大部分内容参考自： https://blog.csdn.net/csdn_halon/article/details/120287992
在开发过程中有时会遇到需要读取本地.json文件的需求，通常会自己写Reader代码去读，但是这么做写出来的代码有些繁琐（需要关流、创建StringBuilder对象等操作）。最近发现几个小工具可以让需求代码变得更加简洁。
准备：
json文件：D:\test.json
{ "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 }}
1.1、添加依赖
com.alibaba fastjson 2.0.12
1.2源代码
import com.alibaba.fastjson.JSON; import java.io.*; public class ReadLocalJsonFileDemo { publicstatic void main(String[] args) throws IOException { Filefile = new File("D:\\test.json"); readerMethod(file); } privatestatic void readerMethod(File file) throws IOException { FileReader fileReader = new FileReader(file); Readerreader = 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(); StringjsonStr = sb.toString(); System.out.println(JSON.parseObject(jsonStr)); }}
1.3.控制台输出
{"other_info":{"array_two":[[832,303],[829,303],[828,302],[825,302],[824,301]],"array_three":[[1013,224],[1012,225],[1010,225],[1009,226],[1023,224]],"boolean":true,"array_one":[[855,410],[854,411],[847,411],[846,410],[845,410],[844,409]],"point":[853,310]},"ID":10001,"detail":"detail","json_format_version":1.0}
2.1、添加依赖
com.fasterxml.jackson.core jackson-databind 2.13.3
2.2源代码
import com.fasterxml.jackson.databind.ObjectMapper; import java.io.File;import java.io.IOException;import java.util.Map; public class ReadLocalJsonFileDemo { publicstatic void main(String[] args) throws IOException { Filefile = new File("D:\\test.json"); jacksonMethod(file); } privatestatic void jacksonMethod(File file) throws IOException { ObjectMapper objectMapper = new ObjectMapper(); System.out.println(objectMapper.readValue(file, Map.class)); }}
2.3.控制台输出
{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}}
3.1、添加依赖
com.alibaba fastjson 2.0.12
3.2源代码
import com.alibaba.fastjson.JSONObject; import java.io.File;import java.io.IOException;import java.nio.file.Files;import java.nio.file.Paths; public class ReadLocalJsonFileDemo { publicstatic void main(String[] args) throws IOException { Filefile = new File("D:\\test.json"); nioMethod(file); } privatestatic void nioMethod(File file) throws IOException { StringjsonString = new String(Files.readAllBytes(Paths.get(file.getPath()))); System.out.println(JSONObject.parseObject(jsonString)); }}
3.3.控制台输出
{"other_info":{"array_two":[[832,303],[829,303],[828,302],[825,302],[824,301]],"array_three":[[1013,224],[1012,225],[1010,225],[1009,226],[1023,224]],"boolean":true,"array_one":[[855,410],[854,411],[847,411],[846,410],[845,410],[844,409]],"point":[853,310]},"ID":10001,"detail":"detail","json_format_version":1.0}
来源地址：https://blog.csdn.net/xijinno1/article/details/129172727
