Question

怎么通过java代码向xml文件中添加注释

Answer 1

package com.tuobao.test;

import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class testDom4j {

private static final String path = "f:" + java.io.File.separator
+ "eee.xml";

/**
* @param args
*/
public static void main(String[] args) {
// System.out.println(createXMLFile(path));
// System.out.println(modiXMLFile(path, path));
System.out.println(formatXMLFile(path));
}

/**
* 建立一个XML文档,文档名由输入属性决定
*
* @param param
* filename 需建立的文件名
* @return返回操作结果, 0表失败, 1表成功
*/
public static int createXMLFile(String filename) {
/** 返回操作结果, 0表失败, 1表成功 */
int returnValue = 0;
/** 建立document对象 */
Document document = DocumentHelper.createDocument();
/** 建立XML文档的根books */
Element booksElement = document.addElement("books");
/** 加入一行注释 */
booksElement.addComment("This is a test for dom4j, holen, 2004.9.11");
/** 加入第一个book节点 */
Element bookElement = booksElement.addElement("book");
/** 加入show属性内容 */
bookElement.addAttribute("show", "yes");
/** 加入title节点 */
Element titleElement = bookElement.addElement("title");
/** 为title设置内容 */
titleElement.setText("Dom4j Tutorials");

/** 类似的完成后两个book */
bookElement = booksElement.addElement("book");
bookElement.addAttribute("show", "yes");
titleElement = bookElement.addElement("title");
titleElement.setText("Lucene Studing");
bookElement = booksElement.addElement("book");
bookElement.addAttribute("show", "no");
titleElement = bookElement.addElement("title");
titleElement.setText("Lucene in Action");

/** 加入owner节点 */
Element ownerElement = booksElement.addElement("owner");
ownerElement.setText("O'Reilly");

try {
/** 将document中的内容写入文件中 */
XMLWriter writer = new XMLWriter(new FileWriter(new java.io.File(
filename)));
writer.write(document);
writer.flush();
writer.close();
/** 执行成功,需返回1 */
returnValue = 1;
} catch (Exception ex) {
returnValue = 0;
ex.printStackTrace();
}
return returnValue;
}

/**
* 修改XML文件中内容,并另存为一个新文件 重点掌握dom4j中如何添加节点,修改节点,删除节点
*
* @param filename
* 修改对象文件
* @param newfilename
* 修改后另存为该文件
* @return 返回操作结果, 0表失败, 1表成功
*/
public static int modiXMLFile(String filename, String newfilename) {
int returnValue = 0;
try {
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(new java.io.File(filename));
/** 修改内容之一: 如果book节点中show属性的内容为yes,则修改成no */
/** 先用xpath查找对象 */
List list = document.selectNodes("/books/book/@show");
Iterator iter = list.iterator();
while (iter.hasNext()) {
Attribute attribute = (Attribute) iter.next();
if (attribute.getValue().equals("yes")) {
attribute.setValue("no");
}
}

/**
* 修改内容之二: 把owner项内容改为"测试修改"
* 并在owner节点中加入date节点,date节点的内容为2004-09-11,还为date节点添加一个属性type
*/
list = document.selectNodes("/books/owner");
iter = list.iterator();
if (iter.hasNext()) {
Element ownerElement = (Element) iter.next();
ownerElement.setText("测试修改");
Element dateElement = ownerElement.addElement("date");
dateElement.setText("2008-09-11");
dateElement.addAttribute("type", "日期");
}

/** 修改内容之三: 若title内容为Dom4j Tutorials,则删除该节点 */
list = document.selectNodes("/books/book");
iter = list.iterator();
while (iter.hasNext()) {
Element bookElement = (Element) iter.next();
Iterator iterator = bookElement.elementIterator("title");
while (iterator.hasNext()) {
Element titleElement = (Element) iterator.next();
if (titleElement.getText().equals("Dom4j Tutorials")) {
bookElement.remove(titleElement);
}
}
}

try {
/** 格式化输出,类型IE浏览一样 */
OutputFormat format = OutputFormat.createPrettyPrint();
/** 指定XML编码 */
// format.setEncoding("GBK");
/** 将document中的内容写入文件中 */
// XMLWriter writer = new XMLWriter(new FileWriter(new
// File(newfilename)),format);
// 保证编码为UTF-8，支持中文写入
XMLWriter writer = new XMLWriter(new FileOutputStream(new File(
newfilename)), format);
writer.write(document);
writer.flush();
writer.close();
/** 执行成功,需返回1 */
returnValue = 1;
} catch (Exception ex) {
returnValue = 0;
ex.printStackTrace();
}

} catch (Exception ex) {
ex.printStackTrace();
}
return returnValue;
}

/**
* 格式化XML文档,并解决中文问题
*
* @param filename
* @return
*/
public static int formatXMLFile(String filename) {
int returnValue = 0;
try {
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(new File(filename));
XMLWriter writer = null;
/** 格式化输出,类型IE浏览一样 */
OutputFormat format = OutputFormat.createPrettyPrint();
/** 指定XML编码 */
format.setEncoding("utf-8");
writer = new XMLWriter(new FileWriter(new File(filename)), format);
writer.write(document);
writer.flush();
writer.close();
/** 执行成功,需返回1 */
returnValue = 1;
} catch (Exception ex) {
returnValue = 0;
ex.printStackTrace();
}
return returnValue;
}
}
这个希望对你有用。。

Answer 2

看一下dom4j的api吧里面肯定有加注释的方法