據我所知，java中能操作Excel檔案的jar包有兩個

1. Apache公司的一個API
2. 微軟的java Excel包

在這裡我使用的是第二個，微軟公司的java Excel包
這個包出現了一個為題，並不能順利的輸出規定的xls
會報錯

在測試多次無果後，我使用了按格式輸出txt作為代替
當然，至少在WPS中，可以直接匯入txt作為Excel。影響不大

根據讀取的xls檔案不同，在程式碼中做一些相應修改就可以了

示例程式碼：

package wangjiawen;

import java.io.BufferedWriter;
import java.io.File;
import java.io
 
.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;

import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;


public class Wangjiawen {

    public static void main(String [] args) {

        try {
            WritableWorkbook bookw = Workbook.createWorkbook
 
(new File("2012(1).xls"));

            Workbook bookr = Workbook.getWorkbook(new File("綿陽市/2017.xls"));

            FileWriter fw = new FileWriter("綿陽市2017.txt");
            PrintWriter printwrite = new PrintWriter(fw);

            for(int i=0; i<bookr.getNumberOfSheets(); i++) {
                Sheet sheetr = bookr.getSheet
 
(i); 
                @SuppressWarnings("unused")
                WritableSheet sheetw= bookw.createSheet(sheetr.getName(), i);

                int m = 0;
                int sunshineday = 0;
                int averageday = 0;
                int highestday = 0;
                int lowestday = 0;
                int humidityday = 0;
                int rainday = 0;
                String time = "2012-01";
                float sunshine = 0;
                float average = 0;
                float highest = 0;
                float lowest = 0;
                float humidity = 0;
                float rain = 0;

                for(int j=1; j<sheetr.getRows(); j++) {
                    @SuppressWarnings("unused")
                    int n = 1;
                    Cell[] cell = sheetr.getRow(j);
                    if(cell.length > 10) {
                        String newtime = cell[4].getContents();
                        if(newtime.length() > 7) {
                            newtime = newtime.substring(0, 7);
                            m++;
                            if(newtime.equals(time)) {

                                String cell5 = cell[5].getContents().toString();
                                if(cell5!="" && cell5!="#DIV/0!" && Float.parseFloat(cell5)<32000) {
                                    sunshine += Float.parseFloat(cell[5].getContents());
                                    sunshineday++;
                                }
                                String cell6 = cell[6].getContents().toString();
                                if(cell6!="" && cell6!="#DIV/0!" && Float.parseFloat(cell6)<32000) {
                                    average += Float.parseFloat(cell[6].getContents());
                                    averageday++;
                                }
                                String cell7 = cell[7].getContents().toString();
                                if(cell7!="" && cell7!="#DIV/0!" && Float.parseFloat(cell7)<32000) {
                                    highest += Float.parseFloat(cell[7].getContents());
                                    highestday++;
                                }
                                String cell8 = cell[8].getContents().toString();
                                if(cell8!="" && cell8!="#DIV/0!" && Float.parseFloat(cell8)<32000) {    
                                    lowest += Float.parseFloat(cell[8].getContents());
                                    lowestday++;
                                }
                                String cell9 = cell[9].getContents().toString();
                                if(cell9!="" && cell9!="#DIV/0!" && Float.parseFloat(cell9)<32000) {    
                                    humidity += Float.parseFloat(cell[9].getContents());
                                    humidityday++;
                                }
                                String cell10 = cell[10].getContents().toString();
                                if(cell10!="" && cell10!="#DIV/0!" && Float.parseFloat(cell10)<32000) { 
                                    rain += Float.parseFloat(cell[10].getContents());
                                    rainday++;
                                }
                            }else {
                                if(m>1) {
                                    System.out.printf("%s ", cell[0].getContents());
                                    printwrite.printf("%s ", cell[0].getContents());
                                    if(cell[1].getContents().length()>2) {
                                        System.out.printf("%s ", cell[1].getContents());
                                        printwrite.printf("%s ", cell[1].getContents());
                                    }else {
                                        System.out.printf("%s 　", cell[1].getContents());
                                        printwrite.printf("%s 　", cell[1].getContents());
                                        System.out.printf("");
                                        printwrite.printf("");
                                    }
                                        System.out.printf("%s ", cell[2].getContents()); 
                                        System.out.printf(" %s ", cell[3].getContents());
                                        System.out.printf(" %s ", time); 
                                        System.out.printf(" %6.7f ", sunshine/sunshineday); 
                                        System.out.printf(" %6.7f ", average/averageday);
                                        System.out.printf(" %6.7f ", highest/highestday);
                                        System.out.printf(" %6.7f ", lowest/lowest);
                                        System.out.printf(" %6.7f ", humidity/humidityday); 
                                        System.out.printf(" %6.7f ", rain/rainday);
                                        System.out.printf(" %d ", m);
                                        System.out.println("");
                                        printwrite.printf("%s ", cell[2].getContents()); 
                                        printwrite.printf(" %s ", cell[3].getContents());
                                        printwrite.printf(" %s ", time); 
                                        printwrite.printf(" %6.7f ", sunshine/sunshineday); 
                                        printwrite.printf(" %6.7f ", average/averageday);
                                        printwrite.printf(" %6.7f ", highest/highestday);
                                        printwrite.printf(" %6.7f ", lowest/lowestday);
                                        printwrite.printf(" %6.7f ", humidity/humidityday); 
                                        printwrite.printf(" %6.7f ", rain/rainday);
                                        printwrite.printf(" %d ", m);
                                        printwrite.println("");
                                }

                                m = 0;
                                time = newtime;
                                sunshineday = 0; 
                                averageday = 0;  
                                highestday = 0;  
                                lowestday = 0;   
                                humidityday = 0; 
                                rainday = 0;     
                                String cell5 = cell[5].getContents().toString();
                                if(cell5!="" && cell5!="#DIV/0!" && Float.parseFloat(cell5)<32000) {
                                    sunshine = Float.parseFloat(cell[5].getContents());
                                    sunshineday++;
                                }else {
                                    sunshine = 0;
                                }
                                String cell6 = cell[6].getContents().toString();
                                if(cell6!="" && cell6!="#DIV/0!" && Float.parseFloat(cell6)<32000) {
                                    average = Float.parseFloat(cell[6].getContents());
                                    averageday++;
                                }else {
                                    average = 0;
                                }
                                String cell7 = cell[7].getContents().toString();
                                if(cell7!="" && cell7!="#DIV/0!" && Float.parseFloat(cell7)<32000) {
                                    highest = Float.parseFloat(cell[7].getContents());
                                    highestday++;
                                }else {
                                    highest = 0;
                                }
                                String cell8 = cell[8].getContents().toString();
                                if(cell8!="" && cell8!="#DIV/0!" && Float.parseFloat(cell8)<32000) {    
                                    lowest = Float.parseFloat(cell[8].getContents());
                                    lowestday++;
                                }else {
                                    lowest = 0;
                                }
                                String cell9 = cell[9].getContents().toString();
                                if(cell9!="" && cell9!="#DIV/0!" && Float.parseFloat(cell9)<32000) {    
                                    humidity = Float.parseFloat(cell[9].getContents());
                                    humidityday++;
                                }else {
                                    humidity = 0;
                                }
                                String cell10 = cell[10].getContents().toString();
                                if(cell10!="" && cell10!="#DIV/0!" && Float.parseFloat(cell10)<32000) { 
                                    rain = Float.parseFloat(cell[10].getContents());
                                    rainday++;
                                }else {
                                    rain = 0;
                                }
                            }
                        }
                    }


//                  if(newtime.equals(time)) {
//                      System.out.println(time);
//                      time = newtime;
//                  }

                    if(j == sheetr.getRows()-1) {
                        if(m>1) {
                            System.out.printf("%s ", cell[0].getContents());
                            printwrite.printf("%s ", cell[0].getContents());
                            if(cell[1].getContents().length()>2) {
                                System.out.printf("%s ", cell[1].getContents());
                                printwrite.printf("%s ", cell[1].getContents());
                            }else {
                                System.out.printf("%s 　", cell[1].getContents());
                                printwrite.printf("%s 　", cell[1].getContents());
                                System.out.printf("");
                                printwrite.printf("");
                            }
                                System.out.printf("%s ", cell[2].getContents()); 
                                System.out.printf(" %s ", cell[3].getContents());
                                System.out.printf(" %s ", time); 
                                System.out.printf(" %6.7f ", sunshine/sunshineday); 
                                System.out.printf(" %6.7f ", average/averageday);
                                System.out.printf(" %6.7f ", highest/highestday);
                                System.out.printf(" %6.7f ", lowest/lowest);
                                System.out.printf(" %6.7f ", humidity/humidityday); 
                                System.out.printf(" %6.7f ", rain/rainday);
                                System.out.printf(" %d ", m);
                                System.out.println("");
                                printwrite.printf("%s ", cell[2].getContents()); 
                                printwrite.printf(" %s ", cell[3].getContents());
                                printwrite.printf(" %s ", time); 
                                printwrite.printf(" %6.7f ", sunshine/sunshineday); 
                                printwrite.printf(" %6.7f ", average/averageday);
                                printwrite.printf(" %6.7f ", highest/highestday);
                                printwrite.printf(" %6.7f ", lowest/lowestday);
                                printwrite.printf(" %6.7f ", humidity/humidityday); 
                                printwrite.printf(" %6.7f ", rain/rainday);
                                printwrite.printf(" %d ", m);
                                printwrite.println("");
                        }
                    }
                }

            }

        } catch (BiffException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}