java读取resources下文件代码示例

  • H5W3
  • 2021-04-10 12:50:15

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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