常见文件配置

1. properties

# 键值对写法，要求键不相同，否者后者会覆盖前者
account=root
username=root
password=123
# 层级键值对写法
mysql.account=root
mysql.username=root
mysql.password=123

import java.io.*;
import java.util.Enumeration;
import java.util.Properties;
// 内置函数无需调用
// Properties说明
public Properties(); // 创建空属性列表
void load(InputStream inStream); // 从字符输入流中读取属性列表
String getProperty(String key); // 获取指定键值
void store(OutputStream out, String comments);// 写入properties
void clear(); // 清除所以键值对
// Properties单信息读取
public static String readValue(String filePath, String key){
    Properties props = new Properties();
     try{
         InputStream in = new BufferedInputStream (new FileInputStream(filePath));
         props.load(in);
         return props.getProperty(key);
     }catch(Exception e){
         e.printStackTrace();
         return null;
     }
}
// properties多信息查看
public static void printAllPropperties(String filePath){
    Properties props = new Properties();
    try{
        InputStream in = new BufferedInputStream (new FileInputStream(filePath));
        props.load(in);
        Enumeration en = props.propertyNames();
        while (en.hasMoreElements()) {
            String key = (String)en.nextElement();
            System.out.println(key + " : " + props.getProperty(key));
        }
    }catch(Exception e){e.printStackTrace();}
}
// properties写入
public static void writeProperties(String filePath, String key, String value){
    Properties prop = new Properties();
    try{
        InputStream fis = new FileInputStream(filePath);
        prop.load(fis);
        OutputStream fos = new FileOutputStream(filePath);
        prop.setProperty(key, value);
        prop.store(fos, "Update '" + key + "' value");
    }catch(IOException e){
       System.err.println("Visit "+filePath+" for updating "+key+" value error");
    }
}

2. ini

[mysql]
account=root
username=root
password=123
[redis]
account=user
username=user
password=456

IniFileHelper inifile = new IniFileHelper( GlobalSetting.AppPath + "\\file.ini");
MessageBox.Show(GlobalSetting.AppPath);
    String mysqlAccount = inifile.IniReadValue("mysql", "account");
    String mysqlUsername = inifile.IniReadValue("mysql", "username");
    String mysqlPpassword = inifile.IniReadValue("mysql", "password");

3. yaml / yml

mq:
  data:
    xx:
      - v1
      - v2
mysql:
  data:
    account: root
    username: root
    password: 123

4. xml

lib.keyxml所需jar，将后缀改成7z

<?xml version="1.0" encoding="utf-8" ?>
<mysql>
    <account id="xx">root</account>
    <username>root</username>
    <password>123</password>
</mysql>

//1·加载文件
InputStream stream = test.class.getClassLoader()
    .getResourceAsStream("info.xml");
//2.创建dom4j的解析器
SAXReader saxReader = new SAXReader();
//3.处理xml文件流  xml -> java.document
Document document = saxReader.read(stream);
//4.xpath语法,寻找所需标签
    // 元素标签 / -> 从匹配根标签
    Element username = (Element)document.selectSingleNode("/mysql/username");
    System.out.println(username.getText());
    // 元素标签集， // -> 匹配所有标签
    List<Element> password = document.selectNodes("//password");
    System.out.println(password.get(0).getText());
// 属性找标签
    Attribute id = element.attribute("id"); // 获取属性
    id.getName;id.getValue(); // 获取属性名；获取属性值