java Config配置文件读取

反射技术的运用、工场设计模式的运用、Config配置文件的读取
项目结构：

image
testConfig.properties为配置文件；
ConfigValue为接口类；
ConfigValueFactory工场类；
Stringvalue、IntValue、BooleanValue是实现ConfigValue接口的实现类；
ConfigTest程序入口和读取配置文件
testConfig.properties清单：
[xhtml] view plaincopy

ip=10.111.14.43
port=4444
name=/u5434/u6167/u6587
islocal=false

ConfigValue.java清单：
[java] view plaincopy

package wuhuiwen.config;
public interface ConfigValue {
public Object getValue(Object value);
}

ConfigValueFactory.java清单：
[java] view plaincopy

package wuhuiwen.config;
public class ConfigValueFactory {
public static ConfigValue getConfigValue(Class<?> className) {
try {
return (ConfigValue) Class.forName(
new StringBuffer().append("wuhuiwen.config.")
.append(
className.getSimpleName().substring(0, 1)
.toUpperCase()).append(
className.getSimpleName().substring(1)).append(
"Value").toString()).newInstance();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}

Stringvalue.java清单：
[java] view plaincopy

package wuhuiwen.config;
// 字符串
public class StringValue implements ConfigValue{
public Object getValue(Object value) {
return value.toString();
}
}

IntValue.java清单：
[java] view plaincopy

package wuhuiwen.config;
// 整数
public class IntValue implements ConfigValue{
public Object getValue(Object value) {
return Integer.parseInt(value.toString());
}
}

BooleanValue.java清单：
[java] view plaincopy

package wuhuiwen.config;
public class BooleanValue implements ConfigValue {
public Object getValue(Object value) {
return new Boolean(value.toString());
}
}

ConfigTest.java清单：
[java] view plaincopy

package wuhuiwen.config.test;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.util.Properties;
import wuhuiwen.config.ConfigValue;
import wuhuiwen.config.ConfigValueFactory;
public class ConfigTest {
public static String IP;
public static int PORT;
public static String NAME;
public static Boolean ISLOCAL;
/**
* 配置文件读取测试
* 利用反射、工厂模式等概念,
* @param args
*/
public static void main(String[] args) {
ConfigTest.readConfig();
System.out.println(IP);
System.out.println(PORT);
System.out.println(NAME);
System.out.println(ISLOCAL);
}
public static void readConfig() {
InputStream inputStream = ConfigTest.class.getClassLoader()
.getResourceAsStream("testConfig.properties");
Properties p = new Properties();
try {
p.load(inputStream);
} catch (IOException e) {
e.printStackTrace();
}

    Field field[] = ConfigTest.class.getFields();  
    for (Field f : field) {  
        System.out.println(f.getType().getSimpleName());  
        ConfigValue cf = ConfigValueFactory.getConfigValue(f.getType());  
        Object ov = p.get(f.getName().toLowerCase());  
        Object ovs = cf.getValue(ov);  
        try {  
            f.set(null,ovs);  
        } catch (IllegalArgumentException e) {  
            e.printStackTrace();  
        } catch (IllegalAccessException e) {  
            e.printStackTrace();  
        }  
    }  
      
    /*System.out.println("ip:" + p.getProperty("ip") + ",port:" 
            + p.getProperty("port") + ",name:" + p.getProperty("name"));*/  
}  

}

运行结果：

image

在更加实际的项目中，应该做异常处理（String 转 int，String转boolean等）