ConvertUtil.java
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package com.bsth.util;
import com.google.common.collect.ArrayListMultimap;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Field;
import java.util.*;
/**
* 数据转换
* Created by panzhao on 2017/3/13.
*/
public class ConvertUtil<T> {
Logger logger = LoggerFactory.getLogger(this.getClass());
private static DateTimeFormatter fmtyyyyMMdd = DateTimeFormat.forPattern("yyyyMMdd");
/**
* 根据指定字段 将 list 分组
*
* @param list
* @param separator 字段使用分隔符连接 组成key
* @param fields
* @return
*/
public ArrayListMultimap<String, T> groupMultiList(List<T> list, String separator, Field... fields) {
ArrayListMultimap<String, T> multimap = ArrayListMultimap.create();
String key;
//Object field;
try {
for (T t : list) {
key = "";
for (Field f : fields) {
f.setAccessible(true);
//日期类型格式化为 YYYY-MM-DD
if (f.getType().equals(Date.class))
key += (separator + fmtyyyyMMdd.print(((Date) f.get(t)).getTime()));
else
key += (separator + f.get(t).toString());
}
key = key.substring(1);
multimap.put(key, t);
}
} catch (Exception e) {
logger.error("", e);
}
return multimap;
}
/**
* 根据指定字段 将 list 分组
*
* @param list
* @param separator 字段使用分隔符连接 组成key
* @param fields
* @return
*/
public Map<String, T> groupList(List<T> list, String separator, Field... fields) {
Map<String, T> map = new HashMap<>();
String key;
//Object field;
try {
for (T t : list) {
key = "";
for (Field f : fields) {
f.setAccessible(true);
//日期类型格式化为 YYYY-MM-DD
if (f.getType().equals(Date.class))
key += (separator + fmtyyyyMMdd.print(((Date) f.get(t)).getTime()));
else
key += (separator + f.get(t).toString());
}
key = key.substring(1);
map.put(key, t);
}
} catch (Exception e) {
logger.error("", e);
}
return map;
}
/**
* 计算并集
*
* @param all
* @param sub
* @return
*/
public List<String> calcUnion(Collection<String> all, Collection<String> sub) {
List<String> rs = new ArrayList<>();
for (String str : all) {
if (sub.contains(str))
rs.add(str);
}
return rs;
}
/**
* 计算补集
*
* @param all
* @param sub
* @return
*/
public List<String> calcComplement(Collection<String> all, Collection<String> sub) {
List<String> rs = new ArrayList<>();
for (String str : all) {
if (!sub.contains(str))
rs.add(str);
}
return rs;
}
}