How does SpringBoot read JSON files in the resource directory?

Idea

Use Spring's ResourceUtils to read the json file in the resource directory.

Use common-io to convert the read file into a json string.

Use fastjson to deserialize json strings into objects.

Example

1.Maven depends on

pom.xml, mainly the introduction of common-io and fastjson.

<!-- 资源目录资源文件读取 -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.11.0</version>
        </dependency>

        <!-- 反序列化json字符串 -->
        <dependency>
            <groupId>com.alibaba.fastjson2</groupId>
            <artifactId>fastjson2</artifactId>
            <version>2.0.14</version>
        </dependency>

2.json resource file

notice.json, simply list the json content to be used.

[
  {
    "title": "新功能xxx上线",
    "content": "支持xxx"
  },
  {
    "title": "旧功能xxx下线",
    "content": "不支持xxx"
  }
]

3. Read json Service

3.1. Define the interface

package com.example.springbootjson.service;

import com.example.springbootjson.domain.NoticeInfo;

import java.io.IOException;
import java.util.List;

/**
 * @author hongcunlin
 */
public interface NoticeService {
    /**
     * 获取公告
     *
     * @return 公告
     * @throws IOException 文件
     */
    List<NoticeInfo> getNoticeInfoList() throws IOException;
}

3.2. Implement the interface

This can be said to be the core part of this article , you can see the implementation in the code for details, read the notice.json json file through ResourceUtils, convert the file into a json string through common-io's FileUtils, and deserialize the json object through fastjson's JSON.

package com.example.springbootjson.service.impl;

import com.alibaba.fastjson2.JSON;
import com.example.springbootjson.domain.NoticeInfo;
import com.example.springbootjson.service.NoticeService;
import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.ResourceUtils;

import java.io.File;
import java.io.IOException;
import java.util.List;

/**
 * @author hongcunlin
 */
@Service
public class NoticeServiceImpl implements NoticeService {

    @Override
    public List<NoticeInfo> getNoticeInfoList() throws IOException {
        File file = ResourceUtils.getFile("classpath:notice.json");
        String json = FileUtils.readFileToString(file, "UTF-8");
        List<NoticeInfo> noticeInfoList = JSON.parseArray(json, NoticeInfo.class);
        return noticeInfoList;
    }
}

4. Test interface

Write a simple integration test, inject the Service written above, execute the method, and print the execution results.

package com.example.springbootjson;

import com.example.springbootjson.service.NoticeService;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;
import java.io.IOException;

@SpringBootTest
class SpringbootJsonApplicationTests {
    @Resource
    private NoticeService noticeService;

    @Test
    void contextLoads() throws IOException {
        System.out.println(noticeService.getNoticeInfoList());
    }
}

You can see that the content in the json file can be output normally, indicating that our program is correct.

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