java map的key值转驼峰命名的方法
作者:寒冷的雨呢
这篇文章主要介绍了java map的key值转驼峰,通过实例代码介绍了Map把“_”形式的key转化为驼峰形式,本文通过实例代码给大家介绍的非常详细,需要的朋友可以参考下
java map的key值转驼峰
MPJLambdaWrapper<Entity> wrapper = new MPJLambdaWrapper<Entity>(); baseMapper.selectJoinMaps(wrapper).stream().map(MapUtil::toCamelCaseMap).collect(Collectors.toList());
List<Map<String, Object>> getList(DateAndAreaDto dateAndAreaDto); return Result.success(scaleoperateMapper.getList(dateAndAreaDto) .stream() .map(MapUtil::toCamelCaseMap)
map.stream() .map(MapUtil::toCamelCaseMap) .collect(Collectors.toList())
Java 把map的key转换成驼峰命名
需求:将map里的key转换为驼峰命名,并返回
package com.enation.app.javashop.framework.util; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Map.Entry; /** * map工具类 * * @author * @date 2021/8/31 12:57 */ public class MapUtils { /** * 把map的key转换成驼峰命名 * * @param map * @return map */ public static Map<String, Object> toReplaceKeyLow(Map<String, Object> map) { Map<String, Object> reMap = new HashMap<>(); if (reMap != null) { Iterator var2 = map.entrySet().iterator(); while (var2.hasNext()) { Entry<String, Object> entry = (Entry) var2.next(); reMap.put(underlineToCamel((String) entry.getKey()), map.get(entry.getKey())); } map.clear(); } return reMap; } public static final char UNDERLINE = '_'; public static String underlineToCamel(String param) { if (param == null || "".equals(param.trim())) { return ""; } int len = param.length(); StringBuilder sb = new StringBuilder(len); for (int i = 0; i < len; i++) { char c = param.charAt(i); if (c == UNDERLINE) { if (++i < len) { sb.append(Character.toUpperCase(param.charAt(i))); } } else { sb.append(Character.toLowerCase(param.charAt(i))); } } return sb.toString(); } }
Map把“_”形式的key转化为驼峰形式
常见与数据库获取数据,key为字段名
package com.neusoft.modules.generator.handler; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.text.DecimalFormat; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Map.Entry; import org.apache.commons.lang.StringUtils; /** * map工具类 * * @author * @date 2021/8/31 12:57 */ public class MapUtil { /** * 把map的key转换成驼峰命名 * * @param map * @return map */ public static Map<String, String> toReplaceKeyLow(Map<String, String> map) { if(null == map) return null; Map<String, String> reMap = new HashMap<>(); if (reMap != null) { Iterator var2 = map.entrySet().iterator(); while (var2.hasNext()) { Entry<String, String> entry = (Entry) var2.next(); String value= String.valueOf(map.get(entry.getKey())); if(value.indexOf("0E-")!=-1) { value = "0"; } if(value.equals("null")) { value = ""; } //将小数后面的“0”去掉,保留2位小数 if(validateNumber(value)) { // System.out.println("value = " +value); DecimalFormat decimalFormat = new DecimalFormat("###.##"); // String str = value.substring(0,5); // if (str.equals("0.005")) { // value = "0.01"; // } else { value = decimalFormat.format(Float.valueOf(value).floatValue()); // } } reMap.put(underlineToCamel((String) entry.getKey()),value); } map.clear(); } return reMap; } public static final char UNDERLINE = '_'; public static String underlineToCamel(String param) { if (param == null || "".equals(param.trim())) { return ""; } int len = param.length(); StringBuilder sb = new StringBuilder(len); for (int i = 0; i < len; i++) { char c = param.charAt(i); if (c == UNDERLINE) { if (++i < len) { sb.append(Character.toUpperCase(param.charAt(i))); } } else { sb.append(Character.toLowerCase(param.charAt(i))); } } return sb.toString(); } public static <T> List<T> deepCopy(List<T> src) throws IOException, ClassNotFoundException { ByteArrayOutputStream byteOut = new ByteArrayOutputStream(); ObjectOutputStream out = new ObjectOutputStream(byteOut); out.writeObject(src); ByteArrayInputStream byteIn = new ByteArrayInputStream(byteOut.toByteArray()); ObjectInputStream in = new ObjectInputStream(byteIn); return (List<T>)in.readObject(); } //判断该数据是否为小数形式 private static boolean validateNumber(String str) { if(StringUtils.isBlank(str)||str.indexOf(".")==-1) { return false; } // 说明一下的是该正则只能识别4位小数;如果不限制小数位数的话,写成[+-]?[0-9]+(\\.[0-9]+)?就可以了 return str.matches("[+-]?[0-9]+(\\.[0-9]+)?"); } }
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