java文本替换（单文件）

最新推荐文章于 2024-05-15 11:01:43 发布

原创最新推荐文章于 2024-05-15 11:01:43 发布 · 175 阅读

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本文介绍了一个简单的Java程序，该程序能够从文件中读取文本，并将指定字符串替换为新的字符串，然后将修改后的内容写回到源文件。示例中演示了如何将文本中的'public'替换为'private'。

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class StringRpl {

	public static String read(File src) {
		StringBuffer res = new StringBuffer();
		String line = null;
		try {
			BufferedReader reader = new BufferedReader(new FileReader(src));
			while ((line = reader.readLine()) != null) {
				res.append(line + "\n");
			}
			reader.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return res.toString();
	}

	public static boolean write(String cont, File dist) {
		try {
			BufferedWriter writer = new BufferedWriter(new FileWriter(dist));
			writer.write(cont);
			writer.flush();
			writer.close();
			return true;
		} catch (IOException e) {
			e.printStackTrace();
			return false;
		}
	}

	public StringRpl() {
	}

	public static void main(String[] args) {
		File src = new File("a.txt");
		String cont = StringRpl.read(src);
		System.out.println(cont);
		// 对得到的内容进行处理
		cont = cont.replaceAll("public", "private");
		System.out.println(cont);
		// 更新源文件
		System.out.println(StringRpl.write(cont, src));
	}

}

替换结果：

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

private class StringRpl {

	private static String read(File src) {
		StringBuffer res = new StringBuffer();
		String line = null;
		try {
			BufferedReader reader = new BufferedReader(new FileReader(src));
			while ((line = reader.readLine()) != null) {
				res.append(line + "\n");
			}
			reader.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return res.toString();
	}

	private static boolean write(String cont, File dist) {
		try {
			BufferedWriter writer = new BufferedWriter(new FileWriter(dist));
			writer.write(cont);
			writer.flush();
			writer.close();
			return true;
		} catch (IOException e) {
			e.printStackTrace();
			return false;
		}
	}

	private StringRpl() {
	}

	private static void main(String[] args) {
		File src = new File("a.txt");
		String cont = StringRpl.read(src);
		System.out.println(cont);
		// 对得到的内容进行处理
		cont = cont.replaceAll("private", "private");
		System.out.println(cont);
		// 更新源文件
		System.out.println(StringRpl.write(cont, src));
	}

}

true