saxparser1.java

一个java的解析xml的例子

package xmlsax;

import java.util.*;
import java.io.*;
import java.io.IOException;
import org.xml.sax.*;
import org.xml.sax.helpers.*;
import org.apache.xerces.parsers.SAXParser;

public class SaxParser1 extends DefaultHandler {
  private java.util.Stack  tagStack=new java.util.Stack();
  private String resultXML="";  //写成XML的字符串
  private String indent="";
  private static final java.lang.String NEWLINE=System.getProperty("line.separator");
  private PrintWriter printFile=null;

  private String resultPZ="您所选择的设备类型如下：" + NEWLINE;   //返回所选择的设备类型
  private String resultTXT="";//写成文本的字符串

  String[] res =new String[10];       //类型列表
  int len = 0,sel,selport,f=0;
  String sbname,tag;

  public static void main(String[] argv) {
    if (argv.length != 1) {
      System.out.println("Usage: java SaxParser1 [URI]");
      System.exit(0);
    }
    String uri = argv[0];
    try {
      XMLReader parser = XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");
      SaxParser1 SaxParser1Instance = new SaxParser1();
      parser.setContentHandler(SaxParser1Instance);
      parser.parse(uri);
    }
    catch(IOException ioe) {
      ioe.printStackTrace();
    }
    catch(SAXException saxe) {
      saxe.printStackTrace();
    }
  }
//将字符串中的单词拆开
  public String[] sTOc(String temp){
    String[] res =new String[10];
    StringTokenizer st = new StringTokenizer(temp);
    len = 0;
    while(st.hasMoreTokens())
      res[len++] = st.nextToken() + " " + sbname;
    return res;
  }
//显示外设选择菜单
  private int selectSb(String[] sb) {
    int i;
    String s = "";
    String ask = "\n确认请按回车,或选择其它";
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

    System.out.println("请在下列" + sbname + "类型中选择一种\n");
    for(i=0;i<len;i++)
      System.out.println("        " + i +"."+ sb[i] + "\n");
    i=0;
    System.out.println("请输入0 -- " + (len-1) + "(直接回车，默认选择0)：");
    try {
      s = in.readLine();
      Integer tt=new java.lang.Integer(0);
      while ( s.length() != 0) {
      	i=tt.valueOf(s).intValue();
        if(i<len && i>=0)
            System.out.println("您选择的" + sbname + "是: " + sb[i] + "\n" + ask + sbname);
        else
            System.out.println("错误的选择!!");
        s = in.readLine();
      }
    } catch (IOException e) {
        e.printStackTrace();
      }
    return i;
  }
//显示所用端口选择菜单
  private int selectPort(String sbname) {
    int i;
    String s = "";
    String ask = "\n确认请按回车,或选择其它";
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

    System.out.println("请为" + sbname + "选择一种辅口\n");
    i=1;
    System.out.println("请输入1 或 2 或 3 分别代表辅口1、2、3(直接回车，默认选择1)：");
    try {
      s = in.readLine();
      Integer tt=new java.lang.Integer(0);
      while ( s.length() != 0) {
      	i=tt.valueOf(s).intValue();
        if(i<3 && i>=0)
            System.out.println("您为" + sbname + "设备选择的辅口是: " + i + "\n" + ask + sbname);
        else
            System.out.println("错误的选择!!");
        s = in.readLine();
      }
    } catch (IOException e) {
        e.printStackTrace();
      }
    return i;
  }

  private String locateValue(String tagName) {
    return sbname;
  }

    /**@todo: Implement this characters method*/
  public void characters(char[] ch, int start, int length) throws SAXException {
    String value = new String(ch, start, length);
    if(f == 1){
      resultTXT=resultTXT+value+"}"+NEWLINE;
      f = 0;
    }
  }

    /**@todo: Implement this endDocument method*/
  public void endDocument() throws SAXException {
    String ask = "\n确认请按回车,或输入其它文件名：";
    String s = "";
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    String filename = "config.ini";
    System.out.println(resultPZ);

    System.out.println("您是否将上面的选择保存为配置文件Y/N(直接回车，默认选择N)：");
    try {
      s = in.readLine();
      if ( s.length() != 0) {
        if(s.equals("Y")|| s.equals("y")){
            System.out.println("您是否保存为：" + filename + "\n" + ask);
            s = in.readLine();
           if ( s.length() != 0)
              filename = s;
            try {
                printFile=new PrintWriter(new FileWriter(filename));
                printFile.print(resultTXT);
                printFile.close();
                System.out.println("您已成功保存配置文件：" + filename);
            } catch(IOException e) {
                System.out.println("打开 " + filename + " 时出错:"+e);
            }
        }
      }
    } catch (IOException e) {
        e.printStackTrace();
      }

  }

    /**@todo: Implement this endElement method*/
  public void endElement(String uri, String localName, String qName) throws SAXException {
    if(localName.equals("trnDef")) {
	}
	else if(localName.equals("Device")) {
		String tagName=(String)tagStack.pop();
		indent=indent.substring(0,indent.length()-4);
                  resultXML=resultXML+indent+"</"+tagName+">"+NEWLINE;
	}
	else if(localName.equals("Name")) {
		String tagName=(String)tagStack.pop();
		indent=indent.substring(0,indent.length()-4);
                if (res[sel].equals(tag))
                resultXML=resultXML+indent+"</"+tagName+">"+NEWLINE;
              else
                tag = "";
	}
  }

    /**@todo: Implement this startDocument method*/
  public void startDocument() throws SAXException {
  }

    /**@todo: Implement this startElement method*/
  public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
    if(localName.equals("Def")) {
	}
	else if(localName.equals("Device")) {
		String tagName=attributes.getValue(0);
                String tagValue=attributes.getValue(1);
                sbname = tagName;
                res=sTOc(tagValue);
                sel=selectSb(res);
                if (tagName.equals("密码键盘") || tagName.equals("读卡器"))
                   selport=selectPort(tagName);

        	tagStack.push(tagName);
                tag = tagName + " " + sbname;
                resultXML=resultXML+indent+"<"+tagName+">"+NEWLINE;
		indent+="    ";
                resultPZ=resultPZ+tagName+"=";      //返回设备名
                resultTXT=resultTXT+"<"+tagName+"=";      //返回设备名

	}
	else if(localName.equals("Name")) {
		String tagName=attributes.getValue(0);
         	tagStack.push(tagName);
                tag = tagName + " " + sbname;
                if (res[sel].equals(tag)){
                  resultXML=resultXML+indent+"<"+tagName+">"+NEWLINE;
                  resultPZ=resultPZ+tagName+NEWLINE;  //返回设备类型
                  resultTXT=resultTXT+tagName+">"+NEWLINE;  //返回设备类型
                if (sbname.equals("读卡器")){
                  resultTXT=resultTXT+"{MSR_PORT="+selport+"}"+NEWLINE;
                  resultPZ=resultPZ+"MSR_PORT="+selport+NEWLINE;  //返回设备类型
                 }else
                 if(sbname.equals("密码键盘")){
                  resultTXT=resultTXT+"{PINPAD_PORT="+selport+"}"+NEWLINE;
                  resultPZ=resultPZ+"PINPAD_PORT="+selport+NEWLINE;  //返回设备类型
                 }
               }
		indent+="    ";
	}
	else if(localName.equals("Values")) {
		String tagName=attributes.getValue(0);
		String tagValue=locateValue(tagName);
		if(!tagValue.equals("")) {
                if (res[sel].equals(tag)){
                  resultXML=resultXML+indent+"<"+tagName+">"+tagValue+"</"+tagName+">"+NEWLINE;
 //                 resultTXT=resultTXT+"{"+tagName+"="+tagValue+"}"+NEWLINE;
                  resultTXT=resultTXT+"{"+tagName+"=";
                  f = 1;
                }
		}
	}
  }
}