利用反射与dom4j读取javabean生成对应XML和读取XML得到对应的javabean对象集合

1.利用反射与dom4j读取javabean生成对应XML

 

写道

/**
* DMO4J写入XML
* @param obj 泛型对象
* @param entityPropertys 泛型对象的List集合
* @param Encode XML自定义编码类型(推荐使用GBK)
* @param XMLPathAndName XML文件的路径及文件名
*/
public void writeXmlDocument(T obj, List<T> entityPropertys, String Encode,
String XMLPathAndName) {
          long lasting = System.currentTimeMillis();//效率检测 

         try { 
                 XMLWriter writer = null;// 声明写XML的对象 
                 OutputFormat format = OutputFormat.createPrettyPrint(); 
                 format.setEncoding(Encode);// 设置XML文件的编码格式 

                 String filePath = XMLPathAndName;//获得文件地址 
                 File file = new File(filePath);//获得文件 
        
                 if (file.exists()) { 
                         file.delete(); 
                 } 
                 // 新建student.xml文件并新增内容 
                 Document document = DocumentHelper.createDocument(); 
                 String rootname = obj.getClass().getSimpleName();//获得类名 
                 Element root = document.addElement(rootname + "s");//添加根节点 
                 Field[] properties = obj.getClass().getDeclaredFields();//获得实体类的所有属性 

                 for (T t : entityPropertys) { //递归实体 
                         Element secondRoot = root.addElement(rootname); //二级节点 

                         for (int i = 0; i < properties.length; i++) { 
                         //反射get方法 
                         Method meth = t.getClass().getMethod( "get"  + properties[i].getName().substring(0, 1) 
                         .toUpperCase() 
                         + properties[i].getName().substring(1)); 
                         //为二级节点添加属性，属性值为对应属性的值 
                         secondRoot.addElement(properties[i].getName()).setText( 
                         meth.invoke(t).toString()); 
                         } 
                 } 
         //生成XML文件 
         writer = new XMLWriter(new FileWriter(file), format); 
         writer.write(document); 
         writer.close(); 
         long lasting2 = System.currentTimeMillis(); 
         System.out.println("写入XML文件结束,用时"+(lasting2 - lasting)+"ms"); 
         } catch (Exception e) { 
                 System.out.println("XML文件写入失败"); 
         }

}

 测试该方法

/**
* DOM4J读写XML示例
*
* @param args
* @throws Exception
*/

public static void main(String[] args) { 
         DOM4JTest<User> d = new DOM4JTest<User>(); 
         User user = new User(); 
         User user1 = new User("姓名1", "18", "男"); 
         User user2 = new User("姓名2", "19", "女"); 
         User user3 = new User("石头", "20", "女"); 



         List<User> users = new ArrayList<User>(); 
         users.add(user1); 
         users.add(user2); 
         users.add(user3); 

         d.writeXmlDocument(user, users, "GBK", "WebRoot\\WEB-INF\\student.xml");

}

 xml结果

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<?xml version="1.0" encoding="GBK"?>

<Users> 
         <User> 
                 <name>姓名1</name> 
                  <age>18</age> 
                  <sax>男</sax> 
          </User> 
          <User> 
                   <name>姓名2</name> 
                   <age>19</age> 
                   <sax>女</sax> 
           </User> 
           <User> 
                   <name>石头</name> 
                   <age>20</age> 
                   <sax>女</sax> 
           </User>
</Users>

 2.读取XML得到对应的javabean对象集合

/**
*
* @param XMLPathAndName XML文件的路径和地址
* @param t 泛型对象
* @return
*/


@SuppressWarnings("unchecked")
public List<T> readXML(String XMLPathAndName, T t) { 
            long lasting = System.currentTimeMillis();//效率检测 
            List<T> list = new ArrayList<T>();//创建list集合
try { 
            File f = new File(XMLPathAndName);//读取文件 
            SAXReader reader = new SAXReader(); 
            Document doc = reader.read(f);//dom4j读取 
            Element root = doc.getRootElement();//获得根节点 
            Element foo;//二级节点 
            Field[] properties = t.getClass().getDeclaredFields();//获得实例的属性 
            //实例的get方法 
            Method getmeth; 
            //实例的set方法 
            Method setmeth; 

            for (Iterator i = root.elementIterator(t.getClass().getSimpleName()); i.hasNext();) {//遍历                      t.getClass().getSimpleName()节点 
                       foo = (Element) i.next();//下一个二级节点 
                       t=(T)t.getClass().newInstance();//获得对象的新的实例 

                       for (int j = 0; j < properties.length; j++) {//遍历所有孙子节点 
                       //实例的set方法 
                                  setmeth = t.getClass().getMethod(  "set"  + properties[j].getName().substring(0, 1) .toUpperCase() 
                                  + properties[j].getName().substring(1),properties[j].getType()); 
                                  //properties[j].getType()为set方法入口参数的参数类型(Class类型) 
                                  setmeth.invoke(t, foo.elementText(properties[j].getName()));

                      //将对应节点的值存入 
                       } 
                       list.add(t); 
            }
} catch (Exception e) {
e.printStackTrace();
}
long lasting2 = System.currentTimeMillis();
System.out.println("读取XML文件结束,用时"+(lasting2 - lasting)+"ms");
return list;
}

 测试该 方法

public static void main(String[] args) {
DOM4JTest<User> d = new DOM4JTest<User>();
User user = new User();

List<User> list= d.readXML("WebRoot\\WEB-INF\\student.xml",user);
System.out.println("XML文件读取结果");
for(int i =0;i<list.size();i++){
User usename=(User)list.get(i);
System.out.println("name"+usename.getName());
System.out.println("age"+usename.getAge());
System.out.println("sax"+usename.getSax());

}

}

 查看结果

name姓名1
age18
sax男
name姓名2
age19
sax女
name石头
age20
sax女