java怎么去掉html标签

我会带着你远行 2024-03-17 12:32 74阅读 0赞

> java去掉html标签的方法：  
> 1、通过纯正则方法去掉html标签；  
> 2、使用“javax.swing.text.html.HTMLEditorKit”去掉html标签；  
> 3、通过使用Jsoup框架去掉html标签等等。

**一.纯正则方法**

import java.util.regex.Matcher; 
    import java.util.regex.Pattern; 
     
    public class HTMLSpirit{
         
        public static String delHTMLTag(String htmlStr){
         
            String regEx_script="<script[^>]*?>[\\s\\S]*?<\\/script>"; //定义script的正则表达式 
            String regEx_style="<style[^>]*?>[\\s\\S]*?<\\/style>"; //定义style的正则表达式 
            String regEx_html="<[^>]+>"; //定义HTML标签的正则表达式 
              
            Pattern p_script=Pattern.compile(regEx_script,Pattern.CASE_INSENSITIVE); 
            Matcher m_script=p_script.matcher(htmlStr); 
            htmlStr=m_script.replaceAll(""); //过滤script标签 
              
            Pattern p_style=Pattern.compile(regEx_style,Pattern.CASE_INSENSITIVE); 
            Matcher m_style=p_style.matcher(htmlStr); 
            htmlStr=m_style.replaceAll(""); //过滤style标签 
              
            Pattern p_html=Pattern.compile(regEx_html,Pattern.CASE_INSENSITIVE); 
            Matcher m_html=p_html.matcher(htmlStr); 
            htmlStr=m_html.replaceAll(""); //过滤html标签 
     
            return htmlStr.trim(); //返回文本字符串 
        } 
    }

**二.使用 javax.swing.text.html.HTMLEditorKit**

import java.io.IOException;
    import java.io.FileReader;
    import java.io.Reader;
    import java.util.List;
    import java.util.ArrayList;
     
    import javax.swing.text.html.parser.ParserDelegator;
    import javax.swing.text.html.HTMLEditorKit.ParserCallback;
    import javax.swing.text.html.HTML.Tag;
    import javax.swing.text.MutableAttributeSet;
     
    public class HTMLUtils {
        
      private HTMLUtils() {
        }
     
      public static List<String> extractText(Reader reader) throws IOException {
        
        final ArrayList<String> list = new ArrayList<String>();
     
        ParserDelegator parserDelegator = new ParserDelegator();
        ParserCallback parserCallback = new ParserCallback() {
        
          public void handleText(final char[] data, final int pos) {
        
            list.add(new String(data));
          }
          public void handleStartTag(Tag tag, MutableAttributeSet attribute, int pos) {
         }
          public void handleEndTag(Tag t, final int pos) {
          }
          public void handleSimpleTag(Tag t, MutableAttributeSet a, final int pos) {
         }
          public void handleComment(final char[] data, final int pos) {
         }
          public void handleError(final java.lang.String errMsg, final int pos) {
         }
        };
        parserDelegator.parse(reader, parserCallback, true);
        return list;
      }
     
      public final static void main(String[] args) throws Exception{
        
        FileReader reader = new FileReader("java-new.html");
        List<String> lines = HTMLUtils.extractText(reader);
        for (String line : lines) {
        
          System.out.println(line);
        }
      }
    }

**三.使用Jsoup框架**

import java.io.IOException;
    import java.io.FileReader;
    import java.io.Reader;
    import java.io.BufferedReader;
    import org.jsoup.Jsoup;
     
    public class HTMLUtils {
        
      private HTMLUtils() {
        }
     
      public static String extractText(Reader reader) throws IOException {
        
        StringBuilder sb = new StringBuilder();
        BufferedReader br = new BufferedReader(reader);
        String line;
        while ( (line=br.readLine()) != null) {
        
          sb.append(line);
        }
        String textOnly = Jsoup.parse(sb.toString()).text();
        return textOnly;
      }
     
      public final static void main(String[] args) throws Exception{
        
        FileReader reader = new FileReader
              ("C:/RealHowTo/topics/java-language.html");
        System.out.println(HTMLUtils.extractText(reader));
      }

**四.使用Apache Tika**

mport java.io.FileInputStream;
    import java.io.InputStream;
     
    import org.apache.tika.metadata.Metadata;
    import org.apache.tika.parser.AutoDetectParser;
    import org.apache.tika.parser.ParseContext;
    import org.apache.tika.parser.Parser;
    import org.apache.tika.sax.BodyContentHandler;
    import org.xml.sax.ContentHandler;
     
    public class ParseHTMLWithTika {
        
      public static void main(String args[]) throws Exception {
        
     
        InputStream is = null;
        try {
        
     
             is = new FileInputStream("C:/Temp/java-x.html");
            WriteOutContentHandler contenthandler = new WriteOutContentHandler(100000000);
             Metadata metadata = new Metadata();
             Parser parser = new AutoDetectParser();
             parser.parse(is, contenthandler, metadata, new ParseContext());
             System.out.println(contenthandler.toString());
        }
        catch (Exception e) {
        
          e.printStackTrace();
        }
        finally {
        
            if (is != null) is.close();
        }
      }
    }

> 注意这里经过本人实验有个小坑，WriteOutContentHandler参数是限制的字符数，这个如果不设置默认是1万，超过会报异常。
> 
> 具体的jar包请自行到中央仓库里搜索依赖配置
> 
> https://search.maven.org/ 和 https://mvnrepository.com/

**工具类**

public class ResourceUtil {
        
        /**
         * 根据当前类路径，获取资源文件夹对应文件的所有字符串
         *
         * @param currentClass 如 this.class
         * @param resourcePath 如 /data/json/xxx.json （相对于resources文件夹）
         */
        public static String resource2String(Class currentClass, String resourcePath) throws IOException {
        
            return IOUtils.toString(new FileReader(new File(currentClass.getResource(resourcePath).getFile())));
        }
     
    }