java使用commons-betwixt 实现bean与xml互转

项目下载地址：http://download.csdn.net/detail/afgasdg/4825666

项目所需的jar包：

一、XML2BeanUtils.java工具类如下：

package com.viathink.core.utils;import java.beans.IntrospectionException;import java.io.IOException;import java.io.StringReader;import java.io.StringWriter;import org.apache.commons.betwixt.BindingConfiguration;import org.apache.commons.betwixt.IntrospectionConfiguration;import org.apache.commons.betwixt.expression.Context;import org.apache.commons.betwixt.io.BeanReader;import org.apache.commons.betwixt.io.BeanWriter;import org.apache.commons.betwixt.strategy.DecapitalizeNameMapper;import org.apache.commons.betwixt.strategy.DefaultObjectStringConverter;import org.apache.commons.betwixt.strategy.HyphenatedNameMapper;import org.xml.sax.SAXException;/** * Xml文件与javaBean对象互转工具类 * @author LiuJunGuang * @date 2012-11-21下午1:38:56 */public class XML2BeanUtils {private static final String xmlHead = "<?xml version='1.0' ?>";/** * 将javaBean对象转换成xml文件，对于没有设置的属性将不会生成xml标签 * @author LiuJunGuang * @param obj 待转换的javabean对象 * @return String 转换后的xml 字符串 * @throws IntrospectionException  * @throws SAXException  * @throws IOException  * @date 2012-11-21下午1:38:53 */public static String bean2XmlString(Object obj) throws IOException, SAXException, IntrospectionException {if (obj == null)throw new IllegalArgumentException("给定的参数不能为null！");StringWriter sw = new StringWriter();sw.write(xmlHead);// 写xml文件头BeanWriter writer = new BeanWriter(sw);IntrospectionConfiguration config = writer.getXMLIntrospector().getConfiguration();BindingConfiguration bc = writer.getBindingConfiguration();bc.setObjectStringConverter(new DateConverter());bc.setMapIDs(false);config.setAttributesForPrimitives(false);config.setAttributeNameMapper(new HyphenatedNameMapper());config.setElementNameMapper(new DecapitalizeNameMapper());writer.enablePrettyPrint();writer.write(obj.getClass().getSimpleName(), obj);writer.close();return sw.toString();}/** * 将xml文件转换成相应的javabean对象,对于List，Map，Array转换时需要在需要保证Bean类中有单个添加方法</br> * <p><blockquote><pre> * 例如：List<{@link String}> userNameList --> addUserNameList(String username) *      String[] items            --> addItems(String item) *      Map<String,User> userMap               --> addUserMap(String key,User user) * </pre></blockquote></p> * 注意：<br> *     目前还没有找到好的方法解决Map与Map嵌套，List与List等嵌套的问题，使用时应当避免以上几种情况。 * @author LiuJunGuang * @param beanClass 待转换的javabean字节码 * @param xmlFile xml文件字符串 * @return 转换后的对象 * @throws IntrospectionException  * @throws SAXException  * @throws IOException  * @date 2012-11-21下午1:40:14 */@SuppressWarnings("unchecked")public static <T> T xmlSring2Bean(Class<T> beanClass, String xmlFile) throws IntrospectionException, IOException,SAXException {if (beanClass == null || xmlFile == null || xmlFile.isEmpty())throw new IllegalArgumentException("给定的参数不能为null！");StringReader xmlReader = new StringReader(xmlFile);BeanReader reader = new BeanReader();reader.getXMLIntrospector().getConfiguration().setAttributesForPrimitives(false);BindingConfiguration bc = reader.getBindingConfiguration();bc.setObjectStringConverter(new DateConverter());bc.setMapIDs(false);T obj = null;reader.registerBeanClass(beanClass.getSimpleName(), beanClass);obj = (T) reader.parse(xmlReader);xmlReader.close();return obj;}/** * 日期转换，主要是解决日期为null或者空字符串解析报错问题 * @author LiuJunGuang * @date 2013年12月31日下午6:56:49 */private static class DateConverter extends DefaultObjectStringConverter {private static final long serialVersionUID = -197858851188189916L;@Override@SuppressWarnings("rawtypes")public String objectToString(Object object, Class type, String flavour, Context context) {return super.objectToString(object, type, flavour, context);}@Override@SuppressWarnings("rawtypes")public Object stringToObject(String string, Class type, String flavour, Context context) {if (string == null || "".equals(string))return null;return super.stringToObject(string, type, flavour, context);}}}

    二、简单的javabean对象：

package com.aimilin;public class PersonBean {private String name;private int age;public PersonBean() {}public PersonBean(String name, int age) {this.name = name;this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return "PersonBean[name='" + name + "',age='" + age + "']";}}

package com.aimilin;import java.io.Serializable;import java.util.Arrays;import java.util.HashMap;import java.util.LinkedList;import java.util.List;import java.util.Map;public class User implements Serializable {private static final long serialVersionUID = 1354973253595584043L;private String userName;private int age;private PersonBean person;private List<String> hobbyList;private Map<String, PersonBean> personMap;private String[] hobbyArray;/** * 添加map类型属性的方法 * @param key * @param person * @date 2012-11-29下午1:01:06 */public void addPersonMap(String key, PersonBean person) {if (personMap == null) {personMap = new HashMap<String, PersonBean>();}personMap.put(key, person);}/** * 添加list类型的方法 * @param hobby * @date 2012-11-29下午1:01:07 */public void addHobbyList(String hobby) {if (hobbyList == null) {hobbyList = new LinkedList<String>();}hobbyList.add(hobby);}/** * 添加数组类型的方法 * @param hobby * @date 2012-11-29下午1:01:09 */public void addHobbyArray(String hobby) {hobbyArray = StringUtils.addStringToArray(hobbyArray, hobby);}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public User() {super();}public PersonBean getPerson() {return person;}public void setPerson(PersonBean person) {this.person = person;}public List<String> getHobbyList() {return hobbyList;}public void setHobbyList(List<String> hobbyList) {this.hobbyList = hobbyList;}public Map<String, PersonBean> getPersonMap() {return personMap;}public void setPersonMap(Map<String, PersonBean> personMap) {this.personMap = personMap;}public String[] getHobbyArray() {return hobbyArray;}public void setHobbyArray(String[] hobbyArray) {this.hobbyArray = hobbyArray;}@Overridepublic String toString() {return "User [userName=" + userName + ", age=" + age + ", person=" + person + ", hobbyList=" + hobbyList+ ", personMap=" + personMap + ", hobbyArray=" + Arrays.toString(hobbyArray) + "]";}}

测试类：

package com.aimilin;import java.util.Arrays;import java.util.HashMap;import java.util.Map;import org.junit.Test;public class XML2BeanUtilsTest {@Test//测试简单属性public void testPsersonBean() throws Exception {String xmlString = XML2BeanUtils.bean2XmlString(createPerson());System.out.println(xmlString);PersonBean person = XML2BeanUtils.xmlSring2Bean(PersonBean.class, xmlString);System.out.println(person);}@Test//测试复杂属性public void testUser() throws Exception {String xmlString = XML2BeanUtils.bean2XmlString(createUser());System.out.println(xmlString);User user = XML2BeanUtils.xmlSring2Bean(User.class, xmlString);System.out.println(user);}public PersonBean createPerson() {return new PersonBean("name", 23);}//创建复杂的用户对象public User createUser() {User user = new User();user.setAge(18);user.setUserName("张三");user.setHobbyArray(new String[] { "篮球", "足球", "乒乓球", "羽毛球" });user.setHobbyList(Arrays.asList(new String[] { "游泳", "蛙游", "蝶泳", "自由泳", "狗刨" }));user.setPerson(createPerson());Map<String, PersonBean> personMap = new HashMap<String, PersonBean>();for (int i = 0; i < 5; i++) {personMap.put("person" + i, new PersonBean("person" + i, i));}user.setPersonMap(personMap);return user;}}

结果：testPsersonBean运行结果：

<?xml version='1.0' ?>  <PersonBean>    <age>23</age>    <name>name</name>  </PersonBean>

PersonBean[name='name',age='23']

testUser运行结果：

<?xml version='1.0' ?>  <User>    <age>18</age>    <hobbyArray>      <hobbyArray>篮球</hobbyArray>      <hobbyArray>足球</hobbyArray>      <hobbyArray>乒乓球</hobbyArray>      <hobbyArray>羽毛球</hobbyArray>    </hobbyArray>    <hobbyList>      <hobbyList>游泳</hobbyList>      <hobbyList>蛙游</hobbyList>      <hobbyList>蝶泳</hobbyList>      <hobbyList>自由泳</hobbyList>      <hobbyList>狗刨</hobbyList>    </hobbyList>    <person>      <age>23</age>      <name>name</name>    </person>    <personMap>      <entry>        <key>person3</key>        <value>          <age>3</age>          <name>person3</name>        </value>      </entry>      <entry>        <key>person4</key>        <value>          <age>4</age>          <name>person4</name>        </value>      </entry>      <entry>        <key>person1</key>        <value>          <age>1</age>          <name>person1</name>        </value>      </entry>      <entry>        <key>person2</key>        <value>          <age>2</age>          <name>person2</name>        </value>      </entry>      <entry>        <key>person0</key>        <value>          <age>0</age>          <name>person0</name>        </value>      </entry>    </personMap>    <userName>张三</userName>  </User>

User [userName=张三, age=18, person=PersonBean[name='name',age='23'], hobbyList=[游泳, 蛙游, 蝶泳, 自由泳, 狗刨], personMap={person3=PersonBean[name='person3',age='3'], person4=PersonBean[name='person4',age='4'], person1=PersonBean[name='person1',age='1'], person2=PersonBean[name='person2',age='2'], person0=PersonBean[name='person0',age='0']}, hobbyArray=[篮球, 足球, 乒乓球, 羽毛球]]

项目下载地址：http://download.csdn.net/detail/afgasdg/4825666