Java使用IO流读取TXT文件

通过BufferedReader读取TXT文件
window系统默认的编码是GBK，而IDE的编码多数为UTF-8，如果没有规定new InputStreamReader(new FileInputStream(file),“GBK”)为GBK会出现读取内容乱码。

//文件路径
String filePath="C:/Users/Admin/Desktop/products.txt";
File file=new File(filePath);
BufferedReader reader = null;
String tempString = null;
int line =1;
try {
// System.out.println("以行为单位读取文件内容，一次读一整行：");
reader = new BufferedReader(new InputStreamReader(new FileInputStream(file),"GBK"));
while ((tempString = reader.readLine()) != null) {
System.out.println("Line"+ line + ":" +tempString)；
line ++ ;
}
reader.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
if(reader != null){
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
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读取TXT文件并保持在List集合
TXT文件内容
商品 价格 类型 数量

创建Product对象

public class Product{
private int id;
private String name;
private int price;
private char type;
private int count;
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//将txt文件中的产品对象读取出来并且封装成集合对象
private static List<Product> getProductFromTxt(){
List<Product> list=new ArrayList<>();
String filePath="C:/Users/Admin/Desktop/products.txt";
File file=new File(filePath);
BufferedReader reader = null;
String content = null;
int line =1;
try {
// System.out.println("以行为单位读取文件内容，一次读一整行：");
reader = new BufferedReader(new InputStreamReader(new FileInputStream(file),"GBK"));
while ((content = reader.readLine()) != null) {
//System.out.println("Line"+ line + ":" +tempString);
String[] arra=content.split(",");
Product product=new Product();
product.setId(line);
product.setName(arra[0]);
product.setPrice(Integer.parseInt(arra[1]));
char[] ch=arra[2].toCharArray();
product.setType(ch[0]);
product.setCount(Integer.parseInt(arra[3]));
list.add(product);
line ++ ;
}
reader.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(reader != null){
try {
reader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return list;
}
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其中包含了String转char

char[] ch=str.toCharArray();
product.setType(ch[0]);
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版权声明：本文为CSDN博主「IManiy」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/IManiy/article/details/83834360