本篇文章为你整理了Java一次返回中国所有省市区三级树形级联+前端vue展示【200ms内】()的详细内容,包含有 Java一次返回中国所有省市区三级树形级联+前端vue展示【200ms内】,希望能帮助你了解 Java一次返回中国所有省市区三级树形级联+前端vue展示【200ms内】。
中国省市区还是不少的,省有34个,市有391个,区有1101个,这是以小编的库里的,可能不是最新的,但是个数也差不了多少。
当一次返回所有的数据,并且还要组装成一个三级树,一般的for,会循环34*391*1101次。这样就是千万级的,加上与数据库交互,你跑半天也跑不完。
最后的处理是组长提供的思路,果然很快。
首先:小编的省市区是三张表
第一:我们通过三次IO从数据库中查询出所有省市区的数据,下面在进行for循环组装树形效率就很快了!
第二:为了减少IO交互,我们把刚刚取出来的市和区构建为map provinceCode,List City ,map districtCode,List District ,这样效率就上来了!
三、数据库表设计
CREATE TABLE `address_province` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT ID,
`code` char(6) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`name` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`short_name` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`new_code` char(6) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`is_latest` tinyint(3) NULL DEFAULT 1 COMMENT 是否是最新地址,0否1是,
`remarks` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`created_at` datetime(0) NULL DEFAULT NULL COMMENT 创建时间,
`created_by` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`updated_at` datetime(0) NULL DEFAULT NULL COMMENT 更新时间,
`updated_by` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`is_deleted` tinyint(3) UNSIGNED NOT NULL DEFAULT 0 COMMENT 删除标记,0:正常;1:删除,
PRIMARY KEY (`id`) USING BTREE,
UNIQUE INDEX `uk_code`(`code`) USING BTREE,
INDEX `idx_address_province_name`(`name`) USING BTREE,
INDEX `idx_address_province_short_name`(`short_name`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 35 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = 地址省 ROW_FORMAT = Dynamic;
2. 市:
CREATE TABLE `address_city` (
`id` int(11) UNSIGNED NOT NULL AUTO_INCREMENT COMMENT ID,
`code` char(6) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`name` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`new_code` char(6) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`province_code` char(6) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`is_latest` tinyint(3) NULL DEFAULT 1 COMMENT 是否是最新地址,0否1是,
`remarks` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`created_at` datetime(0) NULL DEFAULT NULL COMMENT 创建时间,
`created_by` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`updated_at` datetime(0) NULL DEFAULT NULL COMMENT 更新时间,
`updated_by` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`is_deleted` tinyint(3) NULL DEFAULT 0 COMMENT 删除标记,0正常1删除,
PRIMARY KEY (`id`) USING BTREE,
UNIQUE INDEX `uk_code`(`code`) USING BTREE,
INDEX `idx_address_city_name`(`name`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 392 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = 地址市 ROW_FORMAT = Dynamic;
CREATE TABLE `address_district` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`code` char(6) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`name` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`new_code` char(6) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`city_code` char(6) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`province_code` char(6) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`is_latest` tinyint(3) NULL DEFAULT 1 COMMENT 是否是最新地址,0否1是,
`remarks` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`created_at` datetime(0) NULL DEFAULT NULL COMMENT 创建时间,
`created_by` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`updated_at` datetime(0) NULL DEFAULT NULL COMMENT 更新时间,
`updated_by` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`is_deleted` tinyint(3) NULL DEFAULT 0 COMMENT 删除标记,0正常1删除,
PRIMARY KEY (`id`) USING BTREE,
UNIQUE INDEX `uk_code`(`code`) USING BTREE,
INDEX `idx_address_district_name`(`name`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 3110 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = 地址县/区 ROW_FORMAT = Dynamic;
数据量太大了,就不给大家了!
四、具体实现
省市区的实体类就不展示了,大家根据自己公司的设计稍微改动即可使用!
1. 树形VO
/**
* 地址业务父子
* @author wangzhenjun
* @date 2022/9/2 16:26
@Data
public class AddressVO implements Serializable {
* ID
@ApiModelProperty(value = "ID")
private Integer id;
* 编码
@ApiModelProperty(value = "")
private String code;
* 名称
@ApiModelProperty(value = "")
private String name;
* 父编码
private String parentCode;
* 市区
private List AddressVO children;
2. 具体实现
@Override
public Result address() {
long l = System.currentTimeMillis();
// 获取省市区
List AddressProvince provinceList = addressProvinceMapper.selectList(Wrappers. AddressProvince lambdaQuery().eq(AddressProvince::getIsDeleted, 0).eq(AddressProvince::getIsLatest, 1));
List AddressCity cityList = addressCityMapper.selectList(Wrappers. AddressCity lambdaQuery().eq(AddressCity::getIsDeleted, 0).eq(AddressCity::getIsLatest, 1));
List AddressDistrict districtList = addressDistrictMapper.selectList(Wrappers. AddressDistrict lambdaQuery().eq(AddressDistrict::getIsDeleted, 0).eq(AddressDistrict::getIsLatest, 1));
// 按照省code进行分组
Map String, List AddressCity cityMap = cityList.stream().collect(Collectors.groupingBy(AddressCity::getProvinceCode));
// 按照市code进行分组
Map String, List AddressDistrict districtMap = districtList.stream().collect(Collectors.groupingBy(AddressDistrict::getCityCode));
List AddressVO result = new ArrayList ();
for (AddressProvince province : provinceList) {
// 获取某个省下的所有市
List AddressCity addressCityList = cityMap.get(province.getCode());
// 给树形对象赋省的数据
AddressVO addressProvinceVO = new AddressVO();
addressProvinceVO.setId(province.getId());
addressProvinceVO.setCode(province.getCode());
addressProvinceVO.setName(province.getName());
List AddressVO cityResult = new ArrayList ();
for (AddressCity addressCity : addressCityList) {
// 获取某个市下的所有区
List AddressDistrict addressDistrictList = districtMap.get(addressCity.getCode());
// 给树形对象赋市的数据
AddressVO addressCityVO = new AddressVO();
addressCityVO.setId(addressCity.getId());
addressCityVO.setCode(addressCity.getCode());
addressCityVO.setName(addressCity.getName());
addressCityVO.setParentCode(province.getCode());
List AddressVO districtResult = new ArrayList ();
// 便利每个市下面的所有区
for (AddressDistrict addressDistrict : addressDistrictList) {
// 给树形对象赋区的数据
AddressVO addressDistrictVO = new AddressVO();
addressDistrictVO.setId(addressDistrict.getId());
addressDistrictVO.setCode(addressDistrict.getCode());
addressDistrictVO.setName(addressDistrict.getName());
addressDistrictVO.setParentCode(addressCity.getCode());
districtResult.add(addressDistrictVO);
addressCityVO.setChildren(districtResult);
cityResult.add(addressCityVO);
addressProvinceVO.setChildren(cityResult);
result.add(addressProvinceVO);
System.out.println(System.currentTimeMillis() - l);
return Result.success(result);
4. 计算时长
我们可以看到,一共297毫秒,小编的机器比较卡,支持cpu在60%情况下,200ms应该问题不大,可以放到redis缓存起来,这样减少IO交互,减少数据库的压力!!
五、前端vue
此时address为数组,按序放了选择的value,
props:可以指定显示和选择的名称,默认是value和label
el-cascader
v-model="addReceiverForm.address"
placeholder="请选择收货人地址"
:options="options"
:props="{checkStrictly: true,value:code,label:name}" /el-cascader
========data:============
addReceiverForm:{
address:[]
options: [],
========method:============
// 获取省市区
initAddress() {
listAddressAndChild().then(data = {
this.options = data.data
}).catch(() = {
如果大家有比小编更加快的方式,欢迎留言交流哈!
如果觉得有用,还请动动大家的发财小手点点关注哈!!谢谢大家了!!
有缘人才可以看得到的哦!!!
欢迎大家关注小编的微信公众号,谢谢大家!
点击访问!小编自己的网站,里面也是有很多好的文章哦!
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