jaxb小工具类

package jaxb.shop;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

public class JAXB
{

  /**
   * 把对象转换成xml
   * @param object   转换的对象
   * @param charset  xml的字符集
   * @param format   是否格式化
   * @return
   * @throws JAXBException
   */
  public static String objectToXml(Object object, String charset, boolean format)
    throws JAXBException
  {
    ByteArrayOutputStream baos = null;
    try {
      Marshaller m = JAXBContext.newInstance(new Class[] { object.getClass() }).createMarshaller();
      //指定生成xml的编码
      m.setProperty("jaxb.encoding", charset);
      //用来指定是否使用换行和缩排对已编组 xml 数据进行格式化的属性名称
      m.setProperty("jaxb.formatted.output", Boolean.valueOf(format));
      baos = new ByteArrayOutputStream();
      m.marshal(object, baos);
      return baos.toString();
    }
    finally {
      if (baos != null)
        try {
          baos.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
    }
  }

  /**
   * 对象转换为字符串
   * @param object  转换对象
   * @param format  是否格式化
   * @return
   * @throws JAXBException
   */
  public static String objectToXml(Object object, boolean format)
    throws JAXBException
  {
    ByteArrayOutputStream baos = null;
    try {
      Marshaller m = JAXBContext.newInstance(new Class[] { object.getClass() }).createMarshaller();
      m.setProperty("jaxb.encoding", System.getProperty("file.encoding"));
      m.setProperty("jaxb.formatted.output", Boolean.valueOf(format));
      baos = new ByteArrayOutputStream();
      m.marshal(object, baos);
      return baos.toString();
    }
    finally {
      if (baos != null)
        try {
          baos.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
    }
  }

  
  /**
   * xml转换成对象
   * @param objectClass   转换成对象Class
   * @param xml   xml字符串
   * @param charset  指定字符集
   * @return
   * @throws JAXBException
   */
  public static Object xmlToObject(Class objectClass, String xml, String charset)
    throws JAXBException
  {
    InputStream is = null;
    Unmarshaller um = null;
    try {
      is = new ByteArrayInputStream(xml.getBytes(charset));
      um = JAXBContext.newInstance(new Class[] { objectClass }).createUnmarshaller();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();

      if (is != null)
        try {
          is.close();
        } catch (IOException exx) {
          exx.printStackTrace();
        }
    }
    finally
    {
      if (is != null)
        try {
          is.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
    }
    return um.unmarshal(is);
  }

  /**
   * xml转换成对象
   * @param objectClass
   * @param xml
   * @return
   * @throws JAXBException
   */
  public static Object xmlToObject(Class objectClass, String xml)
    throws JAXBException
  {
    InputStream is = null;
    Unmarshaller um = null;
    try {
      is = new ByteArrayInputStream(xml.getBytes(System.getProperty("file.encoding")));
      um = JAXBContext.newInstance(new Class[] { objectClass }).createUnmarshaller();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();

      if (is != null)
        try {
          is.close();
        } catch (IOException exx) {
          exx.printStackTrace();
        }
    }
    finally
    {
      if (is != null)
        try {
          is.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
    }
    return um.unmarshal(is);
  }
}