本文主要介紹了java(包括springboot)讀取resources下文件方式實現，分享給大家，具體如下：
1、使用項目內路徑讀取，該路徑只在開發工具中顯示，類似：src/main/resources/resource.properties。只能在開發工具中使用，部署之后無法讀取。（不通用）
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File file = new File("src/main/resources/resource.properties"); |
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@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，讀取。在linux環境中無法讀取。（不通用）
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File file = ResourceUtils.getFile("classpath:resource.properties");FileInputStream fis = new FileInputStream(file); |
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@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，各種環境都能讀取。（通用）
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Resource resource = new ClassPathResource("resource.properties");InputStream is = resource.getInputStream(); |
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@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、結合spring注解，使用org.springframework.core.io.ResourceLoader;類的注解。（通用）
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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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原文鏈接：https://www.cnblogs.com/whalesea/p/11677657.html
