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私はボランティアプロジェクト用のExcel-to-JSONコンバータを作成しようとしていましたが、修正を拒否する説明できないエラーが続いています。私はそれが離れて行くために得ることができないHSSFCellでヌルエラーが読み取られましたか？
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at bin.parse.MembersParser.tryString(MembersParser.java:112)
at bin.parse.MembersParser.parseFile(MembersParser.java:53)
at bin.ParserFrame.actionPerformed(ParserFrame.java:61)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
、私はここにソースだと多分他の誰かが私が間違ってやっているものを私に伝えることができるようになり、作るどのように多くの変更は問題ではありませ：ここに私のエラーです。
bin.Main：
package bin;
import javax.swing.JFrame;
public class Main {
static ParserFrame f;
public static void main(String[] args) {
f = new ParserFrame();
f.add(f.panel);
f.setSize(800, 200);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
}
bin.ParserFrame:
package bin;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import javax.swing.*;
import bin.parse.*;
@SuppressWarnings("serial")
public class ParserFrame extends JFrame implements ActionListener {
private JButton parse;
private JLabel desc, inpt, oupt;
private JTextField input, output;
final JComboBox<String> menu;
final int FIELDS_WIDTHS = 35;
String[] CHOICES = {"Members", "MembersDues", "MembersLevel", "MembersAddresses", "MembersContact"};
private Parser p;
public JPanel panel = new JPanel();
public ParserFrame() {
desc = new JLabel("Select type of format to parse: ");
menu = new JComboBox<String>(CHOICES);
menu.setVisible(true);
inpt = new JLabel("Select input source .xls file: ");
input = new JTextField(FIELDS_WIDTHS);
oupt = new JLabel("Select output location (end with .txt extension): ");
output = new JTextField(FIELDS_WIDTHS);
parse = new JButton("Parse the file.");
parse.addActionListener(this);
panel.setLayout(new GridLayout(4, 2));
panel.add(desc);
panel.add(menu);
panel.add(inpt);
panel.add(input);
panel.add(oupt);
panel.add(output);
panel.add(parse);
}
private void createButton() {
parse = new JButton("Parse File");
parse.addActionListener(this);
}
@Override
public void actionPerformed(ActionEvent e) {
p = selectParser((String) menu.getSelectedItem());
String outputJSON = p.parseFile(input.getText());
try(PrintWriter out = new PrintWriter(output.getText())){
out.println(outputJSON);
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
}
private Parser selectParser(String selection) {
switch (selection) {
case "Members": return new MembersParser();
}
return null;
}
}
bin.parse.MembersParser：
package bin.parse;
import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.CellType;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import bin.format.Members;
public class MembersParser implements Parser {
Gson g;
List<Members> j = new ArrayList<Members>();
Members m = new Members();
HSSFWorkbook w = null;
HSSFRow r = null;
HSSFCell c = null;
public MembersParser() {
g = new GsonBuilder().setPrettyPrinting().setDateFormat("yyyy-MM-dd'T'HH:mm:ssz").create();
}
public String parseFile(String inputLocation) {
try {
w = Parser.readFile(inputLocation);
} catch (IOException e) {
e.printStackTrace();
}
HSSFSheet s = w.getSheetAt(0);
for(int i = 1; i < s.getPhysicalNumberOfRows(); i++) {
r = s.getRow(i);
c = r.getCell(0);
m.id = tryNumber(c);
c = r.getCell(1);
m.firstName = tryString(c);
c = r.getCell(2);
m.lastName = tryString(c);
c = r.getCell(3);
m.title = tryString(c);
c = r.getCell(4);
m.suffix = tryString(c);
c = r.getCell(5);
m.nickname = tryString(c);
c = r.getCell(6);
m.fullName = tryString(c);
c = r.getCell(7);
m.chapterName = tryString(c);
c = r.getCell(8);
m.gender = tryString(c);
c = r.getCell(9);
m.ageGroup = tryString(c);
c = r.getCell(10);
m.unit = tryNumber(c);
c = r.getCell(11);
m.level = tryString(c);
c = r.getCell(12);
m.levelDate = getDate(c);
c = r.getCell(13);
m.currentPosition = tryString(c);
c = r.getCell(14);
m.youthProtectionDate = getDate(c);
j.add(m);
}
return g.toJson(m);
}
private String getString(HSSFCell c) {
try {
return c.getStringCellValue();
} catch (NullPointerException e) {
e.printStackTrace();
}
return "";
}
private int getNumber(HSSFCell c) {
try {
return (int) c.getNumericCellValue();
} catch (NullPointerException e) {
e.printStackTrace();
}
return 0;
}
private Date getDate(HSSFCell c) {
try {
return c.getDateCellValue();
} catch (NullPointerException e) {
e.printStackTrace();
}
return null;
}
private String tryString(HSSFCell c) {
if(c.getCellTypeEnum() == CellType.STRING) {
return getString(c);
} else if (c.getCellTypeEnum() == CellType.NUMERIC) {
return String.valueOf(getNumber(c));
} else {
return "";
}
}
private int tryNumber(HSSFCell c) {
if(c.getCellTypeEnum() == CellType.NUMERIC) {
return getNumber(c);
} else if (c.getCellTypeEnum() == CellType.STRING) {
return Integer.valueOf(getString(c));
} else {
return 0;
}
}
}
注：パーサの親が現在readFileの（以外の機能は何の多くを持っていません）
bin.format.Members：
package bin.format;
import java.util.Date;
/**
* Holds the data from the Excel sheet and formats it for the JSON output.
*
* @version 1
*/
public class Members {
public int id;
public String firstName;
public String lastName;
public String title;
public String suffix;
public String nickname;
public String fullName;
public String chapterName;
public String gender;
public String ageGroup;
public int unit;
public String level;
public Date levelDate;
public String currentPosition;
public Date youthProtectionDate;
}