xml字符串转字符串树

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.StringReader;import java.util.Stack;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import org.xml.sax.InputSource;import org.xml.sax.SAXException;/**  *将xml字符串转成树结构，此类所在包下应该放置一个名为string的文件，文件内容为xml格式字符串<br>  *   *  字符串<br> <operation_in><service_name></service_name><verify_code/><request_type/><sysfunc_id>10010082</sysfunc_id><trans_code/><operator_id/><organ_id>1000</organ_id><request_time/><request_seq/><request_source>100001</request_source><request_target>200001</request_target><msg_version>0100</msg_version><cont_version>0100</cont_version><content><field><name>ActionCode</name><id>0</id><simple>QUERYOFFER</simple></field><field><name>Mobile</name><id>0</id><simple>15210939334</simple></field><field><name>Source</name><id>0</id><simple>WEB3</simple></field><field><name>UserTime</name><id>0</id><simple>09/06/2015 16:58:24</simple></field><field><name>FIELD1</name><id>0</id><simple>111002000047</simple></field></content></operation_in>的转换结果为<br>operation_in|       |-------service_name······························<br>|       |-------verify_code·······························<br>|       |-------request_type······························<br>|       |-------sysfunc_id································10010082<br>|       |-------trans_code································<br>|       |-------operator_id·······························<br>|       |-------organ_id··································1000<br>|       |-------request_time······························<br>|       |-------request_seq·······························<br>|       |-------request_source····························100001<br>|       |-------request_target····························200001<br>|       |-------msg_version·······························0100<br>|       |-------cont_version······························0100<br>|       |-------content<br>|       |       |       |-------field<br>|       |       |       |       |       |-------name······················ActionCode<br>|       |       |       |       |       |-------id························0<br>|       |       |       |       |       |-------simple····················QUERYOFFER<br>|       |       |       |-------field<br>|       |       |       |       |       |-------name······················Mobile<br>|       |       |       |       |       |-------id························0<br>|       |       |       |       |       |-------simple····················15210939334<br>|       |       |       |-------field<br>|       |       |       |       |       |-------name······················Source<br>|       |       |       |       |       |-------id························0<br>|       |       |       |       |       |-------simple····················WEB3<br>|       |       |       |-------field<br>|       |       |       |       |       |-------name······················UserTime<br>|       |       |       |       |       |-------id························0<br>|       |       |       |       |       |-------simple····················09/06/2015 16:58:24<br>|       |       |       |-------field<br>|       |       |       |       |       |-------name······················FIELD1<br>|       |       |       |       |       |-------id························0<br>|       |       |       |       |       |-------simple····················111002000047<br> */public class Main {final static String depthStr="|       ";final static String nodeStr="|-------";final static String line="\n";final static char valueSpliter='·';final static int VALUE_START_POSITION=33;//调节显示节点值的位置public static void main(String[] args) throws IOException {//此类所在的包下有一个名叫string的文件，里面存放xml格式的报文InputStream stream=Main.class.getClassLoader().getResourceAsStream("cn/com/lewis/xml2tree/string");BufferedReader br=null;try {br = new BufferedReader(new InputStreamReader(stream,"GBK"));StringBuilder builder=new StringBuilder();String tmp=null;while((tmp=br.readLine())!=null){builder.append(tmp);}System.out.println(xmlToTree(builder.toString()));} catch (IOException | ParserConfigurationException | SAXException e1) {e1.printStackTrace();}finally{if(br!=null){br.close();}}}/** * 转换函数，非递归方式的实现 * @param document * @return * @throws ParserConfigurationException  * @throws IOException  * @throws SAXException  */public static String xmlToTree(String reqStr) throws ParserConfigurationException, SAXException, IOException{DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();DocumentBuilder db = dbf.newDocumentBuilder();StringReader sr = new StringReader(reqStr);Document document=db.parse(new InputSource(sr));Element root=document.getDocumentElement();NodeList iterator=root.getChildNodes();Stack<StackItem<Integer>> stack=new Stack<StackItem<Integer>>();int j=0;StringBuilder builder=new StringBuilder(root.getNodeName()+line);Integer depth=0;//此处必须是对象，因为泛型要取匹配类型do{for(;j<iterator.getLength();j++){Node childNode = iterator.item(j);if(childNode.getNodeType() == Node.ELEMENT_NODE){StringBuilder tmpBuilder=new StringBuilder();for(int ii=0;ii<depth;++ii){builder.append(depthStr);tmpBuilder.append(depthStr);}builder.append(depthStr).append(line).append(tmpBuilder).append(nodeStr).append(childNode.getNodeName());if(childNode.getChildNodes().getLength()==0||(childNode.getChildNodes().getLength()==1&&childNode.getChildNodes().item(0).getNodeType() != Node.ELEMENT_NODE) ){int chc=depthStr.length()*depth+nodeStr.length()+childNode.getNodeName().length();for(int ii=0;ii<VALUE_START_POSITION-chc;++ii){builder.append(valueSpliter);}builder.append("示例值：").append(childNode.getTextContent());}else{stack.push(new StackItem<Integer>(iterator,j+1,depth));depth=new Integer(depth.intValue()+1);//防止编译时优化成对象自增j=-1;//j++后值变成0,获取下级节点的首子节点iterator=childNode.getChildNodes();}builder.append(line);}}if(stack.isEmpty()){break;}StackItem<Integer> topItem=stack.pop();iterator=topItem.iterator;j=topItem.index;depth=topItem.cacheObject;}while(true);return builder.toString();}/** *  * * @param <T> */static class StackItem<T> {/** * 迭代到的xml节点 */public NodeList iterator;/** * 迭代到的序号 */public int index;/** * 附加的数据 */public T cacheObject;public StackItem(NodeList iterator, int index, T cacheObject) {super();this.iterator = iterator;this.index = index;this.cacheObject = cacheObject;}public StackItem() {super();}}}