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组织树查询-Jvava实现（递归）

2023-04-19 13:44 由 你会很厉害的 发表于 #后端开发

1.首先查询出组织机构

就是一个简单的查询

List<Dept> deptList = mapper.getDeptList();
        Map<Long, OrgNode> nodeMap = new HashMap<>();
        List<Long> rootIds = new ArrayList<>();
        for (Dept dept : deptList) {
            Long deptId = dept.getDeptId();
            String name = dept.getDeptName();
            Long parentId = dept.getParentId();
            OrgNode node = nodeMap.computeIfAbsent(deptId, OrgNode::new);
            node.setId(deptId);
            node.setLabel(name);
            node.setParentId(parentId);

            if (parentId == 0) {
                rootIds.add(deptId);
            } else {
                OrgNode parent = nodeMap.computeIfAbsent(parentId, OrgNode::new);
                parent.getChildren().add(node);
            }
        }
        // 3. 输出组织机构
        List<OrgNode> orgList = new ArrayList<>();
        for (long rootId : rootIds) {
            orgList.add(nodeMap.get(rootId));
        }
        List<Map<String, Object>> result = dfs2(orgList);

2.def2方法,只查询两级

业务需要

/**
     * 只查询两级
     * @param nodes
     * @return
     */
    private static List<Map<String, Object>> dfs2(List<OrgNode> nodes) {
        List<Map<String, Object>> result = new ArrayList<>();
        for (OrgNode node : nodes) {
            Map<String, Object> map = new HashMap<>();
            map.put("id", node.getId());
            map.put("label", node.getLabel());
            map.put("parentId", node.getParentId());
            List<OrgNode> children = node.getChildren();
            if (children != null && !children.isEmpty()){
                List<OrgNode> collect = children.stream().peek(s -> s.setChildren(null)).collect(Collectors.toList());
                map.put("children", collect);
            }
            result.add(map);
        }
        return result;
    }

效果

查询所有级别递归查询


/**
     * 查询所有组织树
     * @param nodes
     * @return
     */
    private static List<Map<String, Object>> dfs(List<OrgNode> nodes) {
        List<Map<String, Object>> result = new ArrayList<>();
        for (OrgNode node : nodes) {
            Map<String, Object> map = new HashMap<>();
            map.put("id", node.getId());
            map.put("label", node.getLabel());
            map.put("parentId", node.getParentId());
            List<OrgNode> children = node.getChildren();
            if (children != null && !children.isEmpty()) {
                map.put("children", dfs(children));
            }
            result.add(map);
        }
        return result;
    }

3.前端代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>树形控件</title>
    <script src="js/vue.js"></script>
    <script src="element-ui/lib/index.js"></script>
    <script src="js/axios-0.18.0.js"></script>
    <link rel="stylesheet" href="element-ui/lib/theme-chalk/index.css">
</head>
<body>
<div id="app">
    <el-tree
            :data="data"
            show-checkbox
            default-expand-all
            node-key="id"
            ref="tree"
            highlight-current
            :props="defaultProps"
            @check-change="handleCheckChange"
            :indent="20"
    >
    </el-tree>
    <el-button @click="getCheckedNodes">通过 node 获取</el-button>
</div>



<script>
    new Vue({
        el:"#app",
        methods:{
            getCheckedNodes(){
              console.log("打印选中结果："+this.selectedNodeData)
            },
            handleCheckChange(data, targetNode){
                let checkedNodes = this.$refs.tree.getCheckedNodes() // 获取所有选中的节点数据
                // console.log('当前选中的节点：', checkedNodes)
                // 获取选中节点的 ID 列表
                let checkedNodeIds = checkedNodes.map(node => {
                    return node.id
                })
                this.selectedNodeData=checkedNodeIds;
                console.log('当前选中的节点 ID 列表：', this.selectedNodeData)
            },
            getNodeIds(node, ids) {
                // 处理当前节点的 ID
                ids.push(node.id)

                // 处理所有子节点的 ID
                for (let child of node.children) {
                    this.getNodeIds(child, ids)
                }
            },
            getList(){
                axios.get('http://localhost:8081/brand_case/dao.do?method=list_tree').then( res=>{
                        this.data=res.data.data
                    }
                )
            }
        },
        created(){
            this.getList();
        },
        data(){
            return{
                selectedNodeData: [],
                data: [{
                    id: 1,
                    label: '一级 1',
                    children: [{
                        id: 4,
                        label: '二级 1-1',
                        children: [{
                            id: 9,
                            label: '三级 1-1-1'
                        }, {
                            id: 10,
                            label: '三级 1-1-2'
                        }]
                    }]
                }, {
                    id: 2,
                    label: '一级 2',
                    children: [{
                        id: 5,
                        label: '二级 2-1'
                    }, {
                        id: 6,
                        label: '二级 2-2'
                    }]
                }, {
                    id: 3,
                    label: '一级 3',
                    children: [{
                        id: 7,
                        label: '二级 3-1',
                        children: [{
                            id: 7-1,
                            label: '二级 3-1-1'
                        }]
                    }, {
                        id: 8,
                        label: '二级 3-2'
                    }]
                }],
                defaultProps: {
                    children: 'children',
                    label: 'label'
                }
            }
        }
    })
</script>
</body>
</html>

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