AXIOM 读写 xml文件

什么是AXIOM?

Axiom,也就是Axis Object Model
Axis2用Axiom处理soap文档和soap信息。

Axiom的一些特性：

Lightweight（轻量），更少的内存需要。
Deferred building（延迟构建）
Pull based（pull模式），OM基于StAX－－标准的pull parser API。

pull模式

Axiom采用pull解析方式，基于StAX（JSR173）。
SAX和DOM 都是基于push的解析方式，也就是说解析控制在parser本身。
Axiom和StAX紧密相关，要使用Axiom，StAX相关的jar包也必须在classpath下。

Axiom读XML：

1.需要的包

axiom-api-1.2.8.jar

包含javax.xml.*的包
JDK中就有javax.xml.*的包,但一定不要使用他们,所以一定要把AXIS2下的此包加入buildPath,如果不加入,系统也不报错,因为会从JDK中找到,但这样使用JDK的包就会在运行的时候出异常

2.范例test1.xml 文件(用于下面的读写)

<?xml version="1.0" encoding="UTF-8"?>
<fool>
<student>
<name>mac</name>
<id>12</id>
<age>33</age>
<sex>male</sex>
</student>
<student>
<name>silly</name>
<id>5</id>
<age>12</age>
<sex>female</sex>
</student>
<teacher>
<name>Mr. Jones</name>
<id>2</id>
<age>31</age>
<sex>male</sex>
</teacher>
<student>
<name>macy</name>
<id>2</id>
<age>40</age>
<sex>female</sex>
</student>
<student>
<name>tom</name>
<id>32</id>
<age>31</age>
<sex>male</sex>
</student>
<message>hello world</message>
</fool>

3.简单读-----直接匹配name去读

// 首先对具体的xml文件构建parser
FileInputStream xmlFile = new FileInputStream("test1.xml");
XMLStreamReader parser = XMLInputFactory.newInstance().createXMLStreamReader(xmlFile);

// 还需要StAXOMBuilder对象
StAXOMBuilder builder = new StAXOMBuilder(parser);

OMElement doc = builder.getDocumentElement(); // 读到<fool></fool>

OMElement cre = doc.getFirstChildWithName(new QName("student")); //读到<student>

OMElement cre1 = cre.getFirstChildWithName(new QName("id")); // 读到<id></id>
System.out.println(cre1.getLocalName()+":"+cre1.getText());
cre1 = cre.getFirstChildWithName(new QName("name")); // 读到<name></name>
System.out.println(cre1.getLocalName()+":"+cre1.getText());

cre1 = cre.getFirstChildWithName(new QName("age")); // 读到<age></age>
System.out.println(cre1.getLocalName()+":"+cre1.getText());

cre1 = cre.getFirstChildWithName(new QName("sex")); // 读到<sex></sex>
System.out.println(cre1.getLocalName()+":"+cre1.getText());

结果:
id:12
name:mac
age:33
sex:male

4.复杂读-----getChild

FileInputStream xmlFile = new FileInputStream("test1.xml");
XMLStreamReader parser = XMLInputFactory.newInstance().createXMLStreamReader(xmlFile);

StAXOMBuilder builder = new StAXOMBuilder(parser);

OMElement doc = builder.getDocumentElement();

Iterator<OMElement> iter = doc.getChildElements();
while(iter.hasNext()){
OMElement temp = iter.next();
System.out.println("====================");
System.out.println(temp.getLocalName());
System.out.println(temp.getText());

if(temp.getLocalName().equals("student")){
Iterator<OMElement> iter1 = temp.getChildElements();
System.out.println("----------------");
while(iter1.hasNext()){
OMElement temp1 = iter1.next();
System.out.println(temp1.getLocalName()+":"+temp1.getText());
}
}
}

结果:
====================
student

----------------
name:mac
id:12
age:33
sex:male
====================
student

----------------
name:silly
id:5
age:12
sex:female
====================
teacher

====================
student

----------------
name:macy
id:2
age:40
sex:female
====================
student

----------------
name:tom
id:32
age:31
sex:male
====================
message
hello world

Axiom写XML：

简单方式(基本方式,无ns,无attribute)

1.建立节点
// 通常通过OMFactory来构造XML文档中的element
OMFactory factory = OMAbstractFactory.getOMFactory();

//建立doc节点,doc节点会和下面的root节点合并
OMDocument doc = factory.createOMDocument();

//建立root节点
OMElement root = factory.createOMElement(new QName("root"));

//建立两个普通节点
OMElement stu = factory.createOMElement(new QName("student"));
stu.addChild(factory.createOMText("mac"));

OMElement tea = factory.createOMElement(new QName("teacher"));
tea.addChild(factory.createOMText("silly"));

2.构建树
//构建树,将两个普通节点连到root节点上
root.addChild(stu);
root.addChild(tea);
//构建树,将root节点连到doc节点上
doc.addChild(root);

3. 写入文件
// 构建writer做输出器
XMLStreamWriter writer = XMLOutputFactory.newInstance().createXMLStreamWriter(
new FileOutputStream("2.xml"));
root.serialize(writer); // cache on
writer.flush();

4. 看结果
"2.xml"
<root><student>mac</student><teacher>silly</teacher></root>

此文件缺陷:
1.没有xml页首的<?xml version="1.0" encoding="UTF-8"?>
2.没有回车换行

5.试着用AXIOM读
FileInputStream xmlFile = new FileInputStream("2.xml");
XMLStreamReader parser = XMLInputFactory.newInstance().createXMLStreamReader(xmlFile);

StAXOMBuilder builder = new StAXOMBuilder(parser);
OMElement doc = builder.getDocumentElement();

Iterator<OMElement> iter = doc.getChildElements();
while(iter.hasNext()){
OMElement temp = iter.next();
System.out.println("====================");
System.out.println(temp.getLocalName()+":"+temp.getText());
}

结果:
====================
student:mac
====================
teacher:silly

Axiom写XML,复杂方式

1. 构建节点
// 通常通过OMFactory来构造XML文档中的element
OMFactory factory = OMAbstractFactory.getOMFactory();

// 建立 namespace
OMNamespace ns = factory.createOMNamespace("http://demo.axiom","x");
OMNamespace ns1 = factory.createOMNamespace("http://ot.demo.axiom","y");

//建立doc节点,doc节点会和下面的root节点合并
OMDocument doc = factory.createOMDocument();

//建立root节点
OMElement root = factory.createOMElement("root",ns);

//建立两个普通节点
OMElement stu = factory.createOMElement("student",ns1);
stu.addChild(factory.createOMText("mac"));

OMElement tea = factory.createOMElement("teacher","http://namespace","ns");
tea.addChild(factory.createOMText("silly"));

2.构建树
//构建树,将两个普通节点连到root节点上
root.addAttribute(factory.createOMAttribute("attr",ns,"hello world"));
root.addChild(stu);
root.addChild(tea);
//构建树,将root节点连到doc节点上
doc.addChild(root);

3. 输出到文件或打印到屏幕
// 构建writer做输出器
XMLStreamWriter writer = XMLOutputFactory.newInstance().createXMLStreamWriter(
new FileOutputStream("2.xml"));
root.serialize(writer); // cache on
writer.flush();

4.
生成xml如下:
<x:root xmlns:x="http://demo.axiom" x:attr="hello world"><y:student xmlns:y="http://ot.demo.axiom">mac</y:student><ns:teacher xmlns:ns="http://namespace">silly</ns:teacher></x:root>

5.试着用AXIOM读 FileInputStream xmlFile = new FileInputStream("2.xml"); XMLStreamReader parser = XMLInputFactory.newInstance().createXMLStreamReader(xmlFile); StAXOMBuilder builder = new StAXOMBuilder(parser); OMElement doc = builder.getDocumentElement(); Iterator<OMElement> iter = doc.getChildElements(); while(iter.hasNext()){ OMElement temp = iter.next(); System.out.println("===================="); System.out.println(temp.getLocalName()+":"+temp.getText()); } 结果: ==================== student:mac ==================== teacher:silly

原文链接：https://www.f2er.com/xml/295623.html

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