Java 对象转xml (dom 4j)

package cn.amberdata.erms.domain.model;

import cn.amberdata.erms.persistence.dao.ITreeViewDao;
import cn.amberdata.erms.persistence.po.TreeViewPO;
import cn.amberdata.erms.persistence.util.context.ApplicationUtils;
import com.datamber.common.session.DomainObject;
import com.datamber.common.session.Session;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.springframework.beans.BeanUtils;

import java.util.List;

/**
 * 树形视图配置对象
 * <p/>
 * 适用 ：在管理区，整理做树形菜单分类显示数据
 * 或者用户组织架构显示数据
 *
 * @author 
 * @see TreeView
 * @since 2019/5/8
 */

@NoArgsConstructor
@Data
public class TreeView extends DomainObject {
    /**
     * 唯一标识id
     */

    private String objectId;
    /**
     * 名称
     */

    private String name;

    /**
     * 区域：整理区 管理区
     */

    private String region;

    /**
     * 全宗
     */

    private String fondsId;

    /**
     * 视图的类型   比如：da_record ,da_volume  等
     */

    private String type;
    /**
     * 过滤条件 如： isFiled=true and da_year='2019'
     */
    private List<FilterCondition> filterCondition;
    /**
     * 有序节点集合
     */
    private List<ViewNode> viewNodes;

    /**
     * 视图对象的完整表达 xml
     */
    private String XmlConfig;

    /**
     * 判断是否存在
     *
     * @return true 存在   false 不存在
     */
    public boolean isExist() {
        ITreeViewDao treeViewDao = ApplicationUtils.getApplicationContext().getBean(ITreeViewDao.class);
        return treeViewDao.isExist(this.getSession(), this.getName(), this.getRegion());
    }


    public boolean save() {


        if (null == this.getObjectId()) {
            //创建
            ITreeViewDao treeViewDao = ApplicationUtils.getApplicationContext().getBean(ITreeViewDao.class);
            TreeViewPO treeViewPO = new TreeViewPO();
            BeanUtils.copyProperties(this, treeViewPO);
            return treeViewDao.create(this.getSession(), treeViewPO);
        }

        return true;
    }


    public static class Builder {
        private String id = null;
        private Session session = null;

        public Builder setId(String id) {
            this.id = id;
            return this;
        }


        public Builder setSession(Session session) {
            this.session = session;
            return this;
        }

        public TreeView builder() {
            return new TreeView(this);
        }

    }


    public TreeView(Builder builder) {
        setSession(builder.session);
        this.objectId = builder.id;
        if (null == this.getSession()) {
            throw new IllegalArgumentException("session is null...");
        }

        ITreeViewDao treeViewDao = ApplicationUtils.getApplicationContext().getBean(ITreeViewDao.class);
        TreeViewPO treeViewPO = treeViewDao.getByObjectId(this.getSession(), objectId);
        if (null != treeViewPO) {
            BeanUtils.copyProperties(treeViewPO, this);
        }

    }


//关注这个方法 即可
//将对象生成xml
    public String objectToXml(){
        org.dom4j.Document document = DocumentHelper.createDocument();
        // 2、创建根节点rss
        Element root = document.addElement("viewconfig");
        // 3、向rss节点添加version属性
        root.addAttribute("fondsId", this.getFondsId());
        root.addAttribute("name", this.getName());
        root.addAttribute("objectId", this.getObjectId());
        root.addAttribute("region", this.getRegion());
        root.addAttribute("type", this.getType());
        // 4、生成子节点及子节点内容
        Element channel = root.addElement("querys");
        for (FilterCondition filterCondition1 : this.getFilterCondition()){
            Element title = channel.addElement("query");
            title.addAttribute("connector", filterCondition1.getConnector());
            title.addAttribute("field", filterCondition1.getField());
            title.addAttribute("fieldType", filterCondition1.getFieldType());
            title.addAttribute("keyWords", filterCondition1.getKeyWords());
            title.addAttribute("name", filterCondition1.getName());
            title.addAttribute("operation", filterCondition1.getOperation());
        }

        //递归创建node 节点
        int size=this.getViewNodes().size();
        ViewNode vn=this.getViewNodes().get(0);
        Element node = root.addElement("node");
        node.addAttribute("attrName", vn.getField());
        node.addAttribute("attrTitle", vn.getName());
        if(size>1){
            getChildNodes(node,1,this.getViewNodes());
        }
        return document.asXML();
    }


    /**
     * 递归 生成子节点
     * @param node
     * @param i
     * @param listNode
     */
    private static void getChildNodes(Element node, int i,List<ViewNode> listNode) {
        //size 3  i 0
        if (i<listNode.size()){
            ViewNode vn=listNode.get(i);
            Element node1 = node.addElement("node");
            node1.addAttribute("attrName", vn.getField());
            node1.addAttribute("attrTitle", vn.getName());
            i++;
            getChildNodes(node1,i,listNode);
        }
    }


}

package cn.amberdata.erms.domain.model;

import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * 过滤条件对象
 *
 * @author 
 * @see
 * @since 2019/5/13
 */

@Data
@NoArgsConstructor
public class FilterCondition {

    /**
     * 名称
     */

    private String name;

    /**
     * 字段
     */

    private String field;

    /**
     * 字段类型 如int  varchar  boolean
     */

    private String fieldType;

    /**
     * 操作符
     */

    private String operation ;
    /**
     * 关键字
     */

    private  String keyWords;
    /**
     * 连接符
     */

    private String connector;

    @Override
    public String toString() {
        String key=null;

        if (fieldType.equalsIgnoreCase("int")||fieldType.equalsIgnoreCase("boolean")){
            key=keyWords;
        }else if (fieldType.equalsIgnoreCase("varchar")){
            key="'"+keyWords+"'";
        }
        //TODO 时间的先放一下
        String str=field+operation+key+connector;
        return str;
    }

}

package cn.amberdata.erms.domain.model;

import lombok.Data;
import lombok.NoArgsConstructor;
import org.dom4j.Element;

/**
 * 视图节点
 *
 * @author 
 * @see
 * @since 2019/5/8
 */
@Data
@NoArgsConstructor
public class ViewNode {
    /**
     * 唯一标识 id
     */
    private String objectId;
    /**
     * 名称
     */
    private String name;
    /**
     * 对应的字段
     */
    private String field;

    /**
     * 根据xml 元素构造对象
     *
     * @param element 元素
     */
    public ViewNode(Element element) {
        this.name = element.attribute("attrTitle").getValue();
        this.field = element.attribute("attrName").getValue();
    }

}







xml 样例：

<?xml version="1.0" encoding="utf-8"?>