本文實例為大家分享了java實現省市區轉換成樹形結構的具體代碼，供大家參考，具體內容如下
前言：為什我想寫這篇博客呢？第一方面是記錄，另一方面是分享。
1.創建數據庫表
1.建表語句
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
CREATE TABLE `area` ( `AREA_CODE` varchar(16) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '區域ID', `AREA_NAME` varchar(512) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '區域名稱', `SUPERIOR_CODE` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '父級代碼', `AREA_LEVEL` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '級別', `AREA_SORT` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '排序', `REMARK` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '備注', `DELETE_FLAG` varchar(1) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '刪除標識', `CREATED_BY` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '創建人', `CREATION_TIME` timestamp(0) NOT NULL DEFAULT CURRENT_TIMESTAMP(0) ON UPDATE CURRENT_TIMESTAMP(0) COMMENT '創建時間', `UPDATED_BY` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '更新人', `UPDATE_TIME` timestamp(0) NOT NULL DEFAULT '2020-01-01 00:00:00' COMMENT '更新時間', PRIMARY KEY (`AREA_CODE`) USING BTREE, UNIQUE INDEX `UK_T_PUB_AREA_AREA_CODE`(`AREA_CODE`) USING BTREE, INDEX `IDX_T_PUB_AREA_AREA_LEVEL`(`AREA_LEVEL`) USING BTREE, INDEX `IDX_T_PUB_AREA_SUPERIOR_CODE`(`SUPERIOR_CODE`) USING BTREE) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '區域表' ROW_FORMAT = DYNAMIC;SET FOREIGN_KEY_CHECKS = 1; |
建表完成的table樣式：
2.創建java實體
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
package org.labib.pojo;import java.util.Date;public class Area { //區域ID private String areaCode; //區域名稱 private String areaName; //父級代碼 private String superiorCode; //級別 private String areaLevel; //排序 private String areaSort; //備注 private String remark; //刪除標識 private String deleteFlag; //創建人 private String createdBy; //創建時間 private Date creationTime; //更新人 private String updatedBy; //更新時間 private Date updateTime; public String getAreaCode() { return areaCode; } public void setAreaCode(String areaCode) { this.areaCode = areaCode == null ? null : areaCode.trim(); } public String getAreaName() { return areaName; } public void setAreaName(String areaName) { this.areaName = areaName == null ? null : areaName.trim(); } public String getSuperiorCode() { return superiorCode; } public void setSuperiorCode(String superiorCode) { this.superiorCode = superiorCode == null ? null : superiorCode.trim(); } public String getAreaLevel() { return areaLevel; } public void setAreaLevel(String areaLevel) { this.areaLevel = areaLevel == null ? null : areaLevel.trim(); } public String getAreaSort() { return areaSort; } public void setAreaSort(String areaSort) { this.areaSort = areaSort == null ? null : areaSort.trim(); } public String getRemark() { return remark; } public void setRemark(String remark) { this.remark = remark == null ? null : remark.trim(); } public String getDeleteFlag() { return deleteFlag; } public void setDeleteFlag(String deleteFlag) { this.deleteFlag = deleteFlag == null ? null : deleteFlag.trim(); } public String getCreatedBy() { return createdBy; } public void setCreatedBy(String createdBy) { this.createdBy = createdBy == null ? null : createdBy.trim(); } public Date getCreationTime() { return creationTime; } public void setCreationTime(Date creationTime) { this.creationTime = creationTime; } public String getUpdatedBy() { return updatedBy; } public void setUpdatedBy(String updatedBy) { this.updatedBy = updatedBy == null ? null : updatedBy.trim(); } public Date getUpdateTime() { return updateTime; } public void setUpdateTime(Date updateTime) { this.updateTime = updateTime; }} |
3.創建mapper
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
package org.labib.mapper;import org.labib.pojo.Area;import java.util.List;import java.util.Map;public interface AreaMapper { int deleteByPrimaryKey(String areaCode); int insert(Area record); int insertSelective(Area record); Area selectByPrimaryKey(String areaCode); int updateByPrimaryKeySelective(Area record); int updateByPrimaryKey(Area record); List<Area> queryAreaAll(); List<Map<String, String>> queryMap();} |
4.創建service
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
|
@Service("AreaService")public class AreaService { @Autowired private AreaMapper areaMapper; //修建 public String queryArea(){ List<Area> mapList = areaMapper.queryAreaAll(); JSONArray result = ListToTree.buildTree(JSONArray.parseArray(JSON.toJSONString(mapList)),"areaCode","superiorCode","children"); return result.toJSONString(); } //修建 public String queryAreaCode(){ List<Map<String, String>> mapList = areaMapper.queryMap(); JSONArray result = ListToTree.buildTree(JSONArray.parseArray(JSON.toJSONString(mapList)),"value","superiorCode","children"); return result.toJSONString(); }} |
并附上轉換成樹形結構的工具類：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
public class ListToTree { public static JSONArray buildTree(JSONArray arr, String id, String pid, String Chirden) { //新建一個JSONArray來接收組裝成樹形結構的返回值 JSONArray jsonArray = new JSONArray(); //新建一個JSONObject對象 JSONObject hash = new JSONObject(); //將數組轉換為object格式 for (int i = 0; i < arr.size(); i++) { //獲取當前的JSON對象 JSONObject json = (JSONObject) arr.get(i); //把當前id作為鍵，當前JSON對象作為值 put回hash這個Object對象中 //這里的put方法類似于map的put方法 hash.put(json.getString(id), json); } //遍歷結果集 for (int j = 0; j < arr.size(); j++) { //單條記錄 JSONObject aVal = (JSONObject) arr.get(j); //在hash中取出key為單條記錄中pid的值 String pidStr = ""; //如果父級id不等于null if (aVal.get(pid) != null) { pidStr = aVal.get(pid).toString(); } //從hash這個對象中獲取父級對象 parent JSONObject hashParent = (JSONObject) hash.get(pidStr); //如果記錄的pid存在，則說明它有父節點，將她添加到孩子節點的集合中 if (hashParent != null) { //檢查是否有child屬性 if (hashParent.get(Chirden) != null) { //有子節點 則先將子節點取出 JSONArray children = (JSONArray) hashParent.get(Chirden); //然后把當前這個對象放進子節點之中 children.add(aVal); //最后把子節點在放回父節點之中 hashParent.put(Chirden, children); } else { //無子節點 則新建一個子節點 JSONArray children = new JSONArray(); //然后再把當前對象放進去 children.add(aVal); //最后在放回父節點之中 hashParent.put(Chirden, children); } } else { jsonArray.add(aVal); } } return jsonArray; }} |
5.創建controller
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
@RestControllerpublic class AreaController { @Resource private AreaService areaService; @RequestMapping(value = "/area",method = RequestMethod.POST) public String queryArea() { return areaService.queryArea(); } @RequestMapping(value = "/area1",method = RequestMethod.POST) public String queryAreaDemo() { return areaService.queryAreaCode(); }} |
6.接口測試
測試結果：
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/qq_45256805/article/details/119565617
