java读取Resources下文件

1. 第一种，读为流文件

InputStream path = this.getClass().getResourceAsStream("/data.txt");
BufferedReader reader = new BufferedReader(new InputStreamReader(path));

2. 第二种， 读取路径

Thread.currentThread().getContextClassLoader()。  
URL l1 =   
Thread.currentThread().getContextClassLoader().getResource("readFile/test1.xml");  
System.out.println(l1);  
  
URL l2 =   
Thread.currentThread().getContextClassLoader().getResource("collection/test2.xml");  
System.out.println(l2);  
  
URL l3 = Thread.currentThread().getContextClassLoader().getResource("test3.xml");  
String l4=l3.getPath();//加上getPath()则去掉前面的file:  
System.out.println(l3);  //     file:/F:/demo/Studying/out/production/Studying/test3.xml  
System.out.println(l4);//      /F:/demo/Studying/out/production/Studying/test3.xml  

2. 第三种， 读为流文件

InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("conf/job_two_one_mapping.txt");  
try(Scanner scanner = new Scanner(is)) {  
    while (scanner.hasNextLine()) {  
        System.out.println(scanner.nextLine());  
    }  
} catch (Exception e) {  
    log.error("读取文件数据异常" ,e);  
}  

4. 第四种， 读取路径

ResourceBundle bundle = ResourceBundle.getBundle("config");
String url = bundle.getString("url");

该方法默认读取的是resources文件夹下的以.properties为后缀的文件，代码中的例子即为config.properties

5. 第五种， 读为流文件

InputStream inputStream = Resources.class.getResourceAsStream(“/mybatis.xml”);或者
InputStream resourceAsStream = Resources.class.getClassLoader().getResourceAsStream("a.py");

6. 第六种， 读取路径

URL resource = Resources.class.getClassLoader().getResource("");
String path = resource.getPath();
底层如下：
public static URL getResource(String resourceName) {
 ClassLoader loader = MoreObjects.firstNonNull(
  Thread.currentThread().getContextClassLoader(),
  Resources.class.getClassLoader());
 URL url = loader.getResource(resourceName);
 checkArgument(url != null, "resource %s not found.", resourceName);
 return url;
}

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