java三方---->dom4j解析xml数据

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Dom4j是一个易用的、开源的库，用于XML，XPath和XSLT。它应用于Java平台，采用了Java集合框架并完全支持DOM，SAX和JAXP。今天我们就开始Dom4j的学习。

Dom4j的使用

dom4j的使用项目结构如下：

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" alt="" />

Dom4j的下载地址：https://sourceforge.net/projects/dom4j/?source=typ_redirect

一、请求数据，并且保存到本地文件中

private static String fileName = "file/huhxDom.xml";
private static String requestUrl = "http://wcf.open.cnblogs.com/blog/u/huhx/posts/1/3";// 将url的内容读取到本地文件夹中
public static void writeFileFromUrl(String strUrl) {
HttpURLConnection connection = null;
OutputStream outputStream = null;
InputStream inputStream = null;
try {
URL url = new URL(strUrl);
connection = (HttpURLConnection) url.openConnection();
outputStream = new FileOutputStream(new File(fileName));
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
connection.setRequestMethod("GET"); if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
inputStream = connection.getInputStream();
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, length);
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
outputStream.close();
inputStream.close();
connection.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
}

二、从本地文件中读取数据并解析：

// 解析文件，将内容取出来
public static void readFromFile() {
SAXReader reader = new SAXReader();
try {
Document document = reader.read(new File(fileName));
Element rootElement = document.getRootElement();
// 博客logo的路径
System.out.println("logo: " + rootElement.elementText("logo")); // 网页的标题
System.out.println("title: " + rootElement.elementText("title")); // 发布博客数量
System.out.println("postcount: " + rootElement.elementText("postcount")); // 博客作者信息
Element authorElement = rootElement.element("author");
System.out.println("authorName: " + authorElement.elementText("name"));
System.out.println("authorUri: " + authorElement.elementText("uri"));
System.out.println("-------------------------------------------------------"); // 博客的列表，所有的entry列表
@SuppressWarnings("unchecked")
List<Element> entries = rootElement.elements("entry");
for (Element entry : entries) {
System.out.println("entryId: " + entry.elementText("id"));
System.out.println("entryTitle: " + entry.elementText("title").replaceAll(">", ">"));
System.out.println("entrySummary: " + entry.elementTextTrim("summary"));
System.out.println("entryLink: " + entry.element("link").attributeValue("href"));
System.out.println("***************************************************");
}
} catch (DocumentException e) {
e.printStackTrace();
}
}

三、得到下载的xml文件huhxDom.xml内容如下：

<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title type="text">博客园_huhx</title>
<id>uuid:a0d85c23-4321-4ed6-938b-c6924edf816d;id=18947</id>
<updated>2016-06-07T11:40:07+08:00</updated>
<logo>http://pic.cnblogs.com/face/849920/20160316222225.png</logo>
<author>
<name>huhx</name>
<uri>http://www.cnblogs.com/huhx/</uri>
</author>
<postcount>68</postcount>
<entry>
<id>5564873</id>
<title type="text">js插件----&gt;日期控件My97DataPicker的使用</title>
<summary type="text">My97DatePicker是一个更全面，更人性化，并且速度一流的日期选择控件。具有强大的日期范围限制功能；自定义事件和丰富的API库；多语言支持和自定义皮肤支持；跨无限级框架显示和自动选择显示位置。今天我们就开始My97DatePicker的基础使用。
日期控件My97DataPicker 一、将
</summary>
<published>2016-06-07T11:40:00+08:00</published>
<updated>2016-06-07T11:16:35Z</updated>
<author>
<name>huhx</name>
<uri>http://www.cnblogs.com/huhx/</uri>
</author>
<link rel="alternate"
href="http://www.cnblogs.com/huhx/p/jsThirdMy97DataPicker.html" />
<diggs>0</diggs>
<views>7</views>
<comments>0</comments>
</entry>
<entry>
<id>5563444</id>
<title type="text">js插件----&gt;jquery通知插件toastr的使用</title>
<summary type="text">toastr是一款非常棒的基于jquery库的非阻塞通知提示插件，toastr可设定四种通知模式：成功，出错，警告，提示，而提示窗口的位置，动画效果都可以通过能数来设置。toastr需要jquery的支持。今天我们就开始toastr的学习。
jquery通知插件toastr的使用一、引入jquer
</summary>
<published>2016-06-06T18:50:00+08:00</published>
<updated>2016-06-07T11:16:35Z</updated>
<author>
<name>huhx</name>
<uri>http://www.cnblogs.com/huhx/</uri>
</author>
<link rel="alternate" href="http://www.cnblogs.com/huhx/p/jsThirdToastr.html" />
<diggs>0</diggs>
<views>17</views>
<comments>0</comments>
</entry>
<entry>
<id>5557028</id>
<title type="text">java三方----&gt;html解析jsoup的使用</title>
<summary type="text">jsoup 是一款 Java 的HTML
解析器，可直接解析某个URL地址、HTML文本内容。它提供了一套非常省力的API，可通过DOM，CSS以及类似于JQuery的操作方法来取出和操作数据。今天我们就开始jsoup的学习。
jsoup解析html jsoup的主要功能如下：从一个URL，文件或
</summary>
<published>2016-06-03T17:30:00+08:00</published>
<updated>2016-06-07T11:16:35Z</updated>
<author>
<name>huhx</name>
<uri>http://www.cnblogs.com/huhx/</uri>
</author>
<link rel="alternate" href="http://www.cnblogs.com/huhx/p/javaThirdJsoup.html" />
<diggs>0</diggs>
<views>103</views>
<comments>0</comments>
</entry>
</feed>

四、解析该文件，得到博客的相关信息：

logo: http://pic.cnblogs.com/face/849920/20160316222225.png
title: 博客园_huhx
postcount:
authorName: huhx
authorUri: http://www.cnblogs.com/huhx/
-------------------------------------------------------
entryId:
entryTitle: js插件---->日期控件My97DataPicker的使用
entrySummary: My97DatePicker是一个更全面，更人性化，并且速度一流的日期选择控件。具有强大的日期范围限制功能；自定义事件和丰富的API库；多语言支持和自定义皮肤支持；跨无限级框架显示和自动选择显示位置。今天我们就开始My97DatePicker的基础使用。日期控件My97DataPicker 一、将
entryLink: http://www.cnblogs.com/huhx/p/jsThirdMy97DataPicker.html
***************************************************
entryId:
entryTitle: js插件---->jquery通知插件toastr的使用
entrySummary: toastr是一款非常棒的基于jquery库的非阻塞通知提示插件，toastr可设定四种通知模式：成功，出错，警告，提示，而提示窗口的位置，动画效果都可以通过能数来设置。toastr需要jquery的支持。今天我们就开始toastr的学习。 jquery通知插件toastr的使用一、引入jquer
entryLink: http://www.cnblogs.com/huhx/p/jsThirdToastr.html
***************************************************
entryId:
entryTitle: java三方---->html解析jsoup的使用
entrySummary: jsoup 是一款 Java 的HTML 解析器，可直接解析某个URL地址、HTML文本内容。它提供了一套非常省力的API，可通过DOM，CSS以及类似于JQuery的操作方法来取出和操作数据。今天我们就开始jsoup的学习。 jsoup解析html jsoup的主要功能如下：从一个URL，文件或
entryLink: http://www.cnblogs.com/huhx/p/javaThirdJsoup.html
***************************************************

Dom4jTest.java文件的内容：

package com.huhx.dom4j;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;public class Dom4jTest {
private static String fileName = "file/huhxDom.xml";
private static String requestUrl = "http://wcf.open.cnblogs.com/blog/u/huhx/posts/1/3"; // 将url的内容读取到本地文件夹中
public static void writeFileFromUrl(String strUrl) {
HttpURLConnection connection = null;
OutputStream outputStream = null;
InputStream inputStream = null;
try {
URL url = new URL(strUrl);
connection = (HttpURLConnection) url.openConnection();
outputStream = new FileOutputStream(new File(fileName));
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
connection.setRequestMethod("GET"); if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
inputStream = connection.getInputStream();
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, length);
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
outputStream.close();
inputStream.close();
connection.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
} // 解析文件，将内容取出来
public static void readFromFile() {
SAXReader reader = new SAXReader();
try {
Document document = reader.read(new File(fileName));
Element rootElement = document.getRootElement();
// 博客logo的路径
System.out.println("logo: " + rootElement.elementText("logo")); // 网页的标题
System.out.println("title: " + rootElement.elementText("title")); // 发布博客数量
System.out.println("postcount: " + rootElement.elementText("postcount")); // 博客作者信息
Element authorElement = rootElement.element("author");
System.out.println("authorName: " + authorElement.elementText("name"));
System.out.println("authorUri: " + authorElement.elementText("uri"));
System.out.println("-------------------------------------------------------"); // 博客的列表
@SuppressWarnings("unchecked")
List<Element> entries = rootElement.elements("entry");
for (Element entry : entries) {
System.out.println("entryId: " + entry.elementText("id"));
System.out.println("entryTitle: " + entry.elementText("title").replaceAll(">", ">"));
System.out.println("entrySummary: " + entry.elementTextTrim("summary"));
System.out.println("entryLink: " + entry.element("link").attributeValue("href"));
System.out.println("***************************************************");
}
} catch (DocumentException e) {
e.printStackTrace();
}
} public static void main(String[] args) {
writeFileFromUrl(requestUrl);
readFromFile();
}
}

对Dom4j的一些源码

以下贴出一些Dom4j的重要方法的源码。

一、elementIterator方法

public Iterator elementIterator(String name) {
List list = elements(name);
return list.iterator();
}

二、elementText方法

public String elementText(String name) {
Element element = element(name);
return (element != null) ? element.getText() : null;
}

三、attributeValue方法

public String attributeValue(String name) {
Attribute attrib = attribute(name); if (attrib == null) {
return null;
} else {
return attrib.getValue();
}
}

四、element方法

public Element element(String name) {
List list = contentList();
int size = list.size(); for (int i = 0; i < size; i++) {
Object object = list.get(i); if (object instanceof Element) {
Element element = (Element) object; if (name.equals(element.getName())) {
return element;
}
}
}
return null;
}

五、elementTextTrim方法

public String elementTextTrim(String name) {
Element element = element(name);
return (element != null) ? element.getTextTrim() : null;
}

element.getTextTrim()方法的说明：

return： the trimmed text value where whitespace is trimmed and normalised into single spaces. This method does not return null.

友情链接

博客服务接口：http://wcf.open.cnblogs.com/blog/help
新闻服务接口：http://wcf.open.cnblogs.com/news/help
json数据解析：android基础----JSON数据的解析
其它的xml数据解析：android基础----XMl数据的解析

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