java读取JSON文件的多种实现方式

{
	"ID": 10001,
	"detail": "detail",
	"json_format_version": 1.0,
	"other_info": {
		"array_one": [
			[855, 410],
			[854, 411],
			[847, 411],
			[846, 410],
			[845, 410],
			[844, 409]
		],
		"array_two": [
			[832, 303],
			[829, 303],
			[828, 302],
			[825, 302],
			[824, 301]
		],
		"array_three": [
			[1013, 224],
			[1012, 225],
			[1010, 225],
			[1009, 226],
			[1023, 224]
		],
		"point": [853, 310],
		"boolean": true
	}
}

package com.tool;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Map;

/**
 * @Author halon
 * @create 2021/9/
 */
public class ReadLocalJsonFileDemo {
    public static void main(String[] args) throws IOException {
        File file = new File("F:\\halon.json");
        readerMethod(file);

    }
    private static void readerMethod(File file) throws IOException {
        FileReader fileReader = new FileReader(file);
        Reader reader = new InputStreamReader(new FileInputStream(file), "Utf-8");
        int ch = 0;
        StringBuffer sb = new StringBuffer();
        while ((ch = reader.read()) != -1) {
            sb.append((char) ch);
        }
        fileReader.close();
        reader.close();
        String jsonStr = sb.toString();
        System.out.println(JSON.parseObject(jsonStr));
    }
}

package com.tool;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Map;

/**
 * @Author halon
 * @create 2021/9/
 */
public class ReadLocalJsonFileDemo {
    public static void main(String[] args) throws IOException {
        File file = new File("F:\\halon.json");
        jacksonMethod(file);
    }
    private static void jacksonMethod(File file) throws IOException {
        ObjectMapper objectMapper = new ObjectMapper();
        System.out.println(objectMapper.readValue(file, Map.class));
    }

package com.tool;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Map;

/**
 * @Author halon
 * @create 2021/9/
 */
public class ReadLocalJsonFileDemo {
    public static void main(String[] args) throws IOException {
        File file = new File("F:\\halon.json");
        nioMethod(file);
    }

    private static void nioMethod(File file) throws IOException {
        String jsonString = new String(Files.readAllBytes(Paths.get(file.getPath())));
        System.out.println(JSONObject.parseObject(jsonString));
    }