上传 excel 文件以在 Jtable 上显示后出现参数类型不匹配错误（Eclipse - Java Swing）
Argument type mismatch error after uploading excel file to display on Jtable (Eclipse - Java Swing)
这个项目有三个 .java 文件。 Product.java; ExcelHelper.java; JFrameImpor.java
运行应用程序后，它会要求您导入 excel(.xls) 文件，然后打开一个选项卡，显示 "Argument type mismatch"
Product.java
package entities;
import java.util.*;
public class Product {
private String id;
private String name;
private long price;
private int quatity;
private boolean status;
private Date creationDate;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public long getPrice() {
return price;
}
public void setPrice(long price) {
this.price = price;
}
public int getQuatity() {
return quatity;
}
public void setQuatity(int quatity) {
this.quatity = quatity;
}
public boolean isStatus() {
return status;
}
public void setStatus(boolean status) {
this.status = status;
}
public Date getCreationDate() {
return creationDate;
}
public void setCreationDate(Date creationDate) {
this.creationDate = creationDate;
}
public Product(String id, String name, long price, int quatity, boolean status, Date creationDate) {
super();
this.id = id;
this.name = name;
this.price = price;
this.quatity = quatity;
this.status = status;
this.creationDate = creationDate;
}
public Product() {
super();
}
}
ExcelHelper.java
package helper;
import java.io.*;
import java.lang.reflect.*;
import java.util.*;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.*;
public class ExcelHelper {
public List<String> fieldNames = new ArrayList<String>();
private Workbook workbook = null;
private String workbookName = "";
public ExcelHelper(String workbookName){
this.workbookName = workbookName;
initialize();
}
private void initialize() {
setWorkbook(new HSSFWorkbook());
}
public void closeWorksheet(){
FileOutputStream fileOut;
try{
fileOut = new FileOutputStream(getWorkbookName());
getWorkbook().write(fileOut);
fileOut.close();
}catch(FileNotFoundException e){
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}
}
private boolean setupFieldsForClass(Class<?> clazz) throws Exception{
Field[] fields = clazz.getDeclaredFields();
for(int i=0; i < fields.length ; i++){
fieldNames.add(fields[i].getName());
}
return true;
}
private Sheet getSheetWithName(String name){
Sheet sheet = null;
for(int i=0; i < workbook.getNumberOfSheets() ; i++){
if(name.compareTo(workbook.getSheetName(i)) == 0){
sheet = workbook.getSheetAt(i);
break;
}
}
return sheet;
}
private void initializeForRead() throws InvalidFormatException, IOException{
InputStream inp = new FileInputStream(getWorkbookName());
workbook = WorkbookFactory.create(inp);
}
@SuppressWarnings({"unchecked", "rawtypes"})
public <T> List<T> readData(String classname) throws Exception{
initializeForRead();
Sheet sheet = getSheetWithName(classname);
Class clazz = Class.forName(workbook.getSheetName(0));
setupFieldsForClass(clazz);
List<T> result = new ArrayList<T>();
Row row;
for(int rowCount=1; rowCount<3; rowCount++){
T one = (T) clazz.newInstance();
row = sheet.getRow(rowCount);
int colCount = 0;
result.add(one);
for(Cell cell : row){
CellType type = cell.getCellTypeEnum();
String fieldName = fieldNames.get(colCount++);
Method method = constructMethod(clazz, fieldName);
if(type == CellType.STRING ){
String value = cell.getStringCellValue();
Object[] values = new Object[1];
values[0] = value;
method.invoke(one, values);
} else if(type== CellType.NUMERIC){
Double num = cell.getNumericCellValue();
Class<?>returnType = getGetterReturnClass(clazz, fieldName);
if(returnType == int.class || returnType == Integer.class){
method.invoke(one, num.intValue());
}else if(returnType == double.class || returnType == Double.class){
method.invoke(one, num);
}else if(returnType == float.class || returnType == Float.class){
method.invoke(one, num.floatValue());
}else if(returnType == long.class || returnType == Long.class){
method.invoke(one, num.longValue());
}else if(returnType == Date.class ){
Date date = HSSFDateUtil.getJavaDate(cell.getNumericCellValue());
method.invoke(one, date);
}
}else if (type == CellType.BOOLEAN){
boolean num1 = cell.getBooleanCellValue();
Object[] values = new Object[1];
values[0] = num1;
method.invoke(one, values);
}
}
}
return result;
}
private Class<?> getGetterReturnClass(Class<?> clazz, String fieldName) {
String methodName = "get" + capitalize(fieldName);
String methodIsName = "is" + capitalize(fieldName);
Class<?> returnType = null;
for(Method method : clazz.getMethods()){
if(method.getName().equals(methodName)|| method.getName().equals(methodIsName)){
returnType = method.getReturnType();
break;
}
}
return returnType;
}
@SuppressWarnings({"unchecked", "rawtypes"})
private Method constructMethod(Class clazz, String fieldName) throws SecurityException, NoSuchMethodException {
Class<?> fieldClass = getGetterReturnClass(clazz, fieldName);
return clazz.getMethod("set" + capitalize(fieldName), fieldClass );
}
public <T> void writeData(List<T> data) throws Exception {
try{
Sheet sheet = getWorkbook().createSheet(data.get(0).getClass().getName());
setupFieldsForClass(data.get(0).getClass());
int rowCount = 0;
int columnCount = 0;
Row row = sheet.createRow(rowCount++);
for (String fieldName : fieldNames) {
Cell cel = row.createCell(columnCount++);
cel.setCellValue(fieldName);
}
Class<? extends Object> classz = data.get(0).getClass();
for (T t : data) {
row = sheet.createRow(rowCount++);
columnCount = 0;
for (String fieldName : fieldNames) {
Cell cel = row.createCell(columnCount);
Method method = hasMethod(classz, fieldName)
? classz.getMethod("get"+ capitalize(fieldName))
: classz.getMethod("is"+ capitalize(fieldName));
Object value = method.invoke(t, (Object[]) null);
if (value != null) {
if (value instanceof String) {
cel.setCellValue((String) value);
} else if (value instanceof Long) {
cel.setCellValue((Long) value);
} else if (value instanceof Integer) {
cel.setCellValue((Integer) value);
} else if (value instanceof Double) {
cel.setCellValue((Double) value);
}else if (value instanceof Date){
cel.setCellValue((Date) value);
CellStyle styleDate = workbook.createCellStyle();
DataFormat dataFormatDate = workbook.createDataFormat();
styleDate.setDataFormat(dataFormatDate.getFormat("m/d/yy"));
cel.setCellStyle(styleDate);
}else if (value instanceof Boolean){
cel.setCellValue((Boolean) value);
}
}
columnCount++;
}
}
for(int i=0 ; i< fieldNames.size(); i++)
sheet.autoSizeColumn(i);
FileOutputStream out = new FileOutputStream(new File(workbookName));
workbook.write(out);
out.close();
workbook.close();
}catch (Exception e){
System.out.println("Error:" + e);
}
}
@SuppressWarnings({"unchecked", "rawtypes"})
private boolean hasMethod(Class classz, String fieldName) {
try{
classz.getMethod("get" + capitalize(fieldName));
return true;
} catch (Exception e){
return false;
}
}
public String capitalize(String string) {
String capital = string.substring(0,1).toUpperCase();
return capital + string.substring(1);
}
public String getWorkbookName() {
return workbookName;
}
public void setWorkbookName(String workbookName) {
this.workbookName = workbookName;
}
void setWorkbook(Workbook workbook) {
this.workbook = workbook;
}
public Workbook getWorkbook(){
return workbook;
}
}
JFrameImpor.java
package main;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.table.DefaultTableModel;
import com.ibm.icu.text.SimpleDateFormat;
import entities.Product;
import helper.ExcelHelper;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import java.awt.event.ActionListener;
import java.util.List;
import java.awt.event.ActionEvent;
public class JFrameImpor extends JFrame {
private JPanel contentPane;
private JTable tableProducts;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JFrameImpor frame = new JFrameImpor();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public JFrameImpor() {
setTitle("Import Excel File");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(5, 5, 424, 2);
contentPane.add(scrollPane);
tableProducts = new JTable();
tableProducts.setBounds(20, 11, 393, 174);
contentPane.add(tableProducts);
JButton btnImport = new JButton("Import");
btnImport.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
JFileChooser jf = new JFileChooser();
jf.setDialogTitle("Please select an excel file to import");
int result = jf.showOpenDialog(null);
if(result==JFileChooser.APPROVE_OPTION){
String excelPath = jf.getSelectedFile().getAbsolutePath();
ExcelHelper eh = new ExcelHelper(excelPath);
try{
List<Product> listProduct = eh.readData(Product.class.getName());
DefaultTableModel dtm = new DefaultTableModel();
dtm.addColumn("Id");
dtm.addColumn("Name");
dtm.addColumn("Price");
dtm.addColumn("Quantity");
dtm.addColumn("Status");
dtm.addColumn("Creation Date");
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
for(Product p : listProduct){
dtm.addRow(new Object[] {p.getId(), p.getName(), p.getPrice(), p.getQuatity(), p.isStatus(), sdf.format(p.getCreationDate()) });
}
tableProducts.setModel(dtm);
}catch(Exception e){
JOptionPane.showMessageDialog(null, e.getMessage());
}
//JOptionPane.showMessageDialog(null, excelPath);
}
}
});
btnImport.setBounds(20, 196, 89, 23);
contentPane.add(btnImport);
}
}
它没有显示任何错误，但是当您 运行 应用程序在上传文件后显示参数类型不匹配。
Image 1 description : That is how the window builder of the project looks like.
我发现如果您提供的输入与预期的输入类型不同，程序会抛出 IllegalArgumentException。
示例输入应如下所示：-
id name price quatity status creationDate
1 test 10.51 20 TRUE 2016-05-05
输入类型应与产品 class 的 getter/setter 方法类型完全匹配。
这个项目有三个 .java 文件。 Product.java; ExcelHelper.java; JFrameImpor.java 运行应用程序后，它会要求您导入 excel(.xls) 文件，然后打开一个选项卡，显示 "Argument type mismatch"
Product.java
package entities;
import java.util.*;
public class Product {
private String id;
private String name;
private long price;
private int quatity;
private boolean status;
private Date creationDate;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public long getPrice() {
return price;
}
public void setPrice(long price) {
this.price = price;
}
public int getQuatity() {
return quatity;
}
public void setQuatity(int quatity) {
this.quatity = quatity;
}
public boolean isStatus() {
return status;
}
public void setStatus(boolean status) {
this.status = status;
}
public Date getCreationDate() {
return creationDate;
}
public void setCreationDate(Date creationDate) {
this.creationDate = creationDate;
}
public Product(String id, String name, long price, int quatity, boolean status, Date creationDate) {
super();
this.id = id;
this.name = name;
this.price = price;
this.quatity = quatity;
this.status = status;
this.creationDate = creationDate;
}
public Product() {
super();
}
}
ExcelHelper.java
package helper;
import java.io.*;
import java.lang.reflect.*;
import java.util.*;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.*;
public class ExcelHelper {
public List<String> fieldNames = new ArrayList<String>();
private Workbook workbook = null;
private String workbookName = "";
public ExcelHelper(String workbookName){
this.workbookName = workbookName;
initialize();
}
private void initialize() {
setWorkbook(new HSSFWorkbook());
}
public void closeWorksheet(){
FileOutputStream fileOut;
try{
fileOut = new FileOutputStream(getWorkbookName());
getWorkbook().write(fileOut);
fileOut.close();
}catch(FileNotFoundException e){
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}
}
private boolean setupFieldsForClass(Class<?> clazz) throws Exception{
Field[] fields = clazz.getDeclaredFields();
for(int i=0; i < fields.length ; i++){
fieldNames.add(fields[i].getName());
}
return true;
}
private Sheet getSheetWithName(String name){
Sheet sheet = null;
for(int i=0; i < workbook.getNumberOfSheets() ; i++){
if(name.compareTo(workbook.getSheetName(i)) == 0){
sheet = workbook.getSheetAt(i);
break;
}
}
return sheet;
}
private void initializeForRead() throws InvalidFormatException, IOException{
InputStream inp = new FileInputStream(getWorkbookName());
workbook = WorkbookFactory.create(inp);
}
@SuppressWarnings({"unchecked", "rawtypes"})
public <T> List<T> readData(String classname) throws Exception{
initializeForRead();
Sheet sheet = getSheetWithName(classname);
Class clazz = Class.forName(workbook.getSheetName(0));
setupFieldsForClass(clazz);
List<T> result = new ArrayList<T>();
Row row;
for(int rowCount=1; rowCount<3; rowCount++){
T one = (T) clazz.newInstance();
row = sheet.getRow(rowCount);
int colCount = 0;
result.add(one);
for(Cell cell : row){
CellType type = cell.getCellTypeEnum();
String fieldName = fieldNames.get(colCount++);
Method method = constructMethod(clazz, fieldName);
if(type == CellType.STRING ){
String value = cell.getStringCellValue();
Object[] values = new Object[1];
values[0] = value;
method.invoke(one, values);
} else if(type== CellType.NUMERIC){
Double num = cell.getNumericCellValue();
Class<?>returnType = getGetterReturnClass(clazz, fieldName);
if(returnType == int.class || returnType == Integer.class){
method.invoke(one, num.intValue());
}else if(returnType == double.class || returnType == Double.class){
method.invoke(one, num);
}else if(returnType == float.class || returnType == Float.class){
method.invoke(one, num.floatValue());
}else if(returnType == long.class || returnType == Long.class){
method.invoke(one, num.longValue());
}else if(returnType == Date.class ){
Date date = HSSFDateUtil.getJavaDate(cell.getNumericCellValue());
method.invoke(one, date);
}
}else if (type == CellType.BOOLEAN){
boolean num1 = cell.getBooleanCellValue();
Object[] values = new Object[1];
values[0] = num1;
method.invoke(one, values);
}
}
}
return result;
}
private Class<?> getGetterReturnClass(Class<?> clazz, String fieldName) {
String methodName = "get" + capitalize(fieldName);
String methodIsName = "is" + capitalize(fieldName);
Class<?> returnType = null;
for(Method method : clazz.getMethods()){
if(method.getName().equals(methodName)|| method.getName().equals(methodIsName)){
returnType = method.getReturnType();
break;
}
}
return returnType;
}
@SuppressWarnings({"unchecked", "rawtypes"})
private Method constructMethod(Class clazz, String fieldName) throws SecurityException, NoSuchMethodException {
Class<?> fieldClass = getGetterReturnClass(clazz, fieldName);
return clazz.getMethod("set" + capitalize(fieldName), fieldClass );
}
public <T> void writeData(List<T> data) throws Exception {
try{
Sheet sheet = getWorkbook().createSheet(data.get(0).getClass().getName());
setupFieldsForClass(data.get(0).getClass());
int rowCount = 0;
int columnCount = 0;
Row row = sheet.createRow(rowCount++);
for (String fieldName : fieldNames) {
Cell cel = row.createCell(columnCount++);
cel.setCellValue(fieldName);
}
Class<? extends Object> classz = data.get(0).getClass();
for (T t : data) {
row = sheet.createRow(rowCount++);
columnCount = 0;
for (String fieldName : fieldNames) {
Cell cel = row.createCell(columnCount);
Method method = hasMethod(classz, fieldName)
? classz.getMethod("get"+ capitalize(fieldName))
: classz.getMethod("is"+ capitalize(fieldName));
Object value = method.invoke(t, (Object[]) null);
if (value != null) {
if (value instanceof String) {
cel.setCellValue((String) value);
} else if (value instanceof Long) {
cel.setCellValue((Long) value);
} else if (value instanceof Integer) {
cel.setCellValue((Integer) value);
} else if (value instanceof Double) {
cel.setCellValue((Double) value);
}else if (value instanceof Date){
cel.setCellValue((Date) value);
CellStyle styleDate = workbook.createCellStyle();
DataFormat dataFormatDate = workbook.createDataFormat();
styleDate.setDataFormat(dataFormatDate.getFormat("m/d/yy"));
cel.setCellStyle(styleDate);
}else if (value instanceof Boolean){
cel.setCellValue((Boolean) value);
}
}
columnCount++;
}
}
for(int i=0 ; i< fieldNames.size(); i++)
sheet.autoSizeColumn(i);
FileOutputStream out = new FileOutputStream(new File(workbookName));
workbook.write(out);
out.close();
workbook.close();
}catch (Exception e){
System.out.println("Error:" + e);
}
}
@SuppressWarnings({"unchecked", "rawtypes"})
private boolean hasMethod(Class classz, String fieldName) {
try{
classz.getMethod("get" + capitalize(fieldName));
return true;
} catch (Exception e){
return false;
}
}
public String capitalize(String string) {
String capital = string.substring(0,1).toUpperCase();
return capital + string.substring(1);
}
public String getWorkbookName() {
return workbookName;
}
public void setWorkbookName(String workbookName) {
this.workbookName = workbookName;
}
void setWorkbook(Workbook workbook) {
this.workbook = workbook;
}
public Workbook getWorkbook(){
return workbook;
}
}
JFrameImpor.java
package main;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.table.DefaultTableModel;
import com.ibm.icu.text.SimpleDateFormat;
import entities.Product;
import helper.ExcelHelper;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import java.awt.event.ActionListener;
import java.util.List;
import java.awt.event.ActionEvent;
public class JFrameImpor extends JFrame {
private JPanel contentPane;
private JTable tableProducts;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JFrameImpor frame = new JFrameImpor();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public JFrameImpor() {
setTitle("Import Excel File");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(5, 5, 424, 2);
contentPane.add(scrollPane);
tableProducts = new JTable();
tableProducts.setBounds(20, 11, 393, 174);
contentPane.add(tableProducts);
JButton btnImport = new JButton("Import");
btnImport.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
JFileChooser jf = new JFileChooser();
jf.setDialogTitle("Please select an excel file to import");
int result = jf.showOpenDialog(null);
if(result==JFileChooser.APPROVE_OPTION){
String excelPath = jf.getSelectedFile().getAbsolutePath();
ExcelHelper eh = new ExcelHelper(excelPath);
try{
List<Product> listProduct = eh.readData(Product.class.getName());
DefaultTableModel dtm = new DefaultTableModel();
dtm.addColumn("Id");
dtm.addColumn("Name");
dtm.addColumn("Price");
dtm.addColumn("Quantity");
dtm.addColumn("Status");
dtm.addColumn("Creation Date");
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
for(Product p : listProduct){
dtm.addRow(new Object[] {p.getId(), p.getName(), p.getPrice(), p.getQuatity(), p.isStatus(), sdf.format(p.getCreationDate()) });
}
tableProducts.setModel(dtm);
}catch(Exception e){
JOptionPane.showMessageDialog(null, e.getMessage());
}
//JOptionPane.showMessageDialog(null, excelPath);
}
}
});
btnImport.setBounds(20, 196, 89, 23);
contentPane.add(btnImport);
}
}
它没有显示任何错误，但是当您 运行 应用程序在上传文件后显示参数类型不匹配。
Image 1 description : That is how the window builder of the project looks like.
我发现如果您提供的输入与预期的输入类型不同，程序会抛出 IllegalArgumentException。 示例输入应如下所示：-
id name price quatity status creationDate
1 test 10.51 20 TRUE 2016-05-05
输入类型应与产品 class 的 getter/setter 方法类型完全匹配。