首页 > 代码库 > java一行一行写入或读取数据
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
声明:以上内容来自用户投稿及互联网公开渠道收集整理发布,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任,若内容有误或涉及侵权可进行投诉: 投诉/举报 工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。