java导出excel方法 小记

在web开发中，有一个经典的功能，就是数据的导入导出。特别是数据的导出，在生产管理或者财务系统中用的非常普遍，因为这些系统经常要做一些报表打印的工作。而数据导出的格式一般是EXCEL或者PDF，我这里就用两篇文章分别给大家介绍下。（注意，我们这里说的数据导出可不是数据库中的数据导出！么误会啦^_^）
呵呵，首先我们来导出EXCEL格式的文件吧。现在主流的操作Excel文件的开源工具有很多,用得比较多的就是Apache的POI及JExcelAPI。这里我们用Apache POI！我们先去Apache的大本营下载POI的jar包：http://poi.apache.org/ ，我这里使用的是3.0.2版本。

首先是实体类：

package com.jewery.bean;

public class ExportjeweryBean {
private String jeweryNo;
private String jeweryName;
private String jeweryValue;
private String startTimeStr;
private String endTimeStr;
private String limitOrderAmount;
private String minOrderAmount;
public String getjeweryNo() {
return jeweryNo;
}
public void setjeweryNo(String jeweryNo) {
this.jeweryNo = jeweryNo;
}
public String getjeweryName() {
return jeweryName;
}
public void setjeweryName(String jeweryName) {
this.jeweryName = jeweryName;
}
public String getjeweryValue() {
return jeweryValue;
}
public void setjeweryValue(String jeweryValue) {
this.jeweryValue = jeweryValue;
}
public String getStartTimeStr() {
return startTimeStr;
}
public void setStartTimeStr(String startTimeStr) {
this.startTimeStr = startTimeStr;
}
public String getEndTimeStr() {
return endTimeStr;
}
public void setEndTimeStr(String endTimeStr) {
this.endTimeStr = endTimeStr;
}
public String getLimitOrderAmount() {
return limitOrderAmount;
}
public void setLimitOrderAmount(String limitOrderAmount) {
this.limitOrderAmount = limitOrderAmount;
}
public String getMinOrderAmount() {
return minOrderAmount;
}
public void setMinOrderAmount(String minOrderAmount) {
this.minOrderAmount = minOrderAmount;
}

}

上面这两个类一目了然，就是两个简单的javabean风格的类。

添加一个生成excel头部的工具类：

package com.jewery.util.excel;

public class CellInfo {

private String fieldName;
private String cellName;
private String datePattern = "yyyy-MM-dd";
private int width = 5000;

public CellInfo(String fieldName, String cellName) {
super();
this.fieldName = fieldName;
this.cellName = cellName;
}

public CellInfo(String fieldName, String cellName, String datePattern) {
super();
this.fieldName = fieldName;
this.cellName = cellName;
this.datePattern = datePattern;
}

public CellInfo(String fieldName, String cellName, String datePattern, int width) {
super();
this.fieldName = fieldName;
this.cellName = cellName;
this.width = width;
this.datePattern = datePattern;
}

public CellInfo(String fieldName, String cellName, int width) {
super();
this.fieldName = fieldName;
this.cellName = cellName;
this.width = width;
}

public String getFieldName() {
return fieldName;
}

public void setFieldName(String fieldName) {
this.fieldName = fieldName;
}

public String getCellName() {
return cellName;
}

public void setCellName(String cellName) {
this.cellName = cellName;
}

public int getWidth() {
return width;
}

public void setWidth(int width) {
this.width = width;
}

public String getDatePattern() {
return datePattern;
}

public void setDatePattern(String datePattern) {
this.datePattern = datePattern;
}

}

导出的工具类：

package com.jewery.util.excel;

import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.Region;

import com.ibm.icu.text.SimpleDateFormat;

public class ExcelOpt {

private HSSFWorkbook wb;
private HSSFSheet sheet;

public <T> void exportHttpExcel(HttpServletResponse response, String encodeFileName, String titleName, List<CellConfigInfo> configs, List<T> datas) throws Exception {
response.reset();
response.setHeader("Content-Disposition", "attachment;filename=" + encodeFileName + ".xls");// 指定下载的文件名
response.setContentType("application/vnd.ms-excel");
OutputStream output = response.getOutputStream();
this.exportExcel(output, titleName, configs, datas);
}

public String encodeFileName(HttpServletRequest request, String filename) throws Exception {
if (request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") > 0) {
filename = URLEncoder.encode(filename, "UTF-8");// IE浏览器
} else {
filename = new String(filename.getBytes("UTF-8"), "ISO8859-1");// firefox浏览器
}
return filename;
}

public <T> void exportExcel(OutputStream output, String titleName, List<CellConfigInfo> configs, List<T> datas) throws Exception {
wb = new HSSFWorkbook();
sheet = wb.createSheet(titleName);
for (int i = 0; i < configs.size(); i++) {
sheet.setColumnWidth(i, configs.get(i).getWidth());
}
int startRow = 0;
startRow += createTitle(titleName, configs.size());
// 创建单元格样式
startRow += createHead(configs);
// 循环创建中间的单元格的各项的值

HSSFCellStyle cellstyle = wb.createCellStyle();
for (int i = 0; i < datas.size(); i++) {
HSSFRow row = sheet.createRow((short) (startRow + i));
// 设置行高
row.setHeight((short) 500);
T data = datas.get(i);
for (int j = 0; j < configs.size(); j++) {
HSSFCell cell = row.createCell((short) j);
cell.setCellType(HSSFCell.ENCODING_UTF_16);
cellstyle.setAlignment(HSSFCellStyle.ALIGN_CENTER_SELECTION);
cell.setCellStyle(cellstyle);
// cell.setCellValue(new HSSFRichTextString("data"));
setValue(cell, configs.get(j), data);
}
//
}
output.flush();
wb.write(output);
output.close();
}

private <T> void setValue(HSSFCell cell, CellConfigInfo config, T data) throws NoSuchMethodException, SecurityException, IllegalAccessException,
IllegalArgumentException, InvocationTargetException {
String methodName = "get" + config.getFieldName().substring(0, 1).toUpperCase() + config.getFieldName().substring(1);
Method getMethod = data.getClass().getMethod(methodName, new Class[] {});
Class<?> returnType = getMethod.getReturnType();
Object filedData = getMethod.invoke(data, new Object[] {});
if (returnType.getName().equals("java.util.Date")) {
SimpleDateFormat sf = new SimpleDateFormat(config.getDatePattern());
String formatDate = sf.format((java.util.Date) filedData);
cell.setCellValue(new HSSFRichTextString(formatDate));
} else {
cell.setCellValue(new HSSFRichTextString(filedData.toString()));
}
}

public int createHead(List<CellConfigInfo> configs) {
// 创建单元格样式
HSSFCellStyle cellStyle = wb.createCellStyle();

// 指定单元格居中对齐
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 指定单元格垂直居中对齐
cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

// 指定当单元格内容显示不下时自动换行
cellStyle.setWrapText(true);

// 设置单元格字体
HSSFFont font = wb.createFont();
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
font.setFontName("宋体");
font.setFontHeight((short) 200);
cellStyle.setFont(font);

HSSFRow row2 = sheet.createRow(1);
// 设置行高
row2.setHeight((short) 1000);

HSSFCell cell0;

for (int i = 0; i < configs.size(); i++) {
cell0 = row2.createCell(i);
cell0.setCellStyle(cellStyle);
cell0.setCellValue(new HSSFRichTextString(configs.get(i).getCellName()));
}
return 1;
}

public int createTitle(String headString, int colSum) {
HSSFRow row = sheet.createRow(0);
// 设置第一行
HSSFCell cell = row.createCell(0);
row.setHeight((short) 400);
// 定义单元格为字符串类型
cell.setCellType(HSSFCell.ENCODING_UTF_16);
cell.setCellValue(new HSSFRichTextString(headString));
// 指定合并区域
sheet.addMergedRegion(new Region(0, (short) 0, 0, (short) (colSum - 1)));
HSSFCellStyle cellStyle = wb.createCellStyle();
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 指定单元格居中对齐
cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 指定单元格垂直居中对齐
cellStyle.setWrapText(true);// 指定单元格自动换行
// 设置单元格字体
HSSFFont font = wb.createFont();
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
font.setFontName("宋体");
font.setFontHeight((short) 300);
cellStyle.setFont(font);
cell.setCellStyle(cellStyle);
return 1;
}

}

调用：

<a class="btn btn-xs btn-success" href="${ctx}/catering/jewery/exportJewery/{{jewery.id}}" >
<i class="icon-th"></i>
导出
</a>

这里要用a标签，开始我是用的button进行ajax提交的相应的值毫无疑问就是乱码

controller：

@RequestMapping("/exportjewery/{id}")
public void exportjewery(@PathVariable String id,HttpServletRequest request,HttpServletResponse response) throws UnsupportedEncodingException{
request.setCharacterEncoding("utf-8");
try {
if(id == null){
id = "";
}
List<ExportjeweryBean> jeweryBeans = dishesjeweryService.findAllexportJewery(id);
List<CellInfo> configs = new ArrayList<CellInfo>(){
private static final long serialVersionUID = 1L;
{
add(new CellInfo("jeweryName", "名称"));
add(new CellInfo("jeweryNo", "号", 6000));
add(new CellInfo("jeweryValue", "面值"));
add(new CellInfo("minOrderAmount", "金额"));
add(new CellInfo("startTimeStr", "起始时间"));
add(new CellInfo("endTimeStr", "截止时间"));
}
};
ExcelOpt opt = new ExcelOpt();
opt.exportHttpExcel(response, excelOpt.encodeFileName(request, "优惠券列表"), "优惠券列表", configs, jeweryBeans);
dto.message = "导出信息成功";
} catch (Exception e) {
e.printStackTrace();
}
}