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();
}
}总结
