JDK1.8中的新特性函数接口Consumer以及accept方法的实例使用。
JDK1.8中的新特性函数接口Consumer以及accept方法的实例使用。
举例使用场景：通过定时任务对数据库中的很多表中的某一字段进行自动添加内容。1.首先将不同表的的表名以及该表的标识，其他信息进行每局enum中实例存储配置。2.通过项目启动@PostConstruct提前将具体的统一填充字段内容方法作为一个Consumer填充到一个HashMap中，hashmap中的key为表的唯一标识。3.遍历循环所有的表，通过表标识获取map中的对应表customer行为参数，将表信息传给行为Consumer中的方法，通过行为方法accept执行。
1.多张表enum实例信息
public enum BillTypeEnum {
task_notice("task_notice", "RW", "工程任务通知书", "BO_EU_TASK_NOTICE"),
project_visa("project_visa", "QZ", "工程签证单", "BO_EU_PROJECT_VISA"),
settlement_application("settlement_application", "JS", "工程结算申请单", "BO_EU_SETTLEMENT_APPLICATION"),
record_review("record_review", "HS", "图纸会审记录", "BO_EU_RECORD_REVIEW"),
default_notice("default_notice", "WY", "工程违约通知单", "BO_EU_DEFAULT_NOTICE"),
construction_drawings("construction_drawings", "SG", "施工图纸", "BO_EU_CONSTRUCTION_DRAWINGS"),
contact_list("contact_list", "LX", "工程联系单", "BO_EU_CONTACT_LIST"),
changed_drawings("changed_drawings", "BG", "图纸变更申请", "BO_EU_CHANGED_DRAWINGS"),
visa_apply("visa_apply", "QZS", "工程签证申请单", "BO_EU_VISA_APPLY"),
onsite_measurement("onsite_measurement", "SF", "现场收方计量单", "BO_EU_ONSITE_MEASUREMENT"),
completed_drawings("completed_drawings", "JG", "竣工图纸", "BO_EU_COMPLETED_DRAWINGS"),
user_apply("user_apply", "YHJSSQ", "用户角色申请", "BO_EU_USER_ROLE_APPLY"),
acceptance_completion("acceptance_completion", "JGYS", "工程竣工验收单", "BO_EU_ACCEPTANCE_COMPLETION"),
acceptance_sporadic("acceptance_sporadic", "LXJGYS", "零星工程竣工验收单", "BO_EU_ACCEPTANCE_SPORADIC"),
acceptance_bill("acceptance_bill", "GCYS", "工程验收单", "BO_EU_ACCEPTANCE_BILL"),
acceptance_bill_hide("acceptance_bill_hide", "YBGCYS", "隐蔽工程验收单", "BO_EU_ACCEPTANCE_BILL_HIDE"),
acceptance_bill_proc_hide("acceptance_bill_proc_hide", "GCYBGCYS", "过程隐蔽工程验收单", "BO_EU_ACCEPTANCE_PROC_HIDE"),
project_statement("project_statement", "GCJSS", "工程结算书", "BO_EU_PROJECT_STATEMENT"),
supervision_notice("supervision_notice", "XCJL", "现场监理通知单", "BO_EU_SITE_SUPERVISION_NOTICE"),
construction_report("construction_report", "TJFABS", "土建方案报审", "BO_EU_CONSTRUCTION_REPORT"),
;
private String value;
private String code;
private String name;
private String tablename;
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getTablename() {
return tablename;
}
public void setTablename(String tablename) {
this.tablename = tablename;
}
private BillTypeEnum(String value, String code, String name, String tablename) {
this.value = value;
this.code = code;
this.name = name;
this.tablename = tablename;
}
public static BillTypeEnum getBillTypeEnum(String value) {
BillTypeEnum[] billTypeEnumEnums = values();
for (BillTypeEnum sillTypeEnum : billTypeEnumEnums) {
if (sillTypeEnum.value.equals(value)) {
return sillTypeEnum;
}
}
return null;
}
2.@PostConstruct将具体的统一填充字段内容方法作为一个Consumer填充到一个HashMap中
通过Consumer接收统一的业务处理逻辑方法，将其放入到Map中。
private Map> strategyConditionMap=new HashMap();
@PostConstruct
public void init(){
strategyConditionMap.put("baseBillNo", this::billNoGenerateByProject);
strategyConditionMap.put("acceptance_completion", this::billNoGenerateByCommon);
strategyConditionMap.put("acceptance_sporadic", this::billNoGenerateByCommon);
strategyConditionMap.put("acceptance_bill", this::billNoGenerateByCommon);
strategyConditionMap.put("acceptance_bill_hide", this::billNoGenerateByCommon);
strategyConditionMap.put("acceptance_bill_proc_hide", this::billNoGenerateByCommon);
strategyConditionMap.put("supervision_notice", this::billNoGenerateByCommon);
strategyConditionMap.put("construction_report", this::billNoGenerateByCommon);
}
}
3.循环遍历所有的表，表信息传给Consumer通过行为方法accept执行。
循环遍历所有的表，通过表标识获取map中的对应表Consumer行为参数，将表信息传给行为Consumer中的方法，通过行为方法accept执行。
public int billNoGenerate() {
long time = System.currentTimeMillis();
boolean result = redisClientTemplate.setnx("billNoGenerate",3,String.valueOf(time));
if(!result){
return 0;
}
//b遍历所有的表
for (BillTypeEnum billTypeEnum : EnumSet.allOf(BillTypeEnum.class)) {
try {
String value = billTypeEnum.getValue();
if(value.equals("user_apply")){
continue;
}
//从hashmap中获取对应唯一的表行为Customer
Consumer consumer = strategyConditionMap.get(value);
if(null==consumer){
consumer = strategyConditionMap.get("baseBillNo");
}
//将表信息billTypeEnum传递给consumer，通过accept接收参数，执行对应表行为方法
consumer.accept(billTypeEnum);
} catch (Exception e) {
e.printStackTrace();
}
}
return 0;
}
4.具体业务处理方法,其中JDK1.8中的lambda表达式过滤筛选用相关应用
private void billNoGenerateByCommon(BillTypeEnum billTypeEnum){
List billInfoGenerateDtoList = formQueryMapper.selectBillInfoGenerateDto(billTypeEnum.getTablename());
/** 过滤流程正常结束的数据 **/
List bindIds = billInfoGenerateDtoList
.stream()
.map(BillInfoGenerateDto::getBindid)
.collect(Collectors.toList());
ProcessQueryModel processQueryModel = new ProcessQueryModel();
processQueryModel.setIds(bindIds);
List processInstances = bpmService.processQuery(processQueryModel);
List bindids1 = processInstances
.stream()
.filter(s->s.getControlState().equals("end"))
.map(ProcessInstance::getId)
.collect(Collectors.toList());
for (BillInfoGenerateDto billInfoGenerateDto : billInfoGenerateDtoList) {
if(!bindids1.contains(billInfoGenerateDto.getBindid())){
continue;
}
String dateMonth = DateUtil.getShortDays();
String ncPkOrg = billInfoGenerateDto.getNcPkOrg();
String key = billTypeEnum.getValue()+"_"+ncPkOrg+"_"+dateMonth;
String billNoCnt = redisClientTemplate.get(key);
Long requestNo;
if(StringUtils.isBlank(billNoCnt)){
/**读取数据库获取*/
Date nowDate = new Date();
long cnt=formQueryMapper.selectBillNoCountByNcAndDate(billTypeEnum.getTablename(),ncPkOrg,nowDate);
redisClientTemplate.setnx(key,Constants.EXPIRE_DAY,String.valueOf(cnt));
}
requestNo=redisClientTemplate.incr(key);
NcOrgOrgs ncOrgOrgs = ncOrgOrgsService.getNcOrgOrgsListByPkNcOrg(ncPkOrg);
if(null==ncOrgOrgs){
continue;
}
String mark = ncOrgOrgs.getMark();
if(StringUtils.isBlank(mark)){
continue;
}
DecimalFormat df3 = new DecimalFormat("00000");
String billNo = billTypeEnum.getCode()+mark+dateMonth+df3.format(requestNo);
bpmService.boFieldUpdate(billTypeEnum.getTablename(), billInfoGenerateDto.getBindid(), "BILL_NO", billNo);
}
}
在以后的java开发中函数编程会更加的广泛，简化程序开发，参数传递的可以是具体的方法，这种行为可以简单称为函数行为。以上是个人方法的使用以及相关见解。