获取运行jar同目录文件

package person.pluto.natcross2;

import java.io.*;
import java.net.URL;
import java.util.Properties;


//获取项目打成jar之后 获取运行项目jar同目录的文件
public class PropertiesUtil {

    public static void main(String[] args) {


//        URL url = PropertiesUtil.class.getResource("");
//        System.out.println(url.getPath());

//        URL resource = PropertiesUtil.class.getResource("/");
//        System.out.println(resource);
//
//        URL resource1 = PropertiesUtil.class.getResource(".");
//        System.out.println(resource1.getPath());

        String host = getStringProperties("config.properties", "host");
        System.out.println(host);

    }

    /**
     *
     * @param fileName 打成jar后同目录下的文件名 例:config.properties
     * @param host  文件中的key 例:host
     * @return
     */
    public static String getStringProperties(String fileName, String host) {
        URL url = PropertiesUtil.class.getResource("/");
        if(url==null){
            url = PropertiesUtil.class.getResource("");
        }
        String str = url.getPath();
//       str = "file:/C:/Users/38956/Desktop/toserver/PropertiesUtil.jar!/person/pluto/natcross2/";
        int i2 = str.indexOf("/"); //第一个/的位置
        int i = str.indexOf(".jar!");
        if(i>0){
            str = str.substring(i2+1, i);
        }

        int i3 = str.lastIndexOf("/");
        str = str.substring(0,i3+1);
        int i1 = str.indexOf(":");
        if(i1==-1){
            str = "/"+str;
        }

        //获取到jar运行的系统中的绝对路径 C:/Users/38956/Desktop/toserver/

        Properties properties = new Properties();
        // 使用InPutStream流读取properties文件
        BufferedReader bufferedReader = null;
        try {
            bufferedReader = new BufferedReader(new FileReader(str+fileName));
            properties.load(bufferedReader);
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 获取key对应的value值
        return properties.getProperty(host);
    }

    /**
     *
     * @param fileName 打成jar后同目录下的文件名 例:config.properties
     * @param host  文件中的key 例:host
     * @return
     */
    public static int getIntProperties(String fileName, String host) {
        return Integer.parseInt(getStringProperties(fileName, host));
    }


}