java流对文件和文件内容的基本操作

对于文件的基本操作。

public class FileIOTest{

    /*读取文件内容*/
    public String readContext ( String filePath ){
        String result = "" ;
        String text = "" ;
        BufferedReader br = null ;
        try{
            br = new BufferedReader( new FileReader( filePath ) ) ;
            while ( ( text = br.readLine() ) != null )
                result = result + text + "\n\r" ;
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            try{
                br.close();
            }catch(Exception e){
                e.printStackTrace();
            }
        }
        return result ;
    }

    /*文件中写入内容*/
    public void addContext( String filePath ,String text){
        BufferedWriter bw = null ;
        try{
            bw = new BufferedWriter( new FileWriter(filePath) ) ;
            bw.write(text);
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            try{
                bw.close();
            }catch(Exception e){
                e.printStackTrace();
            }
        }
    }

    /*创建一个文件*/
    public void createFile ( String filePath ) throws Exception {
        File file = new File( filePath ) ;
        if ( !file.exists() )
            file.createNewFile() ;
    }

    public static void main (String args[]) throws Exception {
        String filePath = "D:\\111.txt" ;
        FileIOTest ft = new FileIOTest() ;
        ft.createFile( filePath );
        ft.addContext(filePath , "男人!\r\n女人!\r\nMAN and woman!");
        System.out.println(ft.readContext(filePath)) ;
    }
}