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目录

读取本地文件

从网站读取文件 

java爬虫 

 总结

读取本地文件

import java.io.File;
import java.io.PrintWriter;
import java.util.Scanner;

public class ReplaceText {
    public static void main() throws Exception{
        File file = new File("basic\\test.txt");
        if(!file.exists()) {
            System.exit(0);
        }

        File targetFile = new File("basic\\target.txt");
        if(targetFile.exists()) {
            System.exit(1);
        }

        String oldString = "case";
        String newString = "CASE";

        try(
            Scanner input = new Scanner(file);
            PrintWriter output = new PrintWriter(targetFile);
        ) {
            while (input.hasNext()) {
                String src = input.nextLine();
                String dist = src.replaceAll(oldString, newString);
                output.println(d