1、利用場景
組織機構樹,通常會有組織機構表,其中有code(代碼),pcode(上級代碼),name(組織名稱)等欄位
2、建構資料(以下資料並不是組織機構數據,而純屬本人胡編亂造的數據)
List<Tree<Test>> trees = new ArrayList<Tree<Test>>(); 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、源碼
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 <br> * * @author kangxu2 2017-1-7 * */ public class Tree<T> { /** * 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<Map<String, Object>> attributes; /** * 节点的子节点 */ private List<Tree<T>> children = new ArrayList<Tree<T>>(); /** * 父ID */ private String parentId; /** * 是否有父节点 */ private boolean isParent = false; /** * 是否有子节点 */ private boolean isChildren = false; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getText() { return text; } public void setText(String text) { this.text = text; } public String getState() { return state; } public void setState(String state) { this.state = state; } public boolean isChecked() { return checked; } public void setChecked(boolean checked) { this.checked = checked; } public List<Map<String, Object>> getAttributes() { return attributes; } public void setAttributes(List<Map<String, Object>> attributes) { this.attributes = attributes; } public List<Tree<T>> getChildren() { return children; } public void setChildren(List<Tree<T>> children) { this.children = children; } public boolean isParent() { return isParent; } public void setParent(boolean isParent) { this.isParent = isParent; } public boolean isChildren() { return isChildren; } public void setChildren(boolean isChildren) { this.isChildren = isChildren; } public String getParentId() { return parentId; } public void setParentId(String parentId) { this.parentId = parentId; } public Tree(String id, String text, String state, boolean checked, List<Map<String, Object>> attributes, List<Tree<T>> children, boolean isParent, boolean isChildren, String parentID) { super(); this.id = id; this.text = text; this.state = state; this.checked = checked; this.attributes = attributes; this.children = children; this.isParent = isParent; this.isChildren = isChildren; this.parentId = parentID; } public Tree() { super(); } @Override public String toString() { return JSON.toJSONString(this); } }
BuildTreeTester.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 * <br> * @author kangxu2 2017-1-7 * */ public class BuildTree { /** * * TODO * <br> * @author kangxu2 2017-1-7 * * @param nodes * @return */ public static <T> Tree<T> build(List<Tree<T>> nodes) { if(nodes == null){ return null; } List<Tree<T>> topNodes = new ArrayList<Tree<T>>(); for (Tree<T> children : nodes) { String pid = children.getParentId(); if (pid == null || "".equals(pid)) { topNodes.add(children); continue; } for (Tree<T> parent : nodes) { String id = parent.getId(); if (id != null && id.equals(pid)) { parent.getChildren().add(children); children.setParent(true); parent.setChildren(true); continue; } } } Tree<T> root = new Tree<T>(); 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; } }