castor应用demo

它要做到就是把xml到bean的互相转换。
bean中稍微要注意点的地方：
1、bean要有默认的构造方法；
2、持久化的属性要有相应的get/set方法。

还有一个就是根据mapping来定义xml文档的结构，和相应的调整xml格式的方法。

     public static void testMarshal() throws Exception{
        Student bean = new Student( " Jack " );

        List < Teacher > tcrList = new ArrayList < Teacher > ();
        tcrList.add( new Teacher( " Miss Z " , " History " ) );
        tcrList.add( new Teacher( " Miss X " , " English " ) );
        bean.setTcrList( tcrList );

        File file = new File( FILENAME );
        Writer writer = new FileWriter( file );
        Marshaller m = new Marshaller( writer );
        Mapping mapping = new Mapping();
        mapping.loadMapping( " mapping.xml " );
        m.setMapping( mapping );
        m.setEncoding( " utf-8 " );
        m.marshal( bean );

         // 1.读取student.xml文件
        String unFormattedXml = CastorUtil.readFile( FILENAME );
         // 2.格式化XML文件
        String formattedXml = CastorUtil.formatXML( unFormattedXml );
         // 3.写入到student.xml文件
        CastorUtil.writeFile( FILENAME, formattedXml, false , false );
    }

     public static void testUnmarshal() throws Exception{
        File file = new File( FILENAME );
        Reader reader = new FileReader( file );
        Mapping mapping = new Mapping();
        mapping.loadMapping( " mapping.xml " );
        Unmarshaller unmar = new Unmarshaller( mapping );
        Student bean = (Student)unmar.unmarshal( reader );

        System.out.println( bean.getName() );
        List < Teacher > list = bean.getTcrList();
         for ( Teacher t : list ){
            System.out.println( t.getName() + " - " + t.getCourse() );
        }
    }

package com._castor;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.XMLSerializer;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class CastorUtil{

     private static Document parseXMLFile( String in )
                                                         throws ParserConfigurationException,
                                                        SAXException,
                                                        IOException{
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        InputSource is = new InputSource( new StringReader( in ) );
         return db.parse( is );
    }

     public static String formatXML( String unFormattedXml )
                                                             throws ParserConfigurationException,
                                                            SAXException,
                                                            IOException{
         final Document document = parseXMLFile( unFormattedXml );
        OutputFormat format = new OutputFormat( document );
        format.setIndenting( true );
        format.setLineWidth( 65 );
        format.setIndent( 2 );
        format.setEncoding( " utf-8 " );

        Writer out = new StringWriter();
        XMLSerializer serializer = new XMLSerializer( out, format );
        serializer.serialize( document );
         return out.toString();
    }

     public static String readFile( String filePath ) throws IOException{
        StringBuffer fileContent = new StringBuffer();
        File file = new File( filePath );
         if ( file.isFile() && file.exists() ){
            InputStreamReader read = new InputStreamReader( new FileInputStream( file ), " utf-8 " );
            BufferedReader reader = new BufferedReader( read );
            String line;
             while ( ( line = reader.readLine() ) != null ){
                fileContent.append( line );
            }
            reader.close();
            read.close();
        }
         return fileContent.toString();
    }

     /**
     * 向文件中写入内容
     *
     * @param filepath
     *            写入文件的文件路径
     * @param write
     *            写入的内容
     * @param flag1
     *            是否覆盖，true-不覆盖原来的内容(追加)，false-覆盖原来的内容
     * @param flag2
     *            是否换行，true-换行后写入，false-直接在文件末尾写入
     * @throws IOException
      */
     public static void writeFile(    String filepath,
                                    String str,
                                     boolean flag1,
                                     boolean flag2 ) throws IOException{

         // 1.使用File类找到一个文件
        File file = new File( filepath );

         // 2.通过子类实例化父类对象
        OutputStream out = null ; // 准备好一个输出的对象
         // flag1=true,追加;flag1=false,覆盖
        out = new FileOutputStream( file, flag1 ); // 实例化

         // 3.以循环的方式输出
        String result = "" ;
         if ( flag1 ){
             if ( flag2 ){
                result = " \n " + str;
            } else {
                result = str;
            }
        } else {
            result = str;
        }

         byte b[] = result.getBytes();
         for ( int i = 0 ; i < b.length; i ++ ){
            out.write( b[i] );
        }
        out.close();
    }
}

package com._castor;

import java.util.List;

public class Student{
    String name;
    List < Teacher > tcrList;

     public Student(){}

     public Student( String name ){
         this .name = name;
    }

     public String getName(){
         return name;
    }

     public void setName( String name ){
         this .name = name;
    }

     public List < Teacher > getTcrList(){
         return tcrList;
    }

     public void setTcrList( List < Teacher > tcrList ){
         this .tcrList = tcrList;
    }
}

package com._castor;

public class Teacher{
    String name;
    String course;

     public Teacher(){}

     public Teacher( String name, String course ){
         this .name = name;
         this .course = course;
    }

     public String getName(){
         return name;
    }

     public void setName( String name ){
         this .name = name;
    }

     public String getCourse(){
         return course;
    }

     public void setCourse( String course ){
         this .course = course;
    }
}

<? xml version="1.0" encoding="UTF-8" ?>
<! DOCTYPE mapping PUBLIC "-//EXOLAB/Castor Mapping DTD Version 1.0//EN" "http://castor.org/mapping.dtd" >
< mapping >
     

     < class name ="com._castor.Student" >
         < map-to xml ="student-info" />
         < field name ="name" type ="java.lang.String" >
             < bind-xml name ="studentName" node ="attribute" />
         </ field >
         < field name ="tcrList" collection ="arraylist" type ="com._castor.Teacher" >
             < bind-xml name ="teacher" />
         </ field >
     </ class >

     < class name ="com._castor.Teacher" >
         < field name ="name" type ="java.lang.String" >
             < bind-xml name ="name" node ="attribute" />
         </ field >

         < field name ="course" type ="java.lang.String" >
             < bind-xml name ="courseName" node ="element" />
         </ field >
     </ class >

</ mapping >

castor应用demo

castor应用demo

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