MapStruct

MapStruct - Java bean mappings, the easy way!

Java Bean之间的映射器，通过接口定义自动完成转换类的实现，解放双手

public class Car {
 
    private String make;
    private int numberOfSeats;
    private CarType type;
 
    //constructor, getters, setters etc.
}

public class CarDto {
 
    private String make;
    private int seatCount;
    private String type;
 
    //constructor, getters, setters etc.
}

@Mapper 
public interface CarMapper {
 
    CarMapper INSTANCE = Mappers.getMapper( CarMapper.class ); 
 
		//map for field that in differrent name.
    @Mapping(source = "numberOfSeats", target = "seatCount") 
		
    CarDto carToCarDto(Car car); 
}

QueryDSL

Querydsl - Unified Queries for Java

基于Java8的复杂数据库查询，采用Java链式调用实现了类似于SQL查询的语句。

Guava

google/guava

著名的Java工具类

Guava is a set of core Java libraries from Google that includes new collection types (such as multimap and multiset), immutable collections, a graph library, and utilities for concurrency, I/O, hashing, caching, primitives, strings, and more! It is widely used on most Java projects within Google, and widely used by many other companies as well.

除了让Java用起来更愉悦的基础工具类以外，还有集合、图、缓存、函数式编程、字符串、Java不支持的原始类型、范围、I/O、哈希、事件总线、反射、数学等多个模块。可以按需使用

Swagger

API Documentation & Design Tools for Teams | Swagger

API查看神器。支持API浏览、查看入参出参、测试等。

• Mockito

Mockito framework site

Java的Mock资源库。使用when()、then()、verify()等方法可以很快速地mock和验证返回值。