java实现Excel表格导出
了解Excel组成：
1.excel文档后缀名.xls结尾
2.excel文档有若干个（小页）组成，小页之间空间，彼此独立
3.每一个【小页】都有自己的名称以及位置
4.每一个【小页】都会包含大量的【单元格】这些单元格是Excel保存数据的基本单元
5.【单元格】{保存数据，坐在行数，所在列数}
poi提供的API：
1.HSSFWorkbook------》描述内存中的Excel文档的对象
2.HSSFSheet---------》描述内存中的【小页】对象
3.HSSFCell-----------》描述内存中的【单元格】对象
4.HSSFRow------------》描述内存中的【行】对象
poi的maven依赖：
<!--export的依赖poi -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.9</version>
</dependency>
<!-- 使用poi生成excel表格 -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-excelant</artifactId>
<version>3.9</version>
</dependency>
把页面数据以Excel导出：
response.reset();清除buffer。设置页面不缓存注意事项:
response.setHeader("Content- disposition","attachment;filename="+new String(str.getBytes("gb2312"),"iso8859-1")); // 客户使用目标另存为对话框保存指定文件
response.setHeader("Content_Length",length);设置头文件的长度为指定文件的长度
实例一：
public ActionResult excelPrint() {
HSSFWorkbook workbook = new HSSFWorkbook();// 创建一个Excel文件
HSSFSheet sheet = workbook.createSheet();// 创建一个Excel的Sheet
sheet.createFreezePane(1, 3);// 冻结
// 设置列宽
sheet.setColumnWidth(0, 1000);
sheet.setColumnWidth(1, 3500);
sheet.setColumnWidth(2, 3500);
sheet.setColumnWidth(3, 6500);
sheet.setColumnWidth(4, 6500);
sheet.setColumnWidth(5, 6500);
sheet.setColumnWidth(6, 6500);
sheet.setColumnWidth(7, 2500);
// Sheet样式
HSSFCellStyle sheetStyle = workbook.createCellStyle();
// 背景色的设定
sheetStyle.setFillBackgroundColor(HSSFColor.GREY_25_PERCENT.index);
// 前景色的设定
sheetStyle.setFillForegroundColor(HSSFColor.GREY_25_PERCENT.index);
// 填充模式
sheetStyle.setFillPattern(HSSFCellStyle.FINE_DOTS);
// 设置列的样式
for (int i = 0; i <= 14; i++) {
sheet.setDefaultColumnStyle((short) i, sheetStyle);
}
// 设置字体
HSSFFont headfont = workbook.createFont();
headfont.setFontName("黑体");
headfont.setFontHeightInPoints((short) 22);// 字体大小
headfont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 加粗
// 另一个样式
HSSFCellStyle headstyle = workbook.createCellStyle();
headstyle.setFont(headfont);
headstyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
headstyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
headstyle.setLocked(true);
headstyle.setWrapText(true);// 自动换行
// 另一个字体样式
HSSFFont columnHeadFont = workbook.createFont();
columnHeadFont.setFontName("宋体");
columnHeadFont.setFontHeightInPoints((short) 10);
columnHeadFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
// 列头的样式
HSSFCellStyle columnHeadStyle = workbook.createCellStyle();
columnHeadStyle.setFont(columnHeadFont);
columnHeadStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
columnHeadStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
columnHeadStyle.setLocked(true);
columnHeadStyle.setWrapText(true);
columnHeadStyle.setLeftBorderColor(HSSFColor.BLACK.index);// 左边框的颜色
columnHeadStyle.setBorderLeft((short) 1);// 边框的大小
columnHeadStyle.setRightBorderColor(HSSFColor.BLACK.index);// 右边框的颜色
columnHeadStyle.setBorderRight((short) 1);// 边框的大小
columnHeadStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN); // 设置单元格的边框为粗体
columnHeadStyle.setBottomBorderColor(HSSFColor.BLACK.index); // 设置单元格的边框颜色
// 设置单元格的背景颜色（单元格的样式会覆盖列或行的样式）
columnHeadStyle.setFillForegroundColor(HSSFColor.WHITE.index);
HSSFFont font = workbook.createFont();
font.setFontName("宋体");
font.setFontHeightInPoints((short) 10);
// 普通单元格样式
HSSFCellStyle style = workbook.createCellStyle();
style.setFont(font);
style.setAlignment(HSSFCellStyle.ALIGN_LEFT);// 左右居中
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_TOP);// 上下居中
style.setWrapText(true);
style.setLeftBorderColor(HSSFColor.BLACK.index);
style.setBorderLeft((short) 1);
style.setRightBorderColor(HSSFColor.BLACK.index);
style.setBorderRight((short) 1);
style.setBorderBottom(HSSFCellStyle.BORDER_THIN); // 设置单元格的边框为粗体
style.setBottomBorderColor(HSSFColor.BLACK.index); // 设置单元格的边框颜色．
style.setFillForegroundColor(HSSFColor.WHITE.index);// 设置单元格的背景颜色．
// 另一个样式
HSSFCellStyle centerstyle = workbook.createCellStyle();
centerstyle.setFont(font);
centerstyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
centerstyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
centerstyle.setWrapText(true);
centerstyle.setLeftBorderColor(HSSFColor.BLACK.index);
centerstyle.setBorderLeft((short) 1);
centerstyle.setRightBorderColor(HSSFColor.BLACK.index);
centerstyle.setBorderRight((short) 1);
centerstyle.setBorderBottom(HSSFCellStyle.BORDER_THIN); // 设置单元格的边框为粗体
centerstyle.setBottomBorderColor(HSSFColor.BLACK.index); // 设置单元格的边框颜色．
centerstyle.setFillForegroundColor(HSSFColor.WHITE.index);// 设置单元格的背景颜色．
try {
// 创建第一行
HSSFRow row0 = sheet.createRow(0);
// 设置行高
row0.setHeight((short) 900);
// 创建第一列
HSSFCell cell0 = row0.createCell(0);
cell0.setCellValue(new HSSFRichTextString("中非发展基金投资项目调度会工作落实情况对照表"));
cell0.setCellStyle(headstyle);
/**
* 合并单元格
* 第一个参数：第一个单元格的行数（从0开始）
* 第二个参数：第二个单元格的行数（从0开始）
* 第三个参数：第一个单元格的列数（从0开始）
* 第四个参数：第二个单元格的列数（从0开始）
*/
CellRangeAddress range = new CellRangeAddress(0, 0, 0, 7);
sheet.addMergedRegion(range);
// 创建第二行
HSSFRow row1 = sheet.createRow(1);
HSSFCell cell1 = row1.createCell(0);
cell1.setCellValue(new HSSFRichTextString("本次会议时间：2009年8月31日 前次会议时间：2009年8月24日"));
cell1.setCellStyle(centerstyle);
// 合并单元格
range = new CellRangeAddress(1, 2, 0, 7);
sheet.addMergedRegion(range);
// 第三行
HSSFRow row2 = sheet.createRow(3);
row2.setHeight((short) 750);
HSSFCell cell = row2.createCell(0);
cell.setCellValue(new HSSFRichTextString("责任者"));
cell.setCellStyle(columnHeadStyle);
cell = row2.createCell(1);
cell.setCellValue(new HSSFRichTextString("成熟度排序"));
cell.setCellStyle(columnHeadStyle);
cell = row2.createCell(2);
cell.setCellValue(new HSSFRichTextString("事项"));
cell.setCellStyle(columnHeadStyle);
cell = row2.createCell(3);
cell.setCellValue(new HSSFRichTextString("前次会议要求/n/新项目的项目概要"));
cell.setCellStyle(columnHeadStyle);
cell = row2.createCell(4);
cell.setCellValue(new HSSFRichTextString("上周工作进展"));
cell.setCellStyle(columnHeadStyle);
cell = row2.createCell(5);
cell.setCellValue(new HSSFRichTextString("本周工作计划"));
cell.setCellStyle(columnHeadStyle);
cell = row2.createCell(6);
cell.setCellValue(new HSSFRichTextString("问题和建议"));
cell.setCellStyle(columnHeadStyle);
cell = row2.createCell(7);
cell.setCellValue(new HSSFRichTextString("备 注"));
cell.setCellStyle(columnHeadStyle);
// 访问数据库，得到数据集
List<DeitelVO> deitelVOList = getEntityManager().queryDeitelVOList();
int m = 4;
int k = 4;
for (int i = 0; i < deitelVOList.size(); i++) {
DeitelVO vo = deitelVOList.get(i);
String dname = vo.getDname();
List<Workinfo> workList = vo.getWorkInfoList();
HSSFRow row = sheet.createRow(m);
cell = row.createCell(0);
cell.setCellValue(new HSSFRichTextString(dname));
cell.setCellStyle(centerstyle);
// 合并单元格
range = new CellRangeAddress(m, m + workList.size() - 1, 0, 0);
sheet.addMergedRegion(range);
m = m + workList.size();
for (int j = 0; j < workList.size(); j++) {
Workinfo w = workList.get(j);
// 遍历数据集创建Excel的行
row = sheet.getRow(k + j);
if (null == row) {
row = sheet.createRow(k + j);
}
cell = row.createCell(1);
cell.setCellValue(w.getWnumber());
cell.setCellStyle(centerstyle);
cell = row.createCell(2);
cell.setCellValue(new HSSFRichTextString(w.getWitem()));
cell.setCellStyle(style);
cell = row.createCell(3);
cell.setCellValue(new HSSFRichTextString(w.getWmeting()));
cell.setCellStyle(style);
cell = row.createCell(4);
cell.setCellValue(new HSSFRichTextString(w.getWbweek()));
cell.setCellStyle(style);
cell = row.createCell(5);
cell.setCellValue(new HSSFRichTextString(w.getWtweek()));
cell.setCellStyle(style);
cell = row.createCell(6);
cell.setCellValue(new HSSFRichTextString(w.getWproblem()));
cell.setCellStyle(style);
cell = row.createCell(7);
cell.setCellValue(new HSSFRichTextString(w.getWremark()));
cell.setCellStyle(style);
}
k = k + workList.size();
}
// 列尾
int footRownumber = sheet.getLastRowNum();
HSSFRow footRow = sheet.createRow(footRownumber + 1);
HSSFCell footRowcell = footRow.createCell(0);
footRowcell.setCellValue(new HSSFRichTextString(" 审 定：XXX 审 核：XXX 汇 总：XX"));
footRowcell.setCellStyle(centerstyle);
range = new CellRangeAddress(footRownumber + 1, footRownumber + 1, 0, 7);
sheet.addMergedRegion(range);
HttpServletResponse response = getResponse();
HttpServletRequest request = getRequest();
String filename = "未命名.xls";//设置下载时客户端Excel的名称
// 请见：http://zmx.javaeye.com/blog/622529
filename = Util.encodeFilename(filename, request);
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment;filename=" + filename);
OutputStream ouputStream = response.getOutputStream();
workbook.write(ouputStream);
ouputStream.flush();
ouputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
实例二 ：
String fileName="EXCEL.xls";
response.reset();//清除buffer。设置页面不缓存
response.setContentType( "application/vnd.ms-excel;charset=GBK");
response.setHeader("Content-disposition","attachment; filename=\"" + fileName + "\"");
request.setCharacterEncoding("GBK");
//银行承兑汇票
Bill[] bankBills = (Bill[])request.getAttribute("bankBills");
//商业承兑汇票
Bill[]commercialBills = (Bill[])request.getAttribute("commercialBills");
HSSFWorkbook wb = new HSSFWorkbook();
HSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式
SimpleDateFormat df = new SimpleDateFormat("yyyy-mm-dd");
HSSFSheet banksheet = wb.createSheet();
wb.setSheetName(0,"银行承兑汇票",HSSFWorkbook.ENCODING_UTF_16);
HSSFRow bankrow0 = banksheet.createRow((int) 0);
//设置表头
HSSFCell bankcell0 = bankrow0.createCell((short) 0);
bankcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
bankcell0.setCellValue("票据流水号");
bankcell0.setCellStyle(style);
bankcell0 = bankrow0.createCell((short) 1);
bankcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
bankcell0.setCellValue("到期日期");
bankcell0.setCellStyle(style);
bankcell0 = bankrow0.createCell((short) 2);
bankcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
bankcell0.setCellValue("当前持有人");
bankcell0.setCellStyle(style);
bankcell0 = bankrow0.createCell((short) 3);
bankcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
bankcell0.setCellValue("票据号码");
bankcell0.setCellStyle(style);
bankcell0 = bankrow0.createCell((short) 4);
bankcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
bankcell0.setCellValue("票面金额");
bankcell0.setCellStyle(style);
bankcell0 = bankrow0.createCell((short) 5);
bankcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
bankcell0.setCellValue("出票人");
bankcell0.setCellStyle(style);
bankcell0 = bankrow0.createCell((short) 6);
bankcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
bankcell0.setCellValue("承兑人");
bankcell0.setCellStyle(style);
bankcell0 = bankrow0.createCell((short) 7);
bankcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
bankcell0.setCellValue("收票人");
bankcell0.setCellStyle(style);
bankcell0 = bankrow0.createCell((short) 8);
bankcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
bankcell0.setCellValue("出票保证人");
bankcell0.setCellStyle(style);
bankcell0 = bankrow0.createCell((short) 9);
bankcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
bankcell0.setCellValue("出票日期");
bankcell0.setCellStyle(style);
//填充数据
if(bankBills!=null){
//填充数据
HSSFRow row;
for(int i=0;i<bankBills.length;i++){
row = banksheet.createRow((int) i + 1);
Bill bill = bankBills[i];
//日期格式
HSSFCellStyle datecellStyle = wb.createCellStyle();
HSSFDataFormat dateformat= wb.createDataFormat();
datecellStyle.setDataFormat(dateformat.getFormat("yyyy-MM-dd"));
//金额格式
HSSFCellStyle cellStyle = wb.createCellStyle();
HSSFDataFormat format= wb.createDataFormat();
cellStyle.setDataFormat(format.getFormat("#,##0.00"));
//票据流水
HSSFCell cell = row.createCell((short) 0);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(bill.getBillId().toString());
//票据到期日
cell= row.createCell((short)1);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellStyle(datecellStyle);
cell.setCellValue(bill.getDueDate());
//当前持有人
String memberName = bankBills[i].getHolderBankAccount()==null?"":
bankBills[i].getHolderBankAccount().getMember()==null?"":
bankBills[i].getHolderBankAccount().getMember().getMemberName();
cell= row.createCell((short)2);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue(memberName);
//票据号
cell= row.createCell((short)3);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(bill.getBillNo());
//票面金额
cell= row.createCell((short)4);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
cell.setCellStyle(cellStyle);
cell.setCellValue(bill.getAmount().doubleValue());
//出票人
cell= row.createCell((short)5);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(bill.getDrawerName());
//承兑人
cell= row.createCell((short)6);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(bill.getAcceptorName());
//收票人
cell= row.createCell((short)7);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(bill.getPayeeName());
//出票保证人
Set suretySet = bankBills[i].getSureties();
Iterator it = suretySet.iterator();
String warr = "";
while(it.hasNext()){
Surety surety = (Surety)it.next();
if(surety.getSuretyMode().intValue() == Integer.valueOf(SureMode.register.getCode()).intValue()){
warr=surety.getWarrantorName();
}
cell= row.createCell((short)8);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(warr);
//出票日期
cell= row.createCell((short)9);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellStyle(datecellStyle);
cell.setCellValue(bill.getIssueDate());
}
}
}
// 填充商业承兑汇票数据
HSSFSheet commercialsheet = wb.createSheet();
wb.setSheetName(1,"商业承兑汇票",HSSFWorkbook.ENCODING_UTF_16);
HSSFRow commercialrow0 = commercialsheet.createRow((int) 0);
//设置表头
HSSFCell commercialcell0 = commercialrow0.createCell((short) 0);
commercialcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
commercialcell0.setCellValue("票据流水号");
commercialcell0.setCellStyle(style);
commercialcell0 = commercialrow0.createCell((short) 1);
commercialcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
commercialcell0.setCellValue("到期日期");
commercialcell0.setCellStyle(style);
commercialcell0 = commercialrow0.createCell((short) 2);
commercialcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
commercialcell0.setCellValue("当前持有人");
commercialcell0.setCellStyle(style);
commercialcell0 = commercialrow0.createCell((short) 3);
commercialcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
commercialcell0.setCellValue("票据号码");
commercialcell0.setCellStyle(style);
commercialcell0 = commercialrow0.createCell((short) 4);
commercialcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
commercialcell0.setCellValue("票面金额");
commercialcell0.setCellStyle(style);
commercialcell0 = commercialrow0.createCell((short) 5);
commercialcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
commercialcell0.setCellValue("出票人");
commercialcell0.setCellStyle(style);
commercialcell0 = commercialrow0.createCell((short) 6);
commercialcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
commercialcell0.setCellValue("承兑人");
commercialcell0.setCellStyle(style);
commercialcell0 = commercialrow0.createCell((short) 7);
commercialcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
commercialcell0.setCellValue("收票人");
commercialcell0.setCellStyle(style);
commercialcell0 = commercialrow0.createCell((short) 8);
commercialcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
commercialcell0.setCellValue("出票保证人");
commercialcell0.setCellStyle(style);
commercialcell0 = commercialrow0.createCell((short) 9);
commercialcell0.setEncoding(HSSFCell.ENCODING_UTF_16);
commercialcell0.setCellValue("出票日期");
commercialcell0.setCellStyle(style);
//填充数据
if(commercialBills!=null){
//填充数据
HSSFRow row;
for(int i=0;i<commercialBills.length;i++){
row = commercialsheet.createRow((int) i + 1);
Bill bill = commercialBills[i];
//日期格式
HSSFCellStyle datecellStyle = wb.createCellStyle();
HSSFDataFormat dateformat= wb.createDataFormat();
datecellStyle.setDataFormat(dateformat.getFormat("yyyy-MM-dd"));
//金额格式
HSSFCellStyle cellStyle = wb.createCellStyle();
HSSFDataFormat format= wb.createDataFormat();
cellStyle.setDataFormat(format.getFormat("#,##0.00"));
//票据流水
HSSFCell cell = row.createCell((short) 0);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(bill.getBillId().toString());
//票据到期日
cell= row.createCell((short)1);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellStyle(datecellStyle);
cell.setCellValue(df.format(bill.getDueDate()));
//当前持有人
String memberName = bankBills[i].getHolderBankAccount()==null?"":
bankBills[i].getHolderBankAccount().getMember()==null?"":
bankBills[i].getHolderBankAccount().getMember().getMemberName();
cell= row.createCell((short)2);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue(memberName);
//票据号
cell= row.createCell((short)3);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(bill.getBillNo());
//票面金额
cell= row.createCell((short)4);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
cell.setCellStyle(cellStyle);
cell.setCellValue(bill.getAmount().doubleValue());
//出票人
cell= row.createCell((short)5);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(bill.getDrawerName());
//承兑人
cell= row.createCell((short)6);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(bill.getAcceptorName());
//收票人
cell= row.createCell((short)7);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(bill.getPayeeName());
//出票保证人
Set suretySet = bankBills[i].getSureties();
Iterator it = suretySet.iterator();
String warr = "";
while(it.hasNext()){
Surety surety = (Surety)it.next();
if(surety.getSuretyMode().intValue() == Integer.valueOf(SureMode.register.getCode()).intValue()){
warr=surety.getWarrantorName();
}
cell= row.createCell((short)8);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(warr);
//出票日期
cell= row.createCell((short)9);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellStyle(datecellStyle);
cell.setCellValue(df.format(bill.getIssueDate()));
}
}
}
OutputStream os=response.getOutputStream();
try{
wb.write(os);
}catch(Exception e){
e.printStackTrace();
}finally{
try {
os.flush();
os.close();
os=null;
response.flushBuffer();
out.clear();
out = pageContext.pushBody();
}catch (IOException e) {
e.printStackTrace();
}
}
实例三：
FileInputStream fis = null;
OutputStream myout = null;
try{
//得到要下载的文件名称
String filename="zhangsan.txt";
//文件存放的路径，合成绝对路径
// String dir = this.getServletContext().getRealPath("/");
String filepath="D:/works/test/src/test/test.java";
//得到这个文件的对象
File file =new File(filepath);
response.reset();
//response的编码方式为.doc下载
response.setContentType("application/text;charset=utf-8");
//写明要下载的文件的大小
response.setContentLength((int)file.length());
//文件名
response.setHeader("Content-Disposition", "attachment; filename=" + filename);
//独处文件的IO流
fis = new FileInputStream(file);
// BufferedReader br = new BufferedReader(new InputStreamReader(fis));
BufferedInputStream buff=new BufferedInputStream(fis);
byte [] b = new byte[1024];//相当读文件的缓存
long k=0;//该值用于计算当前实际下载了多少字节
// int flag = 0;
// //response对象得到输出流
myout = response.getOutputStream();
//
// while( (flag = fis.read(b)) > 0 ){
// myout.write(b);
// }
//开始循环下载
while(k<file.length()){
int j=buff.read(b,0,1024);
k+=j;
//将b中的数据写到客户端的内存
myout.write(b,0,j);
}
//将写入到客户端的内存的数据,刷新到磁盘
myout.flush();
}catch(Exception e){
}finally{
if(fis != null){
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(myout != null){
try {
myout.close();
} catch (IOException e) {
e.printStackTrace();
}
}
try {
response.flushBuffer();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
实例四
--------------------------------------------------------------------------------------------------
String fileName = "d:/qqq.txt";
BufferedReader br = null;
BufferedWriter bw = null;
try {
String loadFileName = "\"" + escapeURL("zhangsan.txt") + "\"";;
//重置输出流
response.reset();
//设置下载框
response.setHeader("Content-disposition", "attachment; filename=" + loadFileName);
//设置文件类型
response.setContentType("text/plain;charset=UTF-8");
br = new BufferedReader(new InputStreamReader(new FileInputStream(fileName)));
bw = new BufferedWriter(new OutputStreamWriter(response.getOutputStream())) ;
String lineStr = null;
while((lineStr = br.readLine()) != null){
bw.write(lineStr);
}
bw.flush();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
if(br != null){
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(bw != null){
try {
bw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
response.flushBuffer();
}
作者：挑战者666888
链接：https://www.jianshu.com/p/217a50bf87a3
來源：简书
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。
