c3p0.max_size">30</property> <property name="c3p0.time_out">1800</property> <property name="c3p0.max_statement">50</property> 

<property name="dbcp.maxActive">100</property> <property name="dbcp.whenExhaustedAction">1</property> <property name="dbcp.maxWait">60000</property> <property name="dbcp.maxIdle">10</property> <property name="dbcp.ps.maxActive">100</property> <property name="dbcp.ps.whenExhaustedAction">1</property> <property name="dbcp.ps.maxWait">60000</property> <property name="dbcp.ps.maxIdle">10</property>

<property name="hibernate.proxool.pool_alias">dbpool</property> <property name="hibernate.proxool.xml">proxool.xml</property> <property name="connection.provider_class">org.hibernate.connection.ProxoolConnectionProvider</property>

<?xml version="1.0" encoding="utf-8"?> <!-- the proxool configuration can be embedded within your own application's. Anything outside the "proxool" tag is ignored. --> <something-else-entirely> <proxool> <alias>dbpool</alias> <!--proxool只能管理由自己产生的连接--> <driver-url> jdbc:mysql://127.0.0.1:3306/wlsh?characterEncoding=GBK&useUnicode=true&autoReconnect=true </driver-url> <driver-class>com.mysql.jdbc.Driver</driver-class> <driver-properties> <property name="user" value="root" /> <property name="password" value="123456" /> </driver-properties> <!-- proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回收,超时的销毁--> <house-keeping-sleep-time>90000</house-keeping-sleep-time> <!-- 最少保持的空闲连接数--> <prototype-count>5</prototype-count> <!-- 允许最大连接数,超过了这个连接，再有请求时，就排在队列中等候，最大的等待请求数由maximum-new-connections决定--> <maximum-connection-count>100</maximum-connection-count> <!-- 最小连接数--> <minimum-connection-count>10</minimum-connection-count> </proxool></something-else-entirely>

方法二：通过Spring提供的工具类获取ApplicationContext对象
代码：
import org.springframework.web.context.support.WebApplicationContextUtils;
ApplicationContext ac1 = WebApplicationContextUtils.getRequiredWebApplicationContext(ServletContext sc);
ApplicationContext ac2 = WebApplicationContextUtils.getWebApplicationContext(ServletContext sc);
ac1.getBean("beanId");
ac2.getBean("beanId");
说明：
这种方式适合于采用Spring框架的B/S系统，通过ServletContext对象获取ApplicationContext对象，然后在通过它获取需要的类实例。

上面两个工具方式的区别是，前者在获取失败时抛出异常，后者返回null。

其中 servletContext sc 可以具体 换成 servlet.getServletContext()或者 this.getServletContext() 或者 request.getSession().getServletContext(); 另外，由于spring是注入的对象放在ServletContext中的，所以可以直接在ServletContext取出 WebApplicationContext 对象： WebApplicationContext webApplicationContext = (WebApplicationContext) servletContext.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);

方法三：继承自抽象类ApplicationObjectSupport
说明：抽象类ApplicationObjectSupport提供getApplicationContext()方法，可以方便的获取到ApplicationContext。
Spring初始化时，会通过该抽象类的setApplicationContext(ApplicationContext context)方法将ApplicationContext 对象注入。

方法四：继承自抽象类WebApplicationObjectSupport
说明：类似上面方法，调用getWebApplicationContext()获取WebApplicationContext

总的来看 Java EE 5 的标注开发方式开来是得到了大家的认可了.

@Service 相当于定义 bean, 自动根据 bean 的类名生成一个首字母小写的 bean

@Autowired 则是自动注入依赖的类, 它会在类路径中找成员对应的类/接口的实现类, 如果找到多个, 需要用 @Qualifier("chineseMan") 来指定对应的 bean 的 ID.

一定程度上大大简化了代码的编写, 例如一对一的 bean 映射现在完全不需要写任何额外的 bean 定义了.

下面是代码的运行结果:

man.sayHello()=抽你丫的
SimpleMan said: Hi
org.example.EnglishMan@12bcd4b said: Fuck you!

代码:

beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<context:annotation-config/>
<context:component-scan base-package="org.example"/>
</beans>

测试类:

import org.example.IMan;
import org.example.SimpleMan;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringTest {
    public static void main(String[] args) {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
        SimpleMan dao = (SimpleMan) ctx.getBean("simpleMan");
        System.out.println(dao.hello());
        IMan man = (IMan) ctx.getBean("usMan");
        System.out.println(man.sayHello());
    }
}

自动探测和注入bean的类:

package org.example;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

@Service
public class SimpleMan {
    // 自动注入名称为 Man 的 Bean
    @Autowired(required = false)
    @Qualifier("chineseMan")
    //@Qualifier("usMan")
    private IMan man;   

    /**
     * @return the man
     */
    public IMan getMan() {
        return man;
    }

    /**
     * @param man the man to set
     */
    public void setMan(IMan man) {
        this.man = man;
    }

    public String hello() {
        System.out.println("man.sayHello()=" + man.sayHello());
        return "SimpleMan said: Hi";
    }
}

一个接口和两个实现类:

package org.example;

/**
* 抽象的人接口.
* @author BeanSoft
* @version 1.0
*/
public interface IMan {
    /**
     * 打招呼的抽象定义.
     * @return 招呼的内容字符串
     */
    public String sayHello();
}

package org.example;

import org.springframework.stereotype.Service;

/**
* 中国人的实现.
* @author BeanSoft
*/
@Service
public class ChineseMan implements IMan {

    public String sayHello() {
        return "抽你丫的";
    }

}

package org.example;

import org.springframework.stereotype.Service;

/**
* @author BeanSoft
* 美国大兵
*/
@Service("usMan")
// 这里定义了一个 id 为 usMan 的 Bean, 标注里面的属性是 bean 的 id
public class EnglishMan implements IMan {

    public String sayHello() {
        return this + " said: Fuck you!";
    }

}

Java代码

1. jdbcTemplate.execute("CREATE TABLE USER (user_id integer, name varchar(100))");  

jdbcTemplate.execute("CREATE TABLE USER (user_id integer, name varchar(100))");

Java代码

1. jdbcTemplate.update("INSERT INTO USER VALUES('"  
2.            + user.getId() + "', '"  
3.            + user.getName() + "', '"  
4.            + user.getSex() + "', '"  
5.            + user.getAge() + "')");  

jdbcTemplate.update("INSERT INTO USER VALUES('"
+ user.getId() + "', '"
+ user.getName() + "', '"
+ user.getSex() + "', '"
+ user.getAge() + "')");

Java代码

1. jdbcTemplate.update("UPDATE USER SET name = ? WHERE user_id = ?", new Object[] {name, id});  

jdbcTemplate.update("UPDATE USER SET name = ? WHERE user_id = ?", new Object[] {name, id});

Java代码

1. jdbcTemplate.update("INSERT INTO USER VALUES(?, ?, ?, ?)", new Object[] {user.getId(), user.getName(), user.getSex(), user.getAge()});  

jdbcTemplate.update("INSERT INTO USER VALUES(?, ?, ?, ?)", new Object[] {user.getId(), user.getName(), user.getSex(), user.getAge()});

Java代码

1. int count = jdbcTemplate.queryForInt("SELECT COUNT(*) FROM USER");  

int count = jdbcTemplate.queryForInt("SELECT COUNT(*) FROM USER");

Java代码

1. String name = (String) jdbcTemplate.queryForObject("SELECT name FROM USER WHERE user_id = ?", new Object[] {id}, java.lang.String.class);  

String name = (String) jdbcTemplate.queryForObject("SELECT name FROM USER WHERE user_id = ?", new Object[] {id}, java.lang.String.class);

Java代码

1. List rows = jdbcTemplate.queryForList("SELECT * FROM USER");  

List rows = jdbcTemplate.queryForList("SELECT * FROM USER");

Java代码

1. List rows = jdbcTemplate.queryForList("SELECT * FROM USER");   
2. Iterator it = rows.iterator();   
3. while(it.hasNext()) {   
4.     Map userMap = (Map) it.next();   
5.     System.out.print(userMap.get("user_id") + "\t");   
6.     System.out.print(userMap.get("name") + "\t");   
7.     System.out.print(userMap.get("sex") + "\t");   
8.     System.out.println(userMap.get("age") + "\t");   
9. }  

List rows = jdbcTemplate.queryForList("SELECT * FROM USER");
Iterator it = rows.iterator();
while(it.hasNext()) {
Map userMap = (Map) it.next();
System.out.print(userMap.get("user_id") + "\t");
System.out.print(userMap.get("name") + "\t");
System.out.print(userMap.get("sex") + "\t");
System.out.println(userMap.get("age") + "\t");
}

Java代码

1. final String id = user.getId();   
2. final String name = user.getName();   
3. final String sex = user.getSex() + "";   
4. final int age = user.getAge();   
5.   
6. jdbcTemplate.update("INSERT INTO USER VALUES(?, ?, ?, ?)",   
7.                      new PreparedStatementSetter() {   
8.                          public void setValues(PreparedStatement ps) throws SQLException {   
9.                              ps.setString(1, id);   
10.                              ps.setString(2, name);             
11.                              ps.setString(3, sex);   
12.                              ps.setInt(4, age);   
13.                          }   
14.                      });  

final String id = user.getId();
final String name = user.getName();
final String sex = user.getSex() + "";
final int age = user.getAge();
jdbcTemplate.update("INSERT INTO USER VALUES(?, ?, ?, ?)",
new PreparedStatementSetter() {
public void setValues(PreparedStatement ps) throws SQLException {
ps.setString(1, id);
ps.setString(2, name);
ps.setString(3, sex);
ps.setInt(4, age);
}
});

Java代码

1. final User user = new User();   
2. jdbcTemplate.query("SELECT * FROM USER WHERE user_id = ?",   
3.                     new Object[] {id},   
4.                     new RowCallbackHandler() {   
5.                         public void processRow(ResultSet rs) throws SQLException {   
6.                             user.setId(rs.getString("user_id"));   
7.                             user.setName(rs.getString("name"));   
8.                             user.setSex(rs.getString("sex").charAt(0));   
9.                             user.setAge(rs.getInt("age"));   
10.                         }   
11.                     });  

final User user = new User();
jdbcTemplate.query("SELECT * FROM USER WHERE user_id = ?",
new Object[] {id},
new RowCallbackHandler() {
public void processRow(ResultSet rs) throws SQLException {
user.setId(rs.getString("user_id"));
user.setName(rs.getString("name"));
user.setSex(rs.getString("sex").charAt(0));
user.setAge(rs.getInt("age"));
}
});

Java代码

1. class UserRowMapper implements RowMapper {   
2.     public Object mapRow(ResultSet rs, int index) throws SQLException {   
3.         User user = new User();   
4.   
5.         user.setId(rs.getString("user_id"));   
6.         user.setName(rs.getString("name"));   
7.         user.setSex(rs.getString("sex").charAt(0));   
8.         user.setAge(rs.getInt("age"));   
9.   
10.         return user;   
11.     }   
12. }   
13.   
14. public List findAllByRowMapperResultReader() {   
15.     String sql = "SELECT * FROM USER";   
16.     return jdbcTemplate.query(sql, new RowMapperResultReader(new UserRowMapper()));   
17. }  

class UserRowMapper implements RowMapper {
public Object mapRow(ResultSet rs, int index) throws SQLException {
User user = new User();
user.setId(rs.getString("user_id"));
user.setName(rs.getString("name"));
user.setSex(rs.getString("sex").charAt(0));
user.setAge(rs.getInt("age"));
return user;
}
}
public List findAllByRowMapperResultReader() {
String sql = "SELECT * FROM USER";
return jdbcTemplate.query(sql, new RowMapperResultReader(new UserRowMapper()));
}

Java代码

1. public User getUser(final String id) throws DataAccessException {   
2.     String sql = "SELECT * FROM USER WHERE user_id=?";   
3.     final Object[] params = new Object[] { id };   
4.     List list = jdbcTemplate.query(sql, params, new RowMapperResultReader(new UserRowMapper()));   
5.   
6.     return (User) list.get(0);   
7. }  

public User getUser(final String id) throws DataAccessException {
String sql = "SELECT * FROM USER WHERE user_id=?";
final Object[] params = new Object[] { id };
List list = jdbcTemplate.query(sql, params, new RowMapperResultReader(new UserRowMapper()));
return (User) list.get(0);
}

Java代码

1. public PreparedStatement createPreparedStatement(Connection con) throws SQLException {   
2.  return con.prepareStatement(sql);   
3. }  

 public PreparedStatement createPreparedStatement(Connection con) throws SQLException {
return con.prepareStatement(sql);
}

Java代码

1. template.update("insert into web_person values(?,?,?)",Object[]);  

 template.update("insert into web_person values(?,?,?)",Object[]);

Java代码

1. template.update("insert into web_person values(?,?,?)",new PreparedStatementSetter(){ 匿名内部类 只能访问外部最终局部变量   
2.   
3.  public void setValues(PreparedStatement ps) throws SQLException {   
4.   ps.setInt(index++,3);   
5. });  

 template.update("insert into web_person values(?,?,?)",new PreparedStatementSetter(){ 匿名内部类 只能访问外部最终局部变量
public void setValues(PreparedStatement ps) throws SQLException {
ps.setInt(index++,3);
});

Java代码

1. public void setValues(PreparedStatement ps) throws SQLException {   
2.  ps.setInt(index++,3);   
3. }  

 public void setValues(PreparedStatement ps) throws SQLException {
ps.setInt(index++,3);
}

Java代码

1. public Object mapRow(ResultSet rs, int arg1) throws SQLException {   int表当前行数   
2.   person.setId(rs.getInt("id"));   
3. }   
4. List template.query("select * from web_person where id=?",Object[],RowMapper);  

 public Object mapRow(ResultSet rs, int arg1) throws SQLException {   int表当前行数
person.setId(rs.getInt("id"));
}
List template.query("select * from web_person where id=?",Object[],RowMapper);

Java代码

1. template.query("select * from web_person where id=?",Object[],new RowCallbackHandler(){   
2.  public void processRow(ResultSet rs) throws SQLException {   
3.   person.setId(rs.getInt("id"));   
4. });  

(一)新建一个java bean(HelloBean.java)

java 代码

1. package chb.demo.vo;   
2.   
3. public class HelloBean {   
4.  private String helloWorld;   
5.   
6.  public String getHelloWorld() {   
7.   return helloWorld;   
8.  }   
9.   
10.  public void setHelloWorld(String helloWorld) {   
11.   this.helloWorld = helloWorld;   
12.  }   
13. }   
14.   

(二)构造一个配置文件(beanConfig.xml)

xml 代码

1. xml version="1.0" encoding="UTF-8"?>  
2. >  
3. <beans>  
4.  <bean id="helloBean" class="chb.demo.vo.HelloBean">  
5.   <property name="helloWorld">  
6.    <value>Hello!chb!value>  
7.   property>  
8.  bean>  
9. beans>  

(三)读取xml文件

1.利用ClassPathXmlApplicationContext

java 代码

1. ApplicationContext context = new ClassPathXmlApplicationContext("beanConfig.xml");   
2. HelloBean helloBean = (HelloBean)context.getBean("helloBean");   
3. System.out.println(helloBean.getHelloWorld());  

2.利用FileSystemResource读取

java 代码

1. Resource rs = new FileSystemResource("D:/software/tomcat/webapps/springWebDemo/WEB-INF/classes/beanConfig.xml");   
2.   BeanFactory factory = new XmlBeanFactory(rs);   
3.   HelloBean helloBean = (HelloBean)factory.getBean("helloBean");\   
4.   System.out.println(helloBean.getHelloWorld());   

 值得注意的是：利用FileSystemResource，则配置文件必须放在project直接目录下，或者写明绝对路径，否则就会抛出找不到文件的异常

这里介绍两种技术：利用spring读取properties 文件和利用java.util.Properties读取

(一)利用spring读取properties 文件

我们还利用上面的HelloBean.java文件，构造如下beanConfig.properties文件:

properties 代码

1. helloBean.class=chb.demo.vo.HelloBean   
2. helloBean.helloWorld=Hello!chb!  

属性文件中的"helloBean"名称即是Bean的别名设定，.class用于指定类来源。

然后利用org.springframework.beans.factory.support.PropertiesBeanDefinitionReader来读取属性文件

java 代码

1. BeanDefinitionRegistry reg = new DefaultListableBeanFactory();   
2.  PropertiesBeanDefinitionReader reader = new PropertiesBeanDefinitionReader(reg);   
3.  reader.loadBeanDefinitions(new ClassPathResource("beanConfig.properties"));   
4.  BeanFactory factory = (BeanFactory)reg;   
5.  HelloBean helloBean = (HelloBean)factory.getBean("helloBean");   
6.  System.out.println(helloBean.getHelloWorld());   

 

(二)利用java.util.Properties读取属性文件

比如，我们构造一个ipConfig.properties来保存服务器ip地址和端口，如：

properties 代码

1. ip=192.168.0.1   
2. port=8080  

则，我们可以用如下程序来获得服务器配置信息：

java 代码

1. InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("ipConfig.properties");   
2.   Properties p = new Properties();   
3.   try {   
4.    p.load(inputStream);   
5.   } catch (IOException e1) {   
6.    e1.printStackTrace();   
7.   }   
8. System.out.println("ip:"+p.getProperty("ip")+",port:"+p.getProperty("port"));