jaxp解析xml

1使用jaxp实现查询操作

*查询xml中所有的name的值

1. 创建解析器工厂
2. 根据解析器工厂创建解析器
3. 解析xml返回document
4. 得到所有name元素
5. 遍历集合

 

Public static void main(String args[]) throws Exception{

DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

DocumentBuilder builder = builderFactory.newDocumentBuilder();

Document document = builder.parse(“src/person.xml”);

NodeList list = document.getElementsByTagName(“name”);

for(int i = 0;i<list.getLength();i++){

Node name1 = list.item(i);

String s = name1.getTextContent();

System.out.println(s);

}

}

 

1. 查询得到xml中第一个name元素
2. 创建解析器工厂
3. 根据解析器工厂创建解析器
4. 解析xml得到document
5. 得到所有name元素
6. 使用返回的集合，里面的item下标获取具体元素
7. 得到具体的集，getTextConteng（）

 

Public static void main(String args[]){

DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

DocumentBuilder builder = builderFactory.newDocumentBuilder();

Document document = builder.parse(“src/person.xml”);

NodeList list = document.getElementsByTagName(“name”);

Nade name1 = list.item(0);

String s = name1.getTextContent();

System.out.println(s);

}

 

1. 使用jaxp添加节点

*在第一个p1下面添加<sex>nv</sex>

1. 创建解析器工厂
2. 根据解析器工厂创建解析器
3. 解析xml得到document
4. 得到所有p1元素，得到p1
5. 创建sex标签 createElement
6. 创建文本 createTextNode
7. 将文本加到sex下面  appendchild
8. 将sex加到第一个p1底下
9. 回写xml

 

Public static void main(String args[]){

DcomentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

DocumentBuilder builder = builderFactory.newDocumentBuilder();

Document document = builder.parse(“src/person.xml”);

Node p1 = document.getElementsByTagName(“p1”).item(0);

Element sex1 = createElement(“sex”);

Text text1 = createTextNode(“nv”);

Sex1.appendChild(text1);

p1.appendChild(sex1);

TransformerFactory transformerFactory = TransformerFactory.newInstance();

Transformer transformer = transformerFactory.newTransformer();

Transformer.transformer(new DOMSource,new StreamResult(“src/person.xml”);

}

 

1. 使用jaxp修改节点

*将sex下的值改为nan

1. 创建解析器工厂
2. 使用解析器工厂创建解析器
3. 解析xml得到document
4. 得到<sex>元素
5. 修改sex里面的值setTextContent
6. 回写xml

 

Public static void main(string srg[]){

DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

DcoumentBuileder builder = builderFactory.newDocumentBuilder();

Document document = builder.parse(“src/person.xml”);

Node sex1 = document.getElementsByTagName(“sex”).item(0);

Sex1.setTextContent(“nan”);

TransformerFactory transformerFactory = TransformerFactory.newInstance();

Transformer transformer = transformerFactory.newTransformer();

Transformer.transformer(new DOMSource,new StreamResult(“src/person.xml”);

}