Hello Spring（1）代替属性文件

文件结构：

files structure

HelloSpring.java (1)

 1 package test;
 2 
 3 public class HelloSpring {
 4     
 5     private String name;
 6 
 7     public String getName() {
 8         return name;
 9     }
10 
11     public void setName(String name) {
12         this.name = name;
13     }
14     
15     public String hello(){
16         return "hello " + name ;
17     }
18 
19 }

Tester.java

 1 package test;
 2 
 3 public class Tester {
 4     
 5     public static void main( String[] args){
 6         
 7         HelloSpring helloSpring = new HelloSpring();
 8         
 9         String name = "杨";
10         helloSpring.setName(name);
11         
12         System.out.println( helloSpring.hello() );
13         
14     }
15 
16 }

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 ：

 1 package test;
 2 
 3 import java.io.IOException;
 4 import java.util.Properties;
 5 
 6 public class Tester {
 7     
 8     public static void main( String[] args){
 9         
10         HelloSpring helloSpring = new HelloSpring();
11         
12         
13         
14         String name = "杨1";
15         
16         System.out.println( name );
17         
18         Properties properties = new Properties(); 
19         try {
20             properties.load(Tester.class.getClassLoader().getResourceAsStream("Name.properties"));
21             name = properties.getProperty("name");
22         } catch (IOException e) {
23             // TODO Auto-generated catch block
24             e.printStackTrace();
25         }
26         
27         helloSpring.setName(name);
28         
29         System.out.println( helloSpring.hello() );
30         
31     }
32 
33 }

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

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:

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

修改

update

1 <?xml version="1.0" encoding="UTF-8"?>
2 <!DOCTYPE beans PUBLIC "" "http://www.springframework.org/dtd/spring-beans.dtd" >
3 <beans>
4 
5     <bean id="helloSpring" class="test.HelloSpring">
6         <property name="name" value="杨力权"></property>
7     </bean>
8 
9 </beans>

第3版本的 Tester.java

3rd version of Tester.java

 1 package test;
 2 
 3 import org.springframework.beans.factory.BeanFactory;
 4 import org.springframework.beans.factory.xml.XmlBeanFactory;
 5 import org.springframework.core.io.ClassPathResource;
 6 import org.springframework.core.io.Resource;
 7 
 8 @SuppressWarnings("deprecation")
 9 public class Tester {
10     
11     public static void main( String[] args){
12         
13         Resource r = new ClassPathResource("beans.xml");
14         BeanFactory factory = new XmlBeanFactory(r);
15         
16         HelloSpring helloSpring = (HelloSpring)factory.getBean("helloSpring");
17         
18         System.out.println( helloSpring.hello() );
19         
20     }
21 
22 }

结果

result