使用jxl.jar操作Excel

在工程的build path中添加jxl.jar，网址：http://www.andykhan.com/jexcelapi/

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;

/**
 * 将错误码的描述信息导入到表格中
 */
public class ErrorsToExcel {
    //错误码文件的默认编码格式
    private String defaultEncoding = "gb2312";
    
    private String errorsXls = "errorMessage_batch_template.xls";
    private String errorsSrcFile = "error-messages.properties";
    
    //写入错误码的列
    private int errorCodeIndex = 1;
    //要写入错误描述的表格的列
    private int[] errorDescIndexs = {5,6};
    
    /**
     * 将错误码的相关数据写入到给定的Excel中
     */
    public boolean appendErrorsToXls(){
        boolean flag = true;
        
        Workbook book = null;
        WritableWorkbook writableWorkbook = null;
        
        try{
            File excelFile = new File(errorsXls);
            if(!excelFile.exists()){
                System.out.println("要导入的Excel模板不存在");
                return false;
            }
            
            //获取可写入的Excel对象
            book = Workbook.getWorkbook(excelFile);
            writableWorkbook = Workbook.createWorkbook(excelFile, book);
            
            //获取可写入的表格对象
            WritableSheet targetSheet = writableWorkbook.getSheet(0);
            
            //添加数据
            if(!appendDataToSheet(targetSheet))
                flag = false;
            
            //将表格中的数据写入Excel中
            writableWorkbook.write();
            
        }catch(Exception e){
            System.out.println("将错误码放到Excel时出错");
            flag = false;
        }finally{
            if(book!=null){
                book.close();
            }
            if(writableWorkbook!=null){
                try {
                    writableWorkbook.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
        
        return flag;
    }
    
    /**
     * 将数据写入到表格Sheet中
     * 
     * @param targetSheet 要写入数据的表格
     * @return true表示写入成功  false表示失败
     * @throws IOException
     */
    private boolean appendDataToSheet(WritableSheet targetSheet) throws IOException{
        boolean flag = true;
        File file = null;
        
        file = new File(errorsSrcFile);
        
        if(!file.exists()){
            System.out.println("错误码源文件不存在");
            return false;
        }
        
        //进行编码格式的转换
        InputStreamReader streamReader = new InputStreamReader(new FileInputStream(file), defaultEncoding);
        BufferedReader reader = new BufferedReader(streamReader);
        String nextLine = "";
        
        int row = 1;
        
        //处理格式
        while((nextLine=reader.readLine())!=null){
            String[] codeDescs = nextLine.split("=");
            if(codeDescs.length<=1){    //非错误码内容行
                continue;
            }
            
            try{
                //插入错误码单元格
                Label codeLabel = generateLabel(errorCodeIndex-1, row, codeDescs[0]);
                targetSheet.addCell(codeLabel);
                
                //插入描述信息单元格
                for(int j=0; j<errorDescIndexs.length; ++j ){
                    Label descLabel = generateLabel(errorDescIndexs[j]-1, row, codeDescs[1]);
                    targetSheet.addCell(descLabel);
                }
            }catch(Exception e){
                System.out.println("插入单元格信息出错");
            }
            
            row++;
        }
        
        return flag;
    }
    
    private Label generateLabel(int col, int row, String contents){
        //Label的构造函数中是列序号在前，行序号在后
        return new Label(col, row, contents);
    }

    public String getErrorsXls() {
        return errorsXls;
    }
    public void setErrorsXls(String errorsXls) {
        this.errorsXls = errorsXls;
    }
    public String getErrorsSrcFile() {
        return errorsSrcFile;
    }
    public void setErrorsSrcFile(String errorsSrcFile) {
        this.errorsSrcFile = errorsSrcFile;
    }
    
    public static void main(String[] args){
        ErrorsToExcel transformer = new ErrorsToExcel();
        
        if(transformer.appendErrorsToXls()){
            System.out.println("导入Excel成功");
        }else{
            System.out.println("导入Excel失败");
        }
    }
}

遇到的奇葩问题：

在Java工程中使用jxl时，一切正常。但是，日后将相应文件迁移到Spring MVC环境中使用时（且将jxl.jar加到了工程的build path中），但是加载工程时，每次调用到使用jxl的类时，都会报错jxl/write/writableCell类不存在；

解决方式：将jxl.jar放到WEB-INF/lib下解决；