1 举例1：读取项目根目录下的数据。
 2 private static void readRoot() throws FileNotFoundException, IOException {
 3     BufferedReader br = new BufferedReader(new FileReader(
 4 new File("jnb.txt")));        
 5            String line = br.readLine();
 6            System.out.println(line);
 7 }
 8 举例2：读取和class文件同目录的资源数据。
 9 private static void readClassPath() throws FileNotFoundException,
10             IOException {
11         URL url= SoreceReader.class.getResource("jnb.txt");
12         String path = url.getPath();
13         System.out.println(path);
14         BufferedReader br = new BufferedReader(
15 new FileReader(new File(path)));    
16         String line = br.readLine();
17         System.out.println(line);
18 }

举例3：读取在src目录的资源数据。//文件放在上几级目录下
private static void readBin() throws FileNotFoundException, IOException {
        URL url= SoreceReader.class.getResource("../../../jnb.txt");
        String path = url.getPath();
        System.out.println(path);
        BufferedReader br = new BufferedReader(
new FileReader(new File(path)));    
        String line = br.readLine();
        System.out.println(line);
}
可以直接返回一个指定资源的输入流对象。
public static void main(String[] args) throws Exception{
    InputStream in = SoreceReader.class.getResourceAsStream("../../../jnb.txt");   
        BufferedReader br = new BufferedReader(
new InputStreamReader(in));
        String line = br.readLine();
        System.out.println(line);
}
getResourceAsStream VS getResource
getResourceAsStream直接返回了流对象因此无法获取资源的信息。
getResource直接返回的是资源的绝对路径，那么封装File可以快速的获取资源的信息。所有在文件下载的时候一般使用该方法。