java（包括springboot）读取resources下文件方式

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

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

    public void testReadFile2() throws IOException {

        File file = new File("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

    public void testReadFile3() 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

    public void testReadFile() throws IOException {

//        ClassPathResource classPathResource = new ClassPathResource("resource.properties");

        Resource resource = new ClassPathResource("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)

@SpringBootTest

public class EttpCustomApplicationTests {

    @Autowired

    ResourceLoader resourceLoader;

    @Test

    public void testReaderFile() 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();

    }

}