【Properties文件】Java使用Properties来读取配置文件

配置文件位置及内容

执行结果

程序代码

---

package Utils.ConfigFile;
 
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
 
public class PropertiesTest {
 
    /**
     * 获取属性文件
     * @param path  属性文件路径
     * @return
     */
    public static Properties getPropsFile(String path) {
        Properties props = new Properties();
        try {
            File file = new File(path);
            InputStream in = new BufferedInputStream(new FileInputStream(file));
 
            //解决中午乱码问题--因为字节流无法读取中文，所以采用reader把inputStream转换成reader用字符流来读取中文
            BufferedReader bf = new BufferedReader(new InputStreamReader(in));
            props.load(bf);
            in.close();
        } catch (Exception e) {
            return null;
        }
        return props;
    }
 
    /**
     * 显示所有键值
     * @param properties
     */
    public static void showKeys(Properties properties){
        Enumeration<?> enumeration = properties.propertyNames();
 
        System.out.println("======下面将显示所有key值============");
        while(enumeration.hasMoreElements()){
            Object key = enumeration.nextElement();
            System.out.println(key);
        }
    }
 
    /**
     * 显示所有value值
     * @param properties
     */
    public static void showValues(Properties properties){
        Enumeration<?> enumeration = properties.elements();
 
        System.out.println("======下面将显示所有value值============");
        while(enumeration.hasMoreElements()){
            Object value = enumeration.nextElement();
            System.out.println(value);
        }
    }
 
    /**
     * 显示所有key，value
     * @param properties
     */
    public static void showKeysAndValues(Properties properties){
        Iterator<Map.Entry<Object, Object>> it= properties.entrySet().iterator();
 
        System.out.println("======下面将显示所有<key,value>值---方式1============");
        while (it.hasNext()) {
            Map.Entry<Object, Object> entry = it.next();
            Object key = entry.getKey().toString();
            Object value = entry.getValue();
            System.out.println("<" + key + "," + value + ">");
        }
    }
 
    /**
     * 显示所有key，value
     * @param properties
     */
    public static void showKeysAndValues2(Properties properties){
        System.out.println("======下面将显示所有<key,value>值--方式2============");
        for (Map.Entry<Object, Object> entry: properties.entrySet()) {
            Object key = entry.getKey();
            Object value = entry.getValue();
            System.out.println("<" + key + "," + value + ">");
        }
    }
 
    public static void main(String args[]) {
        Properties propFile = getPropsFile("C:\\myProperties.properties");
 
        showKeys(propFile);
        showValues(propFile);
        showKeysAndValues(propFile);
        showKeysAndValues2(propFile);
    }
}