java(包括springboot)读取resources下文件方式实现

本文主要介绍了java(包括springboot)读取resources下文件方式实现，分享给大家，具体如下：

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)@SpringBootTestpublic 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(); }}

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