java io读写操作

文件的读取：

public static void duqu(String path) throws IOException
	{
	
		File file=new File(path);
		FileInputStream fis=new FileInputStream(file);
		InputStreamReader isr=new InputStreamReader(fis,"gb2312");
		BufferedReader br=new BufferedReader(isr);
		StringBuffer buf=new StringBuffer();
		String str=null;
		while((str=br.readLine())!=null){
			buf.append(str);
			buf.append("\r\n");
		}
		System.out.println(buf.toString());
		br.close();
	}

文件的写入：
 public static void write(String path, String content) {  
	        String s = new String();  
	        String s1 = new String();  
	          
	        try {  
	            File f = new File(path);  
	              
	            if (f.exists()) {  
	                System.out.println("文件存在");  
	            } else {  
	                System.out.println("文件不存在，正在创建...");  
	                if (f.createNewFile()) {  
	                    System.out.println("文件创建成功！");  
	                } else {  
	                    System.out.println("文件创建失败！");  
	                }  
	            }  
	              
	            BufferedReader input = new BufferedReader(new FileReader(f));  
	  
	            while ((s = input.readLine()) != null) {  
	                s1 += s + "/n";  
	            }  
	          
	            input.close();  
	            s1 += content;  
	            BufferedWriter output = new BufferedWriter(new FileWriter(f));  
	            System.out.println("文件内容：" + s1);  
	            output.write(s1);  
	            output.close();  
	        } catch (Exception e) {  
	            e.printStackTrace();  
	        }  
	    }