//exampleA.xml<?xml version="1.0" encoding="GBK"?><bookList> <book> <name>Java编程入门</name> <author>张三</author> <publishDate>2002-6-6</publishDate> <price>35.0</price> </book> <book> <name>XML在Java中的应用</name> <author>李四</author> <publishDate>2002-9-16</publishDate> <price>92.0</price> </book></bookList>//testJDOM.javaimport org.jdom.*;import org.jdom.output.*;import org.jdom.input.*;import java.io.*;public class TestJDOM{ public static void main(String args[])throws Exception{ SAXBuilder sb = new SAXBuilder(); //从文件构造一个Document,因为XML文件中已经指定了编码,所以这里不必了 Document doc = sb.build(new FileInputStream("exampleA.xml")); //加入一条处理指令 ProcessingInstruction pi = new ProcessingInstruction ("xml-stylesheet","href=\"bookList.html.xsl\" type=\"text/xsl\""); doc.addContent(pi); Element root = doc.getRootElement(); //得到根元素 java.util.List books = root.getChildren(); //得到根元素所有子元素的集合 Element book = (Element)books.get(0); //得到第一个book元素 //为第一本书添加一条属性 Attribute a = new Attribute("hot","true"); book.setAttribute(a); Element author = book.getChild("author"); //得到指定的字元素 author.setText("王五"); //将作者改为王五 //或 Text t = new Text("王五");book.addContent(t); Element price = book.getChild("price"); //得到指定的字元素 //修改价格,比较郁闷的是我们必须自己转换数据类型,而这正是JAXB的优势 author.setText(Float.toString(50.0f)); String indent = " "; boolean newLines = true; XMLOutputter outp = new XMLOutputter(indent,newLines,"GBK"); outp.output(doc, new FileOutputStream("exampleB.xml")); }};
Properties defaultProps = new Properties();
FileInputStream in = new FileInputStream("defaultProperties");
defaultProps.load(in);
in.close();// create program properties with default
Properties applicationProps = new Properties(defaultProps);// now load properties from last invocation
in = new FileInputStream("appProperties");
applicationProps.load(in);
in.close();
String ss=null;
FileReader fr=new FileReader();
ss=FileReader.toString();引用的类是import import java.text.*; and import java.io.*;上面的运行老是出错,请各位多多指正,谢谢!
import java.util.*;public class ReadFile {
public static void main(String args[]) {
if (args.length == 0) {
System.err.println("Please provide filename to process");
System.exit(-1);
}
String filename = args[0];
File file = null;
FileReader fr = null;
BufferedReader br = null;
try {
file = new File(filename);
if (file.exists() && file.isFile()) { fr = new FileReader(file);
br = new BufferedReader(fr);
String line;
while ((line = br.readLine()) != null) {
System.out.println(line);
}
} } catch (IOException e) {
System.err.println("Problem: " + e);
} finally
{
if (br != null)
{
try
{
br.close();
}
catch(IOException e) {}
}
}
}
}