实用技巧（3）：Java按一行一行进行文件的读取或写入

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/**     * 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();    }
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