SpringBoot获取Resource资源

资源文件位置

方式一

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/2.jpg。只能在开发工具中使用，部署之后无法读取。（不通用）

@Test
    public void testReadFile2() throws IOException {
        File file = new File("src/main/resources/2.jpg");
        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();
    }

方式二

使用org.springframework.util.ResourceUtils，读取。在linux环境中无法读取。（不通用）

@Test
    public void testReadFile3() throws IOException {
        File file = ResourceUtils.getFile("classpath:2.jpg");
        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();
    }

方式三

使用org.springframework.core.io.ClassPathResource，各种环境都能读取。（通用）

    @Test
    public void testReadFile() throws IOException {
//        ClassPathResource classPathResource = new ClassPathResource("2.jpg");
        Resource resource = new ClassPathResource("2.jpg");
        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();
    }

方式四

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 EttpCustomApplicationTests {

    @Autowired
    ResourceLoader resourceLoader;
    
    
    @Test
    public void testReaderFile() throws IOException {
        Resource resource = resourceLoader.getResource("classpath:2.jpg");
        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();
    }

}