springboot读写json文件，格式化写入json，java

源码地址

https://gitee.com/618859/java_springboot_upload_image

package com.example.java_springboot_uploadimg.controller;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONArray;import com.alibaba.fastjson.serializer.SerializerFeature;import org.springframework.boot.system.ApplicationHome;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.multipart.MultipartFile;import java.util.HashMap;import java.util.Map;import java.util.UUID;import com.alibaba.fastjson.JSONObject;import org.apache.commons.io.FileUtils;import java.io.File;import java.io.IOException;// 上传图片参考b站视频 https://www.bilibili.com/video/BV1TK41Z7ad/spm_id_from=333.337.search-card.all.click&vd_source=125d80bbad2b8400f21b16a0f64@RestControllerpublic class helloController {    // 写入文件    private boolean writeFile(String content, String targetPath){        try {            if(content != null){                // String json = JSONObject.toJSONString(content);                File file = new File(targetPath);                FileUtils.writeStringToFile(file, content,"UTF-8",false);                return true;            }        }catch (IOException e){            System.out.println("error-writeFile: "+e);        }        return false;    }    // 读取文件    public JSONArray readFile(String filePath) throws IOException {        File file = new File(filePath);        String content = FileUtils.readFileToString(file,"UTF-8");        System.out.println("content:"+content);        JSONArray arr = JSON.parseArray(content);        System.out.println("jsonObject:"+arr);        // System.out.println“姓名是：”+jsonObject.getString("name"));        // System.out.println(年龄:"+jsonObject.getDouble("age"));        // System.out.println(”学到的技能:"+jsonObject.getJSONArray("major"));        // System.out.println“国家：”+jsonObject.getJSONObject("Nativeplace").getString("country"));         return arr;    }    public String getJsonPath(){        String projectPath = this.getProjectPath();        projectPath = projectPath + "//src//main//resources//me.json";        return projectPath;    }    @GetMapping("/getData")    public JSONArray getData() throws IOException {        String projectPath = this.getJsonPath();        JSONArray object = this.readFile(projectPath);        return object;    }    @PostMapping("/upload")    public JSONArray upload(MultipartFile file) throws IOException {        System.out.println(有人进来-);        // 1.获取文件名        String fileName = file.getOriginalFilename();        Integer index = fileName.lastIndexOf(".");        Integer pointIndex = fileName.length()-(fileName.length()-index);        String name = fileName.substring(0,pointIndex);        String etc = fileName.substring(pointIndex);        System.out.println(后缀:"+etc);        // 2.重命名文件，避免重复覆盖        String uuid = UUID.randomUUID().toString().replace"""";        uuid = uuid.substring(0, 10);        fileName = name+"_"+uuid+etc;        System.out.println("fileName："+fileName);        // 3.获取要存储的路径        String targetPath = "";        targetPath = this.getProjectPath();        targetPath = targetPath + "//src//main//resources//static//images//" + fileName;        // 4.写入文件        try{            file.transferTo(new File(targetPath));            // 读取json文件            String jsonPath = this.getJsonPath();            JSONArray arr = this.readFile(jsonPath);            Map map = new HashMap();            map.put("name", name);            map.put("img", "images/"+fileName);            JSONObject obj = new JSONObject(map);            arr.add(obj);            System.out.println数据：“数据：”+arr);            // 重写文件保存 SerializerFeature.PrettyFormat 是重点，格式化写入美            // 参考网址 https://www.jb51.net/article/197667.htm            this.writeFile(JSONArray.toJSONString(arr, SerializerFeature.PrettyFormat), jsonPath);            // 返回前端            return arr;        } catch (IOException e){            e.printStackTrace();        }        return new JSONArray();    }    public String getProjectPath(){        ApplicationHome applicationHome = new ApplicationHome(this.getClass());        String targetPath = applicationHome.getDir().getParentFile().getParentFile().getAbsolutePath();        return targetPath;    }}

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>com.example</groupId>    <artifactId>java_springboot_uploadImg</artifactId>    <version>0.0.1-SNAPSHOT</version>    <name>java_springboot_uploadImg</name>    <description>java_springboot_uploadImg</description>    <properties>        <java.version>1.8</java.version>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>        <spring-boot.version>2.6.13</spring-boot.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->        <dependency>            <groupId>commons-io</groupId>            <artifactId>commons-io</artifactId>            <version>2.4</version>        </dependency>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>fastjson</artifactId>            <version>2.0.6</version>        </dependency>    </dependencies>    <dependencyManagement>        <dependencies>            <dependency>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-dependencies</artifactId>                <version>${spring-boot.version}</version>                <type>pom</type>                <scope>import</scope>            </dependency>        </dependencies>    </dependencyManagement>    <build>        <plugins>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-compiler-plugin</artifactId>                <version>3.8.1</version>                <configuration>                    <source>1.8</source>                    <target>1.8</target>                    <encoding>UTF-8</encoding>                </configuration>            </plugin>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>                <version>${spring-boot.version}</version>                <configuration>                    <mainClass>com.example.java_springboot_uploadimg.JavaSpringbootUploadImgApplication</mainClass>                    <skip>true</skip>                </configuration>                <executions>                    <execution>                        <id>repackage</id>                        <goals>                            <goal>repackage</goal>                        </goals>                    </execution>                </executions>            </plugin>        </plugins>    </build></project>