转载：https://www.cnblogs.com/whalesea/p/11677657.html
1、使用项目内路径读取，该路径只在开发工具中显示，类似：src/main/resources/resource.properties。只能在开发工具中使用，部署之后无法读取。（不通用）
File file = new File("src/main/resources/resource.properties");
@Test
publicvoidtestReadFile2()throws IOException {
File file =newFile("src/main/resources/resource.properties");
FileInputStream fis =new FileInputStream(file);
InputStreamReader isr =new InputStreamReader(fis);
BufferedReader br =new BufferedReader(isr);
String data =null;
while((data = br.readLine()) !=null) {
System.out.println(data);
}
br.close();
isr.close();
fis.close();
}
2、使用org.springframework.util.ResourceUtils，读取。在linux环境中无法读取。（不通用）
File file = ResourceUtils.getFile("classpath:resource.properties");
FileInputStream fis = new FileInputStream(file);
@Test
publicvoidtestReadFile3()throws IOException {
File file = ResourceUtils.getFile("classpath:resource.properties");
FileInputStream fis =new FileInputStream(file);
InputStreamReader isr =new InputStreamReader(fis);
BufferedReader br =new BufferedReader(isr);
String data =null;
while((data = br.readLine()) !=null) {
System.out.println(data);
}
br.close();
isr.close();
fis.close();
}
3、使用org.springframework.core.io.ClassPathResource，各种环境都能读取。（通用）
Resource resource = new ClassPathResource("resource.properties");
InputStream is = resource.getInputStream();
@Test
publicvoidtestReadFile()throws IOException {// ClassPathResource classPathResource = new ClassPathResource("resource.properties");Resource resource =newClassPathResource("resource.properties");
InputStream is = resource.getInputStream();
InputStreamReader isr =new InputStreamReader(is);
BufferedReader br =new BufferedReader(isr);
String data =null;
while((data = br.readLine()) !=null) {
System.out.println(data);
}
br.close();
isr.close();
is.close();
}
4、结合spring注解，使用org.springframework.core.io.ResourceLoader;类的注解。（通用）
package com.tsinkai.ettp;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.core.io.Resource;import org.springframework.core.io.ResourceLoader;import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTestpublicclass EttpCustomApplicationTests {
@Autowired
ResourceLoader resourceLoader;
@Test
publicvoidtestReaderFile()throws IOException {
Resource resource = resourceLoader.getResource("classpath:resource.properties");
InputStream is = resource.getInputStream();
InputStreamReader isr =new InputStreamReader(is);
BufferedReader br =new BufferedReader(isr);
String data =null;
while((data = br.readLine()) !=null) {
System.out.println(data);
}
br.close();
isr.close();
is.close();
}
}
