java如何在读取csv文件时跳过重复的行?
我需要跳过csv文件中的重复项,并需要将原始值插入我的数据库。 这是我的密码
public class Json {
public List<User> jsonConvert()
throws JsonGenerationException, JsonMappingException, IOException {
File input = new File("C:\\Users\\SwedhaS\\Documents\\SametimeFileTransfers\\newPIRs.csv");
Pattern pattern = Pattern.compile(",");
try (BufferedReader in = new BufferedReader(new FileReader(input));) {
List<User> users = in
.lines()
.skip(1)
.<User>map(line -> {
String[]x = new String[6];
x = pattern.split(line);
return new User(x);
}).collect(Collectors.toList());
ObjectMapper mapper = new ObjectMapper();
mapper.enable(SerializationFeature.INDENT_OUTPUT);
mapper.writeValue(System.out, users);
return users;
}
}
}
# 1 楼答案
我相信你是想从
users
列表中删除重复项,对吗为此,如果还想保留顺序,可以使用哈希集,它会自动删除重复项: