Java读取properties配置文件

需要导入的jar

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>5.3.14</version>
</dependency>

方法：使用Spring PropertiesLoaderUtils.loadProperties();

方法一

    public static void readProperties4() throws IOException {
        ClassPathResource resource = new ClassPathResource("loginParam.properties");
        // 在config目录下
        //ClassPathResource resource = new ClassPathResource("config/jdbc.properties");
        Properties properties= PropertiesLoaderUtils.loadProperties(resource);
        System.out.println("pwd="+properties.getProperty("pwd"));

    }

方法二

import org.springframework.core.io.support.PropertiesLoaderUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.*;

/**
 * @Auther: yxchun
 * @Date: 2022/5/22 - 18:20
 * @Description:
 * @Version:1.0
 */
public class ReadPropertiesUtils {

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


    private static void loadlProperty(Properties props) throws UnsupportedEncodingException {

        @SuppressWarnings("rawtypes")
        Enumeration en = props.propertyNames();
        while (en.hasMoreElements()) {
            String key = (String) en.nextElement();
            String value = props.getProperty(key);
            // 解决properties value值乱码
            value=new String(value.getBytes("ISO-8859-1"),"gbk");
            propertiesMap.put(key, value);
        }
    }

    public static String getValue(String key, String fileName) {

        Properties prop = null;
        try {
            // 通过Spring中的PropertiesLoaderUtils工具类进行获取
            prop = PropertiesLoaderUtils.loadAllProperties(fileName);
            loadlProperty(prop);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return propertiesMap.get(key);
    }


    public static Map<String,String> loadAllProperty(String filePath) throws IOException {
        Map<String,String> loginParamMap = new HashMap<>();
        // 通过Spring中的PropertiesLoaderUtils工具类进行获取
        Properties props = PropertiesLoaderUtils.loadAllProperties(filePath);
        @SuppressWarnings("rawtypes")
        Enumeration en = props.propertyNames();
        while (en.hasMoreElements()) {
            String key = (String) en.nextElement();
            String value = props.getProperty(key);
            // 解决properties value值乱码
            value=new String(value.getBytes("ISO-8859-1"),"gbk");
            loginParamMap.put(key, value);
        }
        return loginParamMap;
    }

    public static void main(String[] args) throws IOException {
        Map<String, String> stringStringMap = loadAllProperty("loginParam.properties");
        Set<String> keys = stringStringMap.keySet();
        for (String key:keys){
            System.out.println(key+"="+stringStringMap.get(key));
        }

    }
}