xml操作笔记

1，将xml字符串解析为xml

　　Document doc  = DocumentHelper.parseText(xml); // 将字符串转为XML

2，遍历xml通过指定一个参数获取其他参数的值

xml文件：

<nodes>
	<node key='key0' value='value0' />
	<node key='key1' value='value1' />
	<node key='key2' value='value2' />
	<node key='key3' value='value3' />
	<node key='key4' value='value4' />
</nodes>

 方法：

  import org.dom4j.Document;
		  import org.dom4j.DocumentException;
		  import org.dom4j.DocumentHelper;
		  import org.dom4j.Element;
		  import org.dom4j.io.SAXReader;
		  //----------------　　    

		  public String getXmlvalueByKey(String xmlString, String key) {
		          String value = null;
		          Element placard = null;
		          Document document = null;
		          SAXReader reader = new SAXReader();
		          try {
		              // document = reader.read(new File("E:/temp/test.xml")); //解析xml文件
		              document = DocumentHelper.parseText(xmlString); // 解析xml字符串
		              placard = document.getRootElement();
		              Element item = (Element) placard.selectSingleNode("/nodes/node[@key='" + key + "']");
		              if (item != null) {
		                  value = item.attributeValue("value");
		              }
		          } catch (DocumentException e) {
		              e.printStackTrace();
		          }
		          return value;
		      }

 测试方法：

@Test
		public void test1() throws Exception{
		String xmlString ="<nodes><node key='key0' value='value0' /><node key='key1' value='value1' /><node key='key2' value='value2' /><node key='key3' value='value3' /><node key='key4' value='value4' /></nodes>";
		
		//查找xml文件key的值
		  String value=new ExcelOperationUtil().getXmlvalueByKey(xmlString,"key1");
		  System.out.println(value);//输出结果value1
		}