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spring 依赖注入到直接new 对象

Sat, 27 Oct 2007 08:31:00 GMT

当�ؓ遗留�pȝ��加入spring�Ӟ��l�典问题��是遗留�pȝ��需要引用spring��理的bean。幸好spring有机制可以处理这些�?br />
��Z��个类实现ApplicationContextAware接口�Q�有一个引用ApplicationContext的静态成员，然后�Q�遗留系�l�需要引用spring��理的bean的地方，使用�q�个�c�R�?br />
1.比如�Q�我�q�里��Z��个SpringContext�c?br />

package net.blogjava.chenlb;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

/**
* 此类可以取得Spring的上下文.
* Spring 使new�Ҏ(gu��)��创徏的对象可以引用spring��理的bean.
* 2007-10-18 上午11:12:33
* @author chenlb
*/
public class SpringContext implements ApplicationContextAware {

    protected static ApplicationContext context;

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        context = applicationContext;
    }

    public static ApplicationContext getContext() {
        return context;
    }

}

2.然后在spring配置文�g里加

3.其它�c�M��引用

MyBean myBean = (MyBean) SpringContext.getContext().getBean("myBean");

4.如果老是写SpringContext.getContext().getBean("...");�ȝ��Q�可以徏一个工厂类来返回你要的bean

package net.blogjava.chenlb;

public class MyServerFactory {

    public static MyBean1 getMyBean1() {
        return (MyBean1) SpringContext.getContext().getBean("myBean1");
    }


}

^_^

��浪�?/a> 2007-10-27 16:31 发表评论

Mon, 20 Aug 2007 03:39:00 GMT

数据源：

     <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
         <property name="driverClassName" value="com.mysql.jdbc.Driver">property>
         <property name="url" value="jdbc:mysql://localhost:3306/study">property>
         <property name="username" value="root">property>
         <property name="password" value="">property>
     bean>

事务��理者：

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource">property>
    bean>

被管理的对象�Q?br>

事务性代理对象：

    <bean id="myBusinessObject" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
        <property name="transactionManager" ref="transactionManager">property>
        <property name="target" ref="myBusinessObjectTarget">property>
        <property name="transactionAttributes">
            <props>
                <prop key="myBusinessMethod">
                    PROPAGATION_REQUIRED,-MyCheckedException
                prop>
            props>
        property>
    bean>

说明�Q?MyCheckedException表示抛出此导常时回滚�Q?MyCheckedException表示抛出此导常时提交�?br>
MyBusinessObject�Q?br>

package mybusiness;

/**
*
* 2007-8-20 上午11:26:28
* @author chenlb
*/
public class MyBusinessObject {

    public void myBusinessMethod() throws MyCheckedException {
        // do some resource access
        // return some result object or throw MycheckedException
    }
}

声明式事务的其中一�U��Ş式。^_^

��浪�?/a> 2007-08-20 11:39 发表评论

Mon, 20 Aug 2007 03:22:00 GMT

spring �?JdbcTemplate……的事务管理不用担心。就是对直接Jdbc实现的Dao事务��理有点��问题，如：我直接，用dataSource.getConnection()。spring是管理不了事务的。原因是Jdbc实现的Dao里的connection是自动提交的。要改用�l�过spring 处理�q�的connection = DataSourceUtil.getConnection(dataSource);才行�?br> 我这有个例子——用��h��册，有备份。只是例子而且�?br> 下面是原始的Dao实现�Q?br>备䆾�Ҏ(gu��)��Q?/p>

    public User backUp(User user) throws SQLException {
        Connection conn = dataSource.getConnection();
        try {
            PreparedStatement pstmt = conn.prepareStatement("insert into user(name) values (?)");
            pstmt.setString(1, user.getName()+" 备䆾");
            pstmt.executeUpdate();

            pstmt = conn.prepareStatement("select last_insert_id()");
            ResultSet rs = pstmt.executeQuery();
            if(rs != null && rs.next()) {
                user.setUId(rs.getInt(1));
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            throw e;
        } finally {
            if(conn != null) {
                try {
                    conn.close();
                } catch (SQLException e) {
                                System.out.println("数据库连接关闭失�?");
                }
            }
        }
        return user;
    }

现在要改成：

    public User backUp(User user) throws SQLException {
        Connection conn = DataSourceUtils.getConnection(dataSource);
        try {
            PreparedStatement pstmt = conn.prepareStatement("insert into user(name) values (?)");
            pstmt.setString(1, user.getName()+" 备䆾");
            pstmt.executeUpdate();

            pstmt = conn.prepareStatement("select last_insert_id()");
            ResultSet rs = pstmt.executeQuery();
            if(rs != null && rs.next()) {
                user.setUId(rs.getInt(1));
            }
        } catch (SQLException e) {
            throw e;
        } finally {
            DataSourceUtils.releaseConnection(conn, dataSource);
        }
        return user;
    }

然后你在逻辑层就可以用spring的�Q何方式管理事务了�?br>如：注册

    public User register(User user) throws SQLException {
        userDao.backUp(user);
        userDao.insert(user);
        return user;
    }

��浪�?/a> 2007-08-20 11:22 发表评论

jsp �?引用 spring ��理的Bean

Mon, 13 Aug 2007 09:22:00 GMT

�׃��没有用MVC框架�Q�所以在view层的不能由Spring依赖注入�Q�现在我jsp��面又想引用Spring��理的Bean�Q�那怎么办。用WebApplicationContextUtils帮助�c�R��jsp��面如下�Q?br>

<%@ page language="java" pageEncoding="UTF-8"%>
<%@ page import="org.springframework.web.context.support.WebApplicationContextUtils" %>
<%@ page import="org.springframework.web.context.WebApplicationContext" %>
<%
WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(this.getServletContext());
%>

��浪�?/a> 2007-08-13 17:22 发表评论

Tue, 08 May 2007 07:44:00 GMT

攉��于网�l?br>
首先�Q�需要将�l�承了SimpleFormController之类的sessionForm设�ؓtrue。这��P��在显�C�Z��个新表单�Ӟ��Spring会将command存放在session中，而在提交表单�Ӟ��Spring会从session中取出此command�Q�随后立即从session中删除存放command的attribute。如果发现在session中没有command�Q�Spring��其断定为重复提交，转而执行handleInvalidSubmit(request, response)�Q�可覆盖此方法负责防止重复提交的��d��。可以这么说�Q�当setSessionForm(true)之后�Q�如果没有先后经历显�C��单、提交表单的�q�程�Q�就会被认�ؓ是重复提交表单。而有一些情况下却必��重复提交表单，如，修改数据库的数据后，试图写入数据库时因某些异常失败，如果此时异常被当前页面捕获�ƈ依旧�q�回当前��面�Q�由于command已经被Spring在后��C��session中移赎ͼ�因此�Q�就被认为是无效重复提交�Q�从而导致第二次�l�修改后的记录无法正��提交到数据库中。handleInvalidSubmit()必须考虑到这�U�情��c�?

��浪�?/a> 2007-05-08 15:44 发表评论

spring with c3p0

Sun, 18 Mar 2007 09:06:00 GMT

参考：(willpower88兄的blog) http://www.aygfsteel.com/willpower88/archive/2007/01/10/92928.html

当我spring中用c3p0时第一�ơ老出�?br />org.hibernate.exception.JDBCConnectionException: could not execute query
��h��后就不会。一番折腑֐�直接�?lt;property name="" value="" />��可以了。随后找到willpower88兄的blog他�ȝ��得很好�?br />
环境�Q?br />spring 2.0
c3p0-0.9.0.4

spring配置文�g如下(引用willpower88兄的�Q�注释掉的都有问题的�Q�：

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"   destroy-method="close">
         <property name="driverClass" value="com.mysql.jdbc.Driver" />
         <property name="jdbcUrl" value="jdbc:mysql://localhost/test"/>
         <property name="user" value="root"/>
         <property name="password" value=""/>

         <property name="minPoolSize" value="2"/>
         <property name="maxPoolSize" value="20"/>
         <property name="maxIdleTime" value="1800"/>
         <property name="acquireIncrement" value="2"/>
         <property name="maxStatements" value="0"/>
         <property name="initialPoolSize" value="3"/>
         <property name="idleConnectionTestPeriod" value="1800"/>
         <property name="acquireRetryAttempts" value="30"/>
         <property name="breakAfterAcquireFailure" value="true"/>
         <property name="testConnectionOnCheckout" value="false"/>


bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
  <property name="dataSource" ref="dataSource"/>
  <property name="mappingDirectoryLocations">
      <list>
   <value>classpath:/com/licaionline/domain/value>
      list>
  property>
  <property name="hibernateProperties">
   <props>
     <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialectprop>
     <prop key="hibernate.show_sql">trueprop>
     <prop key="hibernate.generate_statistics">trueprop>
     <prop key="hibernate.connection.release_mode">autoprop>
     <prop key="hibernate.autoReconnect">trueprop>
     <prop key="hibernate.cglib.use_reflection_optimizer">trueprop>



   props>
  property>
bean>

��浪�?/a> 2007-03-18 17:06 发表评论

ajax与spring �l�合

Thu, 01 Mar 2007 14:05:00 GMT

转蝲 http://www.javabc.com/Html/javakyjs/java_kyajax/87263814176488.html

Spring的集成几乎异常简�?只需要更攚w��|�文件而已.

��面的代码不用动�Q�例�?br>

doc.simple-spring.jsp

< script language = " javascript " >
var springEndPoint = " <%=request.getContextPath()%>/remoting/Spring-buffalo " ;
function pageMethod() {
var buffalo = new Buffalo(springEndPoint);
buffalo.remoteCall( " yourObject.yourMethod " ,[], function (reply) {
var Obj = reply.getResult();
})
}
script >

web部��v描述文�g
web.xml

xml version="1.0" encoding="UTF-8"?>
DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
    <display-name>Buffalo Web Remoting Demostration Applicationdisplay-name>
    <context-param>
        <param-name>contextConfigLocationparam-name>
        <param-value>
            /WEB-INF/applicationContext.xml
        param-value>
    context-param>
    <servlet>
        <servlet-name>contextservlet-name>
        <servlet-class>                   org.springframework.web.context.ContextLoaderServlet                servlet-class>
        <load-on-startup>1load-on-startup>
    servlet>

    <servlet>
        <servlet-name>remotingservlet-name>
        <servlet-class>                  org.springframework.web.servlet.DispatcherServlet                servlet-class>
        <load-on-startup>4load-on-startup>
    servlet>
        <servlet-mapping>
        <servlet-name>remotingservlet-name>
        <url-pattern>/remoting/*url-pattern>
    servlet-mapping>
web-app>

以前的buffalo-service.properties文�g则不�?applicationContext.xml所替代�?
其中引用到的bean可以是�Q意被Spring托管的bean.�q�个Controller可以被�Q意�Q意方式的ServletDispather调用.

applicationContext.xml

<beans>
    <bean name="simpleService" class="net.buffalo.demo.simple.SimpleService">         bean>
    <bean name="numberService" class="net.buffalo.demo.numberguess.NumberGuessService">        bean>
beans>

remoting-servlet.xml

<beans>
  <bean name="/Spring-buffalo" class="net.buffalo.spring.BuffaloServiceExporter">
    <property name="services">
            <map>
                <entry key="simpleService">
                    <ref bean="simpleService"/>
                entry>
        <entry key="numberService">
                    <ref bean="numberService"/>
                entry>
            map>
        property>bean>beans>

��浪�?/a> 2007-03-01 22:05 发表评论

在线免费黄色毛片,国产福利免费在线观看,青青草这里只有精品

spring 依赖注入到直接new 对象

jsp �?引用 spring ���理的Bean

spring with c3p0

ajax与spring �l�合

jsp �?引用 spring ��理的Bean