1 package com.dhb.file;
 2
 3 import java.io.FileNotFoundException;
 4 import java.io.FileReader;
 5 import java.io.FileWriter;
 6 import java.io.IOException;
 7 import java.util.Map.Entry;
 8 import java.util.Properties;
 9 import java.util.Set;
10
11 /**
12  * @author DSHORE / 2018-7-18
13  *
14  */
15 public class Demo24 {
16     public static void main(String[] args) throws Exception {
17         //createProperties();
18         readProperties();
19     }
20     //读取配置文件的信息
21     public static void readProperties() throws Exception, IOException{
22         //创建Properties对象
23         Properties properties=new Properties();
24         //加载配置文件信息到Properties里面
25         properties.load(new FileReader("F:\\person.properties"));
26         //遍历
27         /*Set<Entry<Object,Object>> entrys=properties.entrySet();
28         for (Entry<Object, Object> entry : entrys) {
29             System.out.println("键："+entry.getKey()+"，值："+entry.getValue());
30             //修改密码
31             //把修改后的properties在生成一个配置文件
32             properties.setProperty("李四","001");
33             properties.store(new FileWriter("F:\\person.properties"), "This is QQ account and password properties");
34         }*/
35         //修改密码
36         //把修改后的properties在生成一个配置文件
37         properties.setProperty("李四","007");
38         properties.store(new FileWriter("F:\\person.properties"), "This is QQ account and password properties");
39     }
40     //创建配置文件
41     public static void createProperties() throws FileNotFoundException, IOException{
42         //创建一个配置文件
43         Properties properties=new Properties();
44         properties.setProperty("张三", "123");
45         properties.setProperty("李四", "234");
46         properties.setProperty("王五","345");
47         //遍历Properties
48         /*Set<Entry<Object,Object>> entrys=properties.entrySet();
49         for (Entry<Object, Object> entry : entrys) {
50             System.out.println("键："+entry.getKey()+"，值："+entry.getValue());
51         }*/
52
53         //使用Properties生产配置文件.
54         //properties.store(new FileOutputStream("F:\\person.properties"), "hehe");//第一个参数是一个输出流对象,第二参数是描述这个配置文件的信息
55         properties.store(new FileWriter("F:\\person.properties"), "This is QQ account and password properties");
56     }
57 }