Java读写txt文件

 笔试的时候想不起来怎么写了。留个代码作纪念

package common;import java.io.*;import java.util.ArrayList;public class IOTest {public static void main (String args[]) {ReadDate();WriteDate();} /** * 读取数据 */ public static void ReadDate() { String url = "e:/2.txt"; try { FileReader read = new FileReader(new File(url)); StringBuffer sb = new StringBuffer(); char ch[] = new char[1024]; int d = read.read(ch); while(d!=-1){ String str = new String(ch,0,d); sb.append(str); d = read.read(ch); } System.out.print(sb.toString()); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * 写入数据 */ public static void WriteDate() { try{File file = new File("D:/abc.txt");if (file.exists()) {file.delete();}file.createNewFile();BufferedWriter output = new BufferedWriter(new FileWriter(file)); ArrayList ResolveList = new ArrayList();for (int i = 0; i < 10; i++) {ResolveList.add(Math.random()* 100);}for (int i=0 ;i<ResolveList.size(); i++) {output.write(String.valueOf(ResolveList.get(i)) + "/n");}output.close();} catch (Exception ex) {System.out.println(ex);} }}