JAXB

package d;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.text.MessageFormat;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;

import javax.xml.bind.Unmarshaller;

/**
* 基于JAXB的XML生成器: 用于pojo与xml文件的相互转换
* @author xyp
* @ClassName XmlBuilder
* @DateTime 2017年2月27日 上午11:40:17
*/
public abstract class XmlBuilder {

/**
* 将pojo转换为XML字符串
* @param object
* @return
*/
public static String convertToXml(Object object) {
Writer sw = new StringWriter();
try {
// 利用jdk中自带的转换类实现
JAXBContext context = JAXBContext.newInstance(object.getClass());

Marshaller marshaller = context.createMarshaller();
// 格式化xml输出的格式
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
// 将对象转换成输出流形式的xml
marshaller.marshal(object, sw);
} catch (JAXBException e) {
e.printStackTrace();
} finally {
if(sw != null) {
try {
sw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return sw.toString().replace("standalone=\"yes\"", "");
}

/**
* 将pojo转换为XML文件
* @param obj
* @param savePath
*/
public static File convertToXmlFile(Object obj,String savePath) {
File file = null;
String xmlStr = convertToXml(obj);
if(xmlStr != null && !"".equals(xmlStr)) {

file = new File(savePath);
if(!file.exists() && file.isFile()) {
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
if(file.isDirectory()) {
System.out.println(MessageFormat.format("{0}不是有效的文件路径.", savePath));
return null;
}

Writer writer = null;

try {
writer = new FileWriter(file);
writer.write(xmlStr);
writer.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
if(writer != null) {
try {
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

}
return file;
}

/**
* 将XML文件转换为指定类型的pojo
* @param clazz
* @param xmlPath
* @return
*/
public static Object xmlFileToObject(Class<?> clazz, String xmlPath) {
Object xmlObject = null;
Reader fr = null;
try {
JAXBContext context = JAXBContext.newInstance(clazz);
Unmarshaller unmarshaller = context.createUnmarshaller();
fr = new FileReader(xmlPath);
xmlObject = unmarshaller.unmarshal(fr);
} catch (JAXBException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
if (null != fr) {
try {
fr.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return xmlObject;
}

/**
* 将XML字符串转换为指定类型的pojo
*
* @param clazz
* @param xmlStr
* @return
*/
public static Object xmlStrToObject(Class<?> clazz, String xmlStr) {
Object xmlObject = null;
Reader reader = null;
try {
JAXBContext context = JAXBContext.newInstance(clazz);
// 进行将Xml转成对象的核心接口
Unmarshaller unmarshaller = context.createUnmarshaller();
reader = new StringReader(xmlStr);
xmlObject = unmarshaller.unmarshal(reader);
} catch (JAXBException e) {
e.printStackTrace();
} finally {
if (null != reader) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return xmlObject;
}
}