Java Web框架 基础知识 读取配置文件 Properties

1、api.properties。

app.base_package=mvc.web
app.jsp_path=/WEB-INF/view/
app.asset_path=/images/,/style/,/js/
app.upload_limit=10
app.upload_path=upload

2、PropertiesUtil.java。

package mvc.framework.util;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

// 属性文件工具类
public final class PropertiesUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(PropertiesUtil.class);

    // 加载属性文件
    public static Properties loadProps(String fileName) {
        Properties props = null;
        InputStream is = null;
        try {
            is = ClassUtil.getClassLoader().getResourceAsStream(fileName);
            if (is == null) {
                throw new FileNotFoundException(fileName + " file is not found");
            }
            props = new Properties();
            props.load(is);
        } catch (IOException e) {
            LOGGER.error("load properties file failure", e);
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                    LOGGER.error("close input stream failure", e);
                }
            }
        }
        return props;
    }

    // 测试
    public static void main(String[] args) {
    	try {
    		Properties cfg = PropertiesUtil.loadProps("api.properties");
    		String base_package = cfg.getProperty("app.base_package");
    		System.out.println(base_package);
    		
    	} catch (Exception e) {
      e.printStackTrace();
    }
    }
}