JAVA读取绝对路径文件和项目类路径下的文件的方法

//1、JAVA原生读取绝对路径InputStreaminput=newFileInputStream("C:\\code\\study\\Springboot26Demo\\src\\main\\resources\\graphql\\test.gqls");
intlen=input.available();
byte[] bytes=newbyte[len];
input.read(bytes);
input.close();
Stringcontent=newString(bytes,"UTF-8");
System.out.println(content);
//2、JAVA原生读取Classpath路径 graphql/test.gqls存放在src\\main\\resources目录下ClassLoaderloader=FileReadMain.class.getClassLoader();
InputStreaminput=loader.getResourceAsStream("graphql/test.gqls");
intlen=input.available();
byte[] bytes=newbyte[len];
input.read(bytes);
input.close();
Stringcontent=newString(bytes,"UTF-8");
System.out.println(content);
//3、Spring工具读取绝对路径Resourceresource=newFileSystemResource("C:\\code\\study\\Springboot26Demo\\src\\main\\resources\\graphql\\test.gqls");
InputStreaminput=resource.getInputStream();
intlen=input.available();
byte[] bytes=newbyte[len];
input.read(bytes);
input.close();
Stringcontent=newString(bytes,"UTF-8");
System.out.println(content);
//4、Spring工具读取Classpath路径 graphql/test.gqls存放在src\\main\\resources目录下Resourceresource=newClassPathResource("graphql/test.gqls");
InputStreaminput=resource.getInputStream();
intlen=input.available();
byte[] bytes=newbyte[len];
input.read(bytes);
input.close();
Stringcontent=newString(bytes,"UTF-8");
System.out.println(content);