一系列的IO操作
最近看到IO操作部分,发现这部分比较模糊了,所以又写一个测试程序来帮忙记忆
如下是代码:
package com.demo;import java.io.*;/** * Created with IntelliJ IDEA. * User: bokee * Date: 12-10-9 * Time: 下午5:38 * To change this template use File | Settings | File Templates. */public class IOTest { public static void main(String[] args) { IOTest client=new IOTest(); //client.consoleIO(); // client.FileIO(); //client.FileIO2(); client.stringIO(); //client.OutTest(); // client.OutTest2(); //client.OutTest3(); client.FileWriterTest(); } /** * console控制台输入测试 */ public void consoleIO() { System.out.println("console控制台输入测试 开始!"); while(true) { BufferedReader reader=new BufferedReader(new InputStreamReader(System.in)) ; try { System.out.println(reader.readLine()); } catch (IOException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } try { reader.close(); } catch (IOException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } } //System.out.println("console控制台输入测试 结束!"); } /** * StringReader测试 */ public void stringIO() { String str="stringIO:阿呆 还是第一 阿!\n换行试试" ; StringReader stringReader=new StringReader(str); //从字符串读取数据的推荐做法 BufferedReader bufferedReader=new BufferedReader(stringReader); String str2=null; try { while((str=bufferedReader.readLine())!=null) System.out.println(str); } catch (IOException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } } /** * 文件读取数据测试 -方式1 * 直接按字符来读取 */ public void FileIO() { System.out.println("文件读取数据测试-方式1 开始!"); BufferedReader reader= null; try { reader = new BufferedReader(new FileReader("data.ini")); } catch (FileNotFoundException e) { //e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. System.out.println("File 'data.ini' not found"); } String buffer=null; try { while (null != (buffer = reader.readLine())) System.out.println(buffer); } catch (IOException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } try { reader.close(); } catch (IOException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } System.out.println("文件读取数据测试-方式1 结束!"); } /** * 文件读取数据测试-方式2 * 先按字节读取,然后转换成字符 */ public void FileIO2() { System.out.println("文件读取数据测试-方式2 开始!"); BufferedInputStream inputStream=null; try { inputStream=new BufferedInputStream(new FileInputStream("data.ini")); } catch (FileNotFoundException e) { // e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. System.out.println("File 'data.ini' not found"); } InputStreamReader inputStreamReader=new InputStreamReader(inputStream); //字节转换成字符 BufferedReader bufferedReader=new BufferedReader(inputStreamReader); String buffer=null; try { while (null != (buffer = bufferedReader.readLine())) System.out.println(buffer); } catch (IOException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } try { bufferedReader.close(); } catch (IOException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } System.out.println("文件读取数据测试-方式2 结束!"); } /** * 文件写的测试 */ public void FileWriterTest() { BufferedWriter bufferedWriter= null; try { bufferedWriter = new BufferedWriter(new FileWriter("data2.ini",true)); bufferedWriter.write("阿呆 还是第一 阿!\n"); bufferedWriter.close(); } catch (IOException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } } /** * 往控制台输出,使用bufferedWriter */ public void OutTest() { BufferedWriter bufferedWriter=new BufferedWriter(new OutputStreamWriter(System.out)) ; try { bufferedWriter.write("OutTest:阿呆 还是第一 阿! \n 还在阿!"); bufferedWriter.newLine(); /** * 使用BufferedWriter的话得手工flush,因此下面使用PrintWriter试试 * 然而 在 FileWriterTest 里面可以看到,没有flush也是可以的,纳闷???????????????????????????????? */ bufferedWriter.flush(); //bufferedWriter.close(); } catch (IOException e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } } /** * 往控制台输出,使用PrintStream * 发现write方法无效 , */ public void OutTest2() { PrintStream printStream=new PrintStream(System.out,true); printStream.println("OutTest2:阿呆 还是第一 阿! \n 还在阿!"); // printStream.close(); } /** * 往控制台输出,使用PrintWriter * 然而可以看到必须使用flush才行. * 还发现一点, OutTest2和OutTest3无法同时使用 * 经过一段时间的测试发现导致outTest3无法运行的原因是 printStream.close(); */ public void OutTest3() { PrintWriter printWriter=new PrintWriter(System.out); printWriter.println("OutTest3:阿呆 还是第一 阿! \n 还在阿!"); printWriter.flush(); //printWriter.close(); }}