dom4j解析、修改、生成xml文件

項目中用到XML的地方非常普遍，XML也不是一種新的技術。但經常遇到朋友們問如何操作XML文件。所以寫一個小例子，代碼很亂。寫出來和大家一起交流學習 

1、生成XML 

public void createApplicationConfigXML(){
         //建立document對象
         try {
                 Document document = DocumentHelper.createDocument();
                 Element root = document.addElement("root");//添加文檔根
                 root.addComment("這個一個註釋");//加入一行註釋
                 Element request = root.addElement("request"); //添加root的子節點
                 request.addAttribute("type", "cat");
                 request.addAttribute("flow", "tong");
                 request.addAttribute("time", "2009");
                 Element pro = request.addElement("pro");
                 pro.addAttribute("type", "att");
                 pro.addAttribute("name", "附件");
                 pro.addText("測試哈子");

                 Element cd = request.addElement("pro");
                 cd.addAttribute("type", "cd");
                 cd.addAttribute("name", "特殊字符過濾");
                 cd.addCDATA("特殊字符");

                 //輸出全部原始數據，在編譯器中顯示
                 OutputFormat format = OutputFormat.createPrettyPrint();
                 format.setEncoding("GBK");//根據需要設置編碼
                 XMLWriter writer = new XMLWriter(System.out, format);
                 document.normalize();
                 writer.write(document);
                 writer.close();
                 // 輸出全部原始數據，並用它生成新的我們需要的XML文件
                 XMLWriter writer2 = new XMLWriter(new FileWriter(new File(
                 "test.xml")), format);
                 writer2.write(document); //輸出到文件
                 writer2.close();
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

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下面是解析和修改XML 
XML文件內容如下： 

<?xml version="1.0" encoding="utf-8"?>
<root>
    <request type="Pending" flowType="GENERAL" flowName="報銷流程"
        docId="185647" flowId="16409" nodeName="報銷人確認" wikId="58288"
        sendId="1210040" userId="1210040" createDate="2009-12-03"
        title="費用報銷 " flowCreaterId="1210040" nodeType="1"
        bosTime="2009-12-03 09:36:15">
        <pro type="att"></pro>
        <pro type="textarea" name="OP_bxryj" title="處理意見" need="true"></pro>
    </request>
</root>

修改 

public String getApplcationConfigFromXMLTest(){
    String value = "";
    try {
        SAXReader sax = new SAXReader();
        Document xmlDoc = sax.read(new File(this.UBSSDIC_PATH));
        Element root = xmlDoc.getRootElement();//根節點
        Iterator it = root.elementIterator();
        while(it.hasNext()){
            Element ele = (Element)it.next();
            Attribute attribute = ele.attribute("type");
            if(attribute.getStringValue().equals("Pending")){
                attribute.setValue("sendread2");//修改屬性節點的值
            }

            Attribute flowType = ele.attribute("flowType");
            flowType.detach();//刪除某個屬性

            ele.addAttribute("type", "Pending");//添加一個屬性節點
        }
        Element new_cdata = root.addElement("new_cdata");//添加一個元素
        new_cdata.addCDATA("tst&ree");

        Element new_ele = root.addElement("new_ele");//添加一個元素
        new_ele.addText("33434343");

        Element obj = (Element)root.selectObject("//pro[@type='att']");//根據XPath查找元素
        obj.setText("測試dddddd");//修改元素的值 即text節點
             //輸出全部原始數據，在編譯器中顯示
           OutputFormat format = OutputFormat.createPrettyPrint();
           format.setEncoding("GBK");
           XMLWriter writer = new XMLWriter(System.out, format);
           writer.write(xmlDoc);
           writer.close();
           // 輸出全部原始數據，並用它生成新的我們需要的XML文件
           XMLWriter writer2 = new XMLWriter(new FileWriter(new File(
             "test.xml")), format);
           writer2.write(xmlDoc); //輸出到文件
           writer2.close();
    } catch (DocumentException e) {
        System.out.println(e.getMessage());
        e.printStackTrace();
    }catch(IOException e){
        e.printStackTrace();
    }
    return value ;
}

解析 

public void parseApplicationConfigXML(){
    try {
        SAXReader sax = new SAXReader();
        Document xmlDoc = sax.read(new File("E:\\20090316HPS\\Dom4jTest\\t.xml"));
        Element root = xmlDoc.getRootElement();//根節點
        Iterator it = root.elementIterator("request");
        while(it.hasNext()){
            Element request = (Element)it.next();
            System.out.println(request.getName());
            System.out.println(request.attributeValue("type"));
            System.out.println(request.attributeValue("flow"));
            System.out.println(request.attributeValue("time"));

        }
        System.out.println("-------------------------------------------");
        List list = root.selectNodes("//pro");
        for(int i = 0; i < list.size(); i++){
            Element pro = (Element)list.get(i);
            System.out.println(pro.getName());
            System.out.println(pro.attributeValue("type"));
            System.out.println(pro.attributeValue("name"));
            System.out.println(pro.getText());
            System.out.println("+++++++++++++++++++++++++++++++++");
        }
    } catch (DocumentException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}