今天接了一个需求，前端代码传一个入参，java后端返回该入参和该入参对应的表头的一部分，比如前段传入一个入参为$2GSiteId，我们返回$2GSiteId对应的数据和2G：
①定义一个So类，定义入参变量

private String $2GSiteId;public String get$2GSiteId() {return $2GSiteId;
}public void set$2GSiteId(String $2GSiteId) {this.$2GSiteId = $2GSiteId;
}

②在业务层代码中新建map集合，使用jdk8新特性返回所需的数据

Map<String, Object> map = new HashMap<String, Object>();List<String> enbCode = new ArrayList<>();if (!StringUtils.isEmpty(so.get$2GSiteId())) {List<String> finalEnbCode = enbCode;Arrays.stream(so.get$2GSiteId().split(",")).forEach(key -> {map.put(key,"2G");finalEnbCode.add(key);});}if (!StringUtils.isEmpty(so.get$4GSiteId())) List<String> finalEnbCode = enbCode;Arrays.stream(so.get$4GSiteId().split(",")).forEach(key -> {map.put(key,"4G");finalEnbCode.add(key);});}if (!StringUtils.isEmpty(so.get$5GSiteId())) {List<String> finalEnbCode = enbCode;Arrays.stream(so.get$5GSiteId().split(",")).forEach(key -> {map.put(key,"5G");finalEnbCode.add(key);});}String unit = StringUtils.strip(enbCode.toString(), "[]");String strEnbCode = unit.replace(",","','").replace(" ", "");

③ 在返回实体类中新建一个返回对应2G数据的变量type

private String type;public String getType() {return type;
}public void setType(String type) {this.type = type;
}

④ 在业务层调用该变量type

TestDto testDto = new TestDto();
testDto.setType(map.get(alarmCorrelationDto.getSiteId()).toString());