Java读写properties格式配置文件

先贴一下格式

# Properties file with JDBC-related settings.
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=连接地址
jdbc.username=用户名
jdbc.password=密码

读写这种格式的配置文件，利用java.util.Properties类，此类的常用api如下: 

读示例: 

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
public class CH10Main {
public static void main(String[] args) {
Properties test = new Properties();
try {
InputStream input = new FileInputStream("resource/test.properties");
test.load(input);
System.out.println(test.get("age"));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

写示例:

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Properties;
public class CH10Main {
public static void main(String[] args) {
Properties jdbc = new Properties();
jdbc.put("url", "testurl");
jdbc.put("username", "root");
jdbc.put("password", "root");
try {
OutputStream output = new FileOutputStream("resource/jdbc.properties");
jdbc.store(output, "jdbc配置文件!");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

不过需要注意的是Java资源路径问题。