JAVA 递归解析xml

来源：http://itssh.cn/post/905.html

在日常开发中经常碰到xml解析，现提供递归解析xml类以供参考

package cn.sunmeng;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
/**
 * @ClassName: ParseXML
 * @Description: 递归解析xml
 * @author: SM（sm0210@qq.com）
 * 
 * 
 * <?xml version="1.0" encoding="UTF-8"?>
    <xml>
        <CustList>
            <TName>SMToUserName</TName>
            <FName>SMFromUserName</FName> 
            <CTime>SMCreateTime1348831860</CTime>
            <MType>SMMsgType</MType>
            <Content>SMContent</Content>
            <MId>SMMsgId1234567890123456</MId>
            <SrcLabel>SMSrcLabel</SrcLabel>
            <Code>00</Code>
    
        </CustList>
        
        <CustList>
            <TName>2SMToUserName</TName>
            <FName>2SMFromUserName</FName> 
            <CTime>2SMCreateTime1348831860</CTime>
            <MType>2SMMsgType</MType>
            <Content>2SMContent</Content>
            <MId>2SMMsgId1234567890123456</MId>
            <SrcLabel>2SMSrcLabel</SrcLabel>
            <Code>200</Code>
            
            <SMCust>
                <SM1>sm1val</SM1>
                <SM2>sm2val</SM2>
            </SMCust>
    
            <SMCust>
                <SM1>sm3val</SM1>
                <SM2>sm4val</SM2>
            </SMCust>
    
            
        </CustList>
    
        <Code>1200</Code>
        <Content>Success</Content>
    </xml>
 * 
 */
public class ParseXML {
    /**
     * @FieldName: ARRAY_PROPERTY
     * @FieldType: 数组节点
     * @Description: 数组节点
     */
    private static final List<String> ARRAY_PROPERTY = Arrays.asList(new String[]{"CustList","SMCust"});
    /**
     * 
     * @param xml
     * @param config
     * @return
     * @throws Exception
     */
    private Map<String, Object> parserXml(String xml) throws Exception {
        StringReader reader = new StringReader(xml);
        // 创建一个新的SAXBuilder
        SAXReader sb = new SAXReader();
        //
        Map<String, Object> result = new HashMap<String, Object>();
        //
        try {
            // 通过输入源构造一个Document
            Document doc = sb.read(reader);
            // 取的根元素
            Element root = doc.getRootElement();
            List children = root.elements();
            //解析xml
            result = toMap(children,null);
        } catch (Exception e) {
            System.err.print(e.getMessage());
            throw e;
        } finally {
            if(reader != null) {
                reader.close();
            }
        }
        return result;
    }
    
    /**
     * 递归解析xml，实现N层解析
     * @param xml
     */
    private Map<String, Object> toMap(List<Element> elements,List<Map<String,Object>> list){
        //
        Element el = null;
        String name = "";
        //
        Map<String, Object> map = new HashMap<String, Object>();
        //
        for(int i=0; i<elements.size();i++){
            el = (Element) elements.get(i);
            name = el.getName();
            //如果是定义成数组
            if(ARRAY_PROPERTY.contains(name)) {
                //继续递归循环
                List<Map<String,Object>> sublist = new ArrayList<Map<String,Object>>();
                //
                Map<String,Object> subMap  = this.toMap(el.elements(),sublist);
                //根据key获取是否已经存在
                Object object = map.get(name);
                //如果存在,合并
                if(object !=null ){
                    List<Map<String,Object>> olist = (List<Map<String,Object>>)object;
                    olist.add(subMap);//
                    map.put(name, olist);
                }else{//否则直接存入map
                    map.put(name, sublist);
                }
            }else {//单个值存入map
                map.put(name,el.getTextTrim());
            }
        }
        //存入list中
        if(list!=null)
            list.add(map);
        //返回结果集合
        return map;
    }

    /**
     * 读取文本文件里的xml
     * @return
     * @throws Exception
     */
    private static String readXML() throws Exception{
        //
        StringBuilder sb = new StringBuilder();
        //
        File file = new File("E:\\xml.txt");
        //
        if(file.exists() && file.isFile()){
            InputStreamReader rd = new InputStreamReader(new FileInputStream(file), "UTF-8");
            BufferedReader bufferedReader = new BufferedReader(rd);
            String str="";
            while((str = bufferedReader.readLine()) != null){
                sb.append(str);
            }
            rd.close();
        }
        //
        return sb.toString();
    }
    
    /**
     * main 方法
     * @param args
     */
    public static void main(String[] args) {
        //实例化对象
        ParseXML parseXML = new ParseXML();
        //获取xml
        String xml = new String();
        try {
            xml = parseXML.readXML();
            //解析xml
            Map<String, Object> result = parseXML.parserXml(xml);
            //打印输出
            System.out.println(result);
        } catch (Exception e) {
            //
            System.err.print(e.getMessage());
        }
    }
    
    
}

解析结果：

{
    CustList=[
        {
            FName=SMFromUserName,
            MType=SMMsgType,
            TName=SMToUserName,
            MId=SMMsgId1234567890123456,
            Content=SMContent,
            Code=00,
            SrcLabel=SMSrcLabel,
            CTime=SMCreateTime1348831860
        },
        {
            FName=2SMFromUserName,
            MType=2SMMsgType,
            TName=2SMToUserName,
            SMCust=[
                {
                    SM1=sm1val,
                    SM2=sm2val
                },
                {
                    SM1=sm3val,
                    SM2=sm4val
                }
            ],
            MId=2SMMsgId1234567890123456,
            Content=2SMContent,
            Code=200,
            SrcLabel=2SMSrcLabel,
            CTime=2SMCreateTime1348831860
        }
    ],
    Content=Success,
    Code=1200
}

来源：http://itssh.cn/post/905.html