sql查询List通过反射转实体类 使用Json格式化工具类

• • sql查询listmap集合通过反射转实体类
  • 使用Json格式化工具类

List> catalogHisEntityList = dscCatalogDao.getDscCatalogSyncEntities();
List modelList = catalogHisEntityList.stream()
        .map(mapResult -> (ImpInfoModel) TransBeanUtil.transObjectWithUnderLineMapKey(mapResult,
                ImpInfoModel.class)).collect(Collectors.toList());




package com.dtdream.cascade.util.common;

import java.lang.reflect.Field;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;

@Slf4j
public class TransBeanUtil {

    private static Pattern humpPattern = Pattern.compile("[A-Z]");


    
    public static Object transObject(Map map, Class clazz) {
        Object entity = null;
        try {
            entity = clazz.newInstance();
        } catch (Exception e) {
            return null;
        }
        Field[] fields = entity.getClass().getDeclaredFields();
        for (Field field : fields) {
            // 属性名
            String name = field.getName();
            // 属性类型 Integer Long Date String int long boolean
            String typeName = field.getType().getSimpleName();
            field.setAccessible(true);
            try {
                if ("Integer".equalsIgnoreCase(typeName)) {
                    Object value = map.get(name);
                    if (value != null && StringUtils.isNotEmpty(value.toString())) {
                        field.set(entity, Integer.valueOf(value.toString()));
                    }
                } else if ("Long".equalsIgnoreCase(typeName)) {
                    Object value = map.get(name);
                    if (value != null && StringUtils.isNotEmpty(value.toString())) {
                        field.set(entity, Long.valueOf(value.toString()));
                    }
                } else if ("String".equalsIgnoreCase(typeName)) {
                    Object value = map.get(name);
                    if (value != null && StringUtils.isNotEmpty(value.toString())) {
                        field.set(entity, String.valueOf(value));
                    }
                } else if ("Date".equalsIgnoreCase(typeName)) {
                    Object value = map.get(name);
                    if (value != null && StringUtils.isNotEmpty(value.toString())) {
                        field.set(entity, DXPTime.convertDate(value.toString()));
                    }
                } else if ("Float".equalsIgnoreCase(typeName)) {
                    Object value = map.get(name);
                    if (value != null && StringUtils.isNotEmpty(value.toString())) {
                        field.set(entity, Float.valueOf(value.toString()));
                    }
                }
            } catch (Exception e) {
                log.info("method [transObject] trans type exception: ", e);
            }
        }
        return entity;
    }


    
    public static Object transObjectWithUnderLineMapKey(Map map, Class clazz) {
        Object entity = null;
        try {
            entity = clazz.newInstance();
        } catch (Exception e) {
            return null;
        }
        Field[] fields = entity.getClass().getDeclaredFields();
        for (Field field : fields) {
            // 属性名
            String name0 = field.getName();
            String name = humpToLine(name0);

            // 属性类型 Integer Long Date String int long boolean
            String typeName = field.getType().getSimpleName();
            field.setAccessible(true);
            try {
                if ("Integer".equalsIgnoreCase(typeName)) {
                    Object value = map.get(name);
                    if (value == null) {
                        value = map.get(name0);
                    }
                    if (value != null && StringUtils.isNotEmpty(value.toString())) {
                        field.set(entity, Integer.valueOf(value.toString()));
                    }
                } else if ("Long".equalsIgnoreCase(typeName)) {
                    Object value = map.get(name);
                    if (value == null) {
                        value = map.get(name0);
                    }
                    if (value != null && StringUtils.isNotEmpty(value.toString())) {
                        field.set(entity, Long.valueOf(value.toString()));
                    }
                } else if ("String".equalsIgnoreCase(typeName)) {
                    Object value = map.get(name);
                    if (value == null) {
                        value = map.get(name0);
                    }
                    if (value != null && StringUtils.isNotEmpty(value.toString())) {
                        field.set(entity, String.valueOf(value));
                    }
                } else if ("Date".equalsIgnoreCase(typeName)) {
                    Object value = map.get(name);
                    if (value == null) {
                        value = map.get(name0);
                    }
                    if (value != null && StringUtils.isNotEmpty(value.toString())) {
                        field.set(entity, DXPTime.convertDate(value.toString()));
                    }
                } else if ("Float".equalsIgnoreCase(typeName)) {
                    Object value = map.get(name);
                    if (value == null) {
                        value = map.get(name0);
                    }
                    if (value != null && StringUtils.isNotEmpty(value.toString())) {
                        field.set(entity, Float.valueOf(value.toString()));
                    }
                }
            } catch (Exception e) {
                log.info("method [transObjectWithUnderLineMapKey] trans type exception: ", e);
            }
        }
        return entity;
    }


    
    public static String humpToLine(String str) {
        Matcher matcher = humpPattern.matcher(str);
        StringBuffer sb = new StringBuffer();
        while (matcher.find()) {
            matcher.appendReplacement(sb, "_" + matcher.group(0).toLowerCase());
        }
        matcher.appendTail(sb);
        return sb.toString();
    }
}

public static void main(String[] args)   {
            Map hashMap = new HashMap<>();
            hashMap.put("field1", "value1");
            hashMap.put("field2", "value2");
            hashMap.put("field3", "value3");
            hashMap.put("field4", "value4");
            hashMap.put("field5", "value5");
 
            //将HashMap转为JSON，在转为Pojo01对象：
            String toJSON = JSONObject.toJSONString(hashMap);
            Pojo01 pojo01 = JSONObject.toJavaObject(JSON.parseObject(toJSON), Pojo01.class);
            System.out.println(" pojo01 = " + pojo01.toString());
      }
      ```