要生成和解析如下格式的xml文件：
<?xml version="1.0" encoding="UTF-8"?> <Message xmlns:xs="http://www.w3.org/2001/XMLSchema">
<User>
<id>1</id>
<name>李寻欢</name>
<age>30</age>
<Address>
<id>1</id>
<province>广东省</province>
<city>广州市</city>
<area>越秀区</area>
<street>环市东路</street>
</Address>
</User>
</Message>
1、两个数据实体类
1）User类
/**
* @Description: 用户
*/
public class User { private Long id; //姓名
private String name;
//年龄
private Integer age;
//地址
private Address address; public Long getId() {
return id;
} public void setId(Long 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;
} public Address getAddress() {
return address;
} public void setAddress(Address address) {
this.address = address;
}
}
2）Address类
/**
*
* @Description: 地址
*/
public class Address { private Long id;
//省份
private String province;
//城市
private String city;
//区县
private String area;
//街道
private String street; public Long getId() {
return id;
} public void setId(Long id) {
this.id = id;
} public String getProvince() {
return province;
} public void setProvince(String province) {
this.province = province;
} public String getCity() {
return city;
} public void setCity(String city) {
this.city = city;
} public String getArea() {
return area;
} public void setArea(String area) {
this.area = area;
} public String getStreet() {
return street;
} public void setStreet(String street) {
this.street = street;
}
}
2、使用dom4j生成xml和解析xml的工具类
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map; import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter; /**
*
* @Description: Xml生成解析工具
* @author Luxh
*/
public class XmlUtil { /**
* 生成xml文档
* @param user 用户信息
* @return
*/
private static Document generateDocument(User user) { Document document = DocumentHelper.createDocument(); //添加元素 Message
Element messageElement = document.addElement("Message"); //给Message元素添加属性 xmlns:xs="http://www.w3.org/2001/XMLSchema"
messageElement.addAttribute("xmlns:xs", "http://www.w3.org/2001/XMLSchema"); //添加元素 User
Element userElement = messageElement.addElement("User"); //添加User子元素 id
Element idElement = userElement.addElement("id");
//给id元素赋值
idElement.setText(String.valueOf(user.getId())); //添加User子元素 name
Element nameElement = userElement.addElement("name");
//给name元素赋值
nameElement.setText(user.getName()); //添加User子元素 age
Element ageElement = userElement.addElement("age");
//给age元素赋值
ageElement.setText(String.valueOf(user.getAge())); //添加User子元素 Address
Element addressElement = userElement.addElement("Address"); //添加Address子元素 id
Element addressIdElement = addressElement.addElement("id");
//给id元素赋值
addressIdElement.setText(String.valueOf(user.getAddress().getId())); //添加Address子元素 province
Element provinceElement = addressElement.addElement("province");
//给province元素赋值
provinceElement.setText(user.getAddress().getProvince()); //添加Address子元素 city
Element cityElement = addressElement.addElement("city");
//给city元素赋值
cityElement.setText(user.getAddress().getCity()); //添加Address子元素 area
Element areaElement = addressElement.addElement("area");
//给area元素赋值
areaElement.setText(user.getAddress().getArea()); //添加Address子元素 street
Element streetElement = addressElement.addElement("street");
//给street元素赋值
streetElement.setText(user.getAddress().getStreet()); return document;
} /**
* 生成xml文件
*/
public static void generateXmlFile(User user) { Document document = generateDocument(user);
XMLWriter out = null; BufferedWriter bw = null;
OutputStreamWriter osw = null;
FileOutputStream fos = null; try {
File xmlFile = new File("D:/user.xml");//输出xml的路径
fos = new FileOutputStream(xmlFile);
osw = new OutputStreamWriter(fos,"UTF-8");//指定编码，防止写中文乱码
bw = new BufferedWriter(osw); //对xml输出格式化
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("UTF-8");
out = new XMLWriter(bw, format);
out.write(document); } catch (IOException e) {
e.printStackTrace();
}finally {
try {
if(out != null) {
out.close();
}
if(bw != null) {
bw.close();
}
if(osw != null) {
osw.close();
}
if(fos != null) {
fos.close();
} } catch (IOException e) {
e.printStackTrace();
}
}
} /**
* 解析xml文件
* @param xmlFile
* @return
* @throws DocumentException
*/
public static User analyzeXmlFile(File xmlFile) throws DocumentException { SAXReader saxReader = new SAXReader();
Document document = saxReader.read(xmlFile);
//获取根元素Message
Element messageElement = document.getRootElement(); //获取Message元素下的子元素
Iterator<Element> oneLevelElementItor = messageElement.elementIterator();
Map<String,String> userAttrMap = new HashMap<String,String>();
Map<String,String> addressAttrMap = new HashMap<String,String>(); while(oneLevelElementItor.hasNext()){
Element e1 = oneLevelElementItor.next();
System.out.println("Message子元素："+e1.getName());
//获取User元素下的子元素
Iterator<Element> twoLevelElementItor = e1.elementIterator();
while(twoLevelElementItor.hasNext()) {
Element e2 = twoLevelElementItor.next();
System.out.println("User子元素："+e2.getName());
userAttrMap.put(e2.getName(), e2.getText()); //获取Address下的子元素
if("Address".equals(e2.getName())) {
Iterator<Element> threeLevelElementItor = e2.elementIterator();
while(threeLevelElementItor.hasNext()) {
Element e3 = threeLevelElementItor.next();
System.out.println("Address子元素："+e3.getName());
addressAttrMap.put(e3.getName(), e3.getText());
} }
} } //将解析出来的数据封装成User
User user = new User();
user.setId(Long.valueOf(userAttrMap.get("id")));
user.setName(userAttrMap.get("name"));
user.setAge(Integer.valueOf(userAttrMap.get("age"))); Address address = new Address();
address.setId(Long.valueOf(addressAttrMap.get("id")));
address.setProvince(addressAttrMap.get("province"));
address.setCity(addressAttrMap.get("city"));
address.setArea(addressAttrMap.get("area"));
address.setStreet(addressAttrMap.get("street")); user.setAddress(address);
return user;
} }
3、测试
import java.io.File; import org.dom4j.DocumentException;
import org.junit.Test; public class UserXmlTest { /**
* 生成xml文件
*/
@Test
public void testGenerateXml() { //构造一个用户信息
User user = new User();
user.setId(1L);
user.setName("李寻欢");
user.setAge(30); Address address = new Address();
address.setId(1L);
address.setProvince("广东省");
address.setCity("广州市");
address.setArea("越秀区");
address.setStreet("环市东路"); user.setAddress(address); XmlUtil.generateXmlFile(user);
} /**
* 解析xml文件
* @throws DocumentException
*/
@Test
public void testAnalyzeXmlFile() throws DocumentException {
File xmlFile = new File("D:/user.xml");
User user = XmlUtil.analyzeXmlFile(xmlFile);
System.out.println("user'name is :"+user.getName());
System.out.println("user'address'province is :"+user.getAddress().getProvince());
}
}