xml和String的转换

Author: enjoyCoding666

src/main/java/com/XmlUtils.java

@@ -1,52 +1,96 @@
 package com;
 
-import org.dom4j.Attribute;
-import org.dom4j.Document;
-import org.dom4j.Element;
+import org.dom4j.*;
+import org.dom4j.io.OutputFormat;
 import org.dom4j.io.SAXReader;
+import org.dom4j.io.XMLWriter;
 
-import java.io.File;
+import java.io.*;
 
 /**
  * Created by lenovo on  二月
  */
 public class XmlUtils {
-         public void getXmlContent() throws  Exception {
-             SAXReader saxReader=new SAXReader();
-             //获取文件，转换成Document对象
-             Document document=saxReader.read( new File("E:\\test.xml"));
-             //获取根元素
-             Element root=document.getRootElement();
-             //文档转换为字符串
-             String docXmlText=document.asXML();
-             System.out.println("xml内容如下：");
-             System.out.println(docXmlText);
-             System.out.println("根目录标签的内容如下：");
-             String rootXmlText=root.asXML();
-             System.out.println(rootXmlText);
-             System.out.println("子标签<西游记>的内容如下：");
-             Element e1=root.element("西游记");
-             System.out.println(e1.asXML());
-             System.out.println("子标签<作者>的内容如下：");
-             Element e2=e1.element("作者");
-             System.out.println(e2.asXML());
-             System.out.println("标签内容如下:");
-             String text=e2.getText();
-//             String text= e2.asXML().substring(e2.asXML().indexOf(">") + 1, e2.asXML().lastIndexOf("<"));
-             System.out.println(text);
-         }
+    /**
+     * 获取xml文件的内容
+     * @param fileName 文件名，类似  String fileName1="E:\\test.xml";
+     * @param names   标签组成的字符数组.比如 String[] names=new String[]{"西游记","作者"};
+     * @throws Exception
+     */
+    public void getXmlContent(String fileName,String[] names) throws  Exception {
+        SAXReader saxReader=new SAXReader();
+        //获取文件，转换成Document对象
+        Document document=saxReader.read( new File(fileName));
+        //获取xml内容
+        String docXmlText=document.asXML();
+        System.out.println("xml内容如下："+docXmlText);
+        System.out.println("-----------------------------");
+        //获取根元素
+        Element e=document.getRootElement();
+        //遍历xml文档
+        for(String name : names) {
+                if (  e!=null &&  e.element(name)!=null) {
+                    e=e.element(name);
+                    String elementStr=e.asXML();
+                    System.out.println(elementStr);
+                    System.out.println("-----------------------------");
+          }
+        }
+         String text=e.getText();
+         System.out.println("元素内容如下:\n"+text);
+    }
 
 
-         public void getElementText() throws  Exception{
-             SAXReader saxReader=new SAXReader();
-             //获取文件，转换成Document对象
-             Document document=saxReader.read( new File("E:\\test.xml"));
-             Element root=document.getRootElement();
-             Attribute attribute=root.attribute("四大名著");
-             String text=attribute.getText();
-             System.out.println(text);
+    /**
+     * 字符串写入xml文件
+     * @param text   文本内容，类似 String text="<csdn><java>Java班</java><net>Net班</net></csdn>";
+     * @throws Exception
+     */
+         public void stringToXml(String text,String fileName) throws Exception {
+              Document document= DocumentHelper.parseText(text);
+              Element element=document.getRootElement();
+              System.out.println(element.getName());
+              writeToXml(document,fileName);
+         }
 
+    /**
+     * 把document对象写入xml文件中
+     * @param document
+     */
+    public void writeToXml(Document document,String fileName) throws Exception {
+//        紧凑的格式
+//        OutputFormat format=OutputFormat.createCompactFormat();
+//         排版缩进的格式
+          OutputFormat format=OutputFormat.createPrettyPrint();
+          format.setEncoding("UTF-8");
+          //创建XmlWriter对象，指定文件及编码
+          XMLWriter xmlWriter=new XMLWriter(new OutputStreamWriter(new FileOutputStream(new File(fileName)),"UTF-8"),format);
+          xmlWriter.write(document);
+          //刷新流
+          xmlWriter.flush();
+          xmlWriter.close();
+    }
 
+    public void createDocumentToXml(String fileName) throws  Exception{
+        Document document=DocumentHelper.createDocument();
+        Element root=document.addElement("csdn");
+        Element java=root.addElement("java");
+        java.setText("java班");
+        Element ios=root.addElement("ios");
+        ios.setText("ios班");
+        writeToXml(document,fileName);
+    }
 
-         }
+//         public void getElementText() throws  Exception{
+//             SAXReader saxReader=new SAXReader();
+//             //获取文件，转换成Document对象
+//             Document document=saxReader.read( new File("E:\\test.xml"));
+//             Element root=document.getRootElement();
+//             Attribute attribute=root.attribute("四大名著");
+//             String text=attribute.getText();
+//             System.out.println(text);
+//
+//
+//
+//         }
 }