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java一行一行写入或读取数据

原文:http://www.cnblogs.com/linjiqin/archive/2011/03/23/1992250.html

假如E:/phsftp/evdokey目录下有个evdokey_201103221556.txt文件,

现在对evdokey_201103221556.txt文件进行写入或读取操作,并解决写入或读取出现的乱码问题。

               

文件内容如:

zhangsan,23,福建 lisi,30,上海 wangwu,43,北京 laolin,21,重庆 ximenqing,67,贵州

                

代码如下:

/**     * 一行一行读取文件,适合字符读取,若读取中文字符时会出现乱码     *      * 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     *      * @throws IOException      */    @Test    public void readFile01() throws IOException {        FileReader fr=new FileReader("E:/phsftp/evdokey/evdokey_201103221556.txt");        BufferedReader br=new BufferedReader(fr);        String line="";        String[] arrs=null;        while ((line=br.readLine())!=null) {            arrs=line.split(",");            System.out.println(arrs[0] + " : " + arrs[1] + " : " + arrs[2]);        }        br.close();        fr.close();    }        /**     * 一行一行读取文件,解决读取中文字符时出现乱码     *      * 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     *      * @throws IOException      */    @Test    public void readFile02() throws IOException {        FileInputStream fis=new FileInputStream("E:/phsftp/evdokey/evdokey_201103221556.txt");        InputStreamReader isr=new InputStreamReader(fis, "UTF-8");        BufferedReader br = new BufferedReader(isr);        //简写如下        //BufferedReader br = new BufferedReader(new InputStreamReader(        //        new FileInputStream("E:/phsftp/evdokey/evdokey_201103221556.txt"), "UTF-8"));        String line="";        String[] arrs=null;        while ((line=br.readLine())!=null) {            arrs=line.split(",");            System.out.println(arrs[0] + " : " + arrs[1] + " : " + arrs[2]);        }        br.close();        isr.close();        fis.close();    }        /**     * 一行一行写入文件,适合字符写入,若写入中文字符时会出现乱码     *      * 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     *      * @throws IOException      */    @Test    public void writeFile01() throws IOException {        String[] arrs={            "zhangsan,23,FuJian",            "lisi,30,ShangHai",            "wangwu,43,BeiJing",            "laolin,21,ChongQing",            "ximenqing,67,GuiZhou"        };        FileWriter fw=new FileWriter(new File("E:/phsftp/evdokey/evdokey_201103221556.txt"));        //写入中文字符时会出现乱码        BufferedWriter  bw=new BufferedWriter(fw);        //BufferedWriter  bw=new BufferedWriter(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File("E:/phsftp/evdokey/evdokey_201103221556.txt")), "UTF-8")));        for(String arr:arrs){            bw.write(arr+"\t\n");        }        bw.close();        fw.close();    }        /**     * 一行一行写入文件,解决写入中文字符时出现乱码     *      * 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     *      * @throws IOException      */    @Test    public void writeFile02() throws IOException {        String[] arrs={                "zhangsan,23,福建",                "lisi,30,上海",                "wangwu,43,北京",                "laolin,21,重庆",                "ximenqing,67,贵州"        };        //写入中文字符时解决中文乱码问题        FileOutputStream fos=new FileOutputStream(new File("E:/phsftp/evdokey/evdokey_201103221556.txt"));        OutputStreamWriter osw=new OutputStreamWriter(fos, "UTF-8");        BufferedWriter  bw=new BufferedWriter(osw);        //简写如下:        //BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(        //        new FileOutputStream(new File("E:/phsftp/evdokey/evdokey_201103221556.txt")), "UTF-8"));        for(String arr:arrs){            bw.write(arr+"\t\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();    }

 

java一行一行写入或读取数据