ClassPathResource读取指定文件

朴灿烈づ我的快乐病毒、 2024-03-30 14:28 138阅读 0赞

#### 读取指定文件，转换为jsonObject ####

*  前言
 *  一、提前准备
 *  二、使用ClassPathResource
 *  三、输出结果
 *  总结

--------------------

## 前言 ##

最近的一个需求：  
读取json文件，将文件内容转为jsonObject对象。

--------------------

## 一、提前准备 ##

在resources/static文件内创建jsonpath.json文件  
![在这里插入图片描述][47dd71144ec940ac83e53105f47ac1f5.png]  
jsonPath.json文件内容如下（一个jsonPath的例子）：

{
        
      "store": {
        
        "book": [
          {
        
            "category": "reference",
            "author": "Nigel Rees",
            "title": "Sayings of the Century",
            "price": 8.95
          },
          {
        
            "category": "fiction",
            "author": "Evelyn Waugh",
            "title": "Sword of Honour",
            "price": 12.99
          },
          {
        
            "category": "fiction",
            "author": "Herman Melville",
            "title": "Moby Dick",
            "isbn": "0-553-21311-3",
            "price": 8.99
          },
          {
        
            "category": "fiction",
            "author": "J. R. R. Tolkien",
            "title": "The Lord of the Rings",
            "isbn": "0-395-19395-8",
            "price": 22.99
          }
        ],
        "bicycle": {
        
          "color": "red",
          "price": 19.95
        }
      },
      "expensive": 10
    }

## 二、使用ClassPathResource ##

import com.alibaba.fastjson.JSONObject;
    import org.springframework.core.io.ClassPathResource;
    
    import java.io.IOException;
    import java.io.InputStream;
    
    public class JsonPathDemo {
        
    
        public static JSONObject getJsonObject() {
        
            InputStream defaultColumnInputStream;
            JSONObject json = null;
            try {
        
                ClassPathResource defaultData = new ClassPathResource("static/jsonPath.json");
                defaultColumnInputStream = defaultData.getInputStream();
                json = JSONObject.parseObject(defaultColumnInputStream, JSONObject.class);
                System.out.println(json);
                System.out.println("--------------------");
            } catch (IOException e) {
        
                System.out.println("异常了");
            }
            return json;
        }
    
    
        public static void main(String[] args) {
        
            getJsonObject();
        }
     }

## 三、输出结果 ##

![在这里插入图片描述][6765572bb272400c9ed9c8fdc61e1b2b.png]

{
        "store":{
        "bicycle":{
        "color":"red","price":19.95},"book":[{
        "author":"Nigel Rees","price":8.95,"category":"reference","title":"Sayings of the Century"},{
        "author":"Evelyn Waugh","price":12.99,"category":"fiction","title":"Sword of Honour"},{
        "author":"Herman Melville","price":8.99,"isbn":"0-553-21311-3","category":"fiction","title":"Moby Dick"},{
        "author":"J. R. R. Tolkien","price":22.99,"isbn":"0-395-19395-8","category":"fiction","title":"The Lord of the Rings"}]},"expensive":10}
    --------------------

## 总结 ##

读取文件方式千千万，随手记录一下

[47dd71144ec940ac83e53105f47ac1f5.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/94199456454e4d579c56e66137ce5a4f.png
[6765572bb272400c9ed9c8fdc61e1b2b.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/119f00bcaa264e52a25ff9de1b4d99a4.png