大家在解析大量相似xml文件的時候是否會遇到這樣一個問題：冗餘的代碼去set定義的實體對象Bean的值，基本都是一樣的操作
而且毫無任何代碼價值可言所以在這寫了一個簡單的例子，類封裝了幾個方法你只需傳入xml文件，或者URL路徑。和Bean.Class 類名
即可自動傳回你需要的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>張三0</loginName>
<email>[email protected]</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>張三1</loginName>
<email>[email protected]</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>
在進行相關操作中需要如下包：
下面是貼出的代碼：
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 {
/**
* 反射設置實體不同類型字段的值 <暫時只支持 日期 字符串 boolean Integer值設置 待擴建>
*
* @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，如果返回碼resultCode=1時則返回List爲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();
// 查看返回碼是否爲真.
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");
//判斷對象父節點是否有包含數據
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，如果返回碼resultCode=1時則返回List爲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();
// 查看返回碼是否爲真.
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");
//判斷對象父節點是否有包含數據
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Map的集合，map中可能包含key值爲returnCode、desc、totalCount等單字段.
* 也可能包含存儲對象爲List<cls>的集合值.
* 獲取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();
// 標記List是否爲空
// boolean bool = true ;
// 根節點名字
List<Element> rList = et.elements();
for (Element element : rList) {
List<Element> rLists = element.elements();
if (!rLists.isEmpty() && rLists.size() > 0) {
//bool = false;
// 判斷二級節點
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, ob, value);
}
lists.add(ob);
}
} else {
maps.put(element.getName(), element.getText());
}
maps.put(cls.getSimpleName() + "_List", lists);
}
return maps;
}
/**
* 只獲取返回碼0爲保存成功(true)1爲保存失敗(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();
// 查看返回碼是否爲真.
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;
}
}