java 一行行读取写入txt文档

package com.ynu.www.tool;

import java.io.*;

import java.util.*;

//流的关闭顺序：先打开的后关，后打开的先关，否则有可能出现java.io.IOException: Stream closed异常

//读取txt文档中的内容，写入数据库。

public class Txt2Database {

private final static String PATH = System.getProperty("user.dir");

public final static String DIR = PATH + "/src/com/ynu/www/data/";

public List<List> readeTxt(String filename) {

// 用于存放txt文件里所有的数据

List txtList = new ArrayList<List>();

try {

// 用来记录读到第几行记录

int id = 0;

FileReader fr = new FileReader(DIR + filename);

BufferedReader bf = new BufferedReader(fr);

String str = null;

while ((str = bf.readLine()) != null) {

// 用于存放txt文件里每行数据

List tempList = new ArrayList<Integer>();

id++;

String[] strs = str.split(" ");

if (strs[0] != null && !strs[0].equals("") && strs[1] != null

&& !strs[1].equals("")) {

tempList.add(Integer.parseInt(strs[0]));

tempList.add(Integer.parseInt(strs[1]));

} else {

System.out.println("读取第" + id + "行txt文档内容时，发现不合要求的数据！");

}

txtList.add(tempList);

}

} catch (Exception e) {

System.out.println("读取txt文档内容时，发生异常！");

e.printStackTrace();

}

return txtList;

}

// 选择合适数量的文本文档数据，写入txt。

public void writerTxt(List<List> txtList) {

try {

FileOutputStream fos = new FileOutputStream("E:/test.txt");

OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8");//一行一行读取文件，解决读取中文字符时出现乱码

BufferedWriter bw = new BufferedWriter(osw);

for (int i = 0; i < txtList.size(); i++) {

List tempList = new ArrayList<Integer>();

tempList = txtList.get(i);

int tempValue0 = (Integer) tempList.get(0);

int tempValue1 = (Integer) tempList.get(1);

if (tempValue0 < 5000 && tempValue1 < 5000) {

bw.write(tempValue0 + " " + tempValue1 + "\r\n");

}

}

// 注意关闭的先后顺序，先打开的后关闭，后打开的先关闭

bw.close();

osw.close();

fos.close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

// 打印list数据

public void printList(List<List> txtList) {

// 用于存放txt文件里每行数据

List tempList = new ArrayList<String>();

for (int i = 0; i < txtList.size(); i++) {

tempList = txtList.get(i);

System.out.print(tempList.get(0) + " " + tempList.get(1));

System.out.println();

}

System.out.println("打印完毕");

}

}