利用jdk6中Annotation将XML与对象之间互相转化（一）

开发中我们常会用到将XML与对象之间互相转化，下面是利用Annotation注解的方式进行两者之间的互相转化

注意：对象中的属性字段需要和xml文件中的元素名称保持一致（大小写也要一致），如果不一致，必须在注解中指定name属性

首页给大家看一下目录结构：

XML格式一

1、students.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<students>
<student idcard="001" age="18" name="小红">
<basicinfo>
<school>中科大</school>
<tel>18399990099</tel>
</basicinfo>
<workinfo>
<company>科大讯飞</company>
<tel>19888888888</tel>
</workinfo>
</student>
</students>

2、StudentConfig.java(定义外层students元素)

/*
* Copyright @ 2015 com.iflysse.trains
* MyTest 下午4:17:33
* All right reserved.
*
*/
package com.xml.obj.test2;

import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

import com.alibaba.fastjson.JSON;

/**
* @desc: MyTest
* @author: kpchen
* @createTime: 2015年8月19日 下午4:17:33
* @history:
* @version: v1.0
*/
@XmlRootElement(name = "students")
@XmlAccessorType(XmlAccessType.FIELD)
public class StudentConfig {
@XmlElement(name = "student")
private List<Student> list;

public List<Student> getList() {
return list;
}

public void setList(List<Student> list) {
this.list = list;
}

@Override
public String toString() {
return JSON.toJSONString(this);
}

}

3、Student.java(定义student元素)

/*
* Copyright @ 2015 com.iflysse.trains
* MyTest 下午4:18:30
* All right reserved.
*
*/
package com.xml.obj.test2;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;

import com.alibaba.fastjson.JSON;

/**
* @desc: MyTest
* @author: kpchen
* @createTime: 2015年8月19日 下午4:18:30
* @history:
* @version: v1.0
*/
@XmlAccessorType(XmlAccessType.FIELD)
public class Student {
@XmlElement(name = "basicinfo")
private BasicInfo basicinfo;
@XmlElement(name = "workinfo")
private WorkInfo workinfo;

@XmlAttribute
private String idcard;
@XmlAttribute
private String age;
@XmlAttribute
private String name;

public BasicInfo getBasicinfo() {
return basicinfo;
}

public void setBasicinfo(BasicInfo basicinfo) {
this.basicinfo = basicinfo;
}

public WorkInfo getWorkinfo() {
return workinfo;
}

public void setWorkinfo(WorkInfo workinfo) {
this.workinfo = workinfo;
}

public String getIdcard() {
return idcard;
}

public void setIdcard(String idcard) {
this.idcard = idcard;
}

public String getAge() {
return age;
}

public void setAge(String age) {
this.age = age;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

@Override
public String toString() {
return JSON.toJSONString(this);
}

}

4、BasicInfo.java(定义student元素中的basicinfo元素)

/*
* Copyright @ 2015 com.iflysse.trains
* MyTest 下午4:24:04
* All right reserved.
*
*/
package com.xml.obj.test2;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;

import com.alibaba.fastjson.JSON;

/**
* @desc: MyTest
* @author: kpchen
* @createTime: 2015年8月19日 下午4:24:04
* @history:
* @version: v1.0
*/
@XmlAccessorType(XmlAccessType.FIELD)
public class BasicInfo {
@XmlElement
private String school;
@XmlElement
private String tel;

public String getSchool() {
return school;
}

public void setSchool(String school) {
this.school = school;
}

public String getTel() {
return tel;
}

public void setTel(String tel) {
this.tel = tel;
}

@Override
public String toString() {
return JSON.toJSONString(this);
}

}

5、WorkInfo.java(定义student元素中的workinfo元素)

/*
* Copyright @ 2015 com.iflysse.trains
* MyTest 下午4:24:10
* All right reserved.
*
*/
package com.xml.obj.test2;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;

import com.alibaba.fastjson.JSON;

/**
* @desc: MyTest
* @author: kpchen
* @createTime: 2015年8月19日 下午4:24:10
* @history:
* @version: v1.0
*/
@XmlAccessorType(XmlAccessType.FIELD)
public class WorkInfo {
@XmlElement
private String company;
@XmlElement
private String tel;

public String getCompany() {
return company;
}

public void setCompany(String company) {
this.company = company;
}

public String getTel() {
return tel;
}

public void setTel(String tel) {
this.tel = tel;
}

@Override
public String toString() {
return JSON.toJSONString(this);
}
}

6、XmlParser.java（测试类）

package com.xml.obj.test2;

import java.io.StringReader;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;

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

/**
* Created by admin on 2015/8/12.
*/
public class XmlParser {

public static XmlParser insetance;

private XmlParser() {

}

public static XmlParser getInstance() {
if (insetance == null) {
return new XmlParser();
} else {
return insetance;
}

}

/* 将对象转为xml */
public String mshall(Object oc, Class<?> cc) throws Exception {
JAXBContext cxt = JAXBContext.newInstance(cc);
Marshaller mm = cxt.createMarshaller();
StringWriter writer = new StringWriter();
mm.marshal(oc, writer);
return writer.toString();

}

/* 将xml转对象 */
public Object unmashall(String xmlString, Class<?> cc) throws Exception {
JAXBContext cxt = JAXBContext.newInstance(cc);
Unmarshaller unm = cxt.createUnmarshaller();
Object cnt = unm.unmarshal(new StringReader(xmlString));
return cnt;
}

public static void main(String[] args) throws Exception {

// test_unmashall();

test_mshall();

}

private static void test_mshall() {
BasicInfo bi = new BasicInfo();
bi.setSchool("中科大");
bi.setTel("18399990099");
WorkInfo wi = new WorkInfo();
wi.setCompany("科大讯飞");
wi.setTel("19888888888");
Student stu = new Student();
stu.setBasicinfo(bi);
stu.setWorkinfo(wi);
stu.setAge("18");
stu.setIdcard("001");
stu.setName("小红");
List<Student> list = new ArrayList<Student>();
list.add(stu);

StudentConfig sc = new StudentConfig();
sc.setList(list);

try {
String xmlString = XmlParser.getInstance().mshall(sc, StudentConfig.class);
System.out.println(xmlString);
} catch (Exception e) {

}

}

private static void test_unmashall() {

String x2 = "<students><student idcard='101' age='28' name='小红'><basicinfo><school>中科大</school><tel>18399990099</tel></basicinfo><workinfo><company>科大讯飞</company><tel>19888888888</tel></workinfo></student><student idcard='001' age='18' name='小红'><basicinfo><school>中科大</school><tel>18399990099</tel></basicinfo><workinfo><company>科大讯飞</company><tel>19888888888</tel></workinfo></student></students>";
try {
StudentConfig ff = (StudentConfig) XmlParser.getInstance().unmashall(x2, StudentConfig.class);

List<Student> ops = ff.getList();
for (Student op : ops) {
System.out.println(op.toString());
}

} catch (Exception e) {
e.printStackTrace();
}

}
}

源码：http://pan.baidu.com/s/1dD2NWad