利用dom4j将 java bean生成xml_dom4j的beanwriter-优快云博客

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<Object> l = new ArrayList<Object>();
       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();
         }
      }

    /**
    <MethodName> //外部传入
        <params>
           <param-type>java.lang.String</param-type>
           <return-type>java.lang.String </return-type>
           <exceptions> java.lang.Exception,</exceptions>
         </params>
    </MethodName>
*/
@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"); // <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--------------------------------

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

<fields>
         <id />
        <name />
</fields>
<methods>
      <say>
              <params>
                     <param-type></param-type>
                      <exceptions></exceptions>
               </params>
        </say>
       <tell>
             <params>
                    <param-type>java.lang.String,</param-type>
                   <exceptions>java.lang.Exception,</exceptions>
             </params>
       </tell>
     </methods>
</MyBean>