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JAVA后臺(tái)轉(zhuǎn)換成樹結(jié)構(gòu)數(shù)據(jù)返回給前端的實(shí)現(xiàn)方法

更新時(shí)間：2020年03月23日 10:38:42 作者：qq_42281649

這篇文章主要介紹了JAVA后臺(tái)轉(zhuǎn)換成樹結(jié)構(gòu)數(shù)據(jù)返回給前端的實(shí)現(xiàn)方法，文中通過示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

我們會(huì)經(jīng)常用到樹形，那么樹形結(jié)構(gòu)的數(shù)據(jù)是在前端做還是在后臺(tái)做呢？我自己用過前端的ztree,selectTree等這些屬于前端的組件，后臺(tái)只需要把一個(gè)表的所有數(shù)據(jù)返回給前段就可以，前端可以通過id,pid來把層級(jí)結(jié)構(gòu)劃分，要是我們前端需要后臺(tái)直接返回樹結(jié)構(gòu)數(shù)據(jù)怎么辦，那么接下來我給大家介紹一下我寫過的例子。

我們先看一張圖了解一下樹結(jié)構(gòu)：我這里隨便找一張圖了解一下即可

接下來我們看一下數(shù)據(jù)，主要包括id,pid，名稱

接下來我們寫一個(gè)小例子，用遞歸方式轉(zhuǎn)換為數(shù)

實(shí)體：

package cn.ccccltd.ccccoi.mediumterminvestment.domain;

import java.io.Serializable;
import java.util.List;

/**
 * @Description:返回前端，業(yè)務(wù)模塊
 * @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 List<ProjectBasicInfoDTO> children;
  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<ProjectBasicInfoDTO> getChildren() {
    return children;
  }
  public void setChildren(List<ProjectBasicInfoDTO> 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實(shí)現(xiàn)類

/**
   * 查詢投資項(xiàng)目資金來源
   */
   @Override
   public List<ProjectBasicInfoDTO> queryFundingSource() {
     //查詢投資項(xiàng)目資金來源
     List<DictionaryBean> list = projectBasicInfoMapper.queryDictionaryBean(Constant.FUNDING_SOURCE,Constant.DELFLAG);
     List<ProjectBasicInfoDTO> dataProcessing = ProjectBasicInfoServiceImpl.dataProcessing(list);
     List<ProjectBasicInfoDTO> buildByRecursive = TreeUtils.buildByRecursive(dataProcessing);
     return buildByRecursive;
   }
  
  
  /**
   * 將字典數(shù)據(jù)遍歷放入ProjectBasicInfoDTO實(shí)體中
   * @param list
   * @return
   */
  public static List<ProjectBasicInfoDTO> dataProcessing(List<DictionaryBean> list){
    List<ProjectBasicInfoDTO> 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;
  }

遞歸方法工具類

package cn.ccccltd.ccccoi.mediumterminvestment.util;

import java.util.ArrayList;
import java.util.List;

import cn.ccccltd.ccccoi.mediumterminvestment.domain.ProjectBasicInfoDTO;

public class TreeUtils {
  /**
   * 使用遞歸方法建樹
   * @param treeNodes
   * @return
   */
  public static List<ProjectBasicInfoDTO> buildByRecursive(List<ProjectBasicInfoDTO> projectBasicInfoDTOs) {
    List<ProjectBasicInfoDTO> trees = new ArrayList<ProjectBasicInfoDTO>();
    for (ProjectBasicInfoDTO projectBasicInfoDTO : projectBasicInfoDTOs) {
      if ("".equals(projectBasicInfoDTO.getpId()) || projectBasicInfoDTO.getpId() == null ) {
        trees.add(findChildren(projectBasicInfoDTO,projectBasicInfoDTOs));
      }
    }
    return trees;
  }
  
  /**
  * 遞歸查找子節(jié)點(diǎn)
  * @param treeNodes
  * @return
  */
  public static ProjectBasicInfoDTO findChildren(ProjectBasicInfoDTO projectBasicInfoDTO,List<ProjectBasicInfoDTO> projectBasicInfoDTOs) {
    for (ProjectBasicInfoDTO projectBasicInfoDTO2 : projectBasicInfoDTOs) {
      if(projectBasicInfoDTO.getId().equals(projectBasicInfoDTO2.getpId())) {
        if(projectBasicInfoDTO.getChildren() == null) {
          projectBasicInfoDTO.setChildren(new ArrayList<ProjectBasicInfoDTO>());
        }
        //是否還有子節(jié)點(diǎn)，如果有的話繼續(xù)往下遍歷，如果沒有則直接返回
        projectBasicInfoDTO.getChildren().add(findChildren(projectBasicInfoDTO2,projectBasicInfoDTOs));
      }
    }
    return projectBasicInfoDTO;
  }
}

樹結(jié)構(gòu)效果圖

到此這篇關(guān)于JAVA后臺(tái)轉(zhuǎn)換成樹結(jié)構(gòu)數(shù)據(jù)返回給前端的實(shí)現(xiàn)方法的文章就介紹到這了,更多相關(guān)JAVA轉(zhuǎn)換樹結(jié)構(gòu)返回前端內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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