java通过pid、parentId生成tree树形结构json集合.将pojo集合类根据pid自动生成树形json

java通过pid、parentId生成tree树形结构json集合
将pojo集合类根据pid自动生成树形json

以下为代码示例，参照网上进行调整过后的，应用于项目

 

////////////////////////////////////////BuildUICmb 

 

package com.hbcw.finance.main.utils.UICmb;

 

import java.util.ArrayList;

import java.util.List;

 

 

/**

 * 构建前端需要的树形结构字符串 @备注：

 * 

 * @author: lili

 * @create date:2018年10月17日

 */

public class BuildUICmb {

 

/**

* 将集合的pid对象转换有child的集合

* @param nodes

* @return

*/

public static <T> List<UICmbVo<T>> build_Trees(List<UICmbVo<T>> nodes) {

 

if (nodes == null) {

return null;

}

List<UICmbVo<T>> topNodes = new ArrayList<UICmbVo<T>>();

for (UICmbVo<T> children : nodes) {

 

String pid = children.getParentId();

if ("0".equals(pid)) {//根级结点

topNodes.add(children);

continue;

}

 

for (UICmbVo<T> parent : nodes) {

String id = parent.getValue();

if (id != null && id.equals(pid)) {//表示有子级结点，就给Children设置对象

if(null == parent.getChildren()){

parent.setChildren(new ArrayList<UICmbVo<T>>());

}

parent.getChildren().add(children);

//children.setParent(true);

//parent.setChildren(true);

 

continue;

}

}

 

}

 

return topNodes;

}

 

 

}

 

//////////////////////////////////////////////////////////TreeTmpBean 

 

package com.hbcw.finance.main.utils.UICmb;

 

import java.io.Serializable;

 

/**

 * 树形 pojo@备注：

 * 

 * @author: lili

 * @create date:2018年10月11日

 */

public class TreeTmpBean implements Serializable {

/**

* 

*/

private static final long serialVersionUID = 1L;

private String id;//

private String name;// 单位全称/部门的名字',

private String pid;// 数据类型1公司2部门3职位',

 

public TreeTmpBean(){

super();

}

 

public TreeTmpBean(String id,String pid,String name){

this.id = id;

this.name = name;

this.pid = pid;

}

 

public String getId() {

return id;

}

 

public void setId(String id) {

this.id = id;

}

 

public String getName() {

return name;

}

 

public void setName(String name) {

this.name = name;

}

 

public String getPid() {

return pid;

}

 

public void setPid(String pid) {

this.pid = pid;

}

 

}

 

//////////////////////////////////////////////////////////////////////UICmbVo

package com.hbcw.finance.main.utils.UICmb;

 

import java.util.ArrayList;

import java.util.List;

 

import com.alibaba.fastjson.JSON;

 

/**

 * 装返回的数据 @备注：

 * 

 * @author: lili

 * @create date:2018年10月17日

 */

public class UICmbVo<T> {

 

private String value;//代替树的id

private String label;//代替树显示的值 

private List<UICmbVo<T>> children ;

//private List<Tree<T>> children = new ArrayList<Tree<T>>();

 

private String code;

 

/**

* 父ID

*/

private String parentId;

///**

// * 是否有父节点

// */

//private boolean isParent = false;

///**

// * 是否有子节点

// */

//private boolean isChildren = false;

 

public String getValue() {

return value;

}

 

public void setValue(String value) {

this.value = value;

}

 

public String getLabel() {

return label;

}

 

public void setLabel(String label) {

this.label = label;

}

 

public List<UICmbVo<T>> getChildren() {

return children;

}

 

public void setChildren(List<UICmbVo<T>> children) {

this.children = children;

}

 

public String getParentId() {

return parentId;

}

 

public void setParentId(String parentId) {

this.parentId = parentId;

}

 

 

 

//public boolean isParent() {

//return isParent;

//}

//

//public void setParent(boolean isParent) {

//this.isParent = isParent;

//}

//

//public boolean isChildren() {

//return isChildren;

//}

//

//public void setChildren(boolean isChildren) {

//this.isChildren = isChildren;

//}

 

public String getCode() {

return code;

}

 

public void setCode(String code) {

this.code = code;

}

 

@Override

public String toString() {

return JSON.toJSONString(this);

}

}

 

 

//////////////////////////////////////////////////////T.java  测试类

 

package com.hbcw.finance.main.utils.UICmb;

 

import java.util.ArrayList;

import java.util.List;

 

public class T {

 

public static void main(String[] args) {

     

    List<UICmbVo<TreeTmpBean>> trees = new ArrayList<UICmbVo<TreeTmpBean>>();

    List<TreeTmpBean> tests = new ArrayList<TreeTmpBean>();

 

     

    //多级的json数组

    tests.add(new TreeTmpBean("0000", "0", "编程语言"));

    tests.add(new TreeTmpBean("01", "0000", "c++"));

    tests.add(new TreeTmpBean("02", "0000", "java"));

    tests.add(new TreeTmpBean("0101", "01", "MFC"));

    tests.add(new TreeTmpBean("0201", "02", "spring"));

    tests.add(new TreeTmpBean("0202", "02", "hadoop"));

    tests.add(new TreeTmpBean("020101", "0202", "hdfs"));

    tests.add(new TreeTmpBean("020102", "0202", "hbase"));

    

    tests.add(new TreeTmpBean("10121113342220000", "0", "学科"));

    tests.add(new TreeTmpBean("000201", "10121113342220000", "语文"));

    tests.add(new TreeTmpBean("000202", "10121113342220000", "数学"));

    for (TreeTmpBean test : tests) {

      UICmbVo<TreeTmpBean> tree = new UICmbVo<TreeTmpBean>();

      tree.setValue(test.getId());

      tree.setParentId(test.getPid());

      tree.setLabel(test.getName());

      trees.add(tree);

    }

    List<UICmbVo<TreeTmpBean>> t = BuildUICmb.build_Trees(trees);

    String json = t.toString();

    System.out.println(json);

  }

}