java後臺接口樹形結構json數據返回

適用於父子關係的數據結構。

//從數據庫中查找所有地址

@Select("select t.id as addressId,t.address_name as addressName,t.parent_id as parentId from t_equipment_address t")

public List<EquipmentAddressVo> getAllEquipmentAddress();

//工具類

public class TreeUtil {
// RecursiveEquipmentType
public static List<EquipmentAddressVo> RecursiveAddress(List<EquipmentAddressVo> treeNodes){
List<EquipmentAddressVo> trees = new ArrayList<EquipmentAddressVo>();  
        for (EquipmentAddressVo treeNode : treeNodes) {  
            if ("".equals(treeNode.getParentId()) || null==treeNode.getParentId() ) {  
                trees.add(findAddressChildren(treeNode,treeNodes));  
            }  
        }  
        return trees;  
}

/** 
     * 遞歸查找地址子節點 
     * @param treeNodes 
     * @return 
     */  
 public static EquipmentAddressVo findAddressChildren(EquipmentAddressVo treeNode,List<EquipmentAddressVo> treeNodes) {  
        for (EquipmentAddressVo it : treeNodes) {  
            if(treeNode.getAddressId().equals(it.getParentId())) {  
                if (treeNode.getChildren() == null) {  
                    treeNode.setChildren(new ArrayList<EquipmentAddressVo>());  
                }  
                treeNode.getChildren().add(findAddressChildren(it,treeNodes));  
            }  
        }  
        return treeNode;  
    } 

}

//vo實體類

public class EquipmentAddressVo {

/**
* 地址ID
*/
@ApiModelProperty("地址ID")
private String addressId;
/**
* 地址名稱
*/
@ApiModelProperty("地址名稱")
private String addressName;

/**
* 父級地址ID
*/
@ApiModelProperty("父級地址ID")
private String parentId;

private List<EquipmentAddressVo> children;

public List<EquipmentAddressVo> getChildren() {
return children;
}
public void setChildren(List<EquipmentAddressVo> children) {
this.children = children;
}
public String getAddressId() {
return addressId;
}
public void setAddressId(String addressId) {
this.addressId = addressId;
}
public String getAddressName() {
return addressName;
}
public void setAddressName(String addressName) {
this.addressName = addressName;
}
public String getParentId() {
return parentId;
}
public void setParentId(String parentId) {
this.parentId = parentId;
}

}

//controller層  將數據庫中的地址使用treeutil類進行遞歸封裝

List<EquipmentAddressVo> list = equipmentAddressService.getAllEquipmentAddress();

ResultMsg  = new ResultMsg(ResultStatusCode.OK,TreeUtil.RecursiveAddress(list));

//返回結果

{
    "code": 200,
    "msg": "OK",
    "data": [
        {
            "addressId": "5dcc1568f5ca11e78dcb96adab3e1483",
            "addressName": "廣東",
            "parentId": null,
            "children": [
                {
                    "addressId": "97f24626f5ca11e78dcb96adab3e1483",
                    "addressName": "深圳",
                    "parentId": "5dcc1568f5ca11e78dcb96adab3e1483",
                    "children": [
                        {
                            "addressId": "803b083df78411e78dcb96adab3e1483",
                            "addressName": "二樓標準件倉",
                            "parentId": "97f24626f5ca11e78dcb96adab3e1483",
                            "children": null
                        },
                        {
                            "addressId": "d39844b0f5ca11e78dcb96adab3e1483",
                            "addressName": "五樓咖啡廳",
                            "parentId": "97f24626f5ca11e78dcb96adab3e1483",
                            "children": null
                        },
                        {
                            "addressId": "d39cbe3bf5ca11e78dcb96adab3e1483",
                            "addressName": "四樓行政部",
                            "parentId": "97f24626f5ca11e78dcb96adab3e1483",
                            "children": null
                        },
                        {
                            "addressId": "d3a0b68cf5ca11e78dcb96adab3e1483",
                            "addressName": "五樓平臺部",
                            "parentId": "97f24626f5ca11e78dcb96adab3e1483",
                            "children": null
                        },
                        {
                            "addressId": "d3a4d224f5ca11e78dcb96adab3e1483",
                            "addressName": "三樓車間",
                            "parentId": "97f24626f5ca11e78dcb96adab3e1483",
                            "children": null
                        },
                        {
                            "addressId": "d3a930b0f5ca11e78dcb96adab3e1483",
                            "addressName": "財務室",
                            "parentId": "97f24626f5ca11e78dcb96adab3e1483",
                            "children": null
                        },
                        {
                            "addressId": "d3ac5a2df5ca11e78dcb96adab3e1483",
                            "addressName": "食堂",
                            "parentId": "97f24626f5ca11e78dcb96adab3e1483",
                            "children": null
                        }
                    ]
                }
            ]
        },
        {
            "addressId": "5dd1a5b3f5ca11e78dcb96adab3e1483",
            "addressName": "湖南",
            "parentId": null,
            "children": [
                {
                    "addressId": "97f9d0c6f5ca11e78dcb96adab3e1483",
                    "addressName": "長沙",
                    "parentId": "5dd1a5b3f5ca11e78dcb96adab3e1483",
                    "children": [
                        {
                            "addressId": "650a19cff5cb11e78dcb96adab3e1483",
                            "addressName": "A棟一樓",
                            "parentId": "97f9d0c6f5ca11e78dcb96adab3e1483",
                            "children": null
                        },
                        {
                            "addressId": "650ca4c3f5cb11e78dcb96adab3e1483",
                            "addressName": "保安室(大門)",
                            "parentId": "97f9d0c6f5ca11e78dcb96adab3e1483",
                            "children": null
                        },
                        {
                            "addressId": "650ffa8ff5cb11e78dcb96adab3e1483",
                            "addressName": "A棟二樓",
                            "parentId": "97f9d0c6f5ca11e78dcb96adab3e1483",
                            "children": null
                        },
                        {
                            "addressId": "651382c3f5cb11e78dcb96adab3e1483",
                            "addressName": "A棟三樓",
                            "parentId": "97f9d0c6f5ca11e78dcb96adab3e1483",
                            "children": null
                        },
                        {
                            "addressId": "65176866f5cb11e78dcb96adab3e1483",
                            "addressName": "B棟一樓",
                            "parentId": "97f9d0c6f5ca11e78dcb96adab3e1483",
                            "children": null
                        },
                        {
                            "addressId": "651b02aef5cb11e78dcb96adab3e1483",
                            "addressName": "B棟二樓",
                            "parentId": "97f9d0c6f5ca11e78dcb96adab3e1483",
                            "children": null
                        }
                    ]
                }
            ]
        }
    ]
}