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如果想向某个文件最后添加内容，可使用FileWriter fw = new FileWriter("log.txt",true);在创建FileWriter时加个true就可以了。

下面是详细的示例代码：

File file = new File("D:/Test.txt");  
File dest = new File("D:/new.txt");  
try {  BufferedReader reader = new BufferedReader(new FileReader(file));  BufferedWriter writer  = new BufferedWriter(new FileWriter(dest,true));  String line = reader.readLine();  while(line!=null){  writer.write(line);  line = reader.readLine();  }  writer.flush();  reader.close();  writer.close();  
} catch (FileNotFoundException e) {  e.printStackTrace();  
} catch (IOException e) {  e.printStackTrace();  
}