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java中如何读入XML格式的string或硬盘文件？还有怎么判定一个string的内容为XML格式的？
public class Test {
public static void main(String args[]){
boolean b = false;
try {
FileReader read = new FileReader("D:/struts.xml");
BufferedReader br = new BufferedReader(read);
String row;
int i=0;
while((row = br.readLine())!=null){
System.out.println(row);
if(row.substring(0, 5).equals("?xml") || row.substring(row.length()-2, row.length()).equals("?")){
b=true;
}
i++;
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e){
e.printStackTrace();
}
if(b){
System.out.println("这是一个xml文件");
}else
System.out.println("这不是一个xml文件");
}
}
运行结果：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
""
<struts>
<include file="struts-login.xml" />
<include file="struts-okd.xml" />
<include file="struts-smt.xml" />
</struts>
这是一个xml文件
当我把文件换为test.xml时，运行结果：
01211132abcd
这不是一个xml文件
java读取xml文件内容
java中不是有个读取xml文件的类吗？之间调用那类读取出来，然后用取节点的方法去取对应节点的里的值。等下给你代码。
public class ReaderXml {
private static String filename = "E:\\workplace\\readerxml\\bin\\reader\\xml\\reader.xml";
// private static Config config;
public static void main(String []args) throws Exception{
//这里用反射机制
DocumentBuilderFactory domfac=DocumentBuilderFactory.newInstance();
DocumentBuilder dombuilder=domfac.newDocumentBuilder();
//读取文件流
InputStream is=new FileInputStream(filename);
Document doc=dombuilder.parse(is);
Element root=doc.getDocumentElement();
//获取所有xml节点
NodeList dbinfo=root.getChildNodes();
if(dbinfo!=null){
for(int i=0;i<dbinfo.getLength();i++){
//获取节点判断
Node db=dbinfo.item(i);
//如果是Hardwares节点，也就是你xml文件的最顶处的节点
if(db.getNodeName().equals("Hardwares")){
//获取第二个节点包含的所有节点
NodeList list=db.getChildNodes();
for(int y=0;y<list.getLength();y++){
Node n=list.item(y);
//如果节点等于Hardware
if(n.getNodeName().equals("Hardware")){
//获取Hardware节点中的所有节点
NodeList CnodeList=n.getChildNodes();
//取出Hardware里面的所有节点
for(int k=0;k<CnodeList.getLength();k++){
//取出节点
Node cn=CnodeList.item(k);
//去掉里面的#text文件节点。没用，这个不是你配置的节点，应该是xml文件隐藏的
if(!cn.getNodeName().equals("#text")){
//打印你所配置的所有节点
System.out.println("node["+k+"]="+cn.getNodeName()+" nodeValue["+k+"]="+cn.getTextContent());
}
}
}
}
}
}
}
}
}
//具体你要干嘛自己弄了！
在Java中如何读取XML字符串的元素值
java读取xml节点元素，主要使用java提供的解析xml的工具类SAXParserFactory，如下代码：
package xml.xmlreader;
import java.io.File;
import java.net.URL;
import java.util.Properties;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
public class CFGParser {
//解析xml文件的工具类
private Properties props;
public Properties getProps() {
return props;
}
public void setProps(Properties props) {
this.props = props;
}
public void parse(String filename) throws Exception {
CFGHandler handler = new CFGHandler();
SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setNamespaceAware(false);
factory.setValidating(false);
SAXParser parser = factory.newSAXParser();
URL confURL = super.getClass().getClassLoader().getResource(filename);
if (confURL == null) {
System.out.println("Can't find configration file.");
return;
}
try {
parser.parse(confURL.toString(), handler);
this.props = handler.getProps();
} finally {
factory = null;
parser = null;
handler = null;
}
}
public void parseFile(String filename) throws Exception {
CFGHandler handler = new CFGHandler();
SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setNamespaceAware(false);
factory.setValidating(false);
SAXParser parser = factory.newSAXParser();
File f = new File(filename);
if ((f == null) || (!f.exists())) return;
try {
parser.parse(f, handler);
this.props = handler.getProps();
} finally {
factory = null;
parser = null;
handler = null;
}
}
}
package xml.xmlreader;
import java.util.Properties;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class CFGHandler extends DefaultHandler{
private Properties props;
private String currentSet;
private String currentName;
private StringBuffer currentValue = new StringBuffer();
public CFGHandler() {
this.props = new Properties();
}
public Properties getProps() {
return this.props;
}
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
this.currentValue.delete(0, this.currentValue.length());
this.currentName = qName;
}
public void characters(char[] ch, int start, int length) throws SAXException {
this.currentValue.append(ch, start, length);
}
public void endElement(String uri, String localName, String qName) throws SAXException {
this.props.put(qName.toLowerCase(), this.currentValue.toString().trim());
}
}
xml文件
<?xml version="1.0" encoding="UTF-8"?>
<xml-body>
<refresh_userlist desc="用户列表刷新间隔时间(秒)">6</refresh_userlist>
<refresh_message desc="短消息刷新间隔时间(秒)">10</refresh_message>
<morningbegin desc="上午上班时间">23:00</morningbegin>
<morningend desc="上午下班时间">12:00</morningend>
<afternoonbegin desc="下午上班时间">18:00</afternoonbegin>
</xml-body>
jsp获取各个节点的值：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<jsp:useBean id="cfgp" scope="page" class="xml.xmlreader.CFGParser"/>
<jsp:useBean>
<body>
<%
cfgp.parse("kaoqin.xml");
Properties pro = cfgp.getProps();
String stTime = pro.getProperty("morningbegin");
String edTime = pro.getProperty("morningend");
String afternoonbegin = pro.getProperty("afternoonbegin");
out.println(stTime+"\n"+edTime+"\n"+afternoonbegin);
System.out.println(stTime+"\n"+edTime+"\n"+afternoonbegin);
%>
</body>
</html>
