使用JAXB实现JAVA对象和XML字符串的互相转换

Love The Way You Lie 2022-06-16 10:39 201阅读 0赞

关于JAXB的介绍，见：[http://blog.csdn.net/qq\_32786873/article/details/71715254][http_blog.csdn.net_qq_32786873_article_details_71715254]

测试类：

package com.solin.test;
    
    import java.util.ArrayList;
    import java.util.List;
    
    public class Test {
    	public static void main(String[] args) {
    		Student student = new Student();
    		student.setName("邪恶小法师");
    		student.setAge("110");
    		student.setSex("男");
    		List<Student.Friend> list = new ArrayList<>();
    		Student.Friend f1 = new Student.Friend();
    		f1.setName("德玛西亚之力");
    		f1.setAge("888");
    		f1.setSex("男");
    		
    		Student.Friend f2 = new Student.Friend();
    		f2.setName("无双剑姬");
    		f2.setAge("898");
    		f2.setSex("女");
    		
    		list.add(f1);
    		list.add(f2);
    		student.setFriend(list);
    		
    		//将java对象转换为XML字符串
    		String xmlStr = XmlAndJavaObjectConvert.convertToXml(student);
    		System.out.println(xmlStr);
    		
    		//将xml字符串转换为java对象
            System.out.println(XmlAndJavaObjectConvert.convertXmlStrToObject(Student.class, xmlStr));
    	}
    }

实体类：

package com.solin.test;
    
    import java.util.List;
    
    import javax.xml.bind.annotation.XmlElementWrapper;
    import javax.xml.bind.annotation.XmlRootElement;
    import javax.xml.bind.annotation.XmlType;
    
    //XML文件中的根标识  
    @XmlRootElement(name = "Student") 
    //控制JAXB 绑定类中属性和字段的排序  
    @XmlType(propOrder = {   
       "name",   
       "age",   
       "sex",   
       "friend"
    })  
    public class Student {
    	private String name;
    	private String age;
    	private String sex;
    	private List<Friend> friend;
    	
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public String getAge() {
    		return age;
    	}
    
    	public void setAge(String age) {
    		this.age = age;
    	}
    
    	public String getSex() {
    		return sex;
    	}
    
    	public void setSex(String sex) {
    		this.sex = sex;
    	}
    
    	@XmlElementWrapper(name="friendList")
    	public List<Friend> getFriend() {
    		return friend;
    	}
    
    	public void setFriend(List<Friend> friend) {
    		this.friend = friend;
    	}
    
    	@Override
    	public String toString() {
    		return "Student [name=" + name + ", age=" + age + ", sex=" + sex + ", friendList=" + friend + "]";
    	}
    
    	public static class Friend{
    		private String name;
    		private String age;
    		private String sex;
    		public String getName() {
    			return name;
    		}
    		public void setName(String name) {
    			this.name = name;
    		}
    		public String getAge() {
    			return age;
    		}
    		public void setAge(String age) {
    			this.age = age;
    		}
    		public String getSex() {
    			return sex;
    		}
    		public void setSex(String sex) {
    			this.sex = sex;
    		}
    		@Override
    		public String toString() {
    			return "Friend [name=" + name + ", age=" + age + ", sex=" + sex + "]";
    		}
    	}
    }

工具类：

package com.solin.test;
    
    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;
    
    public class XmlAndJavaObjectConvert {
    	/** 
         * 将对象直接转换成String类型的 XML输出 
         *  
         * @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String类型的xml转换成对象 
         */  
        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;  
        }  
    }

输出结果如下：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    <Student>
        <name>邪恶小法师</name>
        <age>110</age>
        <sex>男</sex>
        <friendList>
            <friend>
                <age>888</age>
                <name>德玛西亚之力</name>
                <sex>男</sex>
            </friend>
            <friend>
                <age>898</age>
                <name>无双剑姬</name>
                <sex>女</sex>
            </friend>
        </friendList>
    </Student>
    
    Student [name=邪恶小法师, age=110, sex=男, friendList=[Friend [name=德玛西亚之力, age=888, sex=男], Friend [name=无双剑姬, age=898, sex=女]]]

[http_blog.csdn.net_qq_32786873_article_details_71715254]: http://blog.csdn.net/qq_32786873/article/details/71715254