java读取配置文本文件

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.Properties;

import org.springframework.util.StringUtils;

public class ProperityUtils {

public static String loadProperties2System(String location) throws IOException {
    String configLocation = location;
    File cnf;
    if (!StringUtils.hasLength(location)) {
        configLocation = "./config";
        cnf = new File(configLocation);
        if (!cnf.exists() || !cnf.isDirectory()) {
            configLocation = "../config";
            cnf = new File(configLocation);
        }
    } else {
        cnf = new File(location);
    }

    if (cnf.exists() && cnf.isDirectory()) {
        File[] files = cnf.listFiles();
        if (files != null) {
            File[] pfiles = files;
            int length = files.length;

            for (int i = 0; i < length; ++i) {
                File file = pfiles[i];
                if (file.isFile() && file.getName().endsWith(".properties")) {
                    Properties ppt = new Properties();
                    FileInputStream fi = new FileInputStream(file);
                    Throwable e = null;

                    try {
                        ppt.load(fi);
                        Iterator<String> iterator = ppt.stringPropertyNames().iterator();

                        while (iterator.hasNext()) {
                            String key = iterator.next();
                            System.setProperty(key, ppt.getProperty(key));
                            // if (!System.getProperties().containsKey(key)) {
                            // }
                        }
                    } catch (Throwable e2) {
                        e = e2;
                        throw e2;
                    } finally {
                        if (fi != null) {
                            if (e != null) {
                                try {
                                    fi.close();
                                } catch (Throwable e3) {
                                    e.addSuppressed(e3);
                                }
                            } else {
                                fi.close();
                            }
                        }

                    }
                }
            }
        }
    } else {
        System.out.println("“" + configLocation + "” is not a directory. Can not load any properties file.");
    }

    return configLocation;
}

public static String loadProperty2System(String location) throws IOException {
    File file = new File(location);
    if (file.isFile() && file.getName().endsWith(".properties")) {
        Properties ppt = new Properties();
        FileInputStream fi = new FileInputStream(file);
        Throwable e = null;

        try {
            ppt.load(fi);
            Iterator<String> iterator = (Iterator<String>) ppt.stringPropertyNames().iterator();

            while (iterator.hasNext()) {
                String key = iterator.next();
                System.setProperty(key, ppt.getProperty(key));
                // if (!System.getProperties().containsKey(key)) {
                // }
            }
        } catch (Throwable e2) {
            e = e2;
            throw e2;
        } finally {
            if (fi != null) {
                if (e != null) {
                    try {
                        fi.close();
                    } catch (Throwable e3) {
                        e.addSuppressed(e3);
                    }
                } else {
                    fi.close();
                }
            }

        }
    } else {
        System.out.println("“" + location + "”,Can not load any property file.");
    }

    return file.getAbsolutePath();
}

}