List<String>转换成List<xxxDo>




import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

public class business {
    public static class overhaulTaskDo{
        private String isolation;

        public String getIsolation() {
            return isolation;
        }

        public void setIsolation(String isolation) {
            this.isolation = isolation;
        }

        @Override
        public boolean equals(Object o) {
            if (o == null || getClass() != o.getClass()) return false;
            overhaulTaskDo that = (overhaulTaskDo) o;
            return Objects.equals(isolation, that.isolation);
        }

        @Override
        public int hashCode() {
            return Objects.hashCode(isolation);
        }

        public overhaulTaskDo() {
            this.isolation = isolation;
        }

        @Override
        public String toString() {
            return "overhaulTaskDo{" +
                    "isolation='" + isolation + '\'' +
                    '}';
        }
    }
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("1");
        list.add("2");
        List<overhaulTaskDo> isoList = new ArrayList<>();
        //isoList如何转换成list
        // isoList.add((List<overhaulTaskDo>) list);
        System.out.println("list:{}" + list);
//方法1: 循环遍历取值,再处理转换数据(成功)
        for (int i = 0; i < list.size(); i++) {
            overhaulTaskDo overhaulTaskDo = new overhaulTaskDo();
            overhaulTaskDo.setIsolation(list.get(i));
            isoList.add(overhaulTaskDo);
        }
        System.out.printf("isoList:{}"+isoList);
    }
//方法二:用hutool工具类转换(失败)
//        JSONArray jsonArray = JSONUtil.parseArray(list);
//        System.out.println("jsonArray:{}" + jsonArray);
//        List<overhaulTaskDo> listVOS = JSONUtil.toList(jsonArray, overhaulTaskDo.class);
//        System.out.println("listVOS:" + listVOS);
//。  方法三:使用stream流转换(失败)
//        List<overhaulTaskDo> entityList = isoList.stream()
//                // 这里使用Lambda表达式进行强制类型转换,确保元素能转换为YourEntityClass类型
//                .map(obj -> (overhaulTaskDo) obj)
//                .collect(Collectors.toList());
//        System.out.println("entityList:{}" + entityList);
//       }
}

记录帖:记录一下List<Object>转换成List<xxxDo>的样式的办法,只有方法一成功了,方法二三都失败了。待完善

org.mybatis.spring.MyBatisSystemException: null at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:97) ~[mybatis-spring-3.0.3.jar:3.0.3] at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:439) ~[mybatis-spring-3.0.3.jar:3.0.3] at jdk.proxy2/jdk.proxy2.$Proxy82.selectList(Unknown Source) ~[na:na] at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:224) ~[mybatis-spring-3.0.3.jar:3.0.3] at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.executeForIPage(MybatisMapperMethod.java:119) ~[mybatis-plus-core-3.5.7.jar:3.5.7] at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.execute(MybatisMapperMethod.java:84) ~[mybatis-plus-core-3.5.7.jar:3.5.7] at com.baomidou.mybatisplus.core.override.MybatisMapperProxy$PlainMethodInvoker.invoke(MybatisMapperProxy.java:152) ~[mybatis-plus-core-3.5.7.jar:3.5.7] at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:89) ~[mybatis-plus-core-3.5.7.jar:3.5.7] at jdk.proxy2/jdk.proxy2.$Proxy130.findZeroValueRecords(Unknown Source) ~[na:na] at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[na:na] at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[na:na] at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343) ~[spring-aop-6.0.13.jar:6.0.13] at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:196) ~[spring-aop-6.0.13.jar:6.0.13] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-6.0.13.jar:6.0.13] at com.baomidou.dynamic.datasource.aop.DynamicDataSourceAnnotationInterceptor.invoke(DynamicDataSourceAnnotationInterceptor.java:57) ~[dynamic-datasource-spring-4.3.0.jar:na] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.0.13.jar:6.0 int offset = 0; int size = 1000; List<ElectricityDataHis> list = new ArrayList<>(); IPage<ElectricityDataHis> records; do { Page<ElectricityDataHis> pages = new Page<>(offset, size); // 第1页,每页10条 records = hisService.findZeroValueRecords(pages); records.getRecords().stream().forEach(record->{ // 获取前一个有效值 ElectricityDataHis lastValid = hisService.findLastValidBeforeTime( record.getTagId(), record.getRecordTime() ); if (lastValid != null) { // 生成修正后的新记录 record.setRecordValue(lastValid.getRecordValue()); record.setStatus(2);// 标记为已修正 // 写入修正记录(保留原始记录) list.add(record); } }); hisService.fixAllData(list); list.clear(); offset++; } while (! records.getRecords().isEmpty()); }
03-08
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值