java - 使用indexOf(char)和substring(int, int)删除标签内的字符

Question

我试图弄清楚如何编写调用的方法，该方法不会打印 < 之间的字符。和> - 基本上在标签之间。

我需要使用:length() , indexOf(char)和substring(int, int)在 while 循环中。

这是我所拥有的:

import java.io.*; 
import java.util.*; 

public class Project { 


public static void main(String[] args) throws FileNotFoundException   {
 //     final String text = "";
    final String filename = "HTML_2.txt";


    try (Scanner input = new Scanner(new File(

            System.getProperty("user.home"), "HTML_2.txt"))){ //"C:\CS210DataFiles"  

        while (input.hasNextLine()) { 
            String text = stripHtmlTags(input.nextLine());
            System.out.print(stripHtmlTags(text));
    }
    }

        public static String readFile(String filename) throws FileNotFoundException {
    Scanner input = new Scanner(new File("HTML_2.txt"));
    String text = "";
    while (input.hasNextLine()) {
        text += input.nextLine() + "\n";
    }
    return text;
}
public static void stripHtmlTags(String filename) throws FileNotFoundException {
    String text = readFile(filename);
    int leftTag = text.indexOf("<");
    while (leftTag >= 0) {
        String start = text.substring(0, leftTag);
        text = text.substring(leftTag, text.length());
        int rightTag = text.indexOf(">");
        text = start + text.substring(rightTag + 1, text.length());
        leftTag = text.indexOf("<");
    }
    System.out.print(text);
}

}

现在主方法出了问题

Answer 1

这可能对你有帮助

public void printExceptTag(String str) {
    StringBuffer ans= new StringBuffer();
    for(int i= 0; i < str.length(); i++) {
        char ch= str.charAt(i);
        if(ch == '<') {
            i= skipInBetweenTag(str, i);
            continue;
        }
        ans.append(ch);
    }
    System.out.println(ans);
}

public int skipInBetweenTag(String str, int index) {
    while(index < str.length() && str.charAt(index) != '>') index++;
    return index;
}

方法 printExceptTag(String str) 接受一个字符串并打印该字符串，跳过标签之间的字符。

谢谢你..