Java文本文件的按行读取

Love The Way You Lie 2022-05-10 04:03 164阅读 0赞

package my;
     
    import java.io.BufferedReader;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileReader;
    import java.io.InputStream;
    import java.io.InputStreamReader;
     
    public class HelloWorld
    {
    	//以File作为输入源File->FileReader
    	public static void test1(File source) throws Exception { 
    		FileReader m=new FileReader(source);
    		BufferedReader reader=new BufferedReader(m);
    		
    		while(true) {
    			String nextline=reader.readLine();
    			if(nextline==null) break;
    			System.out.println("got:"+nextline);
    		}
    		reader.close();
    		
    	}
    	
    	//以InputStream作为输入源 InputStream->InputStreamReader
    	public static void test2(InputStream source)throws Exception{
    		InputStreamReader m=new InputStreamReader(source,"GBK");
    		BufferedReader reader=new BufferedReader(m);
    		
    		while(true) {
    			String nextline=reader.readLine();
    			if(nextline==null) break;
    			System.out.println("got:"+nextline);
    		}
    		reader.close();
    	}
    	
    	public static void test3()throws Exception
    	{
    		InputStreamReader m=new InputStreamReader(System.in);
    		BufferedReader reader=new BufferedReader(m);
    		while(true) {
    			System.out.print(">");
    			String nextline=reader.readLine();
    			if(nextline==null) break;
    			if("exit".equals(nextline)) {
    				System.out.println("Good Bye");
    				break;
    			}
    			//处理用户输入
    			System.out.println("handle command:"+nextline);
    		}
    		reader.close();
    	}
     
    	public static void main(String[] args){	
    		try {
    			test1(new File("C:/example/aaa"));
    			//test2(new FileInputStream("c:/example/aaa"));
    			//test3();
    		}catch(Exception e)
    		{
    			e.printStackTrace();
    		}
    	}
    }