使用SAX解析器解析java中的XML文件

问题描述：

我想用java写一个程序并使用saxparser来解析一个像这样的XML文件link ，它执行以下操作; 从输入接收ID和接收ID（只是* ID * S指定的解析和XML文件搜索和写入文本和冠军和用户名（XML标签）之后ns标签是我的意思）在一个文件中。和程序假设为其他四个ID使用SAX解析器解析java中的XML文件

和需要你的帮助做同样的...

public class ReadXMLFile { 
public static int ID_number_1 ; 


public static void main(String[] args) { 

    for(int x=1; x<=5; x++){ 

     if(x==1)System.out.println("enter an integer as ID:\n"); 
     else System.out.println("enter another ID:\n"); 

     try{ 
     Scanner sc = new Scanner(System.in); 

     ID_number_1 = sc.nextInt(); 
     /* 
     * some process happening here; 
     */ 
     SAXParserFactory factory = SAXParserFactory.newInstance(); 
     try{ 

     SAXParser saxParser = factory.newSAXParser(); 
     MyProjectHandler handler = new MyProjectHandler(); 
     saxParser.parse("src\\SAX-XML-FAWiki.xml", handler); 


     } catch (ParserConfigurationException | SAXException | IOException e) { 
      e.printStackTrace(); 
     } 
     /* 
     * 
     */ 
     System.out.println("writing in file "+ID_number_1); 

     switch (x) { 
     case 1: 
      System.out.println("we got your first id :"+ID_number_1); 
      break; 
     case 2: 
      System.out.println("we got your second id :"+ID_number_1); 
      break; 
     case 3: 
      System.out.println("we got your third id :"+ID_number_1); 
      break; 
     case 4: 
      System.out.println("we got your fourth id :"+ID_number_1); 
      break; 
     case 5: 
      System.out.println("we got your fifth id :"+ID_number_1); 
      break; 

     } 

     }catch (Exception e) { 
      System.out.println("You should enter a valid integer"); 
     } 

    } 
}

}

public class MyProjectHandler extends DefaultHandler { 


private FAWiki wiki = null; 


public String getFwkList() { 
    return wiki.toString(); 
} 

boolean bid = false; 
boolean btitle = false; 
boolean btext = false; 

@Override 
    public void startElement(String uri, String localName, String qName, Attributes attributes) 
     throws SAXException{ 

     if(qName.equalsIgnoreCase("id")){ 

      bid = true; 
     } 

    } 

@Override 
public void endElement(String uri, String localName, String qName) throws SAXException { 
    if (qName.equalsIgnoreCase("id")) { 


    } 
} 

@Override 
    public void characters(char ch[], int start, int length) throws SAXException{ 

     if(bid){ 

      int temp = Integer.parseInt(new String(ch, start, length)); 


      if(ReadXMLFile.ID_number_1 == temp){ 

       wiki = new FAWiki(); 
       wiki.setid(temp); 
       btitle = true; 
       btext = true; 

      } 
     } 
     if(btitle){ 
      wiki.settitle(new String(ch, start, length)); 
      btitle = false; 

     } 
     if(btext){ 
      wiki.settext(new String(ch, start, length)); 
      btext = false; 

      System.out.println(getFwkList()); 
     } 
    } 



}

公共类FAWiki {

private String title; 
private int id; 
private String text; 


public String gettitle(){ 
    return title; 
} 
public void settitle(String title){ 
    this.title = title; 
} 
public int getid(){ 
    return id; 
} 
public void setid(int id){ 
    this.id = id; 
} 
public String gettext(){ 
    return text; 
} 
public void settext(String text){ 
    this.text = text; 
} 


public String toString(){ 
    return "<page>\n"+"\t<title>"+this.title+"</title>\n"+"\t<id>"+this.id+" </id>\n"+"\t<text>"+this.text+"</text>\n"+"</page>"; 
} 
}

和我期待这样的结果为每个ID：

<Page> 
    <title>AccessibleComputing</title> 
    <id>654982</id> 
    <text>#REDIRECT [[Computer accessibility]] {{R from CamelCase}}</text> 
    <username>Xqbot</username> 
</Page>

你试过了什么？您是否阅读过[Oracle Tutorial SAX]（http://docs.oracle.com/javase/tutorial/jaxp/sax/parsing.html）？ – ztirom

您应该将上面的代码粘贴到代码“标签”中！ – ztirom

您提供的链接既没有给出您作为注释给出的代码结果，也没有给出您在问题中提到的任何示例。 – Chaitanya

答

谢谢大家（特别是乔普埃根）

我成功地改变我的代码

看到...

public class ReadXMLFile { 

     public static int ID_number_1 ; 

     public static void main(String[] args) { 

      for(int x=1; x<=5; x++) { 

       if(x==1) 
        System.out.println("enter an integer as ID:\n"); 
       else 
        System.out.println("enter your next ID:\n"); 

       try { 
        Scanner sc = new Scanner(System.in); 

        ID_number_1 = sc.nextInt(); 
        switch (x) { 
         case 1: 
          System.out.println("we got your first id :"+ID_number_1); 
          break; 
         case 2: 
          System.out.println("we got your second id :"+ID_number_1); 
          break; 
         case 3: 
          System.out.println("we got your third id :"+ID_number_1); 
          break; 
         case 4: 
          System.out.println("we got your fourth id :"+ID_number_1); 
          break; 
         case 5: 
          System.out.println("we got your fifth id :"+ID_number_1); 
          break; 
        } 

       } catch (Exception e) { 
        System.out.println("You should enter a valid integer"); 
       } 

       /* 
       * some process happening here; 
       */ 
       SAXParserFactory factory = SAXParserFactory.newInstance(); 

       try { 

        SAXParser saxParser = factory.newSAXParser(); 
        MyProjectHandler handler = new MyProjectHandler(); 
        saxParser.parse("src\\SAX-XML-FAWiki.xml", handler); 

        System.out.println(handler.getFwkList()); 

       } catch (ParserConfigurationException | SAXException | IOException e) { 
        e.printStackTrace(); 
      } 
      /* 
      * 
      */ 
      System.out.println("writing in file "+ID_number_1); 
     } 
    } 
} 

public class MyProjectHandler extends DefaultHandler { 


    FAWiki wiki = new FAWiki() ; 
    String titlestr = null; 
    String textstr = null; 
    String usernamestr = null; 

    boolean flag1 = false; 
    boolean flag2 = false; 
    boolean bid = false; 
    boolean btitle = false; 
    boolean btext = false; 
    boolean busername = false; 
    boolean match = false; 
    boolean bns = false; 
    boolean flag3 = false; 

    public String getFwkList() { 
     return wiki.toString(wiki , match); 
    } 

    @Override 
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { 
     if(qName.equalsIgnoreCase("title")) {btitle = true;} 

     if(qName.equalsIgnoreCase("ns")) {bns = true;} 

     if(qName.equalsIgnoreCase("id")) {bid = true;} 

     if(qName.equalsIgnoreCase("text")) {btext = true;} 

     if(qName.equalsIgnoreCase("username")) {busername = true;} 
    } 

    @Override 
    public void endElement(String uri, String localName, String qName) throws SAXException {} 

    @Override 
    public void characters(char ch[], int start, int length) throws SAXException { 

     if(btitle) { 
      titlestr = new String(ch, start, length); 
      btitle= false; 
     } 

     if(bid && bns) { 

      int temp = Integer.parseInt(new String(ch, start, length)); 
      if(ReadXMLFile.ID_number_1 == temp) { 

       wiki.setid(temp); 
       wiki.settitle(titlestr); 
       match = true; 
       btext = false; 
       flag1 = true; 
       busername = false; 
       flag2 = true; 
      }  

      bns = false; 
     } 

     bid = false; 

     if(btext && flag1) { 
      textstr = new String(ch, start, length); 
      wiki.settext(textstr); 
      btext = false; 
      flag1 = false; 
     } 

     if(busername && flag2) { 
      usernamestr = new String(ch, start, length); 
      wiki.setUsername(usernamestr); 
      busername = false; 
      flag2 = false; 
     } 
    } 
} 

public class FAWiki { 

    private String title; 
    private int id; 
    private String text; 
    private String username; 

    public String gettitle() { 
     return title; 
    } 

    public void settitle(String title) { 
     this.title = title; 
    } 

    public int getid() { 
     return id; 
    } 

    public void setid(int id) { 
     this.id = id; 
    } 

    public String gettext() { 
     return text; 
    } 

    public void settext(String text) { 
     this.text = text; 
    } 

    public String getUsername() { 
     return username; 
    } 

    public void setUsername(String username) { 
     this.username = username; 
    } 

    public String toString(FAWiki fwik , Boolean match) { 
     if(match) { 
      return "<page>\n"+"\t<title>"+fwik.gettitle()+"</title>\n"+"\t<id>"+fwik.getid()+"</id>\n"+"\t<text>"+fwik.gettext()+"</text>\n"+"\t<username>"+fwik.getUsername()+"</username>\n"+"</page>"; 
     } else { 
      return "Your entered id doesn't match"; 
     } 
    } 
}

这里只是另一个问题是什么写的最好的方式输出到文件而不是在控制台中打印？

'PrintWriter out = new PrintWriter（file，“UTF-8”）;'' –

答

代码看起来

的InputStream在=的getClass（）的getResourceAsStream（ “/ SAX-XML-FAWiki.xml”）; saxParser.parse（in，handler）;

更好，而不是相对文件。

长文本characters可能会被多次调用。

解析后失踪（我认为）：

String wiki = handler.getFwklist(); 
Path path = Paths.get(ID_number_1); 
Files.write(path, wiki.getBytes(StandardCharsets.UTF_8, 
    StandardOpenOptions.CREATE, StandardOpenOptions.WRITE);

备注：setId/getId资本是惯例。

谢谢大家（特别是Joop Eggen） – mehdi

使用SAX解析器解析java中的XML文件

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