类型转换
日期类型转换
date->string
Date now = new Date();String time=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(now)
string->date
String time;Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(time);
Instant->string
Instant startTime;String allotStamp = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(Date.from(startTime));
string->Instant
String t;Instant time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(t).toInstant();
罕用类型转换
list<string> -> list<long>
List<Long> ApparatusIds = ids.stream().map(s -> Long.parseLong(s.trim())).collect(Collectors.toList());
map->string
import org.apache.htrace.shaded.fasterxml.jackson.databind.ObjectMapper; Map<String, Object> contentJson = form.getContent(); if (MapUtils.isNotEmpty(contentJson)) { try { String content = new ObjectMapper().writeValueAsString(contentJson); SOW.setContent(content); } catch (Exception e) { throw new RuntimeException(e.getMessage()); } }
string->map
import com.google.gson.Gson; Map<String, Object> dto = null; try { Gson gson = new Gson(); if (StringUtils.isNotBlank(source.getContent())) { dto = gson.fromJson(source.getContent(), new TypeToken<Map<String, Object>>() {}.getType()); } } catch (JsonSyntaxException e) { throw new RuntimeException("string 转 map 谬误"); }