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dom4j将xml转换成对象

2015-08-03 23:29 381 查看

dom4j将xml转换成对象

package test;

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.tree.DefaultAttribute;

public class XmlUtil {

/**
* xml字符串转换成bean对象
*
* @param xmlStr xml字符串
* @param clazzMap 待转换的class包括对象属性的class
* @return 转换后的对象
*/
public static Object xmlStrToBean(String xmlStr,Map<String,Class>  clazzMap) {
Object obj = null;
try {
// 将xml格式的数据转换成Map对象

Map<String, Object> map = new HashMap<String, Object>();
//将xml格式的字符串转换成Document对象
Document doc = DocumentHelper.parseText(xmlStr);
//获取根节点
Element root = doc.getRootElement();

//将map对象的数据转换成Bean对象
obj = mapToBean(root, clazzMap);
} catch(Exception e) {
e.printStackTrace();
}
return obj;
}

/**
* 将Map对象通过反射机制转换成Bean对象
*
* @param clazzMap 待转换的class包括对象属性的class
* @return 转换后的Bean对象
* @throws Exception 异常
*/
public static Object mapToBean( Element root,Map<String,Class> clazzMap) throws Exception {
//获取根节点下的所有元素
List children = root.elements();
List<DefaultAttribute> attrs= root.attributes();

Map<String, Object> map = new HashMap<String, Object>();
if(children != null && children.size() > 0) {
for(int i = 0; i < children.size(); i++) {
Element child = (Element)children.get(i);
if(!child.isTextOnly()){
Object ob= mapToBean(child,clazzMap);
map.put(child.getName(),ob);
}else{
map.put(child.getName(), child.getTextTrim());
}

}
}
for(DefaultAttribute att:attrs){
map.put(att.getName(),att.getText());
}

Class clazz=clazzMap.get(root.getName());
Object obj = clazz.newInstance();
if(map != null && map.size() > 0) {
for(Map.Entry<String, Object> entry : map.entrySet()) {
String propertyName = entry.getKey();
Object value = entry.getValue();
String setMethodName = "set"
+ propertyName.substring(0, 1).toUpperCase()
+ propertyName.substring(1);
Field field = getClassField(clazz, propertyName);
Class fieldTypeClass = field.getType();
value = convertValType(value, fieldTypeClass);
clazz.getMethod(setMethodName, field.getType()).invoke(obj, value);
}
}
return obj;
}

/**
* 将Object类型的值，转换成bean对象属性里对应的类型值
*
* @param value Object对象值
* @param fieldTypeClass 属性的类型
* @return 转换后的值
*/
private static Object convertValType(Object value, Class fieldTypeClass) {
Object retVal = null;
if(Long.class.getName().equals(fieldTypeClass.getName())
|| long.class.getName().equals(fieldTypeClass.getName())) {
retVal = Long.parseLong(value.toString());
} else if(Integer.class.getName().equals(fieldTypeClass.getName())
|| int.class.getName().equals(fieldTypeClass.getName())) {
retVal = Integer.parseInt(value.toString());
} else if(Float.class.getName().equals(fieldTypeClass.getName())
|| float.class.getName().equals(fieldTypeClass.getName())) {
retVal = Float.parseFloat(value.toString());
} else if(Double.class.getName().equals(fieldTypeClass.getName())
|| double.class.getName().equals(fieldTypeClass.getName())) {
retVal = Double.parseDouble(value.toString());
} else {
retVal = value;
}
return retVal;
}

/**
* 获取指定字段名称查找在class中的对应的Field对象(包括查找父类)
*
* @param clazz 指定的class
* @param fieldName 字段名称
* @return Field对象
*/
private static Field getClassField(Class clazz, String fieldName) {
if( Object.class.getName().equals(clazz.getName())) {
return null;
}
Field []declaredFields = clazz.getDeclaredFields();
for (Field field : declaredFields) {
if (field.getName().equals(fieldName)) {
return field;
}
}

Class superClass = clazz.getSuperclass();
if(superClass != null) {// 简单的递归一下
return getClassField(superClass, fieldName);
}
return null;
}

public static String getXML(){
StringBuffer sb=new StringBuffer();
sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
sb.append("<note name=\"xian\">");
sb.append("<to>George</to>");
sb.append("<Student>");
sb.append("<name>xian</name>");
sb.append("<classRoom>");
sb.append("<name>Ap111111</name>");
sb.append("</classRoom>");
sb.append("<age>13</age>");
sb.append("</Student>");
sb.append("<from>John</from>");
sb.append("<heading>Reminder</heading>");
sb.append("<Body>Don't forget the meeting!</Body>");
sb.append("</note>");
return sb.toString();
}

public static void main(String[] args){
Map<String ,Class> mapClass=new HashMap<String,Class>();
mapClass.put("note", Note.class);
mapClass.put("Student", Student.class);
mapClass.put("classRoom", ClassRoom.class);
Note note=(Note)xmlStrToBean(getXML(),mapClass);
System.out.println(note.getName()+"--"+note.getTo()+"--"/*+note.getStudent().getAge()+note.getStudent().getClassRoom().getName()*/);
}

}

package test;

public class Note {
public String to;
public String from;
public String heading;
public String Body;
public String name;
public Student Student;
public String getTo() {
return to;
}
public void setTo(String to) {
this.to = to;
}
public String getFrom() {
return from;
}
public void setFrom(String from) {
this.from = from;
}
public String getHeading() {
return heading;
}
public void setHeading(String heading) {
this.heading = heading;
}

public String getBody() {
return Body;
}
public void setBody(String body) {
Body = body;
}

public Student getStudent() {
return Student;
}
public void setStudent(Student student) {
Student = student;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}

}

package test;

public class Student {
public String name;
public String age;
public ClassRoom classRoom;
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 ClassRoom getClassRoom() {
return classRoom;
}
public void setClassRoom(ClassRoom classRoom) {
this.classRoom = classRoom;
}

}

package test;

public class ClassRoom {
public String name;

public String getName() {
return name;
}

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

}

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标签： dom4j java

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