1. Utilization scenario
Organization tree usually has an organization table, which has code (code), pcode (superior code), name (organization name) and other fields
2. Structural data (the following data is not organizational data, but purely data made up by myself)
List> trees = new ArrayList >(); tests.add(new Test("0", "", "关于本人")); tests.add(new Test("1", "0", "技术学习")); tests.add(new Test("2", "0", "兴趣")); tests.add(new Test("3", "1", "JAVA")); tests.add(new Test("4", "1", "oracle")); tests.add(new Test("5", "1", "spring")); tests.add(new Test("6", "1", "springmvc")); tests.add(new Test("7", "1", "fastdfs")); tests.add(new Test("8", "1", "linux")); tests.add(new Test("9", "2", "骑行")); tests.add(new Test("10", "2", "吃喝玩乐")); tests.add(new Test("11", "2", "学习")); tests.add(new Test("12", "3", "String")); tests.add(new Test("13", "4", "sql")); tests.add(new Test("14", "5", "ioc")); tests.add(new Test("15", "5", "aop")); tests.add(new Test("16", "1", "等等")); tests.add(new Test("17", "2", "等等")); tests.add(new Test("18", "3", "等等")); tests.add(new Test("19", "4", "等等")); tests.add(new Test("20", "5", "等等"));
3. Source code
Tree.java
package pers.kangxu.datautils.bean.tree; import java.util.ArrayList; import java.util.List; import java.util.Map; import com.alibaba.fastjson.JSON; /** * tree TODO
* * @author kangxu2 2017-1-7 * */ public class Tree{ /** * 节点ID */ private String id; /** * 显示节点文本 */ private String text; /** * 节点状态,open closed */ private String state = "open"; /** * 节点是否被选中 true false */ private boolean checked = false; /** * 节点属性 */ private List
BuildTree.java
package pers.kangxu.datautils.common.tree; import java.util.ArrayList; import java.util.List; import pers.kangxu.datautils.bean.tree.Tree; /** * 构建tree * TODO *
* @author kangxu2 2017-1-7 * */ public class BuildTree { /** * * TODO *
* @author kangxu2 2017-1-7 * * @param nodes * @return */ public staticTree build(List > nodes) { if(nodes == null){ return null; } List > topNodes = new ArrayList >(); for (Tree children : nodes) { String pid = children.getParentId(); if (pid == null || "".equals(pid)) { topNodes.add(children); continue; } for (Tree parent : nodes) { String id = parent.getId(); if (id != null && id.equals(pid)) { parent.getChildren().add(children); children.setParent(true); parent.setChildren(true); continue; } } } Tree root = new Tree (); if (topNodes.size() == 0) { root = topNodes.get(0); } else { root.setId("-1"); root.setParentId(""); root.setParent(false); root.setChildren(true); root.setChecked(true); root.setChildren(topNodes); root.setText("顶级节点"); } return root; } }
##BuildTreeTester.java
package pers.kangxu.datautils.test; import java.util.ArrayList; import java.util.List; import pers.kangxu.datautils.bean.tree.Tree; import pers.kangxu.datautils.common.tree.BuildTree; public class BuildTreeTester { public static void main(String[] args) { List4. Running resultsJSON data:> trees = new ArrayList >(); List tests = new ArrayList (); tests.add(new Test("0", "", "关于本人")); tests.add(new Test("1", "0", "技术学习")); tests.add(new Test("2", "0", "兴趣")); tests.add(new Test("3", "1", "JAVA")); tests.add(new Test("4", "1", "oracle")); tests.add(new Test("5", "1", "spring")); tests.add(new Test("6", "1", "springmvc")); tests.add(new Test("7", "1", "fastdfs")); tests.add(new Test("8", "1", "linux")); tests.add(new Test("9", "2", "骑行")); tests.add(new Test("10", "2", "吃喝玩乐")); tests.add(new Test("11", "2", "学习")); tests.add(new Test("12", "3", "String")); tests.add(new Test("13", "4", "sql")); tests.add(new Test("14", "5", "ioc")); tests.add(new Test("15", "5", "aop")); tests.add(new Test("16", "1", "等等")); tests.add(new Test("17", "2", "等等")); tests.add(new Test("18", "3", "等等")); tests.add(new Test("19", "4", "等等")); tests.add(new Test("20", "5", "等等")); for (Test test : tests) { Tree tree = new Tree (); tree.setId(test.getId()); tree.setParentId(test.getPid()); tree.setText(test.getText()); trees.add(tree); } Tree t = BuildTree.build(trees); System.out.println(t); } } class Test { private String id; private String pid; private String text; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getPid() { return pid; } public void setPid(String pid) { this.pid = pid; } public String getText() { return text; } public void setText(String text) { this.text = text; } public Test(String id, String pid, String text) { super(); this.id = id; this.pid = pid; this.text = text; } public Test() { super(); } @Override public String toString() { return "Test [id=" + id + ", pid=" + pid + ", text=" + text + "]"; } }
{ "checked": true, "children": [ { "checked": false, "children": [ { "checked": false, "children": [ { "checked": false, "children": [ { "checked": false, "children": [], "id": "12", "parent": true, "parentId": "3", "state": "open", "text": "String" }, { "checked": false, "children": [], "id": "18", "parent": true, "parentId": "3", "state": "open", "text": "等等" } ], "id": "3", "parent": true, "parentId": "1", "state": "open", "text": "JAVA" }, { "checked": false, "children": [ { "checked": false, "children": [], "id": "13", "parent": true, "parentId": "4", "state": "open", "text": "sql" }, { "checked": false, "children": [], "id": "19", "parent": true, "parentId": "4", "state": "open", "text": "等等" } ], "id": "4", "parent": true, "parentId": "1", "state": "open", "text": "oracle" }, { "checked": false, "children": [ { "checked": false, "children": [], "id": "14", "parent": true, "parentId": "5", "state": "open", "text": "ioc" }, { "checked": false, "children": [], "id": "15", "parent": true, "parentId": "5", "state": "open", "text": "aop" }, { "checked": false, "children": [], "id": "20", "parent": true, "parentId": "5", "state": "open", "text": "等等" } ], "id": "5", "parent": true, "parentId": "1", "state": "open", "text": "spring" }, { "checked": false, "children": [], "id": "6", "parent": true, "parentId": "1", "state": "open", "text": "springmvc" }, { "checked": false, "children": [], "id": "7", "parent": true, "parentId": "1", "state": "open", "text": "fastdfs" }, { "checked": false, "children": [], "id": "8", "parent": true, "parentId": "1", "state": "open", "text": "linux" }, { "checked": false, "children": [], "id": "16", "parent": true, "parentId": "1", "state": "open", "text": "等等" } ], "id": "1", "parent": true, "parentId": "0", "state": "open", "text": "技术学习" }, { "checked": false, "children": [ { "checked": false, "children": [], "id": "9", "parent": true, "parentId": "2", "state": "open", "text": "骑行" }, { "checked": false, "children": [], "id": "10", "parent": true, "parentId": "2", "state": "open", "text": "吃喝玩乐" }, { "checked": false, "children": [], "id": "11", "parent": true, "parentId": "2", "state": "open", "text": "学习" }, { "checked": false, "children": [], "id": "17", "parent": true, "parentId": "2", "state": "open", "text": "等等" } ], "id": "2", "parent": true, "parentId": "0", "state": "open", "text": "兴趣" } ], "id": "0", "parent": false, "parentId": "", "state": "open", "text": "关于本人" } ], "id": "-1", "parent": false, "parentId": "", "state": "open", "text": "顶级节点" }More JAVA based on database table content For articles related to the example code for producing tree-structured JSON data, please pay attention to the PHP Chinese website!