Hutool 39 [extra Quality] 【4K 2024】

The reverse of above.

public class UserImporter { public static void main(String[] args) { // #10, #11: Create and read a file FileUtil.touch("users.csv"); String csvContent = FileUtil.readUtf8String("users.csv"); // #32: Parse CSV CsvReader reader = CsvUtil.getReader(); List<CsvRow> rows = reader.read(StrUtil.getReader(csvContent)); // #6, #7: Collection handling List<User> users = CollUtil.newArrayList(); for (CsvRow row : rows) if (CollUtil.isEmpty(row)) continue; // #1: Safe conversion String name = Convert.toStr(row.get(0), "Anonymous"); String birthStr = row.get(1); // #19, #22: Date parsing and age calculation DateTime birth = DateUtil.parse(birthStr); int age = DateUtil.ageOfNow(birth); // #36: Unique ID String userId = IdUtil.fastSimpleUUID(); User u = new User(userId, name, age); users.add(u); // #30: Bean copy to DTO List<UserDTO> dtos = CollUtil.newArrayList(); for (User u : users) UserDTO dto = new UserDTO(); BeanUtil.copyProperties(u, dto); dtos.add(dto); // #18: Notification via embedded server (simulated) HttpUtil.post("http://localhost:8080/api/import", BeanUtil.beanToMap(dtos)); System.out.println(StrUtil.format("Imported {} users", users.size())); } } hutool 39

Sends form-urlencoded POST data.

Copy properties while ignoring specified fields. The reverse of above

Read Excel files (both .xls and .xlsx ) without Apache POI’s complexity. Read Excel files (both

Write defensive checks in one line. Throws IllegalArgumentException if condition fails. Part 3: Real-World Example (Using 10 of the 39 Methods) Let’s combine multiple methods from the “Hutool 39” set to build a user import script:

Reads an entire file into a single string. Perfect for small config files.