在eclipse中使用java.io库，因此FileInputStream可以读取一个dat文件 [英] Using java.io library in eclipse so FileInputStream can read a dat file
问题描述
- 目标：使用Eclipse将数据从.dat文件打印到控制台。
- （长期目标）：可执行文件，我可以传递一个.dat文件，并创建一个新的txt文件数据格式化。
.dat 我知道.dat文件包含使用ECMAScript创建图形所需的控制点。
Eclipse安装程序：
-
创建Java项目
-
新建>类..称为类 FileRead
li>
现在我有FileRead.java，它是：
1 / package frp;
2 /
3 / import java.io.BufferedReader;
4 / import java.io.File;
5 / import java.io.FileReader;
6 /
7 / public class FileRead {
8 /
9 / public static void main（String [] args）{
10 / FileReader file = new FileReader （新文件（dichromatic.dat））;
11 / BufferedReader br = new BufferedReader（file）;
12 / String temp = br.readLine（）;
13 / while（temp！= null）{
14 / temp = br.readLine（）;
15 / System.out.println（temp）;
16 /}
17 / file.close（）;
18 /}
19 /
20 /}
请注意，这种方式是从这里借来的： LINES 12，14，17
QUESTION ：如何防止这些异常？
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/ strong>不更改代码，您必须将文件放在项目的根文件夹中。
否则，将其引用为 src / frp / dichromatic.dat
2. 执行以下操作：
public static void main（String [] args）{
FileReader file =空值;
try {
file = new FileReader（new File（dichromatic.dat））;
} catch（FileNotFoundException e1）{
System.err.println（File dichromatic.dat not found！）;
e1.printStackTrace（）;
}
BufferedReader br = new BufferedReader（file）;
字符串;
尝试{
while（（line = br.readLine（））！= null）{
System.out.println（line）;
}
} catch（IOException e）{
System.err.println（读取时出错）;
e.printStackTrace（）;
} finally {
if（br！= null）{
try {
br.close（）;
} catch（IOException e）{
System.err.println（Unexpected error）;
e.printStackTrace（）;
}
}
}
}
strong> 3。创建一个新的txt文件格式化。在这个例子中，格式化将字符设置为大写。
public static void main（String [] args）{
FileReader file = null;
BufferedWriter bw = null;
文件outputFile = new File（output.formatted）;
try {
file = new FileReader（new File（dichromatic.dat））;
} catch（FileNotFoundException e1）{
System.err.println（File dichromatic.dat not found！）;
e1.printStackTrace（）;
}
try {
bw = new BufferedWriter（new FileWriter（outputFile））;
} catch（IOException e1）{
System.err.println（File is not writtable or not a file）;
e1.printStackTrace（）;
}
BufferedReader br = new BufferedReader（file）;
字符串;
字符串线形格式;
尝试{
while（（line = br.readLine（））！= null）{
lineformatted = format（line）;
bw.write（lineformatted）;
//如果你需要它
bw.newLine（）;
}
} catch（IOException e）{
System.err.println（处理文件时出错！）;
e.printStackTrace（）;
} finally {
if（br！= null）{
try {
br.close（）;
} catch（IOException e）{
System.err.println（Unexpected error）;
e.printStackTrace（）;
}
}
if（bw！= null）{
try {
bw.close（）;
} catch（IOException e）{
System.err.println（Unexpected error）;
e.printStackTrace（）;
}
}
}
}
public static String format（String line）{
//将此替换为您的需要
return line.toUpperCase（）;
}
- Goal: Print the data from a .dat file to the console using Eclipse.
- (Long-Term Goal): Executable that I can pass a .dat file to and it creates a new txt file with the data formatted.
The .dat: I know the .dat file contains control points that I will need to create a graph with using ECMAScript.
Eclipse Setup:
Created Java Project
New > Class .. called the Class FileRead
Now I have FileRead.java which is:
1/ package frp;
2/
3/ import java.io.BufferedReader;
4/ import java.io.File;
5/ import java.io.FileReader;
6/
7/ public class FileRead {
8/
9/ public static void main(String[] args) {
10/ FileReader file = new FileReader(new File("dichromatic.dat"));
11/ BufferedReader br = new BufferedReader(file);
12/ String temp = br.readLine();
13/ while (temp != null) {
14/ temp = br.readLine();
15/ System.out.println(temp);
16/ }
17/ file.close();
18/ }
19/
20/ }
Please note this approach was borrowed from here: https://stackoverflow.com/a/18979213/3306651
1st Challenge: FileNotFoundException on LINE 10
Screenshot of Project Explorer:
QUESTION: How to correctly reference the .dat file?
2nd Challenge: Unhandled exception type IOException LINES 12, 14, 17
QUESTION: How to prevent these exceptions?
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1. Without changing your code, you must place the file in the project's root folder.
Otherwise, reference it as src/frp/dichromatic.dat
2. Doing something like this:
public static void main(String[] args) {
FileReader file = null;
try {
file = new FileReader(new File("dichromatic.dat"));
} catch (FileNotFoundException e1) {
System.err.println("File dichromatic.dat not found!");
e1.printStackTrace();
}
BufferedReader br = new BufferedReader(file);
String line;
try {
while ((line = br.readLine()) != null) {
System.out.println(line);
}
} catch (IOException e) {
System.err.println("Error when reading");
e.printStackTrace();
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
System.err.println("Unexpected error");
e.printStackTrace();
}
}
}
}
3. Creation of a new txt file "formatted". In this example, the formatting will be settings the characters to uppercase.
public static void main(String[] args) {
FileReader file = null;
BufferedWriter bw = null;
File outputFile = new File("output.formatted");
try {
file = new FileReader(new File("dichromatic.dat"));
} catch (FileNotFoundException e1) {
System.err.println("File dichromatic.dat not found!");
e1.printStackTrace();
}
try {
bw = new BufferedWriter(new FileWriter(outputFile));
} catch (IOException e1) {
System.err.println("File is not writtable or is not a file");
e1.printStackTrace();
}
BufferedReader br = new BufferedReader(file);
String line;
String lineformatted;
try {
while ((line = br.readLine()) != null) {
lineformatted = format(line);
bw.write(lineformatted);
// if you need it
bw.newLine();
}
} catch (IOException e) {
System.err.println("Error when processing the file!");
e.printStackTrace();
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
System.err.println("Unexpected error");
e.printStackTrace();
}
}
if (bw != null) {
try {
bw.close();
} catch (IOException e) {
System.err.println("Unexpected error");
e.printStackTrace();
}
}
}
}
public static String format(String line) {
// replace this with your needs
return line.toUpperCase();
}
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