readfileline.java

留学生信息管理系统 我的工程实习的项目

package test1;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.RandomAccessFile;

public class ReadFileLine {
	public  void readFileByRandomAccess(String fileName,String str){
		
		  RandomAccessFile  randomFile = null;
		  try {


		   int beginIndex = 0;
		  
			   FileReader  fr = new FileReader(fileName);
			   BufferedReader  br = new BufferedReader(fr);
//			   StringBuffer sBuffer = new StringBuffer();
			  String Line = br.readLine();// 从文件读取一行字符串
	            // 判断读取到的字符串是否不为空
	            while (Line != null){ 
	            if( Line.indexOf(str)>0){
	            	beginIndex=Line.indexOf(str);
	            	 br.close();
	            	 fr.close();
	            	continue;
	            }
	            else
	                Line = br.readLine();// 从文件中继续读取一行数据
	            }
	            
	            
	 		   randomFile = new RandomAccessFile(fileName, "r");
	 		   randomFile.seek(beginIndex);
			   byte[] bytes = new byte[10];
			   int byteread = 0;
			   while ((byteread = randomFile.read(bytes)) != -1){
					    System.out.write(bytes, 0, byteread);
					}
	        
		  } catch (IOException e){
		   e.printStackTrace();
		  } finally {
		   if (randomFile != null){
		    try {
		     randomFile.close();
		    } catch (IOException e1) {
		    }
		   }
		  }
		 }
	public static void main(String [] args){
		
		ReadFileLine f=new ReadFileLine();
		f.readFileByRandomAccess("D:\\Tomcat 6.0\\log.txt","2005-12-27");
	}


}