Java中 xml 转成 List 集合

灰太狼 2023-01-22 11:49 17阅读 0赞

将Xml部分内容转为List<实体类>并且实体类属性不仅仅局限于String类型。

## 接收实体类 ##

public class InventoryQueryReturn{
    	
    	// 商品编码，string（50），必填
    	private String itemCode;
    	// 未冻结库存数量，int，必填
    	private String quantity;
    	// 冻结库存数量，int，必填
    	private String lockQuantity;
    	
    	@Override
    	public String toString() {
    		return "InventoryQueryReturn [itemCode=" + itemCode + ", quantity=" + quantity + ", lockQuantity="
    				+ lockQuantity + "]";
    	}
    	// get set方法
    }

## 转换工具类 ##

import java.io.ByteArrayInputStream;
    import java.lang.reflect.Field;
    import java.lang.reflect.Method;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Date;
    import java.util.Iterator;
    import java.util.List;
     
    import org.dom4j.io.SAXReader;
    import org.xml.sax.InputSource;
     
    public class QueryResult {
    	
    	/**
    	 * 解析XML多节点内容为List集合
    	 * @param tr2 将要解析为List集合的节点
    	 * @param s XML格式的字符串
    	 * @param clazz 接收实体类
    	 * @return
    	 */
    	public static List<Object> readXMLToList(String tr2, String s, Class<?> clazz) {
     
    	    List<Object> list = new ArrayList();//创建list集合
    	    try {
    	        //1.创建一个SAXBuilder的对象
    	        SAXReader reader = new SAXReader();
    			// 指定编码格式为UTF-8,可根据具体情况修改
    	        org.dom4j.Document doc = reader.read(new InputSource(new ByteArrayInputStream(s.getBytes("UTF-8"))));//dom4j读取
    	        // 4.通过document对象获取xml文件的根节点
    	        org.dom4j.Element root = doc.getRootElement();//获得根节点
    	        // 5. 获取根节点下的子节点items,即要解析XML多节点的父节点，可根据具体情况修改
    	        org.dom4j.Element body = root.element("items");
    	        // 6. 获取根节点下的二级节点
    	        org.dom4j.Element foo;
    	        for (Iterator i = body.elementIterator(tr2); i.hasNext();) {//遍历t.getClass().getSimpleName()节点
    	            foo = (org.dom4j.Element) i.next();//下一个二级节点
    	            //实例化Object对象
    	            Object obj = clazz.newInstance();
    	            Field[] properties = obj.getClass().getDeclaredFields();//获得实例的属性
    	            //实例的get方法
    	            Method getmeth;
    	            //实例的set方法
    	            Method setmeth;
    	            //遍历实体类的属性
    	            for (int j = 0; j < properties.length; j++) {
    	                //实例的set方法
    	                if (properties[j].getName().equals("serialVersionUID")) {
    	                    continue;
    	                } else {
    	                    setmeth = obj.getClass().getMethod(
    	                            "set"
    	                                    + properties[j].getName().substring(0, 1).toUpperCase()
    	                                    + properties[j].getName().substring(1), properties[j].getType());
    	                    Object setStr = foo.elementText(properties[j].getName());
     
    	                    if (foo.elementText(properties[j].getName()) != null&&!"".equals(foo.elementText(properties[j].getName()))) {
    	                        if (properties[j].getType() == java.util.Date.class) {
    	                            SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    	                            Date sj = df.parse(foo.elementText(properties[j].getName()));
    	                            setStr = sj;
    	                        } else if (properties[j].getType() == java.lang.Integer.class) {
    	                            setStr = Integer.parseInt(foo.elementText(properties[j].getName()));
    	                        } else if (properties[j].getType() == java.lang.Character.class) {
    	                            setStr = foo.elementText(properties[j].getName()).charAt(0);
    	                        }else if (properties[j].getType() == java.lang.Double.class) {
    	                            setStr = Double.parseDouble(foo.elementText(properties[j].getName()));
    	                        }
    	                    } else {
    	                        setStr = null;
    	                    }
    	                    //将对应节点的值存入
    	                    setmeth.invoke(obj, setStr);
    	                }
    	            }
    	            list.add(obj);
    	        }
    	    } catch (Exception e) {
    	        e.printStackTrace();
    	    }
    	    return list;
    	}
    }

## 结果测试类 ##

public static void main(String[] args) {
    		// TODO 自动生成的方法存根
    		String flag="<response><flag>success</flag><code>hc-000</code><message>接收成功!</message><items><item><warehouseCode>41</warehouseCode><itemCode>4901301269348</itemCode><itemId>4133189609B21014140520893071772</itemId><inventoryType>ZP</inventoryType><imperfectGrade/><quantity>264</quantity><lockQuantity>0</lockQuantity></item><item><warehouseCode>41</warehouseCode><itemCode>4901301236203</itemCode><itemId>4133189609B21014140520893071773</itemId><inventoryType>ZP</inventoryType><imperfectGrade/><quantity>480</quantity><lockQuantity>0</lockQuantity></item></items></response>";
    		List<Object> items = QueryResult.readXMLToList("item", flag, InventoryQueryReturn.class);
    		List<InventoryQueryReturn> list = new ArrayList<InventoryQueryReturn>();
    		for (int i = 0; i < items.size(); i++) {
    		//将List<Object>转为对应的实体类
    			list.add((InventoryQueryReturn) items.get(i));
    		}
    		for (int a = 0; a < list.size(); a++) {
    		   
    			System.out.println("_______________________" + list.get(a).toString());
    		}
     
    	}

## 解析结果  ##

![20191025160618821.png][]

## 借鉴 ##

[https://www.cnblogs.com/514929hgy/p/9124761.html][https_www.cnblogs.com_514929hgy_p_9124761.html]

[https://www.cnblogs.com/514929hgy/p/9143182.html][https_www.cnblogs.com_514929hgy_p_9143182.html]

[https://blog.csdn.net/xin6yang/article/details/102708334][https_blog.csdn.net_xin6yang_article_details_102708334]

[20191025160618821.png]: /images/20221020/468f0077832b4356a3900decf96f3718.png
[https_www.cnblogs.com_514929hgy_p_9124761.html]: https://www.cnblogs.com/514929hgy/p/9124761.html
[https_www.cnblogs.com_514929hgy_p_9143182.html]: https://www.cnblogs.com/514929hgy/p/9143182.html
[https_blog.csdn.net_xin6yang_article_details_102708334]: https://blog.csdn.net/xin6yang/article/details/102708334