利用dom4j将 java bean生成xml


利用dom4j将 java bean生成xml


本文利用dom4j对一个PoJo,的属性,方法生成XML

 

需要的包

dom4j-1.6.1.jar

jaxen-1.1-beta-6.jar

----------------------------------------------------------------------------------------------------

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.sql.Time;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.XMLWriter;

class MyBean {
       String id ;
       String name ;
       MyBean(){}
       MyBean(String id, String name){
            this.id = id;
            this.name = name;
       }
      public void say(){}
      public String tell(String msg) throws Exception{
            return msg;
      }
}

 


/**
 * 
 * 将java bean 互换 XML
 */
public class BeansToXml {
 
 public static void main(String args[]){
        List l = new ArrayList();
        MyBean b = new MyBean("a","b");
        l.add(b);
         b = new MyBean("c","d");
         l.add(b);
       createXm(b);
   }
 
 @SuppressWarnings("unchecked")
 public static void createXm(final Object obj){  
        String clsName = obj.getClass().getName();
        clsName = clsName.substring(clsName.lastIndexOf(".")+1,clsName.length());
        System.out.println(clsName);
  
          // 根据类名生成root
         Document doc = DocumentHelper.createDocument();
         Element root = doc.addElement( clsName);
         root.addComment(obj.getClass().getName()+" 的xml定义");
  
         // bean属性
          Element fieldsElems = root.addElement("fields");  
          Class cls = obj.getClass();
          Field[] fields = cls.getDeclaredFields();
         String fieldName = "";
          for(Field f :fields ){
                   f.setAccessible(true);
                  fieldName = f.getName();
                  fieldsElems.addElement(fieldName);
           }
  
          // 方法
           Element methodElems = root.addElement("methods");
           Method[] methods = cls.getDeclaredMethods();
           String methodName = "";
            for(Method m :methods ){
           methodName = m.getName();
            Element methodElem = methodElems.addElement(methodName);
            // 生成这个方法的详细说明
            createMethodElem(methodElem,m);
      }
   
         // 生成xml
         String filename ="c:/a.xml";
         XMLWriter writer;
         try {
              writer = new XMLWriter(new FileWriter(new File(filename )));
             writer.write(doc);
              writer.close();
         } catch (IOException e) {
              e.printStackTrace();
         }
       }
 
     /**
      //外部传入
       
           java.lang.String
           java.lang.String
           java.lang.Exception,
        
 
   
 
  */
 @SuppressWarnings("unchecked")
 public static void createMethodElem( Element methodElem , Method m ){
         // 参数
         Class[] params = m.getParameterTypes();
         // 返回值
        Class   returnType = m.getReturnType();
       // 返回值
       Class[] exceptions = m.getExceptionTypes();
  
          Element paramsElem = methodElem.addElement("params"); //
        //生成参数 
        StringBuffer sb = new StringBuffer();
        String str = "";
        Element paramType = paramsElem.addElement("param-type");
        for (Class type : params){
             sb.append(type.getName()).append(",");
         }
         str = sb.toString();
         paramType.addText(str);
  
         // 返回值
         Element returnElem = paramsElem.addElement("return-type");
         sb.delete(0, sb.length());
         sb.append(returnType.getName()).append(",");
         returnElem.addText( sb.toString());
  
        // 异常
        Element exceptionElem = paramsElem.addElement("exceptions");
        sb.delete(0, sb.length());
        for (Class exception : exceptions){
            sb.append(exception.getName()).append(",");
       }
       exceptionElem.addText(sb.toString());  
    }

 

---------------------------------------------------------------------------XML的结果--------------------------------

 

  
 
          
         
 

 
       
                
                        
                       
              

         

        
                
                    java.lang.String,
                      java.lang.Exception,
                

         

      


 

 

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