Detailed explanation of commonly used tool classes and APIs in springboot projects

In Spring Boot projects, developers usually rely on someToolsandAPITo simplify development and improve efficiency. The following are some commonly used tool classes and their typical application scenarios, coveringSpring native tools、Third-party libraries (such as Hutool, Guava)andJava comes with tools。

1. Spring Framework comes with its own tool class

(1) StringUtils

• Package name:
• Functions: string nullity, segmentation, splicing, etc.
• Common methods:

boolean isEmpty(Object str);          // Determine whether the string is empty (safeder than Java native)String[] tokenizeToStringArray(...);  // String segmentationString collectionToDelimitedString(...); // Collection to string（If connected with commas）

(2) CollectionUtils

• Package name:
• Function: Collection operation.

boolean isEmpty(Collection<?> coll);  // Determine whether the set is emptyboolean containsAny(Collection<?> source, Collection<?> candidates); // Check if there is any intersection

(3) FileCopyUtils

• Package name:
• Function: File copying and streaming operations.

byte[] copyToByteArray(File file);    // File to byte arrayvoid copy(InputStream in, OutputStream out); // Stream copy

(4) ResourceUtils

• Package name:
• Function: Resource file reading.

File getFile(String location);        // Get resource files（likeclasspath:）

2. Spring Boot-specific tools

(1) ObjectMapper (JSON processing)

• Package name:
• Scene: JSON serialization/deserialization (Spring Boot default integration Jackson).

String json = (obj); // Object to JSONUser user = (json, ); // JSONTransfer object

(2) RestTemplate / WebClient (HTTP request)

• Package name: (synchronous)
• (asynchronous)
• Example:

String result = ("", );

(3) JdbcTemplate (database operation)

• Package name:
• Scenario: Simplify JDBC operations.

List<User> users = ("SELECT * FROM user", new BeanPropertyRowMapper<>());

3. Third-party tool library

(1) Apache Commons StringUtils

boolean isBlank = .(str); // Judge blank strings

FileUtils:

(srcFile, destFile); // File Copy

(2) Google Guava Collection Tools:

List<String> list = ("a", "b"); // Quickly create collections

String processing:

String joined = (",").join(list); // Collection spliced ​​into strings

(3) Hutool (domestic artifact)

StrUtil:

boolean isEmpty = (str); // String is empty

DateUtil:

String now = (); // Current time（Format：yyyy-MM-dd HH:mm:ss）

IdUtil:

String uuid = (); // generateUUID

4. Java native tool classes

(1) Collections collection operations:

(list);               // Sort(list);            // Reversal

(2) Arrays array operation:

List<String> list = ("a", "b"); // Array TransformationList

(3) Files & Paths (NIO)

File operation:

byte[] bytes = (("")); // Read the file

5. Other high-frequency tools

(1) ValidationUtils (parameter verification)

Package name:

Example:

(errors, "name", ""); // Verification field is not empty

(2) ReflectionUtils (reflection tool)

• Package name:
• Scene: Dynamically call methods and access fields.

(, "getName"); // Find Method

(3) StopWatch (performance monitoring)

Package name:

Example:

StopWatch watch = new StopWatch();
("task1");
// Execute the code...();
(()); // Time-consuming printing

Summary: How to choose a tool class?

Use these tools properlyReduce duplicate code, improve development efficiency. If it is a Spring Boot project, use the tools provided by the Spring ecosystem first (such asStringUtils), and then introduce third-party libraries (such as Hutool) in complex scenarios.

This is the end of this article about commonly used tools and APIs in springboot projects. For more related springboot tool classes and API content, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!