解析(读取)JSON串(文件)

1、JSON文件存放位置

2、JSON文件

{
    "took": 25,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 3,
            "relation": "eq"
        },
        "max_score": 1,
        "hits": [
            {
                "_index": "test_index",
                "_type": "_doc",
                "_id": "WaM573IBve72Lwpkd7GZ",
                "_score": 1,
                "_source": {
                    "f1": "1111111111",
                    "f2": "109.130.21.56",
                    "f3": 368,
                    "sysCreateTime": 1593151201391
                }
            },
			{
                "_index": "test_index",
                "_type": "_doc",
                "_id": "BTR32REG32RVBG4353V3",
                "_score": 1,
                "_source": {
                    "f1": "2222222222",
                    "f2": "119.10.2.156",
                    "f3": 68,
                    "sysCreateTime": 1593151201391
                }
            },
			{
                "_index": "test_index",
                "_type": "_doc",
                "_id": "GTR12GREGQ23R43FR23V",
                "_score": 1,
                "_source": {
                    "f1": "3333333333",
                    "f2": "139.130.21.56",
                    "f3": 8,
                    "sysCreateTime": 1593151201391
                }
            }
            
        ]
    }
}

3、Maven依赖

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>fastjson</artifactId>
	<version>1.2.71</version>
</dependency>

4、代码

String readJsonFile(String fileName) {
	String jsonStr = "";
	try {
		File jsonFile = new File(fileName);
		FileReader fileReader = new FileReader(jsonFile);
		Reader reader = new InputStreamReader(new FileInputStream(jsonFile),"utf-8");
		int ch = 0;
		StringBuffer sb = new StringBuffer();
		while ((ch = reader.read()) != -1) {
			sb.append((char) ch);
		}
		fileReader.close();
		reader.close();
		jsonStr = sb.toString();
		return jsonStr;
	} catch (IOException e) {
		e.printStackTrace();
		return null;
	}
}
@Test
void testJson(){
	String path = Delete111ApplicationTests.class.getClassLoader().getResource("test.json").getPath();
	String str = readJsonFile(path);
	JSONObject jsonObject = JSON.parseObject(str);
	JSONArray jsonArray = jsonObject.getJSONObject("hits").getJSONArray("hits");
	for (int i = 0; i < jsonArray.size(); i++) {
		System.out.println(jsonArray.getJSONObject(i).getJSONObject("_source").getString("f1"));
	}
}

5、输出结果

1111111111
2222222222
3333333333