Properties类

水深无声 2023-08-17 16:09 10阅读 0赞

Properties类：继承了HashTable实现了Map接口，用于对配置文件的操作。

（1）setProperty与getProperty的使用：

![1392562-20190817101734007-537736675.png][]

![1392562-20190817101743117-1478489917.png][]

import java.util.Properties;
    
    public class PropertiesDemo {
        public static void main(String[] args) {
            Properties p = new Properties();
            p.setProperty("河南", "郑州");
            p.setProperty("江苏", "南京");
            p.setProperty("河北", "石家庄");
            p.setProperty("辽宁", "沈阳");
            p.setProperty("安徽", "合肥");
    
            String value1 = p.getProperty("河南");
            String value2 = p.getProperty("江苏");
            String value3 = p.getProperty("河北");
            String value4 = p.getProperty("辽宁");
            String value5 = p.getProperty("安徽");
    
            System.out.println(value1);
            System.out.println(value2);
            System.out.println(value3);
            System.out.println(value4);
            System.out.println(value5);
        }
    }

2、读取文件与写入（字节和文本）

package pers.zzz.Read;
    
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.util.Properties;
    
    public class ReadProperties {
        public static void main(String[] args) throws IOException {
            Properties prop = new Properties();
            FileInputStream i = new FileInputStream("E:\\IO流\\java\\catalina.properties");
    
            prop.load(i);
            System.out.println(prop);
            i.close();
        }
    
    }

![1392562-20190817104053247-1700307695.png][]

import java.io.FileWriter;
    import java.io.IOException;
    import java.util.Properties;
    
    public class PropertiesDemo {
        public static void main(String[] args) throws IOException {
            Properties p = new Properties();
            p.setProperty("河南", "郑州");
            p.setProperty("江苏", "南京");
            p.setProperty("河北", "石家庄");
            p.setProperty("辽宁", "沈阳");
            p.setProperty("安徽", "合肥");
    
        FileWriter fw=new FileWriter("E:\\IO流\\java\\catalina.properties");
        p.store(fw,"");
        fw.close();
        }
    }

![1392562-20190817104733216-1231952511.png][]

转载于:https://www.cnblogs.com/zhai1997/p/11367781.html

[1392562-20190817101734007-537736675.png]: /images/20230810/49ace72c4d7249c5b09c406100744ac4.png
[1392562-20190817101743117-1478489917.png]: /images/20230810/885d47830c624fb69eb2d12af7c606ab.png
[1392562-20190817104053247-1700307695.png]: /images/20230810/d554fc9b8d9840ae90665875453ada2a.png
[1392562-20190817104733216-1231952511.png]: /images/20230810/8b4ac4616f51472dac8ced35eb01b678.png