用Apache Commons Betwixt 在XML与Java对象之间相互转换

项目地址：http://commons.apache.org/proper/commons-betwixt/

/** 
* XML转Java 
*/ 
public class ReadExampleApp { 

        public static final void main(String args[]) throws Exception { 

                //创建一个读取xml文件的流 
                StringReader xmlReader = new StringReader( 
                                "<?xml version='1.0' ?><person><age>25</age><name>James Smith</name></person>"); 

                //创建一个BeanReader实例，相当于转换器 
                BeanReader beanReader = new BeanReader(); 

                //配置BeanReader实例 
                beanReader.getXMLIntrospector().getConfiguration().setAttributesForPrimitives(false); 
                beanReader.getBindingConfiguration().setMapIDs(false); //不自动生成ID 

                //注册要转换对象的类，并指定根节点名称 
                beanReader.registerBeanClass("person", PersonBean.class); 

                //将XML解析Java Object 
                PersonBean person = (PersonBean) beanReader.parse(xmlReader); 

                //在控制台输出对象 
                System.out.println(person); 
        } 
}

/** 
* 将java对象转换为xml，并输出到文件 
*/ 
public class WriteExampleApp { 

        public static final void main(String [] args) throws Exception { 

                //创建一个输出流，将用来输出Java转换的XML文件 
                FileWriter outputWriter = new FileWriter("c:\\123.txt"); 

                //输出XML的文件头 
                outputWriter.write("<?xml version='1.0' ?>"); 

                //创建一个BeanWriter实例，并将BeanWriter的输出重定向到指定的输出流 
                BeanWriter beanWriter = new BeanWriter(outputWriter); 

                //配置BeanWriter对象 
                beanWriter.getXMLIntrospector().getConfiguration().setAttributesForPrimitives(false); 
                beanWriter.getBindingConfiguration().setMapIDs(false); 
                beanWriter.enablePrettyPrint(); 

                Person person = new Person("XXX", 21); 
                beanWriter.write(person); 

                //关闭输出流 
                outputWriter.close(); 
        } 
}

/** 
* 将Java对象转换为XML，并获取其字符串 
* 
*/ 
public class WriteStringExampleApp { 
        public static final void main(String [] args) throws Exception { 
                String reslutXml; 

                //创建一个输出流，将用来输出Java转换的XML文件 
                StringWriter outputWriter = new StringWriter(); 

                //输出XML的文件头 
                outputWriter.write("<?xml version='1.0' ?>"); 

                //创建一个BeanWriter实例，并将BeanWriter的输出重定向到指定的输出流 
                BeanWriter beanWriter = new BeanWriter(outputWriter); 

                //配置BeanWriter对象 
                beanWriter.getXMLIntrospector().getConfiguration().setAttributesForPrimitives(false); 
                beanWriter.getBindingConfiguration().setMapIDs(false); 
                beanWriter.enablePrettyPrint(); 

                Person person = new Person("xxx", 21); 
                beanWriter.write(person); 

                reslutXml = outputWriter.toString(); 

                //关闭输出流 
                outputWriter.close(); 

                //控制台输出转换结果的字符串 
                System.out.println(reslutXml); 
        } 
}