使用JExcel导出excel文件

package org.aaa.portal.tools;

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Map;

import jxl.Workbook;
import jxl.format.Alignment;
import jxl.format.Border;
import jxl.format.BorderLineStyle;
import jxl.format.VerticalAlignment;
import jxl.write.Label;
import jxl.write.Number;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class ExcelUtils {
public static final String COLUMN_KEY="key";    //列的键，对应JSONObject的key
public static final String COLUMN_TEXT="text";    //列头名称
/**
* 把JSONArray存储为Excel
* @param fileName    完整文件路径名称
* @param sheetName    sheet 名称
* @param ja JSONArray
* @param columns
*     List<Map<String, String>> 按照list Item的顺序生成列
*    Map格式：
Map<String,String> column1 =new HashMap<String,String>();
column1.put(ExcelUtils.COLUMN_KEY, "sUserName");
column1.put(ExcelUtils.COLUMN_TEXT, "用户名");
columns.add(column1);
*/
public static boolean exportFromJSONArray(String fileName, String sheetName,JSONArray ja,
List<Map<String, String>> columns) {
boolean isSuccess=true;
WritableWorkbook book;
try {
//确保保存文件目录存在
String filePathStr=fileName.substring(0,fileName.lastIndexOf(File.separatorChar));
File filePath=new File(filePathStr);
if(!filePath.exists()){
filePath.mkdirs();
}
//确保保存文件存在
File file=new File(fileName);
if(!file.exists()){
file.createNewFile();
}
// 在指定地址创建EXCEL表
book = Workbook.createWorkbook(file);
// 设置第一个工作薄的名字
WritableSheet sheet = book.createSheet(sheetName, 0);

// 设置列头
for (int i = 0; i < columns.size(); i++) {
// 设置列宽
sheet.setColumnView(i, 20);
// 设置列头样式
// 分别设置表头，表元的格式
WritableFont fontb = new WritableFont(WritableFont.ARIAL, 8,
WritableFont.BOLD, false); // 粗体
WritableCellFormat formatb = new WritableCellFormat(fontb);
formatb.setAlignment(Alignment.CENTRE); // 水平居中
formatb.setVerticalAlignment(VerticalAlignment.CENTRE); // 垂直居中
formatb.setBorder(Border.ALL, BorderLineStyle.THIN); // 边框
// 填充列名
Label labelb = new Label(i, 0, columns.get(i).get("text"),
formatb);
sheet.addCell(labelb);
}

//设置数据单元格格式
WritableFont fontc = new WritableFont(WritableFont.ARIAL, 8,
WritableFont.NO_BOLD, false);
WritableCellFormat formatc = new WritableCellFormat(fontc);
formatc.setAlignment(Alignment.CENTRE);
formatc.setVerticalAlignment(VerticalAlignment.CENTRE);
formatc.setBorder(Border.ALL, BorderLineStyle.THIN);
// 填充数据
for (int i = 0; i < ja.size(); i++) {
JSONObject jo = ja.getJSONObject(i);
// 按照预设的列顺序填充
for (int j = 0; j < columns.size(); j++) {
String key = columns.get(j).get("key");
Object text = jo.get(key);
// 如果是数字，则按照数字的格式填充
if (text != null && text.toString().matches("\\d+")) {
Number numberc = new Number(j, i+1, Long.parseLong(text.toString()),
formatc);
sheet.addCell(numberc);
} else {
//其余全按文字处理
Label labelb = new Label(j, i+1, text.toString(), formatc);
sheet.addCell(labelb);
}
}
}

book.write();
book.close();
} catch (IOException e) {
e.printStackTrace();
isSuccess=false;
} catch (RowsExceededException e) {
e.printStackTrace();
isSuccess=false;
} catch (WriteException e) {
e.printStackTrace();
isSuccess=false;
}
return isSuccess;
}
}