xml转list

大家在解析大量相似xml文件的时候是否会遇到这样一个问题：冗余的代码去set定义的实体对象Bean的值，基本都是一样的操作

而且毫无任何代码价值可言所以在这写了一个简单的例子，类封装了几个方法你只需传入xml文件，或者URL路径。和Bean.Class 类名

即可自动传回你需要的List集合。

需要解析的xml文件

<?xml version="1.0" encoding="UTF-8"?>

<messages>

<resultCode>0</resultCode>

<totalCount>2</totalCount>

<UserLists>

<UserList>

<userId>0</userId>

<loginName>张三0</loginName>

<email>[e-mail]</email>

<userType>1</userType>

<status>1</status>

<roleType>1</roleType>

<registerIP>192.168.1.0</registerIP>

<registerTime>2012-06-07 15:35:33</registerTime>

</UserList>

<UserList>

<userId>1</userId>

<loginName>张三1</loginName>

<email>[e-mail]</email>

<userType>1</userType>

<status>1</status>

<roleType>1</roleType>

<registerIP>192.168.1.1</registerIP>

<registerTime>2012-06-07 15:35:33</registerTime>

</UserList>

</UserLists>

</messages>

在进行相关操作中需要如下包：

下面是贴出的代码：

package com.jeecms.common.util;

import java.lang.reflect.Field;

import java.net.URL;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

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.io.SAXReader;

public class XmlParseUtil {

/**

* 反射设置实体不同类型字段的值 <暂时只支持 日期 字符串 boolean Integer值设置 待扩建>

*

* @param field

* @param obj

* @param value

* @throws Exception

*/

public static void convertValue(Field field,Object obj,String value)

throws Exception {

SimpleDateFormat sim = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

if (field.getGenericType().toString().equals("class java.lang.Integer")) {

field.set(obj,Integer.parseInt(value));

} else if (field.getGenericType().toString().equals("boolean")) {

field.set(obj,Boolean.parseBoolean(value));

} else if (field.getGenericType().toString().equals(

"class java.util.Date")) {

field.set(obj,sim.parse(value));

} else {

field.set(obj,value);

}

}

/**

* 解析xml文件返回保存cls的List集合，如果返回码resultCode=1时则返回List为null

*

* @param xml

* @param cls

* @return

* @throws Exception

*/

@SuppressWarnings("unchecked")

public static List<?> parseXml2List(String xml,Class<?> cls)

throws Exception {

List<Object> lists = null;

Document doc = DocumentHelper.parseText(xml);

Element et = doc.getRootElement();

String root = et.getName();

// 查看返回码是否为真.

List<Element> list = doc.selectNodes("//" + root + "/resultCode");

if (!list.isEmpty() && list.size() > 0) {

Element element = list.get(0);

String returnResult = element.getText();

if (returnResult.equals("0")) {

List<Element> father = doc.selectNodes("//" + root + "/"+ cls.getSimpleName()+"s");

//判断对象父节点是否有包含数据

if(father!=null&&!father.isEmpty()&&father.size()==1){

List<Element> userLists = father.get(0).elements();

if (userLists!=null&&!list.isEmpty()) {

lists = new ArrayList<Object>();

for (Element e : userLists) {

List<Element> li = e.elements();

Class<?> cl = (Class<?>) Class.forName(cls.getName());

Object ob = cl.newInstance();

for (Element element2 : li) {

String name = element2.getName();

String value = element2.getText();

Field field = ob.getClass().getDeclaredField(name);

field.setAccessible(true);

convertValue(field,ob,value);

}

lists.add(ob);

}

}

}

}

}

return lists;

}

/**

* 解析xml文件返回保存cls的List集合，如果返回码resultCode=1时则返回List为null

*

* @param url

* @param cls

* @return

* @throws Exception

*/

@SuppressWarnings("unchecked")

public static List<?> parseXml2List(URL url,Class<?> cls)

throws Exception {

List<Object> lists = null;

SAXReader saxReader = new SAXReader();

Document doc = saxReader.read(url);

Element et = doc.getRootElement();

String root = et.getName();

// 查看返回码是否为真.

List<Element> list = doc.selectNodes("//" + root + "/resultCode");

if (!list.isEmpty() && list.size() > 0) {

Element element = list.get(0);

String returnResult = element.getText();

if (returnResult.equals("0")) {

List<Element> father = doc.selectNodes("//" + root + "/"+ cls.getSimpleName()+"s");

//判断对象父节点是否有包含数据

if(father!=null&&!father.isEmpty()&&father.size()==1){

List<Element> userLists = father.get(0).elements();

if (userLists!=null&&!list.isEmpty()) {

lists = new ArrayList<Object>();

for (Element e : userLists) {

List<Element> li = e.elements();

Class<?> cl = (Class<?>) Class.forName(cls.getName());

Object ob = cl.newInstance();

for (Element element2 : li) {

String name = element2.getName();

String value = element2.getText();

Field field = ob.getClass().getDeclaredField(name);

field.setAccessible(true);

convertValue(field,value);

}

lists.add(ob);

}

}

}

}

}

return lists;

}

/**

* 解析xml文件返回保存Map的集合，map中可能包含key值为returnCode、desc、totalCount等单字段.

* 也可能包含存储对象为List<cls>的集合值.

* 获取List值key cls_List

* @param requestPath

* @param cls

* @return map

* @throws Exception

*/

@SuppressWarnings("unchecked")

public static Map<String,Object> parseXml2Map(String requestPath,

Class<?> cls) throws Exception {

Map<String,Object> maps = new HashMap<String,Object>();

List<Object> lists = new ArrayList<Object>();

SAXReader saxReader = new SAXReader();

//Document doc = saxReader.read(new File(requestPath));

Document doc = saxReader.read(new URL(requestPath));

Element et = doc.getRootElement();

// 标记List是否为空

// boolean bool = true ;

// 根节点名字

List<Element> rList = et.elements();

for (Element element : rList) {

List<Element> rLists = element.elements();

if (!rLists.isEmpty() && rLists.size() > 0) {

//bool = false;

// 判断二级节点

for (Element e : rLists) {

List<Element> li = e.elements();

Class<?> cl = (Class<?>) Class.forName(cls.getName());

Object ob = cl.newInstance();

for (Element element2 : li) {

String name = element2.getName();

String value = element2.getText();

Field field = ob.getClass().getDeclaredField(name);

field.setAccessible(true);

convertValue(field,value);

}

lists.add(ob);

}

} else {

maps.put(element.getName(),element.getText());

}

maps.put(cls.getSimpleName() + "_List",lists);

}

return maps;

}

/**

* 只获取返回码0为保存成功(true)1为保存失败(false)

*/

@SuppressWarnings("unchecked")

public static boolean parseXmlReturnCode(String xml) {

boolean bool = false;

try {

Document doc = DocumentHelper.parseText(xml);

Element et = doc.getRootElement();

String root = et.getName();

// 查看返回码是否为真.

List<Element> list = doc.selectNodes("//" + root + "/resultCode");

if (!list.isEmpty() && list.size() > 0) {

Element element = list.get(0);

String returnResult = element.getText();

if (returnResult.equals("0")) {

bool = true;

}

}

} catch (Exception e) {

e.printStackTrace();

}

return bool;

}

}

////////////////////

很多朋友遇到xml，map和json互转的问题，在开发中xml和json越来越重要了。我就把我的工具类贴上来。

[java] view plain copy print ?

1. package com.shine.framework.core.util;
3. import java.io.ByteArrayOutputStream;
4. import java.util.ArrayList;
5. import java.util.HashMap;
6. import java.util.Iterator;
7. import java.util.List;
8. import java.util.Map;
10. import net.sf.json.JSON;
11. import net.sf.json.JSONSerializer;
12. import net.sf.json.xml.XMLSerializer;
14. import org.dom4j.Document;
15. import org.dom4j.DocumentHelper;
16. import org.dom4j.Element;
17. import org.dom4j.io.OutputFormat;
18. import org.dom4j.io.XMLWriter;
20. /**
21. * common xml conver utility
22. *
23. * @author [e-mail]
24. * @version Framework 2010.10.26
25. * @url http://blog.csdn.net/arjick/article/details/6251777
26. */
27. public class XmlConverUtil {
28. /**
29. * map to xml xml <node><key label="key1">value1</key><key
30. * label="key2">value2</key>......</node>
31. *
32. * @param map
33. * @return
34. */
35. public static String maptoXml(Map map) {
36. Document document = DocumentHelper.createDocument();
37. Element nodeElement = document.addElement("node");
38. for (Object obj : map.keySet()) {
39. Element keyElement = nodeElement.addElement("key");
40. keyElement.addAttribute("label",String.valueOf(obj));
41. keyElement.setText(String.valueOf(map.get(obj)));
42. }
43. return doc2String(document);
44. }
46. /**
47. * list to xml xml <nodes><node><key label="key1">value1</key><key
48. * label="key2">value2</key>......</node><node><key
49. * label="key1">value1</key><key
50. * label="key2">value2</key>......</node></nodes>
51. *
52. * @param list
53. * @return
54. */
55. public static String listtoXml(List list) throws Exception {
56. Document document = DocumentHelper.createDocument();
57. Element nodesElement = document.addElement("nodes");
58. int i = 0;
59. for (Object o : list) {
60. Element nodeElement = nodesElement.addElement("node");
61. if (o instanceof Map) {
62. for (Object obj : ((Map) o).keySet()) {
63. Element keyElement = nodeElement.addElement("key");
64. keyElement.addAttribute("label",String.valueOf(obj));
65. keyElement.setText(String.valueOf(((Map) o).get(obj)));
66. }
67. } else {
68. Element keyElement = nodeElement.addElement("key");
69. keyElement.addAttribute("label",String.valueOf(i));
70. keyElement.setText(String.valueOf(o));
71. }
72. i++;
73. }
74. return doc2String(document);
75. }
77. /**
78. * json to xml {"node":{"key":{"@label":"key1","#text":"value1"}}} conver
79. * <o><node class="object"><key class="object"
80. * label="key1">value1</key></node></o>
81. *
82. * @param json
83. * @return
84. */
85. public static String jsontoXml(String json) {
86. try {
87. XMLSerializer serializer = new XMLSerializer();
88. JSON jsonObject = JSONSerializer.toJSON(json);
89. return serializer.write(jsonObject);
90. } catch (Exception e) {
91. e.printStackTrace();
92. }
93. return null;
94. }
96. /**
97. * xml to map xml <node><key label="key1">value1</key><key
98. * label="key2">value2</key>......</node>
99. *
100. * @param xml
101. * @return
102. */
103. public static Map xmltoMap(String xml) {
104. try {
105. Map map = new HashMap();
106. Document document = DocumentHelper.parseText(xml);
107. Element nodeElement = document.getRootElement();
108. List node = nodeElement.elements();
109. for (Iterator it = node.iterator(); it.hasNext();) {
110. Element elm = (Element) it.next();
111. map.put(elm.attributeValue("label"),elm.getText());
112. elm = null;
113. }
114. node = null;
115. nodeElement = null;
116. document = null;
117. return map;
118. } catch (Exception e) {
119. e.printStackTrace();
120. }
121. return null;
122. }
124. /**
125. * xml to list xml <nodes><node><key label="key1">value1</key><key
126. * label="key2">value2</key>......</node><node><key
127. * label="key1">value1</key><key
128. * label="key2">value2</key>......</node></nodes>
129. *
130. * @param xml
131. * @return
132. */
133. public static List xmltoList(String xml) {
134. try {
135. List<Map> list = new ArrayList<Map>();
136. Document document = DocumentHelper.parseText(xml);
137. Element nodesElement = document.getRootElement();
138. List nodes = nodesElement.elements();
139. for (Iterator its = nodes.iterator(); its.hasNext();) {
140. Element nodeElement = (Element) its.next();
141. Map map = xmltoMap(nodeElement.asXML());
142. list.add(map);
143. map = null;
144. }
145. nodes = null;
146. nodesElement = null;
147. document = null;
148. return list;
149. } catch (Exception e) {
150. e.printStackTrace();
151. }
152. return null;
153. }
155. /**
156. * xml to json <node><key label="key1">value1</key></node> 转化为
157. * {"key":{"@label":"key1","#text":"value1"}}
158. *
159. * @param xml
160. * @return
161. */
162. public static String xmltoJson(String xml) {
163. XMLSerializer xmlSerializer = new XMLSerializer();
164. return xmlSerializer.read(xml).toString();
165. }
167. /**
168. *
169. * @param document
170. * @return
171. */
172. public static String doc2String(Document document) {
173. String s = "";
174. try {
175. // 使用输出流来进行转化
176. ByteArrayOutputStream out = new ByteArrayOutputStream();
177. // 使用UTF-8编码
178. OutputFormat format = new OutputFormat(" ",true,"UTF-8");
179. XMLWriter writer = new XMLWriter(out,format);
180. writer.write(document);
181. s = out.toString("UTF-8");
182. } catch (Exception ex) {
183. ex.printStackTrace();
184. }
185. return s;
186. }
187. }

//////////////

将xml转换成Map,能够应对不用结构的xml,而不是只针对固定格式的xml.
转换规则:
1.主要是Map与List的互相嵌套
2.同名称的节点会被装进List

示例：

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.dom4j.Document;
import org.dom4j.Element;
public class XmlUtils {
@SuppressWarnings("unchecked")
public static Map<String,Object> Dom2Map(Document doc){
Map<String,Object> map = new HashMap<String,Object>();
if(doc == null)
return map;
Element root = doc.getRootElement();
for (Iterator iterator = root.elementIterator(); iterator.hasNext();) {
Element e = (Element) iterator.next();
List list = e.elements();
if(list.size() > 0){
map.put(e.getName(),Dom2Map(e));
}else
map.put(e.getName(),e.getText());
}
return map;
}
@SuppressWarnings("unchecked")
public static Map Dom2Map(Element e){
Map map = new HashMap();
List list = e.elements();
if(list.size() > 0){
for (int i = 0;i < list.size(); i++) {
Element iter = (Element) list.get(i);
List mapList = new ArrayList();

if(iter.elements().size() > 0){
Map m = Dom2Map(iter);
if(map.get(iter.getName()) != null){
Object obj = map.get(iter.getName());
if(!obj.getClass().getName().equals("java.util.ArrayList")){
mapList = new ArrayList();
mapList.add(obj);
mapList.add(m);
}
if(obj.getClass().getName().equals("java.util.ArrayList")){
mapList = (List) obj;
mapList.add(m);
}
map.put(iter.getName(),mapList);
}else
map.put(iter.getName(),m);
}
else{
if(map.get(iter.getName()) != null){
Object obj = map.get(iter.getName());
if(!obj.getClass().getName().equals("java.util.ArrayList")){
mapList = new ArrayList();
mapList.add(obj);
mapList.add(iter.getText());
}
if(obj.getClass().getName().equals("java.util.ArrayList")){
mapList = (List) obj;
mapList.add(iter.getText());
}
map.put(iter.getName(),iter.getText());
}
}
}else
map.put(e.getName(),e.getText());
return map;
}
}
测试类：

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Map;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;

public class XmlToMapDemo {
public static void main(String[] args) throws IOException,
DocumentException {

FileInputStream fis = new FileInputStream("d://a.xml");
byte[] b = new byte[fis.available()];
fis.read(b);
String str = new String(b);

Document doc = DocumentHelper.parseText(str);

System.out.println(doc.asXML());

long beginTime = System.currentTimeMillis();

Map<String,Object> map = XmlUtils.Dom2Map(doc);

System.out.println(map.toString());

System.out.println("Use time:"+(System.currentTimeMillis()-beginTime));

} }