XSL解析xml

1.解析步骤

(1)取得xml文件的内容xmlContent(通过IO流或者由webservice得到应答字符串)

(2)根据xmlContent构造输入流xmlStream

InputStream xmlStream = new ByteArrayInputStream(xmlContent.getBytes("UTF-8")；

(3)根据xsl文件的路径构造输入流xsltStream

InputStream xsltStream = new FileInputStream(xslFilePath);

(4)由xsltStream构造Source 对象xsltSource

Source xsltSource = new StreamSource(xsltStream);

(5)取得TransformerFactory的实例factory

TransformerFactory factory = TransformerFactory.newInstance();

(6)根据xsltSource，从factory 中构造Transformer 对象trans

Transformer trans = factory.newTransformer(xsltSource);

(7)给xsl文件中传递参数(不是必须的)

trans.setParameter("参数名", 参数值);

trans.setOutputProperty(OutputKeys.ENCODING, "gbk");//加入这句可防止中文乱码

(8)开始xsl解析

result = new StreamResult(new ByteArrayOutputStream());

trans.transform(new StreamSource(xmlStream), result);

(9)得到xsl解析之后的字符串

result.getOutputStream().toString()

2.具体实例

(1)books.xml

<?xml version="1.0" encoding="utf-8"?>
<books password="123">
	<book kinds="A">
	    <id>1</id>
		<name>A</name>
		<number>10</number>
		<price>1520</price>
		<printdate>20100506</printdate>
		<seconds>259200</seconds>
	</book>
	<book kinds="A">
        <id>2</id>
		<name>B</name>
		<number>20</number>
		<price>3550</price>
		<printdate>20100801</printdate>
		<seconds>86400</seconds>
	</book>
	<book kinds="A">
	    <id>3</id>
		<name>C</name>
		<number>30</number>
		<price>3200</price>
		<printdate>20100802</printdate>
		<seconds>43200</seconds>
	</book>
	<book kinds="A">
	    <id>4</id>
		<name>D</name>
		<number>40</number>
		<price>6580</price>
		<printdate>20100806</printdate>
		<seconds>129600</seconds>
	</book>
	<book kinds="unknown">
	<id>4</id>
		<name>D</name>
		<number>40</number>
		<price>6580</price>
		<printdate>20100806</printdate>
		<seconds>129600</seconds>
	</book>
</books>

(2)books.xsl

<xsl:stylesheet version="1.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
	<xsl:output omit-xml-declaration="yes" encoding="UTF-8"
		method="html" />
	<!-- 小数位数为2(分转换成元) -->
	<xsl:param name="DecimalLen">
		2
	</xsl:param>
	<xsl:param name="pwd" />
	<!-- 小数点 -->
	<xsl:param name="PointSplit">
		<xsl:value-of select="'.'" />
	</xsl:param>
	<!-- 日期格式 dd.MM.yyyy -->
	<xsl:param name="DateSplit">
		<xsl:value-of select="'.'" />
	</xsl:param>
	<!-- 解析开始入口 -->
	<xsl:template match="books">
		<!--解析凭证  xml文件中的password必须等于程序中传过来的参数 -->
		<xsl:if test="@password = $pwd">
			<table>
				<thead>
					<tr>
						<th align="middle">
							编号
      			</th>
						<th align="middle">
							名称    				
      			</th>
						<th align="middle">
							数量
      			</th>
						<th align="middle">
							价格(元)
      			</th>
						<th align="middle">
							出版时间
      			</th>
					</tr>
				</thead>
				<tbody>
					<xsl:for-each select="./book">
						<xsl:if test="@kinds='A'">
							<tr>
								<td>
									<xsl:value-of select="./id" />
								</td>
								<td>
									<xsl:value-of select="./name" />
								</td>
								<td>
									<xsl:value-of select="./number" />
								</td>
								<td>
									<!-- 将分转化成元输出 -->
									<xsl:call-template name="changeToYuan">
										<xsl:with-param name="SrcNum" select="./price" />
										<xsl:with-param name="LenNum" select="string-length(./price)" />
									</xsl:call-template>
								</td>
								<td>
									<!-- 日期装化成"yyyy-MM-dd" -->
									<xsl:call-template name="changeToDate">
										<xsl:with-param name="date" select="./printdate" />
									</xsl:call-template>
								</td>
							</tr>
						</xsl:if>
					</xsl:for-each>
				</tbody>
			</table>
		</xsl:if>
	</xsl:template>
	<!-- xml文件中的对应的金额都是分，需要转换元(除以100) -->
	<xsl:template name="changeToYuan">
		<xsl:param name="SrcNum" />
		<xsl:param name="LenNum" />
		<xsl:choose>
			<xsl:when test="$LenNum=1">
				<xsl:value-of select="'0.0'" />
				<xsl:value-of select="$SrcNum" />
			</xsl:when>
			<xsl:when test="$LenNum=2">
				<xsl:value-of select="'0.'" />
				<xsl:value-of select="$SrcNum" />
			</xsl:when>
			<xsl:when test="$LenNum > 2">
				<xsl:value-of select="substring($SrcNum, 1, ($LenNum - $DecimalLen))" />
				<xsl:value-of select="$PointSplit" />
				<xsl:value-of
					select="substring($SrcNum, ($LenNum - $DecimalLen + 1), $DecimalLen)" />
			</xsl:when>
		</xsl:choose>
	</xsl:template>
	
	
	<!--日期装化成"yyyy-MM-dd"-->
	<xsl:template name="changeToDate">
		<xsl:param name="date" />
		<xsl:value-of select="substring($date,1,4)" />
		-
		<xsl:value-of select="substring($date,5,2)" />
		-
		<xsl:value-of select="substring($date,7,2)" />
	</xsl:template>
</xsl:stylesheet>

(3)XSLPractice.java

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
public class XSLPractice {
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.println(getHtmlString("src/books.xml","src/books.xsl","123"));
	}
	 private static String getHtmlString(String xmlFilePath,String xslFilePath,String password){		
			StreamResult result = null;	
			String xmlContent="";
			try {
				//通过流读取xml文件的内容
				InputStreamReader fs= new InputStreamReader(new FileInputStream(new File(xmlFilePath)),"utf-8");
				int i=0;
				int b=0;
				while((b=fs.read())!=-1){
					xmlContent+=String.valueOf((char)b);
				}
				InputStream xmlStream = new ByteArrayInputStream(xmlContent.getBytes("UTF-8"));
				InputStream xsltStream = new FileInputStream(xslFilePath);				
				Source xsltSource = new StreamSource(xsltStream);			
				TransformerFactory factory = TransformerFactory.newInstance();		
				Transformer trans = factory.newTransformer(xsltSource);
				//给xsl文件中传递参数
				trans.setParameter("pwd", password);		
				result = new StreamResult(new ByteArrayOutputStream());
				trans.transform(new StreamSource(xmlStream), result);
			}catch (FileNotFoundException e){
				e.printStackTrace();
			}catch (TransformerConfigurationException e){
				e.printStackTrace();
			}catch (TransformerException e) {
				e.printStackTrace();
			}catch (Exception e){
				e.printStackTrace();
			}		
			if (result == null || result.getOutputStream() == null){
				return "";
			}
			//返回xsl解析之后的字符串
			return result.getOutputStream().toString();
		}
}

(4)将解析之后的字符串显示到jsp页面上：

编号 名称 数量 价格(元) 出版时间

1	A	10	15.20	2010-05-06
2	B	20	35.50	2010-08-01
3	C	30	32.00	2010-08-02
4	D	40	65.80	2010-08-06