实体类与xml相互转化

实体类：

package test;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Student {
    private Integer id;
    private String name;
    private Integer age;
    
    
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    @Override
    public String toString() {
        return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
    }
    
    
}

工具类：

package test;  
  
import java.io.FileNotFoundException;  
import java.io.FileReader;  
import java.io.FileWriter;  
import java.io.IOException;  
import java.io.StringReader;  
import java.io.StringWriter;  
  

import javax.xml.bind.JAXBContext;  
import javax.xml.bind.JAXBException;  
import javax.xml.bind.Marshaller;  
import javax.xml.bind.Unmarshaller;  
import javax.xml.bind.annotation.XmlRootElement;
  
/** 
 * 封装了XML转换成object，object转换成XML的代码 
 *  
 *  
 */  
public class XMLUtil {  
    /** 
     * 将对象直接转换成String类型的 XML输出 
     * obj在class上必须加@XmlRootElement注释
     * @param obj 
     * @return 
     */  
    public static String convertToXml(Object obj) {  
        // 创建输出流  
        StringWriter sw = new StringWriter();  
        try {  
            // 利用jdk中自带的转换类实现  
            JAXBContext context = JAXBContext.newInstance(obj.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(obj, sw);  
        } catch (JAXBException e) {  
            e.printStackTrace();  
        }  
        return sw.toString();  
    }  
  
    /** 
     * 将对象根据路径转换成xml文件 
     * obj在class上必须加@XmlRootElement注释
     * @param obj 
     * @param path 
     * @return 
     */  
    public static void convertToXml(Object obj, String path) {  
        try {  
            // 利用jdk中自带的转换类实现  
            JAXBContext context = JAXBContext.newInstance(obj.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  
            // 创建输出流  
            FileWriter fw = null;  
            try {  
                fw = new FileWriter(path);  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
            marshaller.marshal(obj, fw);  
        } catch (JAXBException e) {  
            e.printStackTrace();  
        }  
    }  
  
    @SuppressWarnings("unchecked")  
    /** 
     * 将String类型的xml转换成对象 
     * clazz在类名上必须加@XmlRootElement注释
     */  
    public static Object convertXmlStrToObject(Class clazz, String xmlStr) {  
        Object xmlObject = null;  
        try {  
            JAXBContext context = JAXBContext.newInstance(clazz);  
            // 进行将Xml转成对象的核心接口  
            Unmarshaller unmarshaller = context.createUnmarshaller();  
            StringReader sr = new StringReader(xmlStr);  
            xmlObject = unmarshaller.unmarshal(sr);  
        } catch (JAXBException e) {  
            e.printStackTrace();  
        }  
        return xmlObject;  
    }  
  
    @SuppressWarnings("unchecked")  
    /** 
     * 将file类型的xml转换成对象 
     * clazz在类名上必须加@XmlRootElement注释
     */  
    public static Object convertXmlFileToObject(Class clazz, String xmlPath) {  
        Object xmlObject = null;  
        try {  
            JAXBContext context = JAXBContext.newInstance(clazz);  
            Unmarshaller unmarshaller = context.createUnmarshaller();  
            FileReader fr = null;  
            try {  
                fr = new FileReader(xmlPath);  
            } catch (FileNotFoundException e) {  
                e.printStackTrace();  
            }  
            xmlObject = unmarshaller.unmarshal(fr);  
        } catch (JAXBException e) {  
            e.printStackTrace();  
        }  
        return xmlObject;  
    }  
    
    public static void main(String[] args) {
        Student stu=new Student();
        stu.setId(1);
        stu.setName("李三");
        stu.setAge(20);
        
        //System.out.println(convertToXml(stu));
        
        //convertToXml(stu, "e:\alivin\cc.xml");
            
        /*String xmlStr="<student><age>20</age><id>1</id><name>李三</name></student>";
        Student stu1=(Student)convertXmlStrToObject(Student.class, xmlStr);
        System.out.println(stu1);*/
        
        System.out.println(convertXmlFileToObject(Student.class, "e:\alivin\cc.xml").toString());
    }
    
}