Java逐行写入字符串到文件

 

这和给文件追加内容是不同的。

 1、

 1     public static void writeFile1() throws IOException {  
 2         File fout = new File("out.txt");  
 3         FileOutputStream fos = new FileOutputStream(fout);  
 4        
 5         BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fos));  
 6        
 7         for (int i = 0; i < 10; i++) {  
 8             bw.write("something");  
 9             bw.newLine();  
10         }  
11        
12         bw.close();  
13     }  
14     

 这个例子使用的是FileOutputStream，你也可以使用FileWriter 或PrintWriter，如果是针对文本文件的操作是完全绰绰有余的。

 

FileWriter：

1 　　public static void writeFile2() throws IOException {  
2         FileWriter fw = new FileWriter("out.txt");  
3        
4         for (int i = 0; i < 10; i++) {  
5             fw.write("something");  
6         }  
7        
8         fw.close();  
9     }  

 

3、使用PrintWriter： 

1     public static void writeFile3() throws IOException {  
2         PrintWriter pw = new PrintWriter(new FileWriter("out.txt"));  
3        
4         for (int i = 0; i < 10; i++) {  
5             pw.write("something");  //这里也可以用 pw.print("something"); 效果一样
6         }  
7        
8         pw.close();  
9     }  

 

4、使用OutputStreamWriter： 

 1    public static void writeFile4() throws IOException {  
 2         File fout = new File("out.txt");  
 3         FileOutputStream fos = new FileOutputStream(fout);  
 4        
 5         OutputStreamWriter osw = new OutputStreamWriter(fos);  
 6        
 7         for (int i = 0; i < 10; i++) {  
 8             osw.write("something");  
 9         }  
10        
11         osw.close();  
12     }  

 

 

摘自Java文档：

 

To specify these values yourself, construct an OutputStreamWriter on a FileOutputStream.

如果要指定编码和字节缓冲区的长度，需要构造OutputStreamWriter。

PrintWriter prints formatted representations of objects to a text-output stream. It does not contain methods for writing raw bytes, for which a program should use unencoded byte streams.

它不包含用于写入原始字节，因为一个程序应该使用未编码的字节流。

PrintWriter在数据的每个字节被写入后自动调用flush 。而FileWriter，调用者必须采取手动调用flush.