如何選擇 Java 中最好的 CSS 解析器？

Java 中的CSS 解析器選項

簡介

探索 CSS 解析器選項

一個值得注意的選項是

CSSParser。它的錯誤回饋功能很有價值，這裡有一個修改後的程式碼範例供您參考：

<code class="java">package com.dlogic;

import com.steadystate.css.parser.CSSOMParser;
import org.w3c.css.sac.InputSource;
import org.w3c.dom.css.CSSStyleSheet;
import org.w3c.dom.css.CSSRuleList;
import org.w3c.dom.css.CSSRule;
import org.w3c.dom.css.CSSStyleRule;
import org.w3c.dom.css.CSSStyleDeclaration;
import java.io.*;

// Main class
public class CSSParserTest 
{

    public static void main(String[] args) {

        CSSParserTest oParser = new CSSParserTest();

        if (oParser.Parse("design.css")) {

            System.out.println("Parsing completed OK");

        } else {

            System.out.println("Unable to parse CSS");

        }   
    }


    public boolean Parse(String cssfile) 
    {

        FileOutputStream out = null; 
        PrintStream ps = null; 
        boolean rtn = false;

        try
        {
            // Access CSS file as a resource
            InputStream stream = oParser.getClass().getResourceAsStream(cssfile);

            // Create log file
            out = new FileOutputStream("log.txt");
            if (out != null)
            {
                ps = new PrintStream(out);
                System.setErr(ps); // Redirect stderr to log file
            } else {

                return rtn; 

            }


            // Parse CSS file
            InputSource source = new InputSource(new InputStreamReader(stream));
            CSSOMParser parser = new CSSOMParser();
            CSSStyleSheet stylesheet = parser.parseStyleSheet(source, null, null);

            // Inspect CSS DOM
            CSSRuleList ruleList = stylesheet.getCssRules();
            ps.println("Number of rules: " + ruleList.getLength());

            for (int i = 0; i < ruleList.getLength(); i++) 
            {
                CSSRule rule = ruleList.item(i);
                if (rule instanceof CSSStyleRule) 
                {
                    CSSStyleRule styleRule = (CSSStyleRule)rule;
                    ps.println("selector:" + i + ": " + styleRule.getSelectorText());
                    CSSStyleDeclaration styleDeclaration = styleRule.getStyle();

                    for (int j = 0; j < styleDeclaration.getLength(); j++) 
                    {
                        String property = styleDeclaration.item(j);
                        ps.println("property: " + property);
                        ps.println("value: " + styleDeclaration.getPropertyCSSValue(property).getCssText());
                        ps.println("priority: " + styleDeclaration.getPropertyPriority(property));   
                    }
                }
            }

            if (out != null) out.close();
            if (stream != null) stream.close();
            rtn = true;
        }
        catch (IOException ioe)
        {
            System.err.println ("IO Error: " + ioe);
        }
        catch (Exception e)
        {
            System.err.println ("Error: " + e);
        }
        finally
        {
            if (ps != null) ps.close(); 
        }

        return rtn;

    }
}</code>

測試CSS 解析器

要測試解析器，請放置一個CSS在來源目錄中建立名為「design.css」的檔案並執行CSSParserTest 的main 方法。輸出將記錄到“log.txt”並包含有關 CSS 規則和样式的詳細資訊。

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