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JAVA 根据数据库表内容生产树结构JSON数据的实例代码

2017-3-7 12:50| 发布者: zhangjf| 查看: 1388| 评论: 0

摘要: 1、利用场景 　　组织机构树，通常会有组织机构表，其中有code(代码),pcode(上级代码),name(组织名称)等字段 2、构造数据（以下数据并不是组织机构数据，而纯属本人胡编乱造的数据） ListTreeTest trees = new Array ...

1、利用场景

　　组织机构树，通常会有组织机构表，其中有code(代码),pcode(上级代码),name(组织名称)等字段

2、构造数据（以下数据并不是组织机构数据，而纯属本人胡编乱造的数据）

  2. List<Tree<Test>> trees = new ArrayList<Tree<Test>>();
  3. tests.add(new Test("0", "", "关于本人"));
  4. tests.add(new Test("1", "0", "技术学习"));
  5. tests.add(new Test("2", "0", "兴趣"));
  6. tests.add(new Test("3", "1", "JAVA"));
  7. tests.add(new Test("4", "1", "oracle"));
  8. tests.add(new Test("5", "1", "spring"));
  9. tests.add(new Test("6", "1", "springmvc"));
  10. tests.add(new Test("7", "1", "fastdfs"));
  11. tests.add(new Test("8", "1", "linux"));
  12. tests.add(new Test("9", "2", "骑行"));
  13. tests.add(new Test("10", "2", "吃喝玩乐"));
  14. tests.add(new Test("11", "2", "学习"));
  15. tests.add(new Test("12", "3", "String"));
  16. tests.add(new Test("13", "4", "sql"));
  17. tests.add(new Test("14", "5", "ioc"));
  18. tests.add(new Test("15", "5", "aop"));
  19. tests.add(new Test("16", "1", "等等"));
  20. tests.add(new Test("17", "2", "等等"));
  21. tests.add(new Test("18", "3", "等等"));
  22. tests.add(new Test("19", "4", "等等"));
  23. tests.add(new Test("20", "5", "等等"));
复制代码

3、源码

Tree.java

  2. package pers.kangxu.datautils.bean.tree;
  3. import java.util.ArrayList;
  4. import java.util.List;
  5. import java.util.Map;
  6. import com.alibaba.fastjson.JSON;
  7. /**
  8. * tree TODO <br>
  9. *
  10. * @author kangxu2 2017-1-7
  11. *
  12. */
  13. public class Tree<T> {
  14. /**
  15. * 节点ID
  16. */
  17. private String id;
  18. /**
  19. * 显示节点文本
  20. */
  21. private String text;
  22. /**
  23. * 节点状态，open closed
  24. */
  25. private String state = "open";
  26. /**
  27. * 节点是否被选中 true false
  28. */
  29. private boolean checked = false;
  30. /**
  31. * 节点属性
  32. */
  33. private List<Map<String, Object>> attributes;
  34. /**
  35. * 节点的子节点
  36. */
  37. private List<Tree<T>> children = new ArrayList<Tree<T>>();
  38. /**
  39. * 父ID
  40. */
  41. private String parentId;
  42. /**
  43. * 是否有父节点
  44. */
  45. private boolean isParent = false;
  46. /**
  47. * 是否有子节点
  48. */
  49. private boolean isChildren = false;
  50. public String getId() {
  51. return id;
  52. }
  53. public void setId(String id) {
  54. this.id = id;
  55. }
  56. public String getText() {
  57. return text;
  58. }
  59. public void setText(String text) {
  60. this.text = text;
  61. }
  62. public String getState() {
  63. return state;
  64. }
  65. public void setState(String state) {
  66. this.state = state;
  67. }
  68. public boolean isChecked() {
  69. return checked;
  70. }
  71. public void setChecked(boolean checked) {
  72. this.checked = checked;
  73. }
  74. public List<Map<String, Object>> getAttributes() {
  75. return attributes;
  76. }
  77. public void setAttributes(List<Map<String, Object>> attributes) {
  78. this.attributes = attributes;
  79. }
  80. public List<Tree<T>> getChildren() {
  81. return children;
  82. }
  83. public void setChildren(List<Tree<T>> children) {
  84. this.children = children;
  85. }
  86. public boolean isParent() {
  87. return isParent;
  88. }
  89. public void setParent(boolean isParent) {
  90. this.isParent = isParent;
  91. }
  92. public boolean isChildren() {
  93. return isChildren;
  94. }
  95. public void setChildren(boolean isChildren) {
  96. this.isChildren = isChildren;
  97. }
  98. public String getParentId() {
  99. return parentId;
  100. }
  101. public void setParentId(String parentId) {
  102. this.parentId = parentId;
  103. }
  104. public Tree(String id, String text, String state, boolean checked,
  105. List<Map<String, Object>> attributes, List<Tree<T>> children,
  106. boolean isParent, boolean isChildren, String parentID) {
  107. super();
  108. this.id = id;
  109. this.text = text;
  110. this.state = state;
  111. this.checked = checked;
  112. this.attributes = attributes;
  113. this.children = children;
  114. this.isParent = isParent;
  115. this.isChildren = isChildren;
  116. this.parentId = parentID;
  117. }
  118. public Tree() {
  119. super();
  120. }
  121. @Override
  122. public String toString() {
  123. return JSON.toJSONString(this);
  124. }
  125. }
复制代码

BuildTree.java

  2. package pers.kangxu.datautils.common.tree;
  3. import java.util.ArrayList;
  4. import java.util.List;
  5. import pers.kangxu.datautils.bean.tree.Tree;
  6. /**
  7. * 构建tree
  8. * TODO
  9. * <br>
  10. * @author kangxu2 2017-1-7
  11. *
  12. */
  13. public class BuildTree {
  14. /**
  15. *
  16. * TODO
  17. * <br>
  18. * @author kangxu2 2017-1-7
  19. *
  20. * @param nodes
  21. * @return
  22. */
  23. public static <T> Tree<T> build(List<Tree<T>> nodes) {
  24. if(nodes == null){
  25. return null;
  26. }
  27. List<Tree<T>> topNodes = new ArrayList<Tree<T>>();
  28. for (Tree<T> children : nodes) {
  29. String pid = children.getParentId();
  30. if (pid == null || "".equals(pid)) {
  31. topNodes.add(children);
  32. continue;
  33. }
  34. for (Tree<T> parent : nodes) {
  35. String id = parent.getId();
  36. if (id != null && id.equals(pid)) {
  37. parent.getChildren().add(children);
  38. children.setParent(true);
  39. parent.setChildren(true);
  40. continue;
  41. }
  42. }
  43. }
  44. Tree<T> root = new Tree<T>();
  45. if (topNodes.size() == 0) {
  46. root = topNodes.get(0);
  47. } else {
  48. root.setId("-1");
  49. root.setParentId("");
  50. root.setParent(false);
  51. root.setChildren(true);
  52. root.setChecked(true);
  53. root.setChildren(topNodes);
  54. root.setText("顶级节点");
  55. }
  56. return root;
  57. }
  58. }
复制代码

BuildTreeTester.java

  2. package pers.kangxu.datautils.test;
  3. import java.util.ArrayList;
  4. import java.util.List;
  5. import pers.kangxu.datautils.bean.tree.Tree;
  6. import pers.kangxu.datautils.common.tree.BuildTree;
  7. public class BuildTreeTester {
  8. public static void main(String[] args) {
  9. List<Tree<Test>> trees = new ArrayList<Tree<Test>>();
  10. List<Test> tests = new ArrayList<Test>();
  11. tests.add(new Test("0", "", "关于本人"));
  12. tests.add(new Test("1", "0", "技术学习"));
  13. tests.add(new Test("2", "0", "兴趣"));
  14. tests.add(new Test("3", "1", "JAVA"));
  15. tests.add(new Test("4", "1", "oracle"));
  16. tests.add(new Test("5", "1", "spring"));
  17. tests.add(new Test("6", "1", "springmvc"));
  18. tests.add(new Test("7", "1", "fastdfs"));
  19. tests.add(new Test("8", "1", "linux"));
  20. tests.add(new Test("9", "2", "骑行"));
  21. tests.add(new Test("10", "2", "吃喝玩乐"));
  22. tests.add(new Test("11", "2", "学习"));
  23. tests.add(new Test("12", "3", "String"));
  24. tests.add(new Test("13", "4", "sql"));
  25. tests.add(new Test("14", "5", "ioc"));
  26. tests.add(new Test("15", "5", "aop"));
  27. tests.add(new Test("16", "1", "等等"));
  28. tests.add(new Test("17", "2", "等等"));
  29. tests.add(new Test("18", "3", "等等"));
  30. tests.add(new Test("19", "4", "等等"));
  31. tests.add(new Test("20", "5", "等等"));
  32. for (Test test : tests) {
  33. Tree<Test> tree = new Tree<Test>();
  34. tree.setId(test.getId());
  35. tree.setParentId(test.getPid());
  36. tree.setText(test.getText());
  37. trees.add(tree);
  38. }
  39. Tree<Test> t = BuildTree.build(trees);
  40. System.out.println(t);
  41. }
  42. }
  43. class Test {
  44. private String id;
  45. private String pid;
  46. private String text;
  47. public String getId() {
  48. return id;
  49. }
  50. public void setId(String id) {
  51. this.id = id;
  52. }
  53. public String getPid() {
  54. return pid;
  55. }
  56. public void setPid(String pid) {
  57. this.pid = pid;
  58. }
  59. public String getText() {
  60. return text;
  61. }
  62. public void setText(String text) {
  63. this.text = text;
  64. }
  65. public Test(String id, String pid, String text) {
  66. super();
  67. this.id = id;
  68. this.pid = pid;
  69. this.text = text;
  70. }
  71. public Test() {
  72. super();
  73. }
  74. @Override
  75. public String toString() {
  76. return "Test [id=" + id + ", pid=" + pid + ", text=" + text + "]";
  77. }
  78. }
复制代码

4、运行结果

JSON数据：

  2. {
  3. "checked": true,
  4. "children": [
  5. {
  6. "checked": false,
  7. "children": [
  8. {
  9. "checked": false,
  10. "children": [
  11. {
  12. "checked": false,
  13. "children": [
  14. {
  15. "checked": false,
  16. "children": [],
  17. "id": "12",
  18. "parent": true,
  19. "parentId": "3",
  20. "state": "open",
  21. "text": "String"
  22. },
  23. {
  24. "checked": false,
  25. "children": [],
  26. "id": "18",
  27. "parent": true,
  28. "parentId": "3",
  29. "state": "open",
  30. "text": "等等"
  31. }
  32. ],
  33. "id": "3",
  34. "parent": true,
  35. "parentId": "1",
  36. "state": "open",
  37. "text": "JAVA"
  38. },
  39. {
  40. "checked": false,
  41. "children": [
  42. {
  43. "checked": false,
  44. "children": [],
  45. "id": "13",
  46. "parent": true,
  47. "parentId": "4",
  48. "state": "open",
  49. "text": "sql"
  50. },
  51. {
  52. "checked": false,
  53. "children": [],
  54. "id": "19",
  55. "parent": true,
  56. "parentId": "4",
  57. "state": "open",
  58. "text": "等等"
  59. }
  60. ],
  61. "id": "4",
  62. "parent": true,
  63. "parentId": "1",
  64. "state": "open",
  65. "text": "oracle"
  66. },
  67. {
  68. "checked": false,
  69. "children": [
  70. {
  71. "checked": false,
  72. "children": [],
  73. "id": "14",
  74. "parent": true,
  75. "parentId": "5",
  76. "state": "open",
  77. "text": "ioc"
  78. },
  79. {
  80. "checked": false,
  81. "children": [],
  82. "id": "15",
  83. "parent": true,
  84. "parentId": "5",
  85. "state": "open",
  86. "text": "aop"
  87. },
  88. {
  89. "checked": false,
  90. "children": [],
  91. "id": "20",
  92. "parent": true,
  93. "parentId": "5",
  94. "state": "open",
  95. "text": "等等"
  96. }
  97. ],
  98. "id": "5",
  99. "parent": true,
  100. "parentId": "1",
  101. "state": "open",
  102. "text": "spring"
  103. },
  104. {
  105. "checked": false,
  106. "children": [],
  107. "id": "6",
  108. "parent": true,
  109. "parentId": "1",
  110. "state": "open",
  111. "text": "springmvc"
  112. },
  113. {
  114. "checked": false,
  115. "children": [],
  116. "id": "7",
  117. "parent": true,
  118. "parentId": "1",
  119. "state": "open",
  120. "text": "fastdfs"
  121. },
  122. {
  123. "checked": false,
  124. "children": [],
  125. "id": "8",
  126. "parent": true,
  127. "parentId": "1",
  128. "state": "open",
  129. "text": "linux"
  130. },
  131. {
  132. "checked": false,
  133. "children": [],
  134. "id": "16",
  135. "parent": true,
  136. "parentId": "1",
  137. "state": "open",
  138. "text": "等等"
  139. }
  140. ],
  141. "id": "1",
  142. "parent": true,
  143. "parentId": "0",
  144. "state": "open",
  145. "text": "技术学习"
  146. },
  147. {
  148. "checked": false,
  149. "children": [
  150. {
  151. "checked": false,
  152. "children": [],
  153. "id": "9",
  154. "parent": true,
  155. "parentId": "2",
  156. "state": "open",
  157. "text": "骑行"
  158. },
  159. {
  160. "checked": false,
  161. "children": [],
  162. "id": "10",
  163. "parent": true,
  164. "parentId": "2",
  165. "state": "open",
  166. "text": "吃喝玩乐"
  167. },
  168. {
  169. "checked": false,
  170. "children": [],
  171. "id": "11",
  172. "parent": true,
  173. "parentId": "2",
  174. "state": "open",
  175. "text": "学习"
  176. },
  177. {
  178. "checked": false,
  179. "children": [],
  180. "id": "17",
  181. "parent": true,
  182. "parentId": "2",
  183. "state": "open",
  184. "text": "等等"
  185. }
  186. ],
  187. "id": "2",
  188. "parent": true,
  189. "parentId": "0",
  190. "state": "open",
  191. "text": "兴趣"
  192. }
  193. ],
  194. "id": "0",
  195. "parent": false,
  196. "parentId": "",
  197. "state": "open",
  198. "text": "关于本人"
  199. }
  200. ],
  201. "id": "-1",
  202. "parent": false,
  203. "parentId": "",
  204. "state": "open",
  205. "text": "顶级节点"
  206. }
复制代码

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