java 获取主机名

import java.net.*;

public class DomainName
{
    public static void outHostName(InetAddress address, String s)
    {
        System.out.println("通过" + s + "创建InetAddress对象");
        System.out.println("主机名:" + address.getCanonicalHostName());
        System.out.println("主机别名:" + address.getHostName());
        System.out.println("");
    }
    public static void main(String[] args) throws Exception
    {
        outHostName(InetAddress.getLocalHost(), "getLocalHost方法");
        outHostName(InetAddress.getByName("www.ibm.com"), "www.ibm.com");
        outHostName(InetAddress.getByName("www.126.com"), "www.126.com");
        outHostName(InetAddress.getByName("202.108.9.77"), "202.108.9.77");
        outHostName(InetAddress.getByName("211.100.26.121"), "211.100.26.121");
    }
} --------------------编程问答-------------------- import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
/**
* 获得盘符序列号
*/
public class GetDiskNum {
public static void main(String[] args) {
System.out.println(getHdSerialInfo());
}

public static String getHdSerialInfo() {

  String line = "";
  String HdSerial = "";//定义变量硬盘序列号

  try {

   Process proces = Runtime.getRuntime().exec("cmd /c dir c:");//获取命令行参数
   BufferedReader buffreader = new BufferedReader(
     new InputStreamReader(proces.getInputStream()));

   while ((line = buffreader.readLine()) != null) {

    if (line.indexOf("卷的序列号是 ") != -1) {  //读取参数并获取硬盘序列号

     HdSerial = line.substring(line.indexOf("卷的序列号是 ")
       + "卷的序列号是 ".length(), line.length());
     break;
     // System.out.println(HdSerial);
    }
   }

  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

  return HdSerial;//返回硬盘序列号卷的序列非物理
}

} --------------------编程问答-------------------- import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import com.xtlh.cn.entity.Book;

public class SaxParseService extends DefaultHandler{
    private List<Book> books = null;
    private Book book = null;
    private String preTag = null;//作用是记录解析时的上一个节点名称

    public List<Book> getBooks(InputStream xmlStream) throws Exception{
        SAXParserFactory factory = SAXParserFactory.newInstance();
        SAXParser parser = factory.newSAXParser();
        SaxParseService handler = new SaxParseService();
        parser.parse(xmlStream, handler);
        return handler.getBooks();
    }

    public List<Book> getBooks(){
        return books;
    }

    @Override
    public void startDocument() throws SAXException {
        books = new ArrayList<Book>();
    }

    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        if("book".equals(qName)){
            book = new Book();
            book.setId(Integer.parseInt(attributes.getValue(0)));
        }
        preTag = qName;//将正在解析的节点名称赋给preTag
    }

    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException {
        if("book".equals(qName)){
            books.add(book);
            book = null;
        }
        preTag = null;/**当解析结束时置为空。这里很重要，例如，当图中画3的位置结束后，会调用这个方法
        ，如果这里不把preTag置为null，根据startElement(....)方法，preTag的值还是book，当文档顺序读到图
        中标记4的位置时，会执行characters(char[] ch, int start, int length)这个方法，而characters(....)方
        法判断preTag!=null，会执行if判断的代码，这样就会把空值赋值给book，这不是我们想要的。*/
    }

    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        if(preTag!=null){
            String content = new String(ch,start,length);
            if("name".equals(preTag)){
                book.setName(content);
            }else if("price".equals(preTag)){
                book.setPrice(Float.parseFloat(content));
            }
        }
    }

}

public class Book {
    private int id;
    private String name;
    private float price;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public float getPrice() {
        return price;
    }
    public void setPrice(float price) {
        this.price = price;
    }
    @Override
    public String toString(){
        return this.id+":"+this.name+":"+this.price;
    }
}
import java.io.InputStream;
import java.util.List;

import junit.framework.TestCase;

import com.xtlh.cn.demo.DomParseService;
import com.xtlh.cn.demo.SaxParseService;
import com.xtlh.cn.entity.Book;

public class ParseTest extends TestCase{

    public void testSAX() throws Throwable{
        SaxParseService sax = new SaxParseService();
        InputStream input = this.getClass().getClassLoader().getResourceAsStream("book.xml");
        List<Book> books = sax.getBooks(input);
        for(Book book : books){
            System.out.println(book.toString());
        }
    }
}

补充：Java ,  Java相关

java 获取 主机名

java 获取主机名