SpringBoot入门学习（三）之BUG

记录学习，不进行正文展示

目录

1、在springboot中配置日期类型转换器 （可直接引用）

2、Autowired与Resource

3、application.properties

1、在springboot中配置日期类型转换器 （可直接引用）

package com.qinluyu.config;
import org.springframework.core.convert.converter.Converter;
import org.springframework.stereotype.Component;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
@Component
public class DateConverterConfig implements Converter {
    private static final List formarts = new ArrayList<>(4);
    static{
        formarts.add("yyyy-MM");
        formarts.add("yyyy-MM-dd");
        formarts.add("yyyy-MM-dd hh:mm");
        formarts.add("yyyy-MM-dd hh:mm:ss");
    }
    @Override public Date convert(String source) {
        String value = source.trim();
        if ("".equals(value)) {
        return null;
    }
        if(source.matches("^\d{4}-\d{1,2}$")){
            return parseDate(source, formarts.get(0));
        }
        else if(source.matches("^\d{4}-\d{1,2}-\d{1,2}$")){
            return parseDate(source, formarts.get(1));
        }
    else if(source.matches("^\d{4}-\d{1,2}-\d{1,2} {1}\d{1,2}:\d{1,2}$")){
        return parseDate(source, formarts.get(2));
    }
    else if(source.matches("^\d{4}-\d{1,2}-\d{1,2} {1}\d{1,2}:\d{1,2}:\d{1,2}$")){
        return parseDate(source, formarts.get(3));
    }
    else {
        throw new IllegalArgumentException("Invalid boolean value '" + source + "'");
    }

    }

    
    public Date parseDate(String dateStr, String format) {
        Date date=null;
        try {
            DateFormat dateFormat = new SimpleDateFormat(format);
            date = dateFormat.parse(dateStr);
        }
        catch (Exception e) {

        }
        return date;
    }
}

2、Autowired与Resource

先看结果

 

区别：

@Autowired 为 Spring 的注解默认是根据 type 进行注入，

@Resource默认按byName自动注入

具体你那个代码为啥用@Resource能行还得看具体原因

3、application.properties

#mybatis 别名扫描
mybatis.type-aliases-package=com.qinluyu.entity
spring.resources.static-locations=classpath:/static/
spring.thymeleaf.prefix=classpath:/templates/
#mapper配置文件
mybatis.mapper-locations=classpath:mybatis/*.xml
#关闭thymeleaf缓存
spring.thymeleaf.cache=false

4、分页测试

@RunWith(SpringRunner.class)
@SpringBootTest
public class BillServiceTest{
    @Resource
    private BillService billService;
    @Test
    public void testListPage() {
        Bill b = new Bill();
        b.setTitle("a");
        PageInfo page = PageHelper.startPage(2, 10).doSelectPageInfo(() -> {
            billService.list(b);
        });
        page.getList().forEach(bill -> {
            System.out.println(bill.getId() + " " + bill.getTitle());
        });
        System.out.println("总行数=" + page.getTotal());
        System.out.println("当前页=" + page.getPageNum());
        System.out.println("每页行数=" + page.getPageSize());
        System.out.println("总页数=" + page.getPages());
        System.out.println("起始行数=" + page.getStartRow());
        System.out.println("是第一页=" + page.isIsFirstPage());
        System.out.println("是最后页=" + page.isIsLastPage());
        System.out.println("还有下一页=" + page.isHasNextPage());
        System.out.println("还有上一页=" + page.isHasPreviousPage());
        System.out.println("页码列表" + Arrays.toString(page.getNavigatepageNums()));
    }
}

            com.github.pagehelper
            pagehelper-spring-boot-starter
            1.2.3