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life and I

Spring入门到精通笔记

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概述

模块划分

  • 核心是控制反转，通过配置文件完成业务对象间的依赖注入。
  • 提供事物处理功能
  • 简单有效的JDBC应用
  • 强大灵活的Web框架

特点

  • 良好的分层
  • 以IOC为核心，促使开发人员面向接口编程
  • 良好架构设计
  • 代替EJB
  • MVC代替MVC2
  • 和Struts, Hibernate结合

安装

安装Eclipse及插件

下载eclipse安装

Help->Install New Software 添加插件库 http://download.eclipse.org/webtools/repository/indigo/ 然后进行安装

ubuntu安装tomcat

设置eclipse及tomcat

Setting up a Tomcat server in Eclipse

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sudo apt-get install tomcat7
cd /usr/share/tomcat7
sudo ln -s /var/lib/tomcat7/conf conf
sudo ln -s /etc/tomcat7/policy.d/03catalina.policy conf/catalina.policy
sudo ln -s /var/log/tomcat7 log
sudo chmod -R 777 /usr/share/tomcat7/conf

Installation

Config with Eclipse

HelloWorld

基础例子

创建工程

创建一个java工程

添加依赖库

需要在build path中添加

  • commons-logging-1.1.1.jar
  • log4j-1.2.16.jar
  • slf4j-api-1.6.1.jar
  • slf4j-log4j12-1.6.4.jar
  • spring-asm-3.2.0.M1.jar
  • spring-beans-3.2.0.M1.jar
  • spring-context-3.2.0.M1.jar
  • spring-core-3.2.0.M1.jar
  • spring-expression-3.2.0.M1.jar

添加代码

HelloWorld.java
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package Hello;

public class HelloWorld {

  public String msg = null;

  public void setMsg(String s){
      this.msg = s;
  }

  public String getMsg(){
      return msg;
  }
}
TestHello.java
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package Hello;


import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import Hello.HelloWorld;

public class TestHello {
  public static void main(String[] args) throws Exception{
      ApplicationContext helloContext = new FileSystemXmlApplicationContext(
              "config.xml");
      HelloWorld hw = (HelloWorld)helloContext.getBean("HelloWorld");
      System.out.println(hw.getMsg());
  }

}

配置log4j以及config.xml

log4j.properties
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log4j.rootLogger=DEBUG, A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%-4r %-5p [%t] %37c %3x - %m%n
config.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
  <bean id="HelloWorld" class="Hello.HelloWorld">
      <property name="msg">
          <value>HelloWorld</value>
      </property>
  </bean>
</beans>

其中

改写例子

定义接口

HelloInter.java
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package Hello;

public interface HelloInter {
      public String doSalutation();
}

实现EnHello和CnHello

ChHello.java
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package Hello;

public class ChHello implements HelloInter{
  public String msg = null;
  public void setMsg(String msg){
      this.msg = msg;
  }
  public String getMsg(){
      return msg;
  }

  public String doSalutation(){
      return "你好" + this.msg;
  }
}
EnHello.java
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package Hello;

public class EnHello implements HelloInter{
  private String msg = null;
  public void setMsg(String s){
      this.msg = s;
  }
  public String getMsg(){
      return this.msg;
  }
  public String doSalutation(){
      return "Welcome" + this.msg;
  }
}

更新TestHello

TestHello.java
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package Hello;


import org.springframework.context.ApplicationContext;

public class TestHello {
  public static void main(String[] args) throws Exception{
      ApplicationContext helloContext = new FileSystemXmlApplicationContext(
              "config.xml");
      HelloWorld hw = (HelloWorld)helloContext.getBean("HelloWorld");
      System.out.println(hw.getMsg());

      System.out.println("\n============\n");

      HelloInter ch = (HelloInter)helloContext.getBean("CnHello");
      System.out.println(ch.doSalutation());

      System.out.println("\n============\n");

      HelloInter eh = (HelloInter)helloContext.getBean("EnHello");
      System.out.println(eh.doSalutation());
  }

}

修改config.xml

config.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="HelloWorld" class="Hello.HelloWorld">
<property name="msg">
<value>HelloWorld</value>
</property>
</bean>
<bean id="CnHello" class="Hello.ChHello">
<property name="msg" value='嗨'></property></bean>
<bean id="EnHello" class="Hello.EnHello">
<property name="msg" value="Hi"></property></bean>
</beans>

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