我目前正在阅读三种不同格式的csv文件。下面是正在阅读的每个csv文件的前两行（csv文件中有两行以上只显示文件的格式）以及它们的格式如何不同。
第一档：
FIRST NAME LAST NAME User ID Assignment 1 Assignment 2 Exam 1 Assignment 3 Assignment 4 Paper 1 Exam 2 Assignment 5 Assignment 6 Assignment 7 Paper 2 Final Exam Total Letter grade
Y5w79x8w Zxx5s 329xx5s 91 66 80 97 70 100 95 68 61 71 76 96 81.17 B
第二档
Student Id,Student Name,Potential project feature ideas,Assignment 1,Preliminary Project details,Assignment 2,Project Requirements Specification,Assignment 3,Sprint 1,Midterm exam,Sprint 2,Assignment 4,Sprint 3,Project report,Assignment 5,Final exam,Total,Grade
739s3vr,"Y9s3vr9-Gvrq8, Qvw9r",94,100,89,85,81,100,78,94,91,78,79,92,94,100,89.59,A
第三档
Student Id,Student Name,Potential project feature ideas,Assignment 1,Preliminary Project details,Assignment 2,Project Requirements Specification,Assignment 3,Sprint 1,Midterm exam,Sprint 2,Assignment 4,Sprint 3,Project report,Assignment 5,Final exam,Total,Grade
739s3vr,"Y9s3vr9-Gvrq8, Qvw9r",94,100,89,85,81,100,78,94,91,78,79,92,94,100,89.59,A
第一个文件读取完全没有任何问题，但是当我尝试读取第二个或第三个文件时，它只读取前两行然后停止运行程序而没有任何错误。
以下是我的读者类的代码
package group_project;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.*;
public class CsvReader {
private ArrayList<String> assignmentHeads = new ArrayList<String>();
public List<Student> read(File csvFile) throws IOException {
List<Student> parsedList = new ArrayList<Student>();
List<List<String>> data = new ArrayList<List<String>>();//Holds each row of data
BufferedReader reader = new BufferedReader(new FileReader(csvFile));
String line = null;
int passHeader = 0;
//Reading Each line of the file
while ((line = reader.readLine()) != null) {
String [] temp = line.split(",");//Splitting up the line of read data
List<String> row = new ArrayList<String>();//Allows an undefined num of elements in the row
//Adding the read row of elements to the list of data
row = Arrays.asList(temp);
data.add(row);
if(passHeader == 0) {
assignmentHeads.addAll(parseHeaders(row));
passHeader++;
} else {
parsedList.add(parseData(data, row));
}
}
reader.close();
data.clear();
return parsedList;
}
public List<String> parseHeaders(List<String> row) {
Iterator <String> listRow = row.iterator();
List<String> parsedHeadingRow = new ArrayList<String>();
String hGrade = " ", hId = " ", hName = " ", hTotal = " ";
List<String> assignmentName = new ArrayList<String>();
/**
*Taking data from file and assigning universal headers for easy data manipulation
*/
while (listRow.hasNext()) {
String nextLine = listRow.next();
if (nextLine.toLowerCase().contains("name")) {
String hFName, hLName;
if (nextLine.toLowerCase().equals("student name") || nextLine.toLowerCase().equals("name")) {
hName = nextLine;
parsedHeadingRow.add(hName);
} else if (nextLine.toLowerCase().contains("first")){
hFName = nextLine;
hLName = nextLine;
hName = hFName + hLName;
parsedHeadingRow.add(hName);
} else if (nextLine.toLowerCase().contains("last")) {
hLName = nextLine;
hFName = nextLine;
hName = hFName + hLName;
parsedHeadingRow.add(hName);
}
} else if (nextLine.toLowerCase().contains("id")) {
hId = nextLine;
parsedHeadingRow.add(hId);
} else if(nextLine.toLowerCase().contains("grade")) {
hGrade = nextLine;
parsedHeadingRow.add(hGrade);
} else if(nextLine.toLowerCase().contains("total")) {
hTotal = nextLine;
parsedHeadingRow.add(hTotal);
} else {
assignmentName.add(nextLine);
}
}
return assignmentName;
}
/**
* This method is intended to make sure the data is stored
* to the in the same column as the parsed headers as well as converting
* string values to needed data fields
*/
public Student parseData(List<List<String>> data, List<String> row) {
String name = "", id = " ";
ArrayList<Assignment> assignments = new ArrayList<>();
Student student = null;
double totGrade = 0;
char letGrade = '\0';
Iterator <List<String>> dataIter = data.iterator();//to get the read data
List<String> dataLine = dataIter.next();
Iterator <String> headerRowIter = dataLine.iterator();//to iterate through the headerRow
while (headerRowIter.hasNext()) {
Iterator <String> rowIter = row.iterator();//Iterate through the row being read in csv file
while (rowIter.hasNext()) {
String headerLine = headerRowIter.next();
String line = rowIter.next();
if (headerLine.toLowerCase().contains("name")) {
String fName = " ", lName = " ";
if (headerLine.toLowerCase().equals("student name") || headerLine.toLowerCase().equals("name")) {
name = line;
} else if (headerLine.toLowerCase().contains("first")) {
fName = line;
lName = line;
name = fName + lName;
} else if(headerLine.toLowerCase().contains("last")) {
lName = line;
fName = line;
name = fName + lName;
}
} else if(headerLine.toLowerCase().contains("user")) {
id = line;
} else if (headerLine.toLowerCase().contains("grade")) {
letGrade = line.charAt(0);
} else if (headerLine.toLowerCase().contains("total")) {
totGrade = Double.parseDouble(line);
} else {
Assignment assignment = new Assignment();
int grade = Integer.parseInt(line);
assignment.setGrade(grade);
assignments.add(assignment);
}
}
}
student = new Student(name, id, assignments, totGrade, letGrade);
return student;
}
public ArrayList<String> getAssignmentHeads() {
return assignmentHeads;
}
public ArrayList<String> formatAssignmentHeaders() {
ArrayList<String> projectNames = new ArrayList<>();
for (String str : assignmentHeads) {
String temp = str.toLowerCase();
// checks if it's not an assignment name
if (temp.contains("name") || temp.contains("total") ||
temp.contains("id") || temp.contains("grade")) {
projectNames.add(str);
}
}
return projectNames;
}
}
任何帮助将不胜感激！谢谢！