1.實體類studentTree

import lombok.Data;
import java.util.List;

@Data
public class StudentTree {
    private String id;
    private String parent;
    private String name;
    private String school;
　　private String type;
    private List<StudentTree> children;
}

2.controller層

 @GetMapping("treeList")
    @ApiOperation(value
 
="樹")
    public ResponseEntity treeList(String type){
        return ResponseEntity.ok(pageHelperService.treeList(type));
    }

3.service層

private static final String TREE_ROOT_CODE = "0";
    public List<StudentTree> treeList(String type) {
        List<StudentTree> record = pageHelperMapper.treeList(type);
        List
 
<StudentTree> treeList = new LinkedList();
        for (StudentTree sysDept : record) {
            if (TREE_ROOT_CODE.equals(sysDept.getParent())) {
                StudentTree tableHeaderInfo = new StudentTree();
                BeanUtils.copyProperties(sysDept,tableHeaderInfo);
                tableHeaderInfo.setChildren(getChild(sysDept.getId(), record));
                treeList.add(tableHeaderInfo);
            }
        }
        
 
return treeList;
    }

    private static List<StudentTree> getChild(String code, List<StudentTree> record) {
        List<StudentTree> childrenList = new LinkedList();
        for (StudentTree studentTree : record) {
            if (code.equals(studentTree.getParent())) {
                StudentTree tableHeaderInfo = new StudentTree();
                BeanUtils.copyProperties(studentTree,tableHeaderInfo);
                tableHeaderInfo.setChildren(getChild(studentTree.getId(), record));
                childrenList.add(tableHeaderInfo);
            }
        }
        return childrenList;
    }

4.postman進行測試（http://localhost:埠號/page/treeList?type=1）

5.結果

[ { "id":"1", "parent":"0", "name":"11", "school":"111", "type":"1", "children":[ { "id":"6", "parent":"1", "name":"66", "school":"666", "type":"1", "children":[ { "id":"7", "parent":"6", "name":"77", "school":"777", "type":"1", "children":[ { "id":"8", "parent":"7", "name":"88", "school":"888", "type":"1", "children":[] } ] } ] } ] }, { "id":"2", "parent":"0", "name":"22", "school":"222", "type":"1", "children":[] }, { "id":"3", "parent":"0", "name":"33", "school":"333", "type":"1", "children":[] }, { "id":"4", "parent":"0", "name":"44", "school":"444", "type":"1", "children":[] } ]

final:不積跬步,無以至千里.不積小流,無以成江海