BlogJava-执着的笨蛋-随笔分类-xmlhttp://www.blogjava.net/lcs/category/26137.html黑暗的SH！灰暗的人生！证明了我的心中还有一些光明！ zh-cnThu, 14 Feb 2008 08:28:24 GMTThu, 14 Feb 2008 08:28:24 GMT60在Java中写文件的中文问题[转]http://www.blogjava.net/lcs/archive/2008/02/14/179922.htmllklkThu, 14 Feb 2008 06:20:00 GMThttp://www.blogjava.net/lcs/archive/2008/02/14/179922.htmlhttp://www.blogjava.net/lcs/comments/179922.htmlhttp://www.blogjava.net/lcs/archive/2008/02/14/179922.html#Feedback0http://www.blogjava.net/lcs/comments/commentRss/179922.htmlhttp://www.blogjava.net/lcs/services/trackbacks/179922.html写出来的文件用浏览器打开后都是乱码。已经在XML的最前面加上了
<?xml version="1.0" encoding="UTF-8"?>
而且浏览器的编码也是UTF-8的，这就排除了浏览器的问题。
再用VIM打开，发现用GB2312看是没问题的，换成:set encoding=UTF-8以后开始乱码
这时我尝试将字符串转码后写入文件，但在UTF-8，GBK和ISO8859_1中间怎么转也没有用。
忽然想起前几天yiyayoyo同学和我提过Java写文件默认编码的问题，于是开始google，发现我用的写文件的方式无法指定编码，于是换用另一种写文件的方式指定UTF-8，遂搞定。代码如下：

老代码：
PrintWriter pw = new PrintWriter(new FileWriter(path));
pw.print(content);
pw.close();

新代码：
FileOutputStream fos = new FileOutputStream(path);
Writer out = new OutputStreamWriter(fos, "UTF-8");
out.write(content);
out.close();
fos.close();

顺便抱怨一句，Java中写文件的方式还真是多阿多……我等一两年经验的小程序员看了都眼晕

   库卡 说：
  读代码也有编码的问题，如果要读取UTF-8的文件，应采用如下方式覆盖默认编码：
  FileInputStream fis = new FileInputStream(s);
  StringBuffer content = new StringBuffer();
  DataInputStream in = new DataInputStream(fis);
  BufferedReader d = new BufferedReader(new InputStreamReader(in, "UTF-8"));
  String line = null;
   while ((line = d.readLine()) != null)
                      content.append(line + "\n");
  d.close();
  in.close();
  fis.close();



lk 2008-02-14 14:20 发表评论
]]>利用XMLBean轻轻松松读写XML http://www.blogjava.net/lcs/archive/2007/11/22/162316.htmllklkThu, 22 Nov 2007 03:08:00 GMThttp://www.blogjava.net/lcs/archive/2007/11/22/162316.htmlhttp://www.blogjava.net/lcs/comments/162316.htmlhttp://www.blogjava.net/lcs/archive/2007/11/22/162316.html#Feedback1http://www.blogjava.net/lcs/comments/commentRss/162316.htmlhttp://www.blogjava.net/lcs/services/trackbacks/162316.html 

利用XMLBean轻轻松松读写XML

作者：叶枫




版权声明：本文可以自由转载，转载时请务必以超链接形式标明文章原始出处和作者信息及本声明
作者:叶枫(http://blog.matrix.org.cn/page/叶枫)
原文:[http://www.matrix.org.cn/resource/article/44/44027_XMLBean.html]http://www.matrix.org.cn/resource/article/44/44027_XMLBean.html[/url]
关键字:XML XMLBean Parser

一、关于XML解析

  XML在Java应用程序里变得越来越重要, 广泛应用于数据存储和
交换. 比如我们常见的配置文件,都是以XML方式存储的. XML还应用
于Java Message Service和Web Services等技术作为数据交换.
因此,正确读写XML文档是XML应用的基础.
  Java提供了SAX和DOM两种方式用于解析XML,但即便如此,要读写一个
稍微复杂的XML,也不是一件容易的事.

二、XMLBean简介

    Hibernate已经成为目前流行的面向Java环境的对象/关系数据库映射工具.
在Hibernate等对象/关系数据库映射工具出现之前,对数据库的操作是
通过JDBC来实现的,对数据库的任何操作,开发人员都要自己写SQL语句
来实现. 对象/关系数据库映射工具出现后,对数据库的操作转成对
JavaBean的操作,极大方便了数据库开发. 所以如果有一个类似的工具能够
实现将对XML的读写转成对JavaBean的操作,将会简化XML的读写,即使对XML
不熟悉的开发人员也能方便地读写XML. 这个工具就是XMLBean.

三、准备XMLBean和XML文档

   XMLBean是Apache的一个开源项目,可以从http://www.apache.org下载,
最新的版本是2.0. 解压后目录如下:
xmlbean2.0.0
     +---bin
     +---docs
     +---lib
     +---samples
     +---schemas

另外还要准备一个XML文档(customers.xml),
在本文的例子里,我们将对这个文档进行读写操作. 文档源码如下:


<?xml version="1.0" encoding="UTF-8"?>

<Customers>

    <customer>

            <id>1</id>

            <gender>female</gender>

            <firstname>Jessica</firstname>

            <lastname>Lim</lastname>

            <phoneNumber>1234567</phoneNumber>

            <address>

                <primaryAddress>

                        <postalCode>350106</postalCode>

                        <addressLine1>#25-1</addressLine1>

                        <addressLine2>SHINSAYAMA 2-CHOME</addressLine2>

                </primaryAddress>

                <billingAddress>

                        <receiver>Ms Danielle</receiver>

                        <postalCode>350107</postalCode>

                        <addressLine1>#167</addressLine1>

                        <addressLine2>NORTH TOWER HARBOUR CITY</addressLine2>

                </billingAddress>

            </address>

    </customer>

    <customer>

            <id>2</id>

            <gender>male</gender>

            <firstname>David</firstname>

            <lastname>Bill</lastname>

            <phoneNumber>808182</phoneNumber>

            <address>

                <primaryAddress>

                        <postalCode>319087</postalCode>

                        <addressLine1>1033 WS St.</addressLine1>

                        <addressLine2>Tima Road</addressLine2>

                </primaryAddress>

                <billingAddress>

                        <receiver>Mr William</receiver>

                        <postalCode>672993</postalCode>

                        <addressLine1>1033 WS St.</addressLine1>

                        <addressLine2>Tima Road</addressLine2>

                </billingAddress>

            </address>

    </customer>

</Customers>


这是一个客户的数据模型,每个客户都有客户编号(ID),姓名,性别(gender),
电话号码(phoneNumber)和地址,其中地址有两个: 首要地址(PrimaryAddress)
和帐单地址(BillingAddress),每个地址有邮编,地址1,和地址2组成.
其中帐单地址还有收件人(receiver).

    此外,还要准备一个配置文件(文件名customer.xsdconfig),这个文件的
作用我后面会讲,它的内容如下:


<xb:config xmlns:xb="http://xml.apache.org/xmlbeans/2004/02/xbean/config">



  <xb:namespace>

    <xb:package>sample.xmlbean</xb:package>

  </xb:namespace>



</xb:config>


四、XMLBean使用步骤

    和其他面向Java环境的对象/关系数据库映射工具的使用步骤一样,
在正式使用XMLBean前,我们要作两个准备.

    1. 生成XML Schema文件

       什么是XML Schema文件? 正常情况下,每个XML文件都有一个Schema文件,
       XML Schema文件是一个XML的约束文件,它定义了XML文件的结构和元素.
       以及对元素和结构的约束. 通俗地讲,如果说XML文件是数据库里的记录,
       那么Schema就是表结构定义.

       为什么需要这个文件? XMLBean需要通过这个文件知道一个XML文件的
       结构以及约束,比如数据类型等. 利用这个Schema文件,XMLBean将会产生
       一系列相关的Java Classes来实现对XML的操作. 而作为开发人员,则是
       利用XMLBean产生的Java Classes来完成对XML的操作而不需要SAX或DOM.

       怎样产生这个Schema文件呢? 如果对于熟悉XML的开发人员,可以自己来
       写这个Schema文件,对于不熟悉XML的开发人员,可以通过一些工具来完成.
       比较有名的如XMLSPY和Stylus Studio都可以通过XML文件来生成Schema
       文件. 加入我们已经生成这个Schema文件(customer.xsd):
       


       <?xml version="1.0" encoding="UTF-8"?>

       <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"

                  elementFormDefault="qualified">

         <xs:element name="Customers">

           <xs:complexType>

             <xs:sequence>

               <xs:element maxOccurs="unbounded" name="customer"

                           type="customerType"/>

             </xs:sequence>

           </xs:complexType>

         </xs:element>

       <xs:complexType name="customerType">

             <xs:sequence>

               <xs:element name="id" type="xs:int"/>

               <xs:element name="gender" type="xs:string"/>

               <xs:element name="firstname" type="xs:string"/>

               <xs:element name="lastname" type="xs:string"/>

               <xs:element name="phoneNumber" type="xs:string"/>

               <xs:element name="address" type="addressType"/>

             </xs:sequence>

       </xs:complexType>

         <xs:complexType name="addressType">

             <xs:sequence>

               <xs:element name="primaryAddress" type="primaryAddressType"/>

               <xs:element name="billingAddress" type="billingAddressType"/>

             </xs:sequence>

         </xs:complexType>



         <xs:complexType name="primaryAddressType">

             <xs:sequence>

               <xs:element name="postalCode" type="xs:string"/>

               <xs:element name="addressLine1" type="xs:string"/>

               <xs:element name="addressLine2" type="xs:string"/>

             </xs:sequence>

         </xs:complexType>

         <xs:complexType name="billingAddressType">

             <xs:sequence>

                   <xs:element name="receiver" type="xs:string"/>

               <xs:element name="postalCode" type="xs:string"/>

               <xs:element name="addressLine1" type="xs:string"/>

               <xs:element name="addressLine2" type="xs:string"/>

             </xs:sequence>

         </xs:complexType>

       </xs:schema>

      


    2. 利用scomp来生成Java Classes

       scomp是XMLBean提供的一个编译工具,它在bin的目录下. 通过这个工具,
       我们可以将以上的Schema文件生成Java Classes.
       scomp的语法如下:-

       


       scomp [options] [dirs]* [schemaFile.xsd]* [service.wsdl]* [config.xsdconfig]*

      


       主要参数说明:
       -src [dir]                  -- 生成的Java Classes存放目录
     -srconly                  -- 不编译Java Classes,不产生Jar文件
     -out [jarFileName]  -- 生成的Jar文件,缺省是xmltypes.jar
       -compiler                 -- Java编译器的路径,即Javac的位置
       schemaFile.xsd    -- XML Schema文件位置
       config.xsdconfig   -- xsdconfig文件的位置, 这个文件主要用来制定生成的Java Class
                              的一些文件名规则和Package的名称,在本文,package是sample.xmlbean

       在本文,我是这样运行的:
       


       scomp -src build\src  -out build\customerXmlBean.jar schema\customer.xsd

             -compiler C:\jdk142_04\bin\javac customer.xsdconfig

      


       这个命令行的意思是告诉scomp生成customerXmlBean.jar,放在build目录下,同时
       生成源代码放在build\src下, Schema文件是customer.xsd,xsdconfig文件是customer.xsdconfig.

       其实, 生成的Java源代码没有多大作用,我们要的是jar文件.我们先看一下build\src\sample\xmlbean下生成的Classes.
       


          CustomersDocument.java    -- 整个XML文档的Java Class映射

       CustomerType.java              -- 节点sustomer的映射

       AddressType.java                 -- 节点address的映射

       BillingAddressType.java        -- 节点billingAddress的映射

       PrimaryAddressType.java      -- 节点primaryAddress的映射

    


       好了,到此我们所有的准备工作已经完成了. 下面就开始进入重点：利用刚才生成的jar文件读写XML.

五、利用XMLBean读XML文件

    新建一个Java Project,将XMLBean2.0.0\lib\下的Jar文件和刚才我们生成的customerXmlBean.jar加入
    到Project的ClassPath.

    新建一个Java Class: CustomerXMLBean.  源码如下:
     


    package com.sample.reader;



    import java.io.File;

    

    import sample.xmlbean.*;

    import org.apache.commons.beanutils.BeanUtils;

    import org.apache.xmlbeans.XmlOptions;

    public class CustomerXMLBean {

    private String filename = null;

    

    public CustomerXMLBean(String filename) {

            super();

            this.filename = filename;

    }



    public void customerReader() {

            try {

              File xmlFile = new File(filename);

              CustomersDocument doc = CustomersDocument.Factory.parse(xmlFile);

              CustomerType[] customers = doc.getCustomers().getCustomerArray();

          

              for (int i = 0; i < customers.length; i++) {

                CustomerType customer = customers[i];

                println("Customer#" + i);

                println("Customer ID:" + customer.getId());

                println("First name:" + customer.getFirstname());

                println("Last name:" + customer.getLastname());

                println("Gender:" + customer.getGender());

                println("PhoneNumber:" + customer.getPhoneNumber());

                // Primary address

                PrimaryAddressType primaryAddress = customer.getAddress().getPrimaryAddress();

                println("PrimaryAddress:");

                println("PostalCode:" + primaryAddress.getPostalCode());

                println("AddressLine1:" + primaryAddress.getAddressLine1());

                println("AddressLine2:" + primaryAddress.getAddressLine2());

                // Billing address

                BillingAddressType billingAddress = customer.getAddress().getBillingAddress();

                println("BillingAddress:");

                println("Receiver:" + billingAddress.getReceiver());

                println("PostalCode:" + billingAddress.getPostalCode());

                println("AddressLine1:" + billingAddress.getAddressLine1());

                println("AddressLine2:" + billingAddress.getAddressLine2());

            

              }

            } catch (Exception ex) {

                    ex.printStackTrace();

            }

    }

    private void println(String str) {

          System.out.println(str);

    }

   public static void main(String[] args) {

      String filename = "F://JavaTest//Eclipse//XMLBean//xml//customers.xml";

                   

     CustomerXMLBean customerXMLBean = new CustomerXMLBean(filename);

                   customerXMLBean.customerReader();

    }



    }

    


    运行它,参看输出结果:
     


       Customer#0

       Customer ID:1

       First name:Jessica

       Last name:Lim

       Gender:female

       PhoneNumber:1234567

       PrimaryAddress:

       PostalCode:350106

       AddressLine1:#25-1

       AddressLine2:SHINSAYAMA 2-CHOME

       BillingAddress:

       Receiver:Ms Danielle

       PostalCode:350107

       AddressLine1:#167

       AddressLine2:NORTH TOWER HARBOUR CITY



       Customer#1

       Customer ID:2

       First name:David

       Last name:Bill

       Gender:male

       PhoneNumber:808182

       PrimaryAddress:

       PostalCode:319087

       AddressLine1:1033 WS St.

       AddressLine2:Tima Road

       BillingAddress:

       Receiver:Mr William

       PostalCode:672993

       AddressLine1:1033 WS St.

       AddressLine2:Tima Road

    

    怎么样,是不是很轻松? XMLBean的威力.

六、利用XMLBean写XML文件

    利用XMLBean创建一个XML文档也是一件轻而易举的事.我们再增加一个Method,
    请看一下的Java Class:
     


    public void createCustomer() {

    try {

        // Create Document

        CustomersDocument doc = CustomersDocument.Factory.newInstance();

        // Add new customer

        CustomerType customer = doc.addNewCustomers().addNewCustomer();

        // set customer info

        customer.setId(3);

        customer.setFirstname("Jessica");

        customer.setLastname("Lim");

        customer.setGender("female");

        customer.setPhoneNumber("1234567");

        // Add new address

        AddressType address = customer.addNewAddress();

        // Add new PrimaryAddress

        PrimaryAddressType primaryAddress = address.addNewPrimaryAddress();

        primaryAddress.setPostalCode("350106");

        primaryAddress.setAddressLine1("#25-1");

        primaryAddress.setAddressLine2("SHINSAYAMA 2-CHOME");



        // Add new BillingAddress

        BillingAddressType billingAddress = address.addNewBillingAddress();

        billingAddress.setReceiver("Ms Danielle");

        billingAddress.setPostalCode("350107");

        billingAddress.setAddressLine1("#167");

        billingAddress.setAddressLine2("NORTH TOWER HARBOUR CITY");



        File xmlFile = new File(filename);

        doc.save(xmlFile);

        } catch (Exception ex) {

                ex.printStackTrace();

        }



  }

    

    修改main method.
     


    public static void main(String[] args) {

    String filename = "F://JavaTest//Eclipse//XMLBean//xml//customers_new.xml";

        CustomerXMLBean customerXMLBean = new CustomerXMLBean(filename);

        customerXMLBean.createCustomer();

    }

    

    运行,打开customers_new.xml:
     


    <?xml version="1.0" encoding="UTF-8"?>

    <Customers>

    <customer>

            <id>3</id>

            <gender>female</gender>

            <firstname>Jessica</firstname>

            <lastname>Lim</lastname>

            <phoneNumber>1234567</phoneNumber>

            <address>

                    <primaryAddress>

                         <postalCode>350106</postalCode>

                         <addressLine1>#25-1</addressLine1>

                                       <addressLine2>SHINSAYAMA 2-CHOME</addressLine2>

                    </primaryAddress>

                    <billingAddress>

                        <receiver>Ms Danielle</receiver>

                        <postalCode>350107</postalCode>

                       <addressLine1>#167</addressLine1>

                       <addressLine2>NORTH TOWER HARBOUR CITY</addressLine2>

                    </billingAddress>

                    </address>

            </customer>

    </Customers>

    



七、利用XMLBean修改XML文件

    我们再增加一个Method:
     


      public void updateCustomer(int id,String lastname) {

         try {

        File xmlFile = new File(filename);

        CustomersDocument doc = CustomersDocument.Factory.parse(xmlFile);

        CustomerType[] customers = doc.getCustomers().getCustomerArray();

      

        for (int i = 0; i < customers.length; i++) {

           CustomerType customer = customers[i];

          if(customer.getId()==id){

                customer.setLastname(lastname);

                break;

            }

        }

        doc.save(xmlFile);

         } catch (Exception ex) {

          ex.printStackTrace();

         }

           }

    

    main method:
     


    public static void main(String[] args) {

     String filename = "F://JavaTest//Eclipse//XMLBean//xml//customers_new.xml";

                    

    CustomerXMLBean customerXMLBean = new CustomerXMLBean(filename);

                    

    customerXMLBean.updateCustomer(3,"last");

    }

    

    运行之后,我们将会看到客户编号为3的客户的lastname已经改为last.

八、利用XMLBean删除一个customer

    再增加一个Method:
     


    public void deleteCustomer(int id) {

     try {

      File xmlFile = new File(filename);

     CustomersDocument doc = CustomersDocument.Factory.parse(xmlFile);

    CustomerType[] customers = doc.getCustomers().getCustomerArray();



   for (int i = 0; i < customers.length; i++) {

        CustomerType customer = customers[i];

        if(customer.getId()==id){

                        customer.setNil() ;

                        break;

               }

   }

   doc.save(xmlFile);

   } catch (Exception ex) {

        ex.printStackTrace();

        }

   }


         main method:
     


    public static void main(String[] args) {

    String filename = "F://JavaTest//Eclipse//XMLBean//xml//customers_new.xml";

                    

    CustomerXMLBean customerXMLBean = new CustomerXMLBean(filename);

                    

    customerXMLBean.deleteCustomer(3);

    }

        
运行,我们将会看到客户编号为3的客户的资料已经被删除.

九、查询XML

    除了本文在以上讲述的,利用XMLBean能轻轻松松完成XML的读写操作外,结合XPath和XQuery,
   XMLBean还能完成象SQL查询数据库一样方便地查询XML数据. 关于XML查询以及如何创建XML数据库, 我将在另一篇文章里讨论.



十、结束语
    XMLBean能帮助我们轻易读写XML,这将有助于我们降低XML的学习和使用,有了这个基础,
    开发人员将为学习更多地XML相关技术和Web Services,JMS等其他J2EE技术打下良好地基础.


关于作者：
叶枫：热爱Java和Oracle. 在软件开发有近10年, 目前在国外一家美国大公司担任SA, 负责技术研究。作者Blog：http://blog.matrix.org.cn/page/叶枫


lk 2007-11-22 11:08 发表评论
]]>java sax 解析 xmlhttp://www.blogjava.net/lcs/archive/2007/11/22/162304.htmllklkThu, 22 Nov 2007 02:44:00 GMThttp://www.blogjava.net/lcs/archive/2007/11/22/162304.htmlhttp://www.blogjava.net/lcs/comments/162304.htmlhttp://www.blogjava.net/lcs/archive/2007/11/22/162304.html#Feedback0http://www.blogjava.net/lcs/comments/commentRss/162304.htmlhttp://www.blogjava.net/lcs/services/trackbacks/162304.html
代码：
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.Locator;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.helpers.DefaultHandler;
import java.io.IOException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;


class TestSAX extends DefaultHandler{
    
    private StringBuffer buf;
    private String str;
    public TestSAX(){
        super(); 
    }
    
//    public void setDocumentLocator(Locator locator){}
    
    public void startDocument() throws SAXException{
        buf=new StringBuffer();
        System.out.println("*******开始解析文档*******");
    }
    
    public void endDocument() throws SAXException{        
        System.out.println("*******文档解析结束*******");
    }
    
    public void startPrefixMapping( String prefix, String uri ){
        System.out.println(" 前缀映射: " + prefix +" 开始!"+ " 它的URI是:" + uri);
    }
    
    public void endPrefixMapping( String prefix ){
        System.out.println(" 前缀映射: "+prefix+" 结束!");
    }
    
//    public void processingInstruction( String target, String instruction )throws SAXException{}
    
//    public void ignorableWhitespace( char[] chars, int start, int length ) throws SAXException {}
    
//    public void skippedEntity( String name ) throws SAXException {}
    
    public void startElement(String namespaceURI,String localName,String qName,Attributes atts){
        System.out.println("*******开始解析元素*******");    
        System.out.println("元素名"+qName);        
        for(int i=0;i<atts.getLength();i++){
            System.out.println("元素名"+atts.getLocalName(i)+"属性值"+atts.getValue(i));
        }
    }
    
    public void endElement(String namespaceURI,String localName,String fullName )throws SAXException{
//        buf.trimToSize();
        str = buf.toString(); 
        System.out.println("buf = "+buf+" || length = "+buf.length());
        System.out.println("str = "+str.trim()+" || length = "+str.trim().length());
        buf.delete(0,buf.length());
        System.out.println("******"+namespaceURI+"元素解析结束"+localName+"********"+fullName);
    }
    
    public void characters( char[] chars, int start, int length )throws SAXException{
        //将元素内容累加到StringBuffer中 
        buf.append(chars,start,length);
    }
    
    public static void main(String args[]){
        try{
            SAXParserFactory sf = SAXParserFactory.newInstance();
            SAXParser sp = sf.newSAXParser();
            TestSAX testsax=new TestSAX();
            sp.parse(new InputSource("test1.xml"),testsax);
        }catch(IOException e){
            e.printStackTrace(); 
        }catch(SAXException e){
            e.printStackTrace(); 
        }catch(Exception e){
            e.printStackTrace(); 
        }
    }
}

xml文件，我读的时候有错误，用了自己的，希望其他人比我幸运！
代码：
<?xml version="1.0" encoding="GB2312"?>
<row>
<person>
<name>王小明</name>
<college>信息学院</college> 
<telephone>6258113</telephone>
<notes>男,1955年生,博士，95年调入海南大学</notes>
</person>
</row>　


lk 2007-11-22 10:44 发表评论
]]>java 读xml文件例子http://www.blogjava.net/lcs/archive/2007/11/21/162088.htmllklkWed, 21 Nov 2007 06:47:00 GMThttp://www.blogjava.net/lcs/archive/2007/11/21/162088.htmlhttp://www.blogjava.net/lcs/comments/162088.htmlhttp://www.blogjava.net/lcs/archive/2007/11/21/162088.html#Feedback0http://www.blogjava.net/lcs/comments/commentRss/162088.htmlhttp://www.blogjava.net/lcs/services/trackbacks/162088.html
<?xml version="1.0" encoding="GB2312" standalone="no"?>
<books>
    <book email="zhoujunhui">
        <name>rjzjh</name>
        <price>jjjjjj</price>
    </book>
</books>

代码：

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
//下面主要是org.xml.sax包的类
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class DomParse {

    public DomParse(){
        //（1）得到DOM解析器的工厂实例
        DocumentBuilderFactory domfac=DocumentBuilderFactory.newInstance();
        //得到javax.xml.parsers.DocumentBuilderFactory;类的实例就是我们要的解析器工厂
        try {
            //（2）从DOM工厂获得DOM解析器
            DocumentBuilder dombuilder=domfac.newDocumentBuilder();
            //通过javax.xml.parsers.DocumentBuilderFactory实例的静态方法newDocumentBuilder()得到DOM解析器
            //（3）把要解析的XML文档转化为输入流，以便DOM解析器解析它
            InputStream is=new FileInputStream("test1.xml");            
            //（4）解析XML文档的输入流，得到一个Document
            Document doc=dombuilder.parse(is);
            //由XML文档的输入流得到一个org.w3c.dom.Document对象，以后的处理都是对Document对象进行的
            //（5）得到XML文档的根节点
            Element root=doc.getDocumentElement();
            //在DOM中只有根节点是一个org.w3c.dom.Element对象。
            //（6）得到节点的子节点
            NodeList books=root.getChildNodes();
            
            if(books!=null){
                for(int i=0;i<books.getLength();i++){
                    Node book=books.item(i);
                    if(book.getNodeType()==Node.ELEMENT_NODE){
                        //（7）取得节点的属性值
                        String email=book.getAttributes().getNamedItem("email").getNodeValue();
                        System.out.println(email);
                        //注意，节点的属性也是它的子节点。它的节点类型也是Node.ELEMENT_NODE
                        //（8）轮循子节点
                        for(Node node=book.getFirstChild();node!=null;node=node.getNextSibling()){
                            if(node.getNodeType()==Node.ELEMENT_NODE){
                                if(node.getNodeName().equals("name")){
                                    String name=node.getNodeValue();
                                    String name1=node.getFirstChild().getNodeValue();
                                    System.out.println(name);
                                    System.out.println(name1);
                                }
                                if(node.getNodeName().equals("price")){
                                    String price=node.getFirstChild().getNodeValue();
                                    System.out.println(price);
                                }
                            }
                        }
                    }
                }//（6）这是用一个org.w3c.dom.NodeList接口来存放它所有子节点的，还有一种轮循子节点的方法，后面有介绍
            }
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch