java读取resources下文件代码示例

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。

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。

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。

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。

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();

}

}

5、结合springboot注解,自定义一个资源类,可以使用get/set方式读取单个属性。

需要根据具体资源文件内容创建资源类,和对应属性

resource.properties内容

com.tsinkai.ettp.name=imooc

com.tsinkai.ettp.website=www.imooc.com

com.tsinkai.ettp.language=java

资源类:

package com.imooc.pojo;

import org.springframework.boot.context.properties.ConfigurationProperties;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.PropertySource;

@Configuration

@ConfigurationProperties(prefix="com.imooc.opensource")//属性前缀

@PropertySource(value="classpath:resource.properties")//文件路径

public class Resource {

private String name;

private String website;

private String language;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getWebsite() {

return website;

}

public void setWebsite(String website) {

this.website = website;

}

public String getLanguage() {

return language;

}

public void setLanguage(String language) {

this.language = language;

}

}

调用方式:

package com.tsinkai.ettp;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.springframework.beans.BeanUtils;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.boot.test.context.SpringBootTest;

import org.springframework.test.context.junit4.SpringRunner;

import com.tsinkai.ettp.common.Resource;

@RunWith(SpringRunner.class)

@SpringBootTest

public class EttpCustomApplicationTests {

@Autowired

Resource customResource;

@Test

public void readResource() {

Resource bean = new Resource();

BeanUtils.copyProperties(customResource, bean);

System.out.println(bean.getName());

}

}

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