springboot读取resources下文件方式

项目中很多时候需要读取自定义配置文件，本地开发工具怎么写都成功但是部署到服务其上就出现问题，

异常BOOT-INF/classes!/config.xml (文件名、目录名或卷标语法不正确.)路径中带有叹号之类的

了解了大概之后就是springboot打成jar是一个文件，也就是一个压缩包，没有办法读取压缩文件里的路径，因此要解决这个问题了解读取配置文件的原理，直接获取文件流就可以了。

1、使用项目内路径读取，只能在开发工具中使用，部署之后无法读取。（不通用）

类似：src/main/resources/default.xml

File file = new File("src/main/resources/default.xml");

    @Test     public void testReadFile2() throws IOException {         File file = new File("src/main/resources/default.xml");         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:default.xml");
FileInputStream fis = new FileInputStream(file);

    @Test     public void testReadFile3() throws IOException {         File file = ResourceUtils.getFile("classpath:default.xml");         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     public void testReadFile() throws IOException { //        ClassPathResource classPathResource = new ClassPathResource("default.xml");         Resource resource = new ClassPathResource("default.xml");         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）

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) @SpringBootTest public class ApplicationTests {      @Autowired     ResourceLoader resourceLoader;               @Test     public void testReaderFile() throws IOException {         Resource resource = resourceLoader.getResource("classpath:default.xml");         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();     }  }