关于lombok包（可使编程便捷）的一些使用

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

package com.yzy.sell.Entity;

import lombok.Data;
import org.hibernate.annotations.DynamicUpdate;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity   //申明是个pojo对象
@DynamicUpdate    //动态更新，
@Data            //引入lombok包，可自动生成getter/setter/toString等方法
public class ProductCategory {
    @Id         //设置主键
    @GeneratedValue(strategy = GenerationType.IDENTITY)     //自增属性，strategy表示自增策略
    private Integer categoryId;
    private String categoryName;
    private Integer categoryType;

    public ProductCategory() {
    }

    public ProductCategory(String categoryName,Integer categoryType){
        this.categoryName=categoryName;
        this.categoryType=categoryType;
    }
}

package com.yzy.sell;
import lombok.extern.slf4j.Slf4j;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;


@RunWith (SpringRunner.class)
@SpringBootTest
@Slf4j
public class SellApplicationTests {
//  private final Logger log= LoggerFactory.getLogger(SellApplicationTests.class);    使用了@Slf4j相当于生成了此对象
    @Test
    public void test1() {
        String name = "yzy";
        String password = "123456";
        log.debug("debug...");
        log.info("name: " + name + " ,password: " + password);
        log.info("name: {}, password: {}", name, password);
        log.error("error...");
        log.warn("warn...");
    }
}