要印成方的?。。把下面的 j=i 改成 j=9 就行
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public class Show {
public static void main(String args[]) {
int i, j;
for (i=1; i=9; i++) {
for (j=1; j=i; j++)
System.out.print(i+"X"+j+"="+i*j+"\t");
System.out.println();
}
}
}
項目結(jié)構(gòu):
xls:
\\\
XlsMain .java 類
//該類有main方法,主要負(fù)責(zé)運行程序,同時該類中也包含了用poi讀取Excel(2003版)
*
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
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;
/**
*
* @author Hongten/br
*
* 參考地址:
*
*/
public class XlsMain {
public static void main(String[] args) throws IOException {
XlsMain xlsMain = new XlsMain();
XlsDto xls = null;
ListXlsDto list = xlsMain.readXls();
try {
XlsDto2Excel.xlsDto2Excel(list);
} catch (Exception e) {
e.printStackTrace();
}
for (int i = 0; i list.size(); i++) {
xls = (XlsDto) list.get(i);
System.out.println(xls.getXh() + " " + xls.getXm() + " "
+ xls.getYxsmc() + " " + xls.getKcm() + " "
+ xls.getCj());
}
}
/**
* 讀取xls文件內(nèi)容
*
* @return ListXlsDto對象
* @throws IOException
* 輸入/輸出(i/o)異常
*/
private ListXlsDto readXls() throws IOException {
InputStream is = new FileInputStream("pldrxkxxmb.xls");
HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is);
XlsDto xlsDto = null;
ListXlsDto list = new ArrayListXlsDto();
// 循環(huán)工作表Sheet
for (int numSheet = 0; numSheet hssfWorkbook.getNumberOfSheets(); numSheet++) {
HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
if (hssfSheet == null) {
continue;
}
// 循環(huán)行Row
for (int rowNum = 1; rowNum = hssfSheet.getLastRowNum(); rowNum++) {
HSSFRow hssfRow = hssfSheet.getRow(rowNum);
if (hssfRow == null) {
continue;
}
xlsDto = new XlsDto();
// 循環(huán)列Cell
// 0學(xué)號 1姓名 2學(xué)院 3課程名 4 成績
// for (int cellNum = 0; cellNum =4; cellNum++) {
HSSFCell xh = hssfRow.getCell(0);
if (xh == null) {
continue;
}
xlsDto.setXh(getValue(xh));
HSSFCell xm = hssfRow.getCell(1);
if (xm == null) {
continue;
}
xlsDto.setXm(getValue(xm));
HSSFCell yxsmc = hssfRow.getCell(2);
if (yxsmc == null) {
continue;
}
xlsDto.setYxsmc(getValue(yxsmc));
HSSFCell kcm = hssfRow.getCell(3);
if (kcm == null) {
continue;
}
xlsDto.setKcm(getValue(kcm));
HSSFCell cj = hssfRow.getCell(4);
if (cj == null) {
continue;
}
xlsDto.setCj(Float.parseFloat(getValue(cj)));
list.add(xlsDto);
}
}
return list;
}
/**
* 得到Excel表中的值
*
* @param hssfCell
* Excel中的每一個格子
* @return Excel中每一個格子中的值
*/
@SuppressWarnings("static-access")
private String getValue(HSSFCell hssfCell) {
if (hssfCell.getCellType() == hssfCell.CELL_TYPE_BOOLEAN) {
// 返回布爾類型的值
return String.valueOf(hssfCell.getBooleanCellValue());
} else if (hssfCell.getCellType() == hssfCell.CELL_TYPE_NUMERIC) {
// 返回數(shù)值類型的值
return String.valueOf(hssfCell.getNumericCellValue());
} else {
// 返回字符串類型的值
return String.valueOf(hssfCell.getStringCellValue());
}
}
}
XlsDto2Excel.java類
//該類主要負(fù)責(zé)向Excel(2003版)中插入數(shù)據(jù)
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
public class XlsDto2Excel {
/**
*
* @param xls
* XlsDto實體類的一個對象
* @throws Exception
* 在導(dǎo)入Excel的過程中拋出異常
*/
public static void xlsDto2Excel(ListXlsDto xls) throws Exception {
// 獲取總列數(shù)
int CountColumnNum = xls.size();
// 創(chuàng)建Excel文檔
HSSFWorkbook hwb = new HSSFWorkbook();
XlsDto xlsDto = null;
// sheet 對應(yīng)一個工作頁
HSSFSheet sheet = hwb.createSheet("pldrxkxxmb");
HSSFRow firstrow = sheet.createRow(0); // 下標(biāo)為0的行開始
HSSFCell[] firstcell = new HSSFCell[CountColumnNum];
String[] names = new String[CountColumnNum];
names[0] = "學(xué)號";
names[1] = "姓名";
names[2] = "學(xué)院";
names[3] = "課程名";
names[4] = "成績";
for (int j = 0; j CountColumnNum; j++) {
firstcell[j] = firstrow.createCell(j);
firstcell[j].setCellValue(new HSSFRichTextString(names[j]));
}
for (int i = 0; i xls.size(); i++) {
// 創(chuàng)建一行
HSSFRow row = sheet.createRow(i + 1);
// 得到要插入的每一條記錄
xlsDto = xls.get(i);
for (int colu = 0; colu = 4; colu++) {
// 在一行內(nèi)循環(huán)
HSSFCell xh = row.createCell(0);
xh.setCellValue(xlsDto.getXh());
HSSFCell xm = row.createCell(1);
xm.setCellValue(xlsDto.getXm());
HSSFCell yxsmc = row.createCell(2);
yxsmc.setCellValue(xlsDto.getYxsmc());
HSSFCell kcm = row.createCell(3);
kcm.setCellValue(xlsDto.getKcm());
HSSFCell cj = row.createCell(4);
cj.setCellValue(xlsDto.getCj());
(xlsDto.getMessage());
}
}
// 創(chuàng)建文件輸出流,準(zhǔn)備輸出電子表格
OutputStream out = new FileOutputStream("POI2Excel/pldrxkxxmb.xls");
hwb.write(out);
out.close();
System.out.println("數(shù)據(jù)庫導(dǎo)出成功");
}
}
XlsDto .java類
//該類是一個實體類
public class XlsDto {
/**
* 選課號
*/
private Integer xkh;
/**
* 學(xué)號
*/
private String xh;
/**
* 姓名
*/
private String xm;
/**
* 學(xué)院
*/
private String yxsmc;
/**
* 課程號
*/
private Integer kch;
/**
* 課程名
*/
private String kcm;
/**
* 成績
*/
private float cj;
public Integer getXkh() {
return xkh;
}
public void setXkh(Integer xkh) {
this.xkh = xkh;
}
public String getXh() {
return xh;
}
public void setXh(String xh) {
this.xh = xh;
}
public String getXm() {
return xm;
}
public void setXm(String xm) {
this.xm = xm;
}
public String getYxsmc() {
return yxsmc;
}
public void setYxsmc(String yxsmc) {
this.yxsmc = yxsmc;
}
public Integer getKch() {
return kch;
}
public void setKch(Integer kch) {
this.kch = kch;
}
public String getKcm() {
return kcm;
}
public void setKcm(String kcm) {
this.kcm = kcm;
}
public float getCj() {
return cj;
}
public void setCj(float cj) {
this.cj = cj;
}
}
后臺輸出:
數(shù)據(jù)庫導(dǎo)出成功
1.0 hongten 信息技術(shù)學(xué)院 計算機(jī)網(wǎng)絡(luò)應(yīng)用基礎(chǔ) 80.0
2.0 王五 信息技術(shù)學(xué)院 計算機(jī)網(wǎng)絡(luò)應(yīng)用基礎(chǔ) 81.0
3.0 李勝基 信息技術(shù)學(xué)院 計算機(jī)網(wǎng)絡(luò)應(yīng)用基礎(chǔ) 82.0
4.0 五班古 信息技術(shù)學(xué)院 計算機(jī)網(wǎng)絡(luò)應(yīng)用基礎(chǔ) 83.0
5.0 蔡詩蕓 信息技術(shù)學(xué)院 計算機(jī)網(wǎng)絡(luò)應(yīng)用基礎(chǔ) 84.0
//主要代碼 System.out.print("長:") double num1=input.nextDouble(); //代碼太多以后簡寫System...("寬:"); double num2=.... System....("高:")double num3=.... System...("表:"+(num1*num2+num1*num3+num2*num3)*2+" 體積:"+n1*n2*n3)//打字不容易求給分