两种方式

String path = "excel/constant.xlsx" ；

// 直接获取文件

1 File file1 = new DefaultResourceLoader().getResource(path).getFile();

// 获取路径

2 String file = Thread.currentThread().getContextClassLoader().getResource(path).getFile();

InputStream in = new FileInputStream(file);

文件位置

获取的是编译后路径

3 其他方式

ConstantChangeController.class.getResource("").getPath(); // 类当前路径

/D:/Projects/ipaas/iuap-ipaas-dataintegration-develop/gwportal/target/classes/com/yonyou/nccloud/gwp/integrated/

ConstantChangeController.class.getResource("/").getPath(); // resource 下路径

/D:/Projects/ipaas/iuap-ipaas-dataintegration-develop/gatewayweb-starter/target/classes/

ConstantChangeController.class.getClassLoader().getResource("").getPath(); // resource 下路径

/D:/Projects/ipaas/iuap-ipaas-dataintegration-develop/gatewayweb-starter/target/classes/

ConstantChangeController.class.getClassLoader().getResource("/").getPath(); // 无法获取

4 直接获取 InputStream

InputStream resourceAsStream = ConstantChangeController.class.getResourceAsStream(path);