java开发_读写txt文件操作

  1 package com.b510.txt;
  2 
  3 import java.io.BufferedReader;
  4 import java.io.File;
  5 import java.io.FileInputStream;
  6 import java.io.FileNotFoundException;
  7 import java.io.FileOutputStream;
  8 import java.io.FileReader;
  9 import java.io.IOException;
 10 import java.io.InputStreamReader;
 11 import java.io.PrintWriter;
 12 
 13 /**
 14  * @author Hongten
 15  * 
 16  * @time 2011-12-12 2011
 17  */
 18 public class MyFile {
 19     @SuppressWarnings("static-access")
 20     public static void main(String[] args) {
 21         MyFile myFile = new MyFile();
 22         try {
 23             for (int i = 0; i < 5; i++) {
 24                 myFile.creatTxtFile("test");
 25                 myFile.writeTxtFile("显示的是追加的信息" + i);
 26                 String str = myFile.readDate();
 27                 System.out.println("*********\n" + str);
 28             }
 29         } catch (IOException e) {
 30             // TODO Auto-generated catch block
 31             e.printStackTrace();
 32         }
 33     }
 34 
 35     private static String path = "txt/";
 36     private static String filenameTemp;
 37 
 38     /**
 39      * 创建文件
 40      * 
 41      * @throws IOException
 42      */
 43     public static boolean creatTxtFile(String name) throws IOException {
 44         boolean flag = false;
 45         filenameTemp = path + name + ".txt";
 46         File filename = new File(filenameTemp);
 47         if (!filename.exists()) {
 48             filename.createNewFile();
 49             flag = true;
 50         }
 51         return flag;
 52     }
 53 
 54     /**
 55      * 写文件
 56      * 
 57      * @param newStr
 58      *            新内容
 59      * @throws IOException
 60      */
 61     public static boolean writeTxtFile(String newStr) throws IOException {
 62         // 先读取原有文件内容，然后进行写入操作
 63         boolean flag = false;
 64         String filein = newStr + "\r\n";
 65         String temp = "";
 66 
 67         FileInputStream fis = null;
 68         InputStreamReader isr = null;
 69         BufferedReader br = null;
 70 
 71         FileOutputStream fos = null;
 72         PrintWriter pw = null;
 73         try {
 74             // 文件路径
 75             File file = new File(filenameTemp);
 76             // 将文件读入输入流
 77             fis = new FileInputStream(file);
 78             isr = new InputStreamReader(fis);
 79             br = new BufferedReader(isr);
 80             StringBuffer buf = new StringBuffer();
 81 
 82             // 保存该文件原有的内容
 83             for (int j = 1; (temp = br.readLine()) != null; j++) {
 84                 buf = buf.append(temp);
 85                 // System.getProperty("line.separator")
 86                 // 行与行之间的分隔符 相当于“\n”
 87                 buf = buf.append(System.getProperty("line.separator"));
 88             }
 89             buf.append(filein);
 90 
 91             fos = new FileOutputStream(file);
 92             pw = new PrintWriter(fos);
 93             pw.write(buf.toString().toCharArray());
 94             pw.flush();
 95             flag = true;
 96         } catch (IOException e1) {
 97             // TODO 自动生成 catch 块
 98             throw e1;
 99         } finally {
100             if (pw != null) {
101                 pw.close();
102             }
103             if (fos != null) {
104                 fos.close();
105             }
106             if (br != null) {
107                 br.close();
108             }
109             if (isr != null) {
110                 isr.close();
111             }
112             if (fis != null) {
113                 fis.close();
114             }
115         }
116         return flag;
117     }
118 
119     /**
120      * 读取数据
121      */
122     public void readData1() {
123         try {
124             FileReader read = new FileReader(filenameTemp);
125             BufferedReader br = new BufferedReader(read);
126             String row;
127             while ((row = br.readLine()) != null) {
128                 System.out.println(row);
129             }
130         } catch (FileNotFoundException e) {
131             e.printStackTrace();
132         } catch (IOException e) {
133             e.printStackTrace();
134         }
135     }
136 
137     public String readDate() {
138         // 定义一个待返回的空字符串
139         String strs = "";
140         try {
141             FileReader read = new FileReader(new File(filenameTemp));
142             StringBuffer sb = new StringBuffer();
143             char ch[] = new char[1024];
144             int d = read.read(ch);
145             while (d != -1) {
146                 String str = new String(ch, 0, d);
147                 sb.append(str);
148                 d = read.read(ch);
149             }
150             System.out.print(sb.toString());
151             String a = sb.toString().replaceAll("@@@@@", ",");
152             strs = a.substring(0, a.length() - 1);
153         } catch (FileNotFoundException e) {
154             e.printStackTrace();
155         } catch (IOException e) {
156             e.printStackTrace();
157         }
158         return strs;
159     }
160 }