JAVA后台转换成树结构数据返回给前端的实现方法
我们会经常用到树形,那么树形结构的数据是在前端做还是在后台做呢?我自己用过前端的ztree,selectTree等这些属于前端的组件,后台只需要把一个表的所有数据返回给前段就可以,前端可以通过id,pid来把层级结构划分,要是我们前端需要后台直接返回树结构数据怎么办,那么接下来我给大家介绍一下我写过的例子。
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我们先看一张图了解一下树结构:我这里随便找一张图了解一下即可
接下来我们看一下数据,主要包括id,pid,名称
接下来我们写一个小例子,用递归方式转换为数
实体:
package cn.ccccltd.ccccoi.mediumterminvestment.domain; import java.io.Serializable; import java.util.List; /** * @Description:返回前端,业务模块 * @author yujiaqi * @date: 2019年9月9日下午2:07:19 */ public class ProjectBasicInfoDTO implements Serializable { private static final long serialVersionUID = 1L; private String id; private String pId; private String key; private String title; private String value; private Listchildren; private Boolean selectable; private Boolean disableCheckbox; private Boolean disabled; public String getId() { return id; } public String getValue() { return value; } public void setValue(String value) { this.value = value; } public void setId(String id) { this.id = id; } public String getpId() { return pId; } public void setpId(String pId) { this.pId = pId; } public String getKey() { return key; } public void setKey(String key) { this.key = key; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public List getChildren() { return children; } public void setChildren(List children) { this.children = children; } public Boolean getSelectable() { return selectable; } public void setSelectable(Boolean selectable) { this.selectable = selectable; } public Boolean getDisableCheckbox() { return disableCheckbox; } public void setDisableCheckbox(Boolean disableCheckbox) { this.disableCheckbox = disableCheckbox; } public Boolean getDisabled() { return disabled; } public void setDisabled(Boolean disabled) { this.disabled = disabled; } public static long getSerialversionuid() { return serialVersionUID; } }
service实现类
/** * 查询投资项目资金来源 */ @Override public ListqueryFundingSource() { //查询投资项目资金来源 List list = projectBasicInfoMapper.queryDictionaryBean(Constant.FUNDING_SOURCE,Constant.DELFLAG); List dataProcessing = ProjectBasicInfoServiceImpl.dataProcessing(list); List buildByRecursive = TreeUtils.buildByRecursive(dataProcessing); return buildByRecursive; } /** * 将字典数据遍历放入ProjectBasicInfoDTO实体中 * @param list * @return */ public static List dataProcessing(List list){ List list1 = Lists.newArrayList(); for (DictionaryBean dictionaryBean : list) { ProjectBasicInfoDTO projectBasicInfoDTO = new ProjectBasicInfoDTO(); projectBasicInfoDTO.setId(dictionaryBean.getItemId()); projectBasicInfoDTO.setpId(dictionaryBean.getItemParentId()); projectBasicInfoDTO.setKey(dictionaryBean.getItemId()); projectBasicInfoDTO.setTitle(dictionaryBean.getItemFullName()); projectBasicInfoDTO.setValue(dictionaryBean.getItemFullName()); projectBasicInfoDTO.setSelectable(false); projectBasicInfoDTO.setDisableCheckbox(true); projectBasicInfoDTO.setDisabled(true); list1.add(projectBasicInfoDTO); } return list1; }
递归方法工具类
package cn.ccccltd.ccccoi.mediumterminvestment.util; import java.util.ArrayList; import java.util.List; import cn.ccccltd.ccccoi.mediumterminvestment.domain.ProjectBasicInfoDTO; public class TreeUtils { /** * 使用递归方法建树 * @param treeNodes * @return */ public static ListbuildByRecursive(List projectBasicInfoDTOs) { List trees = new ArrayList (); for (ProjectBasicInfoDTO projectBasicInfoDTO : projectBasicInfoDTOs) { if ("".equals(projectBasicInfoDTO.getpId()) || projectBasicInfoDTO.getpId() == null ) { trees.add(findChildren(projectBasicInfoDTO,projectBasicInfoDTOs)); } } return trees; } /** * 递归查找子节点 * @param treeNodes * @return */ public static ProjectBasicInfoDTO findChildren(ProjectBasicInfoDTO projectBasicInfoDTO,List projectBasicInfoDTOs) { for (ProjectBasicInfoDTO projectBasicInfoDTO2 : projectBasicInfoDTOs) { if(projectBasicInfoDTO.getId().equals(projectBasicInfoDTO2.getpId())) { if(projectBasicInfoDTO.getChildren() == null) { projectBasicInfoDTO.setChildren(new ArrayList ()); } //是否还有子节点,如果有的话继续往下遍历,如果没有则直接返回 projectBasicInfoDTO.getChildren().add(findChildren(projectBasicInfoDTO2,projectBasicInfoDTOs)); } } return projectBasicInfoDTO; } }
树结构效果图
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