Hello Spring（1）代替属性文件

文件结构：

files structure

HelloSpring.java (1)

package test;

public class HelloSpring {
    
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    
    public String hello(){
        return "hello " + name ;
    }

}

Tester.java

package test;

public class Tester {
    
    public static void main( String[] args){
        
        HelloSpring helloSpring = new HelloSpring();
        
        String name = "杨";
        helloSpring.setName(name);
        
        System.out.println( helloSpring.hello() );
        
    }

}

运行：右键 Tester.java > Run As > 2 Java Application

run: right click Tester.java Run As > 2 Java Application

结果：

result

 

以上内容告一段落，下面把 name 属性的值写到配置文件里去。

so much here, follow is put the propertie of name into properties file

新建一 Name.properties 配置文件：

new file: Name.properties

目录结构：

file structure

右键 src > New > Others > File

right click src > New > Others > File

File name: Name.properties

内容：

content:

name=\u6768\u529b\u6743

下面是汉字转 unicode 的方法：

mothed of trans from Chines to unicode:

[点击这里打开链接]

click here to open the url

点击 “进入应用” 按钮：

click the button which name is enter the application

转换结果：

result of trans:

\u6768\u529b\u6743

Tester.java ：

package test;

import java.io.IOException;
import java.util.Properties;

public class Tester {
    
    public static void main( String[] args){
        
        HelloSpring helloSpring = new HelloSpring();
        
        
        
        String name = "杨1";
        
        System.out.println( name );
        
        Properties properties = new Properties(); 
        try {
            properties.load(Tester.class.getClassLoader().getResourceAsStream("Name.properties"));
            name = properties.getProperty("name");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        helloSpring.setName(name);
        
        System.out.println( helloSpring.hello() );
        
    }

}

右键 right click and select Run As > Java Application ( Alt + Shift +x, j )

以上内容是 Spring 的一个思路：使用配置文件来代替代码。

the idea of above is : use the properties file instead the code.

让我们再次告一段落，下面感受 Spring （ 感觉春天 ）。

so let's have a rest, later, let's enjoy the Spring .

引入3 个 jar 包

copy 3 jar files to lib

下载 DTD 文件：

download DTD file: 

http://www.springframework.org/dtd/

拷贝到 WEB-INF 目录下：

copy the file to WEB-INF path:

右键 src > New > Others > XML File

right click "src" >New > Others > XML File

Next

Next

Next

Next

Finish

beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans SYSTEM "../WebContent/WEB-INF/spring-beans-2.0.dtd" >
<beans></beans>

这个内容报错了：

something is wrong:

在网上搜了一下，先用这个:

search the Internet then use this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "" "http://www.springframework.org/dtd/spring-beans.dtd" >
<beans></beans>

修改

update

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "" "http://www.springframework.org/dtd/spring-beans.dtd" >
<beans>

    <bean id="helloSpring" class="test.HelloSpring">
        <property name="name" value="杨力权"></property>
    </bean>

</beans>

第3版本的 Tester.java

3rd version of Tester.java

package test;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;

@SuppressWarnings("deprecation")
public class Tester {
    
    public static void main( String[] args){
        
        Resource r = new ClassPathResource("beans.xml");
        BeanFactory factory = new XmlBeanFactory(r);
        
        HelloSpring helloSpring = (HelloSpring)factory.getBean("helloSpring");
        
        System.out.println( helloSpring.hello() );
        
    }

}

结果

result