【转】JDOM解析处理xml

转自http://qingbyqing.iteye.com/blog/978113

1.解析xml

package
 com.qingbyqing.xmlParse;
import
 java.io.IOException;
import
 java.util.List;

import
 org.jdom.Attribute;
import
 org.jdom.Document;
import
 org.jdom.Element;
import
 org.jdom.JDOMException;
import
 org.jdom.input.SAXBuilder;

/**
 * 解析xml
 * @author qingbyqing
 * @date 2011-3-29
 */
public
 
class
 XmlPasreUtil {

    Element root=null
;
    Document doc=null
;

    /**
     * 获得根元素
     * @param fileName 用于指定的xml文件名
     * @return
     */
    public
  Element getRoot(String fileName){
        //1.创建解析对象
        //2.解析对象调用build方法建立文档对象
        //3.文档对象获得根元素
        SAXBuilder builder = new
 SAXBuilder(
false
);
        try
 {
             doc = builder.build(fileName);
        } catch
 (JDOMException e) {

            e.printStackTrace();
        } catch
 (IOException e) {

            e.printStackTrace();
        }
           Element root = doc.getRootElement();
        return
 root;
    }
    /**
     * 获取xml的所有信息
     * @param root 传入一个根元素对象
     */
    public
 
void
 getElementInfo(Element root){

        //遍历跟元素
        List<?> flist = root.getChildren("floor"
);
       for
(
int
 i=
0
;i<flist.size();i++){

           Element floor =(Element) flist.get(i);

           String level = floor.getAttributeValue("level"
);
          p("第"
+level+
"层"
);

          List<?> rlist = floor.getChildren("room"
);

          for
(
int
 j=
0
;j<rlist.size();j++){


          Element room = (Element)rlist.get(j);

            String id=room.getAttributeValue("id"
);

            String rep=room.getChild("represent"
).getText();
            String tel=room.getChild("telephone"
).getText();
            p("寝室编号："
+id+
"  负责人："
+rep+
"    寝室号码："
+tel);

          }
       }


    }


    /**
     * @param args
     */
    public
 
static
 
void
 main(String[] args) {

            XmlPasreUtil pasre = new
 XmlPasreUtil();

            Element root=pasre.getRoot("I:\\xml\\flats.xml"
);
            pasre.getElementInfo(root);
    }

    public
 
void
 p(String str){
        System.out.println(str);
    }

}

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2.创建xml

package
 com.qingbyqing.xmlParse;

import
 java.io.FileWriter;
import
 java.io.IOException;

import
 org.jdom.Attribute;
import
 org.jdom.Comment;
import
 org.jdom.Document;
import
 org.jdom.Element;
import
 org.jdom.output.Format;
import
 org.jdom.output.XMLOutputter;

/**
 * 创建一个xml
 * @author qingbyqing
 * @date 2011-3-29
 */
public
 
class
 XmlCreateUtil {

    Element root=null
;
//跟元素
    Document doc=null
;
//文档对象


    /**
     * 创建xml
     * @param ajax
     */

    public
 
void
 createRootElement(String[] ajaxs){

        //1.根据数组创建跟元素
        //2.建立解释内容
        //3.建立子元素


         root = new
 Element(
"ajax"
);

         //建立解释内容
         Comment comment = new
 Comment(
"简单的xml示例"
);
         root.addContent(comment);

         //建立子元素
         for
(
int
 i=
0
;i<ajaxs.length;i++){
             Element ajax = new
 Element(
"ajax"
);
//子元素标签
             ajax.addContent(ajaxs[i]);//子元素内容
             Attribute id = new
 Attribute(
"id"
,
new
 Integer(i).toString());
//子元素属性

             ajax.setAttribute(id);
             root.addContent(ajax);

         }
    }

    public
 
void
 outputXml(String fileName){

         //1.根据跟元素创建文档
        //2.创建输出对象
        //3.创建输出格式对象
        //4.格式化文档
        //5.创建文件输出对象
        //6.输出对象
        doc =new
 Document(root);
        XMLOutputter out = new
 XMLOutputter();
        Format format = Format.getPrettyFormat();
        //设置输出格式
        format.setIndent(" "
);

        format.setEncoding("gbk"
);

        out.setFormat(format);

        try
 {
            FileWriter fwt = new
 FileWriter(fileName);
            out.output(doc, fwt);
            fwt.flush();
            fwt.close();
        } catch
 (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public
 
static
 
void
 main(String args[]){

        String[] ajaxs={"JAVASCRIPT"
,
"HTML"
,
"CSS"
,
"DOM"
,
"XMLHTTPREQUEST"
};

          XmlCreateUtil cu = new
 XmlCreateUtil();
          cu.createRootElement(ajaxs);
          cu.outputXml("I:\\xml\\ajaxs.xml"
);

    }
}

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3.修改xml

package
 com.qingbyqing.xmlParse;

import
 java.io.FileWriter;
import
 java.io.IOException;

import
 org.jdom.Document;
import
 org.jdom.Element;
import
 org.jdom.JDOMException;
import
 org.jdom.input.SAXBuilder;
import
 org.jdom.output.Format;
import
 org.jdom.output.XMLOutputter;

/**
 * 对xml进行修改删除
 * @author qingbyqing
 * @date 2011-3-29
 */

public
 
class
 XmlMendUtil {
    private
 Document doc=
null
;

    //根据需要修改的文件创建文档
    public
 
void
 setRootNode(String fileName){

        SAXBuilder builder = new
 SAXBuilder();
        try
 {
            doc=builder.build(fileName);

        } catch
 (JDOMException e) {
            e.printStackTrace();
        } catch
 (IOException e) {
            e.printStackTrace();
        }

    }
    public
 
void
 mendXml(){

        if
(doc!=
null
){
            Element root = doc.getRootElement();
            root.removeContent(root.getChildren().size()-1
);
//删除最后一个元素

            //删除第一个元素下的id属性
            root.getChild("ajax"
).setAttribute(
"id"
, 
"3"
);
            root.getChild("ajax"
).removeContent();
            //修改第二个元素的内容为：DHTML
            root.getChild("ajax"
).addContent(
"DTML"
);
        }

        return
;
    }
    public
 
void
 outputXML(String fileName){

           XMLOutputter out=new
 XMLOutputter();
           Format format = Format.getPrettyFormat();
           format.setEncoding("UTF-8"
);
           format.setIndent(" "
);

           out.setFormat(format);

           try
 {
            FileWriter fwt = new
 FileWriter(fileName);
            out.output(doc, fwt);
            fwt.flush();
            fwt.close();
        } catch
 (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    /**
     * @param args
     */
    public
 
static
 
void
 main(String[] args) {

        XmlMendUtil mend=new
 XmlMendUtil();
        mend.setRootNode("I:\\xml\\ajaxs.xml"
);

        mend.mendXml();
        mend.outputXML("I:\\xml\\mended.xml"
);
    }
}

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生成如下文件

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将jdom-jar导入到项目中去：
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