java一行一行写入或读取数据

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(); }

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转载于:https://my.oschina.net/ruanjun/blog/1488948