xml文件流与javabean之间的通用转换(上)
最近在做通讯方面的一些东西，移动端与服务器之间的通讯采用HttpUrlConnection以xml文件流的方式进行通讯。xml文件解析后，通常要给对应的数据模型(javabean)赋值，从而进行一些列的验证，入库，日志操作等。
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1、通过HttpUrlConnection获取输入流，解码后生成xml文件字符串
2、使用dom4j解析此字符串生成Document对象
3、对Document对象递归遍历收集节点名称和节点值，并根据节点名称拼接set方法，用以和javabean反射后得到的set方法做匹配
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具体代码如下：
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1、模拟客户端发送xml数据流至服务器 Client.java
import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import java.net.URLEncoder;import java.net.URLDecoder;public class Client {private static final String POST = "http://localhost:8080/mobileCharge/charge/chargeAction!getMpay.action";public static void main(String[] args){sendXml();}public static String createXml() {String xml = "<?xml version="1.0" encoding="UTF-8"?>" + "<mpay>"+ "<methodName>getMpay</methodName>" + "<params>" + "<param>"+ "<type>1</type>" + "<terminalid>91300021</terminalid>"+ "<money>100.00</money>" + "<csn>02570001</csn>"+ "<password>1f3259007db02194cd134f18513dd00e</password>"+ "</param>" + "</params>" + "</mpay>";return xml;}public static void sendXml(){try {URL url = new URL(POST);//根据Url地址打开一个连接URLConnection urlConnection = url.openConnection();HttpURLConnection httpUrlConnection = (HttpURLConnection)urlConnection;//允许输出流httpUrlConnection.setDoOutput(true);//允许写入流httpUrlConnection.setDoInput(true);//post方式提交不可以使用缓存httpUrlConnection.setUseCaches(false);//请求类型httpUrlConnection.setRequestProperty("Content-Type", "text/html");httpUrlConnection.setRequestMethod("POST");//设置连接、读取超时httpUrlConnection.setConnectTimeout(30000);httpUrlConnection.setReadTimeout(30000);httpUrlConnection.connect();//使用缓冲流将xml字符串发送给服务器BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(httpUrlConnection.getOutputStream()));writer.write(URLEncoder.encode(createXml(),"UTF-8"));writer.flush();writer.close();writer = null;//关闭连接httpUrlConnection.disconnect();} catch (MalformedURLException e) {e.printStackTrace();} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}}?
2、服务端获取到此输入流后转换为字符串，这个很简单，贴出主要代码即可
public String getXmlText(){//使用的是struts2 ，获取request很方便 O(∩_∩)O~HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(StrutsStatics.HTTP_REQUEST);String xmlText=null;try{//同样使用缓冲流BufferedReader reader = new BufferedReader(new InputStreamReader(request.getInputStream()));StringBuffer sb = new StringBuffer();String lines;while((lines = reader.readLine())!=null){sb.append(lines);}//客户端使用了UTF-8编码，这里使用同样使用UTF-8解码xmlText = URLDecoder.decode(sb.toString(),"UTF-8");reader.close();reader = null;}catch(Exception e){e.printStackTrace();}return xmlText;}?
?一下就是xmlText与javabean之间的转换了，今天只写了上部分 xml - javabean? 改天再写下部分 javabean - xml
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3、xmlText -? javabean 的转换
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/** * 根据xml文件流对xmlModel赋值 * @param xmlText * @param xmlModel * @return */@SuppressWarnings("unchecked")public static synchronized Object parseXml4Bean(String xmlText,Object xmlModel){try {//解析字符串生成docment对象Document xmlDoc = DocumentHelper.parseText(xmlText);//获取根节点Element element = xmlDoc.getRootElement();List<Map<String,String>> propsList = new ArrayList<Map<String,String>>();//解析xml中的节点名称和节点值，详细见下面parseXmlpropsList = parseXml(element, propsList);if(propsList.size()==0){return null;}//获取Method对象数组Method[] methods = xmlModel.getClass().getDeclaredMethods();for(int i=0;i<propsList.size();i++){for(int j=0;j<methods.length;j++){Method m = methods[j];if(propsList.get(i).containsKey(m.getName())){try {//执行set方法，将xml中的textNode值赋予Model中m.invoke(xmlModel, new Object[]{propsList.get(i).get(m.getName())});} catch (Exception e) {e.printStackTrace();}}}}} catch (DocumentException e) {e.printStackTrace();}return xmlModel;}?
?4、子方法 ，用以解析xml，拼接set方法匹配与Method数组
/** * 获取xml文件中叶结点名称和节点值 * @param element * @param propsList * @return */@SuppressWarnings("unchecked")private static List<Map<String,String>> parseXml(Element element,List<Map<String,String>> propsList){if(element.isTextOnly()){HashMap<String,String> map = new HashMap<String,String>();String key = element.getName();key = METHOD_SET+key.substring(0,1).toUpperCase().concat(key.substring(1,key.length()));map.put(key,element.getTextTrim());propsList.add(map);}else{List<Element> tmpList = element.elements();for(Element e : tmpList){parseXml(e, propsList);}}return propsList;}?
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?5、java bean
package com.eptok.business.charge;public class ChargeXmlModel {private String methodName;private String type;private String terminalid;private String money;private String csn;private String password;public String getMethodName() {return methodName;}public void setMethodName(String methodName) {this.methodName = methodName;}public String getType() {return type;}public void setType(String type) {this.type = type;}public String getTerminalid() {return terminalid;}public void setTerminalid(String terminalid) {this.terminalid = terminalid;}public String getMoney() {return money;}public void setMoney(String money) {this.money = money;}public String getCsn() {return csn;}public void setCsn(String csn) {this.csn = csn;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}}?
6、测试调用?? 。。。。
?附件中有dom4j的jar ，可以下载
package main;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.FileReader;import javax.xml.bind.JAXBContext;import javax.xml.bind.JAXBException;import javax.xml.bind.Marshaller;import javax.xml.bind.Unmarshaller;import demo.model.Person;public class Main {/** * @param args * @throws JAXBException * @throws FileNotFoundException */public static void main(String[] args) throws JAXBException, FileNotFoundException {JAXBContext ctx=JAXBContext.newInstance(Person.class);toXML(ctx);fromXML(ctx);}public static void toXML(JAXBContext ctx) throws JAXBException, FileNotFoundException{Marshaller ms=ctx.createMarshaller();FileOutputStream fo=new FileOutputStream(new File("src/Person.xml"));Person p=new Person();//"Jack","12";p.age="ss";ms.marshal(p, fo);}public static void fromXML(JAXBContext ctx) throws FileNotFoundException, JAXBException{FileReader fo=new FileReader(new File("src/Person.xml"));Unmarshaller ums= ctx.createUnmarshaller();Person p=(Person) ums.unmarshal(fo);System.out.println(p.username);}}package demo.model;import javax.xml.bind.annotation.XmlAttribute;import javax.xml.bind.annotation.XmlRootElement;@XmlRootElementpublic class Person {public Person() {super();}public Person(String username, String age) {super();this.username = username;this.age = age;}@XmlAttributepublic String username;public String age;}