java xml转map 高级版

 

 

 

 xml文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<root>
	<classs>
		<id>001</id>
		<name>st001</name>
		<student>
			<id>0001</id>
			<name>
				<first>xue</first>
				<last>bo</last>
			</name>
		</student>
	</classs>
	<classs>
		<id>001</id>
		<name>st001</name>
		<student>
			<id>0001</id>
			<name>
				<first>xue</first>
				<last>bo</last>
			</name>
		</student>
	</classs>
</root>

 用上一篇文章中的工具转换后，再转成json的结构如下：

 

{
    "classs": [
        {
            "id": {
                "id": "001"
            },
            "student": {
                "id": {
                    "id": "0001"
                },
                "name": {
                    "last": {
                        "last": "bo"
                    },
                    "first": {
                        "first": "xue"
                    }
                }
            },
            "name": {
                "name": "st001"
            }
        },
        {
            "id": {
                "id": "001"
            },
            "student": {
                "id": {
                    "id": "0001"
                },
                "name": {
                    "last": {
                        "last": "bo"
                    },
                    "first": {
                        "first": "xue"
                    }
                }
            },
            "name": {
                "name": "st001"
            }
        }
    ]
}

 本文用最新的代码实现新的转换使结果更加理想。

代码如下：

package com.xue.tools;

import java.io.File;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import net.sf.json.JSONObject;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.Namespace;
import org.dom4j.QName;

import com.xue.tools.text.MyTextUtil;

public class Test2 {
	public static void main(String[] args) throws UnsupportedEncodingException, DocumentException {
		String textFromFile = MyTextUtil.getTextFromFile(new File("src/tt.xml"));
		Document doc = DocumentHelper.parseText(textFromFile);
		Map<String, Object> map = (Map<String, Object>) xml2map(doc.getRootElement());
		System.out.println(JSONObject.fromObject(map));
	}

	private static Object xml2map(Element element) {
		System.out.println(element);
		Map<String, Object> map = new HashMap<String, Object>();
		List<Element> elements = element.elements();
		if (elements.size() == 0) {
			map.put(element.getName(), element.getText());
			if (!element.isRootElement()) {
				return element.getText();
			}
		} else if (elements.size() == 1) {
			map.put(elements.get(0).getName(), xml2map(elements.get(0)));
		} else if (elements.size() > 1) {
			// 多个子节点的话就得考虑list的情况了，比如多个子节点有节点名称相同的
			// 构造一个map用来去重
			Map<String, Element> tempMap = new HashMap<String, Element>();
			for (Element ele : elements) {
				tempMap.put(ele.getName(), ele);
			}
			Set<String> keySet = tempMap.keySet();
			for (String string : keySet) {
				Namespace namespace = tempMap.get(string).getNamespace();
				List<Element> elements2 = element.elements(new QName(string, namespace));
				// 如果同名的数目大于1则表示要构建list
				if (elements2.size() > 1) {
					List<Object> list = new ArrayList<Object>();
					for (Element ele : elements2) {
						list.add(xml2map(ele));
					}
					map.put(string, list);
				} else {
					// 同名的数量不大于1则直接递归去
					map.put(string, xml2map(elements2.get(0)));
				}
			}
		}

		return map;
	}
}

 

结果如下：

{
    "classs": [
        {
            "id": "001",
            "student": {
                "id": "0001",
                "name": {
                    "last": "bo",
                    "first": "xue"
                }
            },
            "name": "st001"
        },
        {
            "id": "001",
            "student": {
                "id": "0001",
                "name": {
                    "last": "bo",
                    "first": "xue"
                }
            },
            "name": "st001"
        }
    ]
}