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一连串的IO操作

发布时间: 2012-10-19 16:53:37 作者: rapoo

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();    }}



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