Java中如何将文本追加到文件呢?

文本追加到文件的实现思路:
     使用Files.write和StandardOpenOption.APPEND
	    可将文本追加到文件中
try {
		// Create file if doesn't exist, write to it
		// If file exist, append it
		Files.write(Paths.get("app.log"), "Hello World".getBytes(),
				StandardOpenOption.CREATE, StandardOpenOption.APPEND);
 
	} catch (IOException x) {
		//...
	}

Files.write

package com.java265;
 
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.Arrays;
import java.util.list;
 
public class FileExample {
 
    public static void main(String[] args) {
 
        Charset utf8 = StandardCharsets.UTF_8;
        List<String> list = Arrays.asList("第一行信息", "第二行信息");
 
        try {
            Files.write(Paths.get("app.log"), list, utf8,
                    StandardOpenOption.CREATE, StandardOpenOption.APPEND);
        } catch (IOException x) {
            System.err.format("IOException: %s%n", x);
        }
    }
}

BufferedWriter

 启用append模式
  append true作为第二个参数传递给FileWriter 。

package com.java265;
 
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
 
public class BufferedWriterExample {
    public static void main(String[] args) {
        List<String> list = Arrays.asList("第一行信息", "第二行信息");
 
		// append mode
        try (FileWriter writer = new FileWriter("app.log", true);
             BufferedWriter bw = new BufferedWriter(writer)) {
 
            for (String s : list) {
                bw.write(s);
                bw.write("\n");
            }
 
        } catch (IOException e) {
            System.err.format("IOException: %s%n", e);
        }
    }
}