JAVA读写文本文档的例子_bufferedwriter writer = new bufferedwriter(new fil-优快云博客

本文链接：https://blog.youkuaiyun.com/yejiajun945/article/details/38756477

本文提供了一个使用Java进行文件读写的示例程序。通过BufferedWriter和BufferedReader类实现向文件追加写入和逐行读取的功能，并展示了如何处理常见的IO异常。

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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 FileTest {

	public void write2File(String path){
		try {
			BufferedWriter writer = new BufferedWriter(new FileWriter(new File(path),true));
			String string = "This is a txt\n";
			writer.append(string);
			writer.flush();
			writer.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	public void readFromFile(String path){
		try {
			BufferedReader reader = new BufferedReader(new FileReader(new File(path)));
			String string;
			while((string = reader.readLine()) != null ){
				System.out.println(string);
			}
			reader.close();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	
	public static void main(String args[]){
		String path = "D://test.txt";
		FileTest test = new FileTest();
		for(int i = 0; i < 10; i++ ){
			test.write2File(path);
		}
		test.readFromFile(path);
	}
}

注意BufferedWriter writer = new BufferedWriter(new FileWriter(new File(path),true));要添加一个参数true

如果是true，则将内容写到文件的末尾处，否则会写在开头处。