当我尝试读取csv时,我收到此错误消息:
Exception in thread "main" java.lang.IllegalStateException: No header mapping was specified, the record values can't be accessed by name
at org.apache.commons.csv.CSVRecord.get(CSVRecord.java:99)
at mockdata.MockData.main(MockData.java:33)
Java 结果:1
我正在使用Apache Commons CSV库1.1。尝试在谷歌上搜索错误消息,我唯一得到的是 grepcode 等网站上的代码列表。
这是我的代码:
package mockdata;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVRecord;
public class MockData
{
/**
* @param args the command line arguments
*/
public static void main(String[] args) throws FileNotFoundException, IOException
{
Reader in = new InputStreamReader(MockData.class.getClassLoader()
.getResourceAsStream("MOCK_DATA.csv"), "UTF-8");
Iterable<CSVRecord> records = CSVFormat.EXCEL.parse(in);
for (CSVRecord record : records)
{
String lastName = record.get("last_name");
String firstName = record.get("first_name");
System.out.println("firstName: " + firstName + " lastName: " + lastName);
}
}
}
CSV的内容:
first_name,last_name,address1,city,state,zip,country,phone,email
Robin,Lee,668 Kinsman Road,Hagerstown,TX,94913,United States,5-(078)623-0713,rlee0@e-recht24.de
Bobby,Moreno,68 Dorton Avenue,Reno,AZ,79934,United States,5-(080)410-6743,bmoreno1@ihg.com
Eugene,Alexander,3 Bunker Hill Court,Newark,MS,30066,United States,5-(822)147-6867,ealexander2@gmpg.org
Katherine,Crawford,3557 Caliangt Avenue,New Orleans,OR,23289,United States,2-(686)178-7222,kcrawford3@symantec.com
它位于我的 src 文件夹中。
调用 withHeader() 到默认的 Excel CSV 格式对我有用:
CSVFormat.EXCEL.withHeader().parse(in);
文档中的示例不是很清楚,但您可以在此处找到它:安全地引用列:如果您的源包含标头记录,则可以通过使用不带参数的 withHeader(String...) 来简化代码并安全地引用列: CSVFormat.EXCEL.withHeader();
我有用
try (Reader in = new FileReader(f);
CSVParser parser = new CSVParser(in,
CSVFormat.EXCEL.withDelimiter(';').withHeader("Assembly Item Number", "Material Type", "Item Name", "Drawing Num", "Document Type", "Revision", "Status", "Drawing name",
"BOM Material Type", "Component Name"));) {
for (CSVRecord record : parser) {
System.out.println(record.get("Item Name"));
}
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
在 1.9.0 版本中,withHeader()
现已弃用,指南尚未更新。你应该使用这个模式:CSVFormat.RFC4180.builder().setHeader("a","b","c").build().parse(in)
<</p>
我设法使用以下代码忽略了标头名称中的空格(介于两者之间) - 通过使用 get(index) 而不是 get("header_name")。此外,当检测到空白值/行时,停止读取 csv:
CSVParser csvParser = CSVFormat.EXCEL.withFirstRecordAsHeader().parse(br);
for (CSVRecord record : csvParser) {
String number= record.get(0);
String date = record.get("date");
String location = record.get("Location");
String lsFile = record.get(3);
String docName = record.get(4);
if(StringUtils.isEmpty(lsFile)) {
break;
}
}
查看此URL中每种格式的定义定义文件格式试试这个:
File f = new File("your path file ");
Reader readfile = new FileReader(f);
Iterable<CSVRecord> records = CSVFormat.DEFAULT.withDelimiter(';').withHeader().parse(readfile);