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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。

       ![](https://img-blog.csdnimg.cn/ce40b8c6fa9749809f63ef6eeca056f7.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5bCP5oeS54yrKi0q,size_18,color_FFFFFF,t_70,g_se,x_16)

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();
    }

}
标签: java

本文转载自: https://blog.csdn.net/qq_34565436/article/details/123899845
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