java开发_读写txt文件操作
java txt 文件操作
项目结构：
运行效果：
========================================================
下面是代码部分：
========================================================
/Text/src/com/b510/txt/MyFile.java
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 }
以上是 java开发_读写txt文件操作 的全部内容， 来源链接： utcz.com/z/392904.html
