JAVA实现对Excel的操作
操作环境：Eclipse Luna+win7
之前写了一篇用mfc做的对于Excel的操作。其实在此之前，首先是用java来操作的Excel. 这一点在那篇博文里也有提到，仍然是说，java对于Excel的操作更为方便，很大一部分的原因在于java的数据类型之间的转换逻辑比较简单。
这里做的是一个钢铁实验的处理工具，下面上干货。
1. 记得导入jxl.jar
2. 效果图
3.工程结构很简单，只是需要一个java文件，然后界面的实现和业务的逻辑处理都放在了一个里面。
整个工程实现的是用文件选择器选择一个文件，然后读取Excel，对数据做处理，然后生成一个Excel保存结果。
4.下面讲具体的实现。
(1)创建工程什么的就不说了，一个包，然后创建一个方法。
(2)上代码了，貌似挺简单的，就不做讲解了。
class GetData implements ActionListener{
String pathtrans;
String [][] cData;
JTextField PathText;
JTextField text1, text2, text3, text4, text5, text6;
JButton Op, ImportFiles, ExportFiles;
JFileChooser filechooser=new JFileChooser();
JFrame frame=new JFrame("Steel Experimental Data Calculation Tool");
//构造页面
public void makeUI(){
JPanel p1=new JPanel();
p1.setLayout(new FlowLayout());
JPanel p2=new JPanel();
p2.setLayout(new FlowLayout(FlowLayout.CENTER));
//p1添加元素
PathText=new JTextField(35);
p1.add(PathText);
Op=new JButton("打开文件");
p1.add(Op);
Op.addActionListener(this);
frame.add(p1,"North");
//p2添加元素
JLabel label1 = new JLabel("点位差：");
text1 = new JTextField("0.004",5);
JLabel label2 = new JLabel("a-N曲线K值：");
text2 = new JTextField(5);
JLabel label3 = new JLabel("△P：");
text3 = new JTextField(5);
JLabel label4 = new JLabel("B:");
text4 = new JTextField(5);
JLabel label5 = new JLabel("W:");
text5 = new JTextField(5);
JLabel label6 = new JLabel("点数n:");
text6 = new JTextField(5);
ImportFiles=new JButton("导入");
ExportFiles=new JButton("导出");
p2.add(label1);
p2.add(text1);
p2.add(label2);
p2.add(text2);
p2.add(label3);
p2.add(text3);
p2.add(label4);
p2.add(text4);
p2.add(label5);
p2.add(text5);
p2.add(label6);
p2.add(text6);
p2.add(ImportFiles);
p2.add(ExportFiles);
ImportFiles.setBounds(100, 60, 90, 25);
ExportFiles.setBounds(310, 60, 90, 25);
ImportFiles.addActionListener(this);
ExportFiles.addActionListener(this);
frame.add(p2,"Center");
frame.setBounds(100,100,800,400);
frame.setVisible(true);
}
public GetData(){
filechooser.setCurrentDirectory(new File("d://"));
double lx=Toolkit.getDefaultToolkit().getScreenSize().getWidth();
double ly=Toolkit.getDefaultToolkit().getScreenSize().getHeight();
frame.setLocation(new Point((int)(lx/2)-150,(int)(ly/2)-150));
frame.setSize(280, 200);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==Op)
{
//choose a path
filechooser.setFileSelectionMode(0);
int state=filechooser.showOpenDialog(null);
if(state==1)
return;
else{
File f=filechooser.getSelectedFile();
PathText.setText(f.getAbsolutePath());
pathtrans=f.getAbsolutePath();
}
}
else if(e.getSource()==ImportFiles)
{
//Import
String [][] result =ReadData();
String a = text1.getText().toString();
double aFlt = Double.valueOf(a).doubleValue();
if(result !=null){
cData = DealData1(result, aFlt);
CreateData1(cData);
}
}
else if(e.getSource()==ExportFiles)
{
//Export
double kFlt = Double.valueOf(text2.getText().toString()).doubleValue();
int nFlt = Integer.valueOf(text6.getText().toString()).intValue();
String [][] res1 = DealData2(cData, kFlt);
double [][] res2 = getXI(res1, nFlt);
int mNum = res2.length;
double [] x = new double[mNum];
double[] mC1 = new double[mNum];
double [] mC2 = new double[mNum];
for(int i=0;i<mNum;i++){
x[i] = res2[i][0];
mC1[i] = res2[i][1];
mC2[i] = res2[i][2];
}
double [] res3 = getParam(res1, x);
double [][] res4 = getResult(res3, mC1, mC2, res1);
int num = res4.length;
int kk=0;
for(int j=0;j<num;j++){
if(res4[j][0]!=0 && res4[j][1]!=0){
kk++;
}
}
String [][]res5 = new String [kk][2];
for(int i=0;i<kk;i++){
res5[i][0] = res4[i][0]+"";
res5[i][1] = res4[i][1]+"";
}
CreateData2(res5);
}
}
//读取数据
public String[][] ReadData(){
String [][] result = null;
try{
jxl.Workbook readwb = null;
InputStream instream = new FileInputStream(pathtrans);
readwb = Workbook.getWorkbook(instream);
Sheet readsheet = readwb.getSheet(0);
int rsColumns = readsheet.getColumns(); //列数
int rsRows = readsheet.getRows(); //行数
result = new String [rsRows][rsColumns];
for(int i=0;i<rsRows;i++){
for(int j=0;j<rsColumns;j++){
Cell mCell = readsheet.getCell(j,i);
String cellStr = mCell.getContents().toString();
result[i][j] = cellStr;
}
}
}catch(Exception e){
JOptionPane.showMessageDialog(null, "Read Data Exception !","Warning", JOptionPane.ERROR_MESSAGE);
}
return result;
}
//处理数据1
public String [][] DealData1(String data[][], double aInp){
int colNum = data.length;
double [][] mData = new double[colNum][2];
String [][] result = new String [colNum][2];
for(int i=0;i<data.length;i++){ //数据类型转换
for(int j=0;j<data[i].length;j++){
double cellInteger = Double.valueOf(data[i][j]).doubleValue();
mData[i][j] = cellInteger;
}
}
if(mData!=null){ //按点位差进行数据刷选
result[0][0] = mData[0][0]+"";
result[0][1] = mData[0][1]+"";
int nNum = 1;
double rNum = mData[0][1];
for(int k=1;k<colNum;k++){
double aRes = mData[k][1]-rNum;
if(aRes>=aInp){
result[nNum][0] = mData[k][0]+"";
result[nNum][1] = mData[k][1]+"";
rNum = mData[k][1];
++nNum;
}
}
}
return result;
}
//生成表格1
public boolean CreateData1(String [][] res){
boolean flag = true;
try{
double mRes = 0.00;
File fileWriter = new File("D:/","ResultData1.xls");
if(!fileWriter.exists()){
fileWriter.createNewFile();
}
OutputStream os = new FileOutputStream(fileWriter);
WritableWorkbook wwb = Workbook.createWorkbook(os);
WritableSheet ws = wwb.createSheet("Result Data1", 0);
WritableCellFormat wcf = new WritableCellFormat();
wcf.setAlignment(Alignment.CENTRE);
for(int i=0;i<res.length;i++){
for(int j=0;j<res[i].length;j++){
if(res[i][j]!=null){
mRes = Double.valueOf(res[i][j]).doubleValue();
jxl.write.Number number = new jxl.write.Number(j,i,mRes);
ws.addCell(number);
}
}
}
wwb.write();
wwb.close();
}catch(Exception e){
flag = false;
JOptionPane.showMessageDialog(null, "Create Excel Exception !","Warning", JOptionPane.ERROR_MESSAGE);
}
return flag;
}
//处理数据2
public String [][] DealData2(String data[][], double kInp){
int num = data.length;
int knum = num;
int k = 0;
double v0 = Double.valueOf(data[2][1]).doubleValue();
if(num%2==0){
knum = num/2 -1;
}else{
knum = num/2;
}
String [][] result = new String [knum][2];
System.out.println(data[2][0]);
for(int i=2;i<num;i++){
result[k][0] = data[i][0];
double vi = Double.valueOf(data[i][1]).doubleValue();
result[k][1] = 10+(vi-v0)*kInp+"";
++i;
++k;
}
return result;
}
//数据处理3
public double [][] getXI(String data[][], int n){
int num = data.length;
double [][] x = new double [num][3] ;
for(int i=n;(i+n)<num;i++){
if(data[i-n][0]!=null && data[i+n][0]!=null){
double N1 = Double.valueOf(data[i-n][0]).doubleValue();
double N2 = Double.valueOf(data[i+n][0]).doubleValue();
double c1 = (N1+N2)/2;
double c2 = (N2-N1)/2;
x[i-n][1] = c1;
x[i-n][2] = c2;
x[i-n][0] = (Double.valueOf(data[i][0]).doubleValue()-c1)/c2;
}
}
return x;
}
//最小二乘法获取回归曲线拟合的参数
public double [] getParam(String data[][], double x[]){
int num = data.length;
double[] mPa;
double [][] mY = new double[num][2];
for(int i=0;i<num;i++){
if(data[i][1] !=null){
mY[i][0] = Double.valueOf(data[i][1]).doubleValue();
}
}
double[][] mX = new double [num][3];
for(int j=0;j<num;j++){
mX[j][0] = 1.00;
mX[j][1] = Double.valueOf(x[j]).doubleValue();
mX[j][2] = Double.valueOf(x[j]*x[j]).doubleValue();
}
Matrix nX = new Matrix(mX);
Matrix nY = new Matrix(mY);
Matrix nXP = nX.transpose();
Matrix nB = nXP.times(nX).inverse().times(nXP).times(nY);
mPa = nB.getColumnPackedCopy();
return mPa;
}
//获得拟合长度a
public double [][] getResult(double []param, double []c1, double []c2, String [][]aN){
double b0 = param[0];
double b1 = param[1];
double b2 = param[2];
int num = aN.length;
double p = Double.valueOf(text3.getText().toString()).doubleValue();
double B = Double.valueOf(text4.getText().toString()).doubleValue();
double W = Double.valueOf(text5.getText().toString()).doubleValue();
double [][] result = new double[num][2];
for(int i=0;i<num;i++){
if(c1[i]!=0 && c2[i]!=0){
double a = Double.valueOf(aN[i][1]).doubleValue()/1000;
result[i][0] =p/(B*W)*(Math.sqrt(Double.valueOf(a).doubleValue()))*(29.6-185.5*a/W+655.7*(Math.pow(a/W, 2))-1017*(Math.pow(a/W, 3)+638.9*(Math.pow(a/W, 4))));
double N = Double.valueOf(aN[i][0]).doubleValue();
result[i][1] = b1/c2[i]+2*b2*(N-c1[i])/(Math.pow(c2[i], 2));
}
}
return result;
}
//生成表格2
public boolean CreateData2(String [][] res){
boolean flag = true;
try{
double mRes;
File fileWriter = new File("D:/","ResultData2.xls");
fileWriter.createNewFile();
OutputStream os = new FileOutputStream(fileWriter);
WritableWorkbook wwb = Workbook.createWorkbook(os);
WritableSheet ws = wwb.createSheet("Result Data2", 0);
WritableCellFormat wcf = new WritableCellFormat();
wcf.setAlignment(Alignment.CENTRE);
for(int i=0;i<res.length;i++){
for(int j=0;j<res[i].length;j++){
mRes = Double.valueOf(res[i][j]).doubleValue();
jxl.write.Number number = new jxl.write.Number(j,i,mRes);
ws.addCell(number);
}
}
wwb.write();
wwb.close();
}catch(Exception e){
flag = false;
JOptionPane.showMessageDialog(null, "Warning", "Create Excel Exception !", JOptionPane.ERROR_MESSAGE);
}
return flag;
}
public static void main(String args[]){
GetData mGetData = new GetData();
mGetData.makeUI();
}
}