获取 java.lang.StringIndexOutOfBoundsException ：字符串索引超出范围：（无法弄清楚）

发布于 2024-11-03 18:22:42 字数 2148 浏览 4 评论 0原文

我有一段代码 -

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

import org.eclipse.core.runtime.Platform;

public class RAF {

    public static void main(String[] args) {

          File file = new File("test.txt");
          Scanner scanner;
        try {
            scanner = new Scanner(file).useDelimiter("\n");
            String line = scanner.next();
              String newLine = line.substring(0, 252) + "<input type=\"button\" value = \"abhishek\" />" + line.substring(252);
              FileWriter writer = new FileWriter(file);
              writer.write(newLine);
              writer.close();

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

}

test.txt 文件是 -

> <!DOCTYPE html PUBLIC "-//W3C//DTD
> HTML 4.01 Transitional//EN"
> "http://www.w3.org/TR/html4/loose.dtd">
> <html> <head> <meta
> http-equiv="Content-Type"
> content="text/html;
> charset=ISO-8859-1"> <title>Insert
> title here</title> </head> <body>
> 
> <form><input></form> </body> </html>

test.txt 的总长度是 285，我想在 252 位置添加内容，以便输出为 -

> "http://www.w3.org/TR/html4/loose.dtd">
> <html> <head> <meta
> http-equiv="Content-Type"
> content="text/html;
> charset=ISO-8859-1"> <title>Insert
> title here</title> </head> <body>
> 
> <form>**<input type="button" value =
> "abhishek"/>**<input></form> </body>
> </html>

但我遇到了例外 - 线程“main”中的异常 java.lang.StringIndexOutOfBoundsException：字符串索引超出范围：252 在 java.lang.String.substring（来源未知）在 com.lg.palette.elementEditFactory.RAF.main(RAF.java:25)

代码有什么问题我的主要目标是获取第二个 test.txt 中所示的内容

原文

I have a piece of code -

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

import org.eclipse.core.runtime.Platform;

public class RAF {

    public static void main(String[] args) {

          File file = new File("test.txt");
          Scanner scanner;
        try {
            scanner = new Scanner(file).useDelimiter("\n");
            String line = scanner.next();
              String newLine = line.substring(0, 252) + "<input type=\"button\" value = \"abhishek\" />" + line.substring(252);
              FileWriter writer = new FileWriter(file);
              writer.write(newLine);
              writer.close();

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

}

and the test.txt file is -

> <!DOCTYPE html PUBLIC "-//W3C//DTD
> HTML 4.01 Transitional//EN"
> "http://www.w3.org/TR/html4/loose.dtd">
> <html> <head> <meta
> http-equiv="Content-Type"
> content="text/html;
> charset=ISO-8859-1"> <title>Insert
> title here</title> </head> <body>
> 
> <form><input></form> </body> </html>

The total length of test.txt is 285 and I want to add the content at 252 location so that the output will be -

> "http://www.w3.org/TR/html4/loose.dtd">
> <html> <head> <meta
> http-equiv="Content-Type"
> content="text/html;
> charset=ISO-8859-1"> <title>Insert
> title here</title> </head> <body>
> 
> <form>**<input type="button" value =
> "abhishek"/>**<input></form> </body>
> </html>

But I am getting exception -
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 252
at java.lang.String.substring(Unknown Source)
at com.lg.palette.elementEditFactory.RAF.main(RAF.java:25)

What is the problem with the code
My main objective is to get the content as shown in the 2nd test.txt

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