代码改变世界

常见IO操作

2020-11-22 23:26  Spiderman25  阅读(100)  评论(0)    收藏  举报 
 1 public class MyTest {
 2 
 3     public static void main(String[] args) throws IOException {
 4         String readPath="/readPath/x.txt";
 5         String writePath="/writePath/t.txt";
 6         File file=new File(readPath);
 7         InputStreamReader inputStreamReader = new InputStreamReader(new FileInputStream(file), "UTF-8");
 8         BufferedReader br = new BufferedReader(inputStreamReader);
 9         //BufferedReader br = new BufferedReader(new FileReader(file));
10         StringBuilder result=new StringBuilder();
11         result.append("标题");
12         result.append(System.lineSeparator());
13         String s;
14         while ((s=br.readLine())!=null){
15             result.append(s);
16             result.append(System.lineSeparator());
17             //result.append("\r\n");//windows
18             //result.append("\n");//linux
19             //result.append("\r");//mac
20         }
21         br.close();
22         write(writePath,result.toString());
23     }
24     public static void write(String path,String content) throws IOException {
25         BufferedWriter bw=new BufferedWriter(new FileWriter(path));
26         bw.write(content);
27         bw.newLine();//这也可以换行
28         bw.close();
29     }
30 }

 Scanner:https://blog.csdn.net/qq_40164190/article/details/81917208

 1 public Object deepClone() throws IOException, ClassNotFoundException {  
 2   
 3         /* 写入当前对象的二进制流 */  
 4         ByteArrayOutputStream bos = new ByteArrayOutputStream();  
 5         ObjectOutputStream oos = new ObjectOutputStream(bos);  
 6         oos.writeObject(this);  
 7   
 8         /* 读出二进制流产生的新对象 */  
 9         ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());  
10         ObjectInputStream ois = new ObjectInputStream(bis);  
11         return ois.readObject();  
12     }