[工作代码]dom4j解析实例

工作中，我需要和另一个公司(A公司)共同开发一个模块，我写一个servlet接口，A公司携带xml格式的报文来访问。我采用流的形式读取，在处理后以流的形式写入，在返回(相应)给A公司。

demo:

 package com.sinosoft.undwrt.bl.facade;

 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.StringBufferInputStream;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;

 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.xml.parsers.FactoryConfigurationError;
 import javax.xml.parsers.ParserConfigurationException;

 import org.dom4j.Document;
 import org.dom4j.DocumentException;
 import org.dom4j.Element;
 import org.dom4j.io.SAXReader;
 import org.xml.sax.SAXException;

 import com.sinosoft.sysframework.reference.DBManager;
 import com.sinosoft.utiall.schema.PrpDriskSchema;
 import com.sinosoft.utility.error.UserException;

 public class CheckIfPassFacade extends HttpServlet {

     /**
      * Destruction of the servlet. <br>
      */
     public void destroy() {
         super.destroy(); // Just puts "destroy" string in log
         // Put your code here
     }

     /**
      * The doGet method of the servlet. <br>
      *
      * This method is called when a form has its tag value method equals to get.
      *
      * @param request the request send by the client to the server
      * @param response the response send by the server to the client
      * @throws ServletException if an error occurred
      * @throws IOException if an error occurred
      */
     public void doGet(HttpServletRequest request, HttpServletResponse response)
             throws ServletException, IOException {

        doPost(request, response);
     }

     /**
      * @param request the request send by the client to the server
      * @param response the response send by the server to the client
      * @throws ServletException if an error occurred
      * @throws IOException if an error occurred
      * @author yaowengang
      * @time 2016-1-26
      * @desc 共享平台访问此servlet，以流的形式返回passFlag(是否审核通过true or false),passTime(审核通过时间),undwrter(审核通过人)
      * @desc underwriteflag  1审核通过，9提交到核赔/核保(在双核或共享平台)，6注销，
                              2下发修改，0暂存(在核心) ；
                              3自动核保(自核单子审核通过后)；4无需核保(自核单子审核通过前的标识)
      */
     public void doPost(HttpServletRequest request, HttpServletResponse response)
             throws ServletException, IOException {
         String[] arrs= analyzeXML(request);
         //获取指定元素的内容
         String taskId= arrs[0];//businessNo
         String businessType= arrs[1];

         boolean isT= businessType.equals("T")?  true:  false;
         DBManager dbManager = new DBManager();
         List list= new ArrayList<String>();
         ResultSet resultSet= null;
         String underwriteFlag= null;
         String passTime= null;
         Boolean passFlag= null ;//true:审核通过，false:未审核通过
         String undwrter =null;//核保人
         BufferedOutputStream ou= null;
         try {
             if (taskId!=null&&!"".equals(taskId)) {
 //                boolean isT= taskId.startsWith("T") ? true :false ;//需要改，让平台作为参数传给我
                 dbManager.open("ddccDataSource");
                 if (isT) {//投保单
                     String sqlT= "select underwriteflag,passtime,underwritecode from prptmain where proposalno=?";
                     dbManager.prepareStatement(sqlT);
                     dbManager.setString(1, taskId);
                     resultSet = dbManager.executePreparedQuery();
                     while (resultSet.next()) {
                         underwriteFlag= resultSet.getString("underwriteflag");
                         passTime= resultSet.getString("passtime");
                         undwrter= resultSet.getString("underwritecode");
                         passFlag= underwriteFlag.equals("1");
                         if (!passFlag) {
                             passTime=null;
                             undwrter=null;
                         }
                         break;
                     }
                     /*if (passFlag) {
                         resultSet= null;
                         String sql2= "select passtime,underwritecode from prptmain where proposalno=?";
                         dbManager.prepareStatement(sql2);
                         dbManager.setString(1, taskId);
                         resultSet = dbManager.executePreparedQuery();
                         while (resultSet.next()) {
                             passTime= resultSet.getString("passtime");
                             undwrter= resultSet.getString("underwritecode");
                             break;
                         }
                         if (passTime==null) {
                                passTime="";
                         }
                     }*/

                 }else {//批单
                     String sqlP= "select underwriteflag,passtime,underwritecode from prpphead where endorseno=?";
                     dbManager.prepareStatement(sqlP);
                     dbManager.setString(1, taskId);
                     resultSet = dbManager.executePreparedQuery();
                     while (resultSet.next()) {
                         underwriteFlag= resultSet.getString("underwriteflag");
                         passTime= resultSet.getString("passtime");
                         undwrter= resultSet.getString("underwritecode");
                         passFlag= underwriteFlag.equals("1");
                         if (!passFlag) {
                             passTime=null;
                             undwrter=null;
                         }
                         /*passTime= resultSet.getString("passtime");
                         undwrter= resultSet.getString("underwritecode");*/
                         /*if (passTime==null) {
                                passTime="";
                         }*/
                         break;
                     }
                     /*if (passFlag) {
                         resultSet= null;
                         String sql2= "select passtime,underwritecode from prpphead where endorseno=?";
                         dbManager.prepareStatement(sql2);
                         dbManager.setString(1, taskId);
                         resultSet = dbManager.executePreparedQuery();
                         while (resultSet.next()) {
                             passTime= resultSet.getString("passtime");
                             undwrter= resultSet.getString("underwritecode");
                             break;
                         }
                         if (passTime==null) {
                                passTime="";
                         }
                     }*/
                 }

             }else {
                 throw new Exception("解析报文失败!请检查报文是否正确。");
             }

             list.add(""+passFlag);
             list.add(passTime);
             list.add(undwrter);
             String resultXML= assembleXML(list);
             System.out.println("给平台返回的xml :"+resultXML);
             ou = new BufferedOutputStream(response.getOutputStream());
             ou.write(resultXML.getBytes());
             ou.flush();
             ou.close();
         }catch (IOException e1) {
             e1.printStackTrace();
         }catch (SQLException e2) {
             e2.printStackTrace();
         } catch (Exception e) {
             e.printStackTrace();
         }finally{
             if (dbManager!=null) {
                 try {
                     dbManager.close();
                 } catch (Exception e) {
                     e.printStackTrace();
                 }
             }
         }
     }

     /**
      * Initialization of the servlet. <br>
      *
      * @throws ServletException if an error occurs
      */
     public void init() throws ServletException {
         // Put your code here
     }

     /**
      * @desc 将查询所得数据构造成xml格式，便于传送
      * @param
      * @throws UserException, ParserConfigurationException, FactoryConfigurationError, SAXException,Exception
      */
     public String assembleXML(List<String> list) throws UserException, ParserConfigurationException, FactoryConfigurationError, SAXException,Exception {
         StringBuilder strBuilder = new StringBuilder();
         strBuilder.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
         strBuilder.append("<ROOT>");
         strBuilder.append("<HEAD>");
         strBuilder.append("<INFO>");
         strBuilder.append("<PASSFLAG>"+ list.get(0)+ "</PASSFLAG>");
         strBuilder.append("<PASSTIME>"+ list.get(1)+ "</PASSTIME>");
         strBuilder.append("<UNDWRTER>"+ list.get(2)+ "</UNDWRTER>");
         strBuilder.append("</INFO>");
         strBuilder.append("</HEAD>");
         strBuilder.append("</ROOT>");
         return strBuilder.toString();
     }

     /**
      * @desc dom4j框架解析来自request的报文
      * @author yaowengang
      * @throws IOException
      * @date 20160224
      * */
     public String[] analyzeXML(HttpServletRequest request) throws IOException   {//

         String[] datas= new String[2];
         InputStream XMLInputStream= request.getInputStream();
         BufferedReader XMLBuffReader= new BufferedReader(new InputStreamReader(XMLInputStream));
         StringBuilder requestXMLSB= new StringBuilder("");
         InputStream in= null;
         try {
             String tempXML;
             while (true) {
                 tempXML= XMLBuffReader.readLine();
                 if (tempXML==null) {
                     break;
                 }
                 requestXMLSB.append(tempXML);
             }
             String requestXML= requestXMLSB.toString();
             System.out.println("平台发的报文  :"+requestXML);
             //解析收到的报文--采用dom4j框架
             in= new StringBufferInputStream(requestXML);
             SAXReader saxReader= new SAXReader();
             Document document= null;
             document = saxReader.read(in);
             //获取根元素
             Element root= document.getRootElement();
             Element headElement=  root.element("HEAD");
             Element infoElement= headElement.element("INFO");
             Element businessNoElement= infoElement.element("BUSINESSNO");
             Element businessTypeElement= infoElement.element("BUSINESSTYPE");
             //获取指定元素的内容
             String businessNo= businessNoElement.getText();
             String businessType= businessTypeElement.getText();
             datas[0]= businessNo;
             datas[1]= businessType;

         }catch (DocumentException e1) {
             e1.printStackTrace();
         } catch (Exception e) {
             e.printStackTrace();
         }finally{
             if (XMLBuffReader!=null) {
                 XMLBuffReader.close();
             }
             if (in!=null) {
                 in.close();
             }
         }
         return datas;
     } 

 }