从 Spring Boot 中的资源文件夹中读取文件 [英] Read file from resources folder in Spring Boot

问题描述

我正在使用 Spring Boot 和 json-schema-validator.我正在尝试从 resources 文件夹中读取一个名为 jsonschema.json 的文件.我尝试了几种不同的方法，但无法正常工作.这是我的代码.

ClassLoader classLoader = getClass().getClassLoader();File file = new File(classLoader.getResource("jsonschema.json").getFile());JsonNode mySchema = JsonLoader.fromFile(file);

这是文件的位置.

在这里我可以看到 classes 文件夹中的文件.

但是当我运行代码时出现以下错误.

jsonSchemaValidator 错误:java.io.FileNotFoundException:/home/user/Dev/Java/Java%20Programs/SystemRoutines/target/classes/jsonschema.json(没有这样的文件或目录)

我在代码中做错了什么?

解决方案

在花了很多时间试图解决这个问题之后，终于找到了一个有效的解决方案.该解决方案利用了 Spring 的 ResourceUtils.应该也适用于 json 文件.

感谢 Lokesh Gupta 写得很好的页面:

package utils;导入 org.slf4j.Logger;导入 org.slf4j.LoggerFactory;导入 org.springframework.util.ResourceUtils;导入 java.io.FileInputStream;导入 java.io.IOException;导入 java.io.InputStream;导入 java.util.Properties;导入 java.io.File;公共类实用程序{私有静态最终记录器 LOGGER = LoggerFactory.getLogger(Utils.class.getName());公共静态属性 fetchProperties(){属性 properties = new Properties();尝试 {File file = ResourceUtils.getFile("classpath:application.properties");InputStream in = new FileInputStream(file);properties.load(in);} catch (IOException e) {LOGGER.error(e.getMessage());}返回属性；}}

回答评论中的一些问题:

很确定我使用 java -jar target/image-service-slave-1.0-SNAPSHOT.jar

在 Amazon EC2 上运行了这个

看看我的 github 存储库:https://github.com/johnsanthosh/image-service找出从 JAR 运行它的正确方法.

I'm using Spring Boot and json-schema-validator. I'm trying to read a file called jsonschema.json from the resources folder. I've tried a few different ways but I can't get it to work. This is my code.

ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("jsonschema.json").getFile());
JsonNode mySchema = JsonLoader.fromFile(file);

This is the location of the file.

And here I can see the file in the classes folder.

But when I run the code I get the following error.

jsonSchemaValidator error: java.io.FileNotFoundException: /home/user/Dev/Java/Java%20Programs/SystemRoutines/target/classes/jsonschema.json (No such file or directory)

What is it I'm doing wrong in my code?

解决方案

After spending a lot of time trying to resolve this issue, finally found a solution that works. The solution makes use of Spring's ResourceUtils. Should work for json files as well.

Thanks for the well written page by Lokesh Gupta : Blog

package utils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.ResourceUtils;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.io.File;


public class Utils {

    private static final Logger LOGGER = LoggerFactory.getLogger(Utils.class.getName());

    public static Properties fetchProperties(){
        Properties properties = new Properties();
        try {
            File file = ResourceUtils.getFile("classpath:application.properties");
            InputStream in = new FileInputStream(file);
            properties.load(in);
        } catch (IOException e) {
            LOGGER.error(e.getMessage());
        }
        return properties;
    }
}

To answer a few concerns on the comments :

Pretty sure I had this running on Amazon EC2 using java -jar target/image-service-slave-1.0-SNAPSHOT.jar

Look at my github repo : https://github.com/johnsanthosh/image-service to figure out the right way to run this from a JAR.

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