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@GetMapping("/previewPDF") public void download(HttpServletRequest request, HttpServletResponse response) throws IOException { String filePath = "G:\\JAVA\\xxx.pdf"; File f = new File(filePath); if (!f.exists()) { response.sendError(404, ".

/** * 描述：list集合深拷贝 参考 https://blog.youkuaiyun.com/u011019141/article/details/81182149 */ public static <T> List<T> deepCopy(List<T> src) { try { ByteArrayOutputStream byteout = new ByteArrayOutputStream(); ObjectOutputStream out = ne

public List<String> convertStreamToString(MultipartFile file){ List<String> list = new ArrayList<>(); try (InputStream inputStream = file.getInputStream()) { BufferedReader reader = new BufferedReader(new InputStreamReader(

带有Async方法 就是个 新开一条线程，否则就是和上面执行共用一条线程 runAsync @Test public void test01() throws ExecutionException, InterruptedException { // 没有返回结果 CompletableFuture<Void> async = CompletableFuture.runAsync(() -> { System.out.println("begin ===

在Gateway中跨域配置 @Configuration public class GlobalCorsConfiguration { @Bean public CorsWebFilter corsWebFilter() { UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(); CorsConfiguration config = new CorsC.

多级菜单实现方式 gitee代码 Java组装 递归 按照Sort进行排序 public List<CategoryEntity> list() { //1、查出所有分类 List<CategoryEntity> entities = baseMapper.selectList(null); //2、组装成父子的树形结构 //2.1）、找到所有的一级分类 List<CategoryEntity> level1Menus = enti