1、引入jar
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.4</version>
</dependency>
<dependency>
<groupId>com.opencsv</groupId>
<artifactId>opencsv</artifactId>
<version>4.2</version>
</dependency>
2、創建文件:user.txt
內容如下(一般線上的文件,都是嚴格按照規範的)
tiger|M|25|shanghai
hanzi|W|23|beijing
xiaoming|M|18|
xiaohua||12|
例如:xiaohua的性別和地址不詳,字段值都會爲空值,方便後期文件解析以及處理。
3、UserBean
import com.opencsv.bean.CsvBindByPosition;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* Created by Tiger on 2019/1/8.
*/
@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class User {
@CsvBindByPosition(position = 0)
private String name;
@CsvBindByPosition(position = 1)
private String gender;
@CsvBindByPosition(position = 2)
private int age;
@CsvBindByPosition(position = 3)
private String address;
}
這裏使用了@CsvBindByPosition(position = 位置下標),和文件中的字段一一對應。
4、ParseFileToBeanUtils
import com.opencsv.bean.CsvToBeanBuilder;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.List;
/**
* <dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.4</version>
</dependency>
<dependency>
<groupId>com.opencsv</groupId>
<artifactId>opencsv</artifactId>
<version>4.2</version>
</dependency>
* Created by Tiger on 2019/1/8.
*/
public class ParseFileToBeanUtils {
/**
* 解析文件並返回beanList
* @param filePath 文件路徑
* @param beanClass 對應的beanClass
* @param separator 文件中使用的分割符
* @return 返回beanList
* */
public static List<User> parseFileToUserBean(String filePath,Class beanClass,char separator) throws FileNotFoundException {
List<User> users = new CsvToBeanBuilder(new FileReader(filePath))
.withType(beanClass)
.withSeparator(separator)
.build()
.parse();
return users;
}
public static void main(String[] args) throws Exception{
String filePath = "F:/user.txt";
List<User> users = parseFileToUserBean(filePath,User.class,'|');
users.forEach(user ->{
System.out.println(user.toString());
});
}
}
這裏只是舉例,代碼應該更嚴謹一點!
運行結果:
User(name=tiger, gender=M, age=25, address=shanghai)
User(name=hanzi, gender=W, age=23, address=beijing)
User(name=xiaoming, gender=M, age=18, address=)
User(name=xiaohua, gender=, age=12, address=)
之前解析文件,都是在代碼裏一個個set指定,今天同事說使用這個工具包讓代碼更優雅!身邊的人是什麼樣真的很重要,大膽交流,別人知道的你不知道,你知道的別人不知道,一起聊聊,都知道了!