Java配置文件读取

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# config/test.properties
key1=2018
key2=2019
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// TestProperties.java
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;

import java.io.IOException;
import java.util.Arrays;
import java.util.Properties;
import java.util.stream.Collectors;

public final class TestProperties {
    private static final Properties prop = new Properties();

    static {
        try {
            prop.load(new java.io.FileInputStream(System.getProperty("user.dir").concat("/config/test.properties")));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private TestProperties() {
    }


    public static void main(String args[]) {

        // value
        System.out.println(getValue("key1"));
        System.out.println(getValue("key2"));

        // array
        System.out.println(Arrays
                .stream(getValues(ImmutableList.of(
                        "key1",
                        "key2"
                ).toArray()))
                .collect(Collectors.toList()));

        // map
        ImmutableMap<String, String> map = Maps.fromProperties(prop);
        System.out.println(map);
    }

    public static String getValue(String key) {
        return prop.getProperty(key).trim();
    }

    public static Object[] getValues(Object[] key) {
        int length = key.length;
        Object[] objects = new Object[length];
        for (int i = 0; i < length; i++) {
            objects[i] = prop.getProperty(key[i].toString()).trim();
        }
        return objects;
    }
}