excel文件下载工具分享

好久没和大家分享点东西了，今天就和大家分享一个excel文件下载工具，项目中有很多下载功能，尤其管理系统，每个菜单下都有下载功能，如果没有一个公共的工具类，就会乱套，维护起来也很吃力(不同菜单下的下载因为excel格式的不同导致写法不同)，那么我们用什么方法能够使得通过一个公共的API调用+组装各自不同的参数就可以实现不同菜单下的下载功能呢？我想你也该想到了，那就是java反射机制。不多说了，我先大体说下我的代码的用法：

涉及到的几个方法：BaseInf，fillFieldAndTitle，initParamCondition，downloadTransferProList

BaseInf：该实体类封装了excel文件的第一行标题，行读取方法，转义列表，行尾统计，数据处理类，数据处理方法

fillFieldAndTitle：组装BaseInf数据

downloadTransferProList：excel文件下载的方法，读取前面组装的java反射用的数据，利用ExcelUtil中的java反射程序实现下载

自己看去吧，很简单的

具体的代码实现：

import java.lang.reflect.Method;

import java.util.Map;

/**

* 列开头信息和结尾信息

public class BaseInf {

* 标题

private String titleName;

* 行读取方法

private String columMethod;

* 转义列表

private Map<String, String> map;

* 行尾统计

private String count;

/**

* 数据处理类

private Class<?> clazz;

/**

* 数据处理方法

private Method method;

/**

* 全成员构造方法

* @param titleName

* @param columMethod

* @param map

* @param count

* @param clazz

* @param method

public BaseInf(String titleName, String columMethod, Map<String, String> map, String count, Class<?> clazz,

Method method) {

super();

this.titleName = titleName;

this.columMethod = columMethod;

this.map = map;

this.count = count;

this.clazz = clazz;

this.method = method;

}

public BaseInf(String titleName, String columMethod, Class<?> clazz, Method method) {

super();

this.titleName = titleName;

this.columMethod = columMethod;

this.clazz = clazz;

this.method = method;

}

public BaseInf(String titleName, String columMethod,String count, Class<?> clazz, Method method) {

super();

this.titleName = titleName;

this.columMethod = columMethod;

this.clazz = clazz;

this.method = method;

this.count = count;

}

/**

* 有转义列表有统计的构造方法

* @param titleName

* @param columMethod

* @param map

* @param count

public BaseInf(String titleName, String columMethod, Map<String, String> map, String count) {

super();

this.titleName = titleName;

this.columMethod = columMethod;

this.map = map;

this.count = count;

}

/**

* 有转义列表构造方法

* @param titleName

* 标题

* @param columMethod

* 获取方法

* @param map

* 转义列表

public BaseInf(String titleName, String columMethod, Map<String, String> map) {

super();

this.titleName = titleName;

this.columMethod = columMethod;

this.map = map;

this.count = null;

}

/**

* 无转义列表有合计数据

* @param titleName 标题

* @param columMethod 读取方法列表

* @param count 合计值

public BaseInf(String titleName, String columMethod, String count) {

super();

this.titleName = titleName;

this.columMethod = columMethod;

this.map = null;

this.count = count;

}

/**

* 无转义列表无统计构造方法

* @param titleName

* 标题

* @param columMethod

* 获取方法

public BaseInf(String titleName, String columMethod) {

super();

this.titleName = titleName;

this.columMethod = columMethod;

this.map = null;

this.count = null;

}

public String getTitleName() {

return titleName;

}

public String getColumMethod() {

return columMethod;

}

public Map<String, String> getMap() {

return map;

}

public String getCount() {

return count;

}

public Class<?> getClazz() {

return clazz;

}

public Method getMethod() {

return method;

}

/**

* 下载接口

public ActionForward downloadTransferProList(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response) {

TtransferParam transferParam = new TtransferParam();

List<TtransferInfo> listinfo = null;

SimpleDateFormat sdf2 = new SimpleDateFormat("yyyyMMdd");

String startAppTime = sdf2.format(new Date());

// 开始时间

String fileName = "excel文件名称" + startAppTime;// 文件名称

try {

* 初始化查询条件参数

transferParam = transferService.initParamCondition(request);

* 根据查询条件查询信结果

listinfo = (List<TtransferInfo>) transferService.getSettleManageList(transferParam);

List<BaseInf> baseInfList = transferService.fillFieldAndTitle(listinfo);// 获取封装excel中单元格属性名和获取值的对象的集合

* 调用ExcelUtil工具类实现excel下载功能

if (response != null && listinfo != null) {

org.apache.poi.ss.usermodel.Workbook workbook = ExcelUtil.createWorkbook(2007, "结算提现划款查询", baseInfList,

listinfo,true);

ExcelUtil.workbook2InputStream(response, workbook, fileName, ".xls");

return null;

}

} catch (Exception e) {

String memo = "下载失败，请稍后再试 ···";

log.info("异常:{} ", memo, e);

request.setAttribute(ReturnConstant.MEMO, memo);

return mapping.findForward(ReturnConstant.ERROR);

}

return null;

}

/*封装查询参数*/

public TtransferParam initParamCondition(HttpServletRequest request) throws ParseException {

String type = request.getParameter("type");

TtransferParam transferParam = new TtransferParam();

transferParam.setMakeExcel(true);

// 参数判断

if (type != null ) {

transferParam.setType(Integer.parseInt(type));

} else {

type = "";

}

// 银行ID

if (StringUtil.isNotEmpty(bankId)) {

transferParam.setBankId(bankId);

} else {

bankId = "";

}

transferParam.setSTATE(1); // 状态

return transferParam;

}

public List<BaseInf> fillFieldAndTitle(List<TtransferInfo> list) throws NoSuchMethodException, SecurityException {

// 金额

long ableSumAmt = 0L;

// 手续费

long stlSumFee = 0L;

for (TtransferInfo tranfer : list) {

ableSumAmt += (tranfer.getT0_USEABLE_AMT() == null ? 0 : tranfer.getT0_USEABLE_AMT());

stlSumFee += (tranfer.getSTL_FEE() == null ? 0 : tranfer.getSTL_FEE());

}

List<BaseInf> baseInfList = new ArrayList<BaseInf>();

BaseInf baseInf = new BaseInf("批次号", "getID");

baseInfList.add(baseInf);

baseInf = new BaseInf("金额(元)", "getT0UserableAmt",Tools.formatAmt(ableSumAmt));

baseInfList.add(baseInf);

baseInf = new BaseInf("结算手续费(元)", "getStlFee",Tools.formatAmt(stlSumFee));

baseInfList.add(baseInf);

baseInf = new BaseInf("状态", "getSTATEStr");

baseInfList.add(baseInf);

return baseInfList;

}

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.math.BigDecimal;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.List;

import java.util.Map;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.hssf.util.HSSFColor;

import org.apache.poi.ss.usermodel.Cell;

import org.apache.poi.ss.usermodel.CellStyle;

import org.apache.poi.ss.usermodel.Font;

import org.apache.poi.ss.usermodel.IndexedColors;

import org.apache.poi.ss.usermodel.Row;

import org.apache.poi.ss.usermodel.Sheet;

import org.apache.poi.ss.usermodel.Workbook;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelUtil {

// 私有构造方法禁止new实例

private ExcelUtil() {

}

// 日志工具

// private static final Logger logger =

// LoggerFactory.getLogger(ExcelUtil.class);

// 默认日期格式

private static final String DEFAULT_DATE_PATTERN = "yyyy年MM月dd日 hh点mm分ss秒";

// 默认行高

//Columns

private static final Short DEFAULT_COLUMNS_HEIGHT = 400;

private static final Short DEFAULT_COLUMNS_WEIGHT = 1700;

/**

* 将工作表输出到浏览器中

* @param response 响应流

* @param workbook 创建完成的工作表

* @param fileName 文件名

* @param sufferNm 文件后缀名

* @throws Exception 异常

public static void workbook2InputStream(HttpServletResponse response, Workbook workbook, String fileName,

String sufferNm) throws Exception {

//除去fileName的空格

fileName = fileName.replace(" ", "");

try (ServletOutputStream out = response.getOutputStream()) {

response.setCharacterEncoding("utf-8");

response.setHeader("Content-type", "application/vnd.ms-excel");

response.setHeader("Content-Disposition",

"attachment; filename=" + new String((fileName).getBytes("gb2312"), "ISO8859-1") + sufferNm);

// 设置下载头信息

response.setContentType("application nd.ms-excel; charset=utf-8");

workbook.write(out);

out.flush();

}

/**

* 实体类单层嵌套有统计栏

public static Workbook createWorkbookHasCount(int version, String sheetNm, List<BaseInf> baseInfList, List<?> list)

throws NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException,

InvocationTargetException {

return createWorkbook(version, sheetNm, baseInfList, list, null, true);

}

/**

* 实体类单层嵌套自定义是否有统计栏

public static Workbook createWorkbook(int version, String sheetNm, List<BaseInf> baseInfList, List<?> list, Boolean openCount)

throws NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException,

InvocationTargetException {

return createWorkbook(version, sheetNm, baseInfList, list, null, openCount);

}

/**

* 实体类单层嵌套无统计栏

public static Workbook createWorkbook(int version, String sheetNm, List<BaseInf> baseInfList, List<?> list)

throws NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException,

InvocationTargetException {

return createWorkbook(version, sheetNm, baseInfList, list, null, false);

}

/**

* 创建一个数据表实体类嵌套实体类

* @param version excel版本 2007 或者其他

* @param sheetNm sheet 名称

* @param baseInfList 数据基础信息

* @param list 数据

* @param innerMethod 实体类多层嵌套

* @return 构建完成的数据表对象

* @throws SecurityException 安全异常

* @throws NoSuchMethodException 方法没有异常

* @throws InvocationTargetException 调用异常

* @throws IllegalArgumentException 非法参数异常

* @throws IllegalAccessException 非法访问异常

* @see BaseInf

public static Workbook createWorkbook(int version, String sheetNm, List<BaseInf> baseInfList, List<?> list,

String innerMethod, Boolean openCount) throws NoSuchMethodException, SecurityException, IllegalAccessException,

IllegalArgumentException, InvocationTargetException {

SimpleDateFormat sdf = new SimpleDateFormat(DEFAULT_DATE_PATTERN);

Workbook workbook;

if (version == 2007) {

workbook = new XSSFWorkbook();

} else {

workbook = new HSSFWorkbook();

}

Sheet sheet = workbook.createSheet(isEmpty(sheetNm) ? "sheet1" : sheetNm);

// 写入标题

CellStyle titleStyle = titleStyle(workbook);

// 创建标题行(第一行)

Row titleRow = sheet.createRow(0);

// 设置第一行的行高

titleRow.setHeight(DEFAULT_COLUMNS_HEIGHT);

// 设置序号

sheet.setColumnWidth(0, DEFAULT_COLUMNS_WEIGHT);

Cell cell = titleRow.createCell(0);

setTitle(baseInfList, sheet, titleStyle, titleRow, cell);

* 写入数据

* 写入数据按照先行后列的的方式进行

CellStyle dataStyle = dataStyle(workbook);

Row dataRow;

for (int i = 0; i < list.size(); i++) {

// 创建行

dataRow = sheet.createRow(i + 1);

// 创建列此处为序号列

cell = dataRow.createCell(0);

cell.setCellType(Cell.CELL_TYPE_STRING);

cell.setCellValue(i + 1);

cell.setCellStyle(titleStyle);

// 序号列创建完毕开始创建数据列

for (int j = 0; j < baseInfList.size(); j++) {

// 创建数据列

cell = dataRow.createCell(j + 1);

BaseInf baseInf = baseInfList.get(j);

// 设值

Method method;

Object value;

if (innerMethod != null) {

method = list.get(i).getClass().getMethod(innerMethod);

Object obj = method.invoke(list.get(i));

method = obj.getClass().getMethod(baseInf.getColumMethod());

value = method.invoke(obj);

} else {

method = list.get(i).getClass().getMethod(baseInf.getColumMethod());

value = method.invoke(list.get(i));

}

String returnType = method.getReturnType().getName().toLowerCase();

//数据处理类处理数据库原始生成数据

Class<?> valueClazz = baseInf.getClazz();

Method valueMethod = baseInf.getMethod();

if (valueClazz != null && valueMethod != null) {

value = valueMethod.invoke(valueClazz, value);

}

cell.setCellStyle(dataStyle);

// 转义列表

Map<String, String> transMap = baseInf.getMap();

// 判断是否需要转义

if (transMap == null) {

if (returnType.contains("string")) {

cell.setCellType(Cell.CELL_TYPE_STRING);

cell.setCellValue(value == null ? "" : value.toString());

} else if (returnType.contains("integer") || returnType.contains("int")

|| returnType.contains("bigdecimal") || returnType.contains("double")

|| returnType.contains("long") || returnType.contains("float")) {

cell.setCellType(Cell.CELL_TYPE_NUMERIC);

if (value != null) {

cell.setCellValue(new Double(value.toString()));

} else {

cell.setCellValue(0.0d);

}

} else if (returnType.contains("date")) {

cell.setCellType(Cell.CELL_TYPE_STRING);

cell.setCellValue(value == null ? null : sdf.format((Date) value));

} else {

cell.setCellType(Cell.CELL_TYPE_STRING);

cell.setCellValue(value == null ? "" : value.toString());

}

} else {

cell.setCellType(Cell.CELL_TYPE_STRING);

String cellValue = value == null ? "" : transMap.get(tse(value.toString()));

cell.setCellValue(cellValue == null ? tse(value.toString()) : cellValue);

}

// 创建统计行

if (openCount) {

openCount(baseInfList, sheet, titleStyle, dataStyle, list.size());

}

return workbook;

}

public static Workbook createWorkbookForMap(int version, String sheetNm, List<BaseInf> baseInfList, List<Map<String,Object>> list,Boolean openCount) throws SecurityException, IllegalAccessException,

IllegalArgumentException, InvocationTargetException {

SimpleDateFormat sdf = new SimpleDateFormat(DEFAULT_DATE_PATTERN);

Workbook workbook;

if (version == 2007) {

workbook = new XSSFWorkbook();

} else {

workbook = new HSSFWorkbook();

}

Sheet sheet = workbook.createSheet(isEmpty(sheetNm) ? "sheet1" : sheetNm);

// 写入标题

CellStyle titleStyle = titleStyle(workbook);

// 创建标题行(第一行)

Row titleRow = sheet.createRow(0);

// 设置第一行的行高

titleRow.setHeight(DEFAULT_COLUMNS_HEIGHT);

// 设置序号

sheet.setColumnWidth(0, DEFAULT_COLUMNS_WEIGHT);

Cell cell = titleRow.createCell(0);

setTitle(baseInfList, sheet, titleStyle, titleRow, cell);

* 写入数据

* 写入数据按照先行后列的的方式进行

CellStyle dataStyle = dataStyle(workbook);

Row dataRow;

for (int i = 0; i < list.size(); i++) {

// 创建行

dataRow = sheet.createRow(i + 1);

// 创建列此处为序号列

cell = dataRow.createCell(0);

cell.setCellType(Cell.CELL_TYPE_STRING);

cell.setCellValue(i + 1);

cell.setCellStyle(titleStyle);

// 序号列创建完毕开始创建数据列

for (int j = 0; j < baseInfList.size(); j++) {

// 创建数据列

cell = dataRow.createCell(j + 1);

BaseInf baseInf = baseInfList.get(j);

// 设值

Object value = list.get(i).get(baseInf.getColumMethod());

//数据处理类处理数据库原始生成数据

Class<?> valueClazz = baseInf.getClazz();

Method valueMethod = baseInf.getMethod();

if (valueClazz != null && valueMethod != null) {

value = valueMethod.invoke(valueClazz, value);

}

cell.setCellStyle(dataStyle);

// 转义列表

Map<String, String> transMap = baseInf.getMap();

// 判断是否需要转义

if (transMap == null) {

if(value instanceof String){

cell.setCellType(Cell.CELL_TYPE_STRING);

cell.setCellValue(value.toString());

}

if(value instanceof Integer || value instanceof BigDecimal || value instanceof Long){

cell.setCellType(Cell.CELL_TYPE_NUMERIC);

cell.setCellValue(new Double(value.toString()));

}

if(value instanceof Date){

cell.setCellType(Cell.CELL_TYPE_STRING);

cell.setCellValue(sdf.format((Date) value));

}else {

cell.setCellType(Cell.CELL_TYPE_STRING);

cell.setCellValue(value == null ? "" : value.toString());

}

} else {

cell.setCellType(Cell.CELL_TYPE_STRING);

String cellValue = value == null ? "" : transMap.get(tse(value.toString()));

cell.setCellValue(cellValue == null ? tse(value.toString()) : cellValue);

}

// 创建统计行

if (openCount) {

openCount(baseInfList, sheet, titleStyle, dataStyle, list.size());

}

return workbook;

}

/**

* 设置标题

private static void setTitle(List<BaseInf> baseInfList, Sheet sheet, CellStyle titleStyle, Row titleRow, Cell cell) {

cell.setCellType(Cell.CELL_TYPE_STRING);

cell.setCellValue("序号");

cell.setCellStyle(titleStyle);

// 其他标题

for (int i = 0; i < baseInfList.size(); i++) {

String titleName = baseInfList.get(i).getTitleName();

// 设置单元格的宽

sheet.setColumnWidth(i + 1, titleName.length() * DEFAULT_COLUMNS_WEIGHT);

cell = titleRow.createCell(i + 1);

cell.setCellType(Cell.CELL_TYPE_STRING);

cell.setCellValue(titleName);

cell.setCellStyle(titleStyle);

}

private static void openCount(List<BaseInf> baseInfList, Sheet sheet, CellStyle titleStyle, CellStyle dataStyle, int size) {

Row dataRow;

Cell cell;

dataRow = sheet.createRow(size + 1);

// 创建列此处为序号列

cell = dataRow.createCell(0);

cell.setCellType(Cell.CELL_TYPE_STRING);

cell.setCellValue("统计");

cell.setCellStyle(titleStyle);

for (int i = 0; i < baseInfList.size(); i++) {

BaseInf baseInf = baseInfList.get(i);

cell = dataRow.createCell(i + 1);

cell.setCellType(Cell.CELL_TYPE_STRING);

cell.setCellStyle(dataStyle);

if (baseInf.getCount() != null) {

cell.setCellValue(baseInf.getCount());

} else {

cell.setCellValue("");

}

/**

* 删除字符串内的回车空格和两端空白

private static String tse(String str) {

return str == null ? "" : str.replace(" ", "").replace("/r", "").replace("/n", "").trim();

}

// 判断非空

private static boolean isEmpty(String str) {

return str == null || "".equals(str.trim());

}

/**

* 设置标题样式

* @param workbook 工作表

* @return 标题样式

private static CellStyle titleStyle(Workbook workbook) {

CellStyle titleStyle = workbook.createCellStyle();

titleStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());

titleStyle.setFillPattern(CellStyle.SOLID_FOREGROUND);

// 居中

titleStyle.setAlignment(CellStyle.ALIGN_CENTER_SELECTION);

titleStyle.setBorderLeft((short) 1);

titleStyle.setBorderRight((short) 1);

titleStyle.setBorderBottom((short) 1);

titleStyle.setBorderTop((short) 1);

Font font = workbook.createFont();

font.setFontHeightInPoints((short) 12);// 设置字体大小

titleStyle.setFont(font);// 选择需要用到的字体格式

return titleStyle;

}

/**

* 数据样式

* @param workbook 工作表

* @return 数据样式

private static CellStyle dataStyle(Workbook workbook) {

CellStyle dataStyle = workbook.createCellStyle();

dataStyle.setBorderBottom((short) 1);

dataStyle.setBorderLeft((short) 1);

dataStyle.setBorderRight((short) 1);

dataStyle.setBorderTop((short) 1);

dataStyle.setBottomBorderColor(HSSFColor.BLACK.index);

return dataStyle;

}

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excel文件下载工具分享

具体的代码实现：

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