类 Properties 的使用 实例

java 代码

DataBase.properties的内容


driver=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/jpetstore
username=root
password=dongguoh

DataBase.xml的内容

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
<comment>PropertiesTest</comment>
<entry key="driver">com.mysql.jdbc.Driver</entry>
<entry key="url">jdbc:mysql://127.0.0.1:3306/jpetstore</entry>
<entry key="username">root</entry>
<entry key="password">dongguoh</entry>
</properties>

下面是测试类

package DataBase;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Iterator;
import java.util.Properties;
import java.util.Set;


public class TestProperties {

public static void main(String[] args) {
    TestProperties test=new TestProperties();
    test.luanch();
    test.luanchXML();

}
private void luanch(){
    Properties ppt=new Properties();
    try {
     String path=this.getClass().getResource("/").getPath();
     path=path+"DataBase/DataBase.properties";
     FileInputStream fis=new FileInputStream(path);
     ppt.load(fis);
     fis.close();
     Set set=ppt.keySet();
     Iterator it=set.iterator();
System.out.println("*********显示的读取DataBase.properties显示的内容*****");
     while(it.hasNext()){
      String id=(String)it.next();
System.out.println(id+"="+ppt.getProperty(id));
     }

System.out.println("另外一种显示方式");
     ppt.list(System.out);
    } catch (FileNotFoundException e) {
     System.out.println("找不到DataBase.properties这个文件，或者是路径发生错误");
    } catch (IOException e) {
     System.out.println("加载DataBase.properties文件时出错！！");
    }
}
private void luanchXML(){
    Properties ppt=new Properties();
    try {
     String path=this.getClass().getResource("/").getPath();
     path=path+"DataBase/DataBase.xml";
System.out.println(path);
     FileInputStream fis=new FileInputStream(path);
     ppt.loadFromXML(fis);
     fis.close();
     Set set=ppt.keySet();
     Iterator it=set.iterator();
System.out.println("*********显示的读取DataBase.xml 显示的内容*****");
     while(it.hasNext()){
      String id=(String)it.next();
System.out.println(id+"="+ppt.getProperty(id));
     }
    } catch (FileNotFoundException e) {
     System.out.println("找不到DataBase.xml 这个文件，或者是路径发生错误");
    } catch (IOException e) {
     System.out.println("加载DataBase.xml 文件时出错！！");
    }
}

}



结果：

*********显示的读取DataBase.properties显示的内容*****
password=dongguoh
url=jdbc:mysql://127.0.0.1:3306/jpetstore
driver=com.mysql.jdbc.Driver
username=root
另外一种显示方式
-- listing properties --
url=jdbc:mysql://127.0.0.1:3306/jpetstore
password=dongguoh
driver=com.mysql.jdbc.Driver
username=root
/E:/MyJavaProject/Ibatis/WebRoot/WEB-INF/classes/DataBase/DataBase.xml
*********显示的读取DataBase.xml 显示的内容*****
password=dongguoh
url=jdbc:mysql://127.0.0.1:3306/jpetstore
driver=com.mysql.jdbc.Driver
username=root