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)
@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();
}

}

来源：https://www.cnblogs.com/whalesea/p/11677657.html