Java 读取配置文件

config.properties

配置文件中的中文需要转码为unicode

key1 = value1
key2 = value2
key3 = value3
\u8bed\u8a00 = \u4e2d\u6587

xml.properties

需要添加 dtd

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
    <entry key="key5">test</entry>
    <entry key="key6">10</entry>
    <entry key="唔">哈哈</entry>
</properties>

读取类

import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.InvalidPropertiesFormatException;
import java.util.Map;
import java.util.Properties;
import java.util.ResourceBundle;

/**
 * .properties 中文需要转换为unicode 编码    https://www.w3cschool.cn/tools/index?name=unicode_chinese
 * 
 * src/main/java 和 src/main/resources下的配置文件其实在同一目录下 -> classes
 * 
 * @author yz20537
 *
 */
public class ConfigurationUtils {
    
    public static void main(String[] args) throws IOException {
        
        //read config.properties
        resourceBundlePropertiesReader("config");               //put the file src/main/java
        resourceBundlePropertiesReader("resources");            //put the file src/main/resources
        classStreamPropertiesReader("/config.properties");      //put the file src/main/java
        classStreamPropertiesReader("/resources.properties");   //put the file src/main/resources
        
        //read config.xml
        xmlReader("/config.xml");       //put the file src/main/java
        xmlReader("/resources.xml");    //put the file src/main/resources

        
        
        System.out.println(configurationMap);
    }

    private static Map<String, String> configurationMap = new HashMap<String, String>();

    static void resourceBundlePropertiesReader(String path) {
        ResourceBundle resource = ResourceBundle.getBundle(path);
        Enumeration<String> keys = resource.getKeys();
        while (keys.hasMoreElements()) {
            String key = keys.nextElement();
            configurationMap.put(key, resource.getString(key));
        }
    }

    static void classStreamPropertiesReader(String path) throws IOException {
        Properties props = new Properties();
        InputStream in = ConfigurationUtils.class.getResourceAsStream(path);
        props.load(in);
        fromPropertiesToMap(props);
        in.close();
    }

    static void xmlReader(String path) throws InvalidPropertiesFormatException, IOException{
        Properties properties = new Properties();
        InputStream inputStream =ConfigurationUtils.class.getResourceAsStream(path);
        properties.loadFromXML(inputStream);
        fromPropertiesToMap(properties);
        inputStream.close();
        
    }
    
    static void fromPropertiesToMap(Properties props){
        Enumeration<Object> keys = props.keys();
        while (keys.hasMoreElements()) {
            String key = keys.nextElement().toString();
            configurationMap.put(key, props.getProperty(key));
        }
    }
}