jar包同目录生成文件实现方式

java -jar /path/to/testapikey/canon2-0.0.1-SNAPSHOT.jar

package com.example.canon2;

import java.io.File;
import java.net.URL;
import java.security.CodeSource;

public class JsonFilePathUtil {
    public static File getJsonFileInJarDir(String jsonFileName) throws Exception {
        CodeSource codeSource = JsonFilePathUtil.class.getProtectionDomain().getCodeSource();
        if (codeSource != null) {
            URL location = codeSource.getLocation();
            if (location != null) {
                String urlStr = location.toString();
                // 处理 jar:file:/path/to/your.jar!/ 这种格式
                if (urlStr.startsWith("jar:")) {
                    urlStr = urlStr.substring(4, urlStr.indexOf("!"));
                }
                if (urlStr.startsWith("file:")) {
                    File jarFile = new File(new URL(urlStr).toURI());
                    File jarDir = jarFile.isFile() ? jarFile.getParentFile() : jarFile;
                    if (jarDir != null) {
                        return new File(jarDir, jsonFileName);
                    }
                }
            }
        }
        // fallback: 当前工作目录
        return new File(jsonFileName);
    }

    public static void main(String[] args) throws Exception {
        File jsonFile = getJsonFileInJarDir("result.json");
        System.out.println("json file path: " + jsonFile.getAbsolutePath());
        // 这里可以继续写入 json 文件
    }
}