利用POI操作excel

package com.syzton.question.util;


import java.io.*;
import java.lang.reflect.*;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.Map.Entry;
import java.util.regex.*;


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


public class ExportExcel<T> {
public void exportExcel(String sheetName,Collection<T> dataset, OutputStream out) {
exportExcel(sheetName, null, dataset, out, "yyyy-MM-dd");
}


public void exportExcel(String sheetName,String[] headers, Collection<T> dataset,
OutputStream out) {
exportExcel(sheetName, headers, dataset, out, "yyyy-MM-dd hh:mm:ss");
}


public void exportExcel(String[] headers, Collection<T> dataset,
OutputStream out, String pattern,String sheetName) {
exportExcel(sheetName, headers, dataset, out, pattern);
}
public void exportExcels(String sheetName,String[] headers,String[] headerKey, Collection<Map> dataset,
OutputStream out) {
exportExcels(sheetName, headers, headerKey,dataset, out, "yyyy-MM-dd hh:mm:ss");
}
/**
* 这是一个通用的方法,利用了JAVA的反射机制,可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上

* @param title
*            表格标题名
* @param headers
*            表格属性列名数组
* @param dataset
*            需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的
*            javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
* @param out
*            与输出设备关联的流对象,可以将EXCEL文档导出到本地文件或者网络中
* @param pattern
*            如果有时间数据,设定输出格式。默认为"yyy-MM-dd"
*/
@SuppressWarnings("unchecked")
public void exportExcel(String title, String[] headers,
Collection<T> dataset, OutputStream out, String pattern) {
// 声明一个工作薄
HSSFWorkbook workbook = new HSSFWorkbook();
// 生成一个表格
HSSFSheet sheet = workbook.createSheet(title);
// 设置表格默认列宽度为15个字节
sheet.setDefaultColumnWidth((short) 30);
// 生成一个样式
HSSFCellStyle style = workbook.createCellStyle();
// 设置这些样式
style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 生成一个字体
HSSFFont font = workbook.createFont();
font.setColor(HSSFColor.VIOLET.index);
font.setFontHeightInPoints((short) 12);
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
// 把字体应用到当前的样式
style.setFont(font);
// 生成并设置另一个样式
HSSFCellStyle style2 = workbook.createCellStyle();
style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
// 生成另一个字体
HSSFFont font2 = workbook.createFont();
font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式
style2.setFont(font2);


// 声明一个画图的顶级管理器
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
// 定义注释的大小和位置,详见文档
HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
0, 0, 0, (short) 4, 2, (short) 6, 5));
// 设置注释内容
comment.setString(new HSSFRichTextString("可以在POI中添加注释!"));
// 设置注释作者,当鼠标移动到单元格上是可以在状态栏中看到该内容.
comment.setAuthor("leno");


// 产生表格标题行
HSSFRow row = sheet.createRow(0);
for (short i = 0; i < headers.length; i++) {
HSSFCell cell = row.createCell(i);
cell.setCellStyle(style);
HSSFRichTextString text = new HSSFRichTextString(headers[i]);
cell.setCellValue(text);
}
// 遍历集合数据,产生数据行
Iterator<T> it = dataset.iterator();
int index = 0;
while (it.hasNext()) {
index++;
row = sheet.createRow(index);
T t = (T) it.next();
// 利用反射,根据javabean属性的先后顺序,动态调用getXxx()方法得到属性值
Field[] fields = t.getClass().getDeclaredFields();
for (short i = 0; i < fields.length; i++) {
HSSFCell cell = row.createCell(i);
cell.setCellStyle(style2);
Field field = fields[i];
String fieldName = field.getName();
String getMethodName = "get"
+ fieldName.substring(0, 1).toUpperCase()
+ fieldName.substring(1);
try {
Class tCls = t.getClass();
Method getMethod = tCls.getMethod(getMethodName,
new Class[] {});
Object value = getMethod.invoke(t, new Object[] {});
// 判断值的类型后进行强制类型转换
String textValue = null;
if (value instanceof Boolean) {
boolean bValue = (Boolean) value;
textValue = "男";
if (!bValue) {
textValue = "女";
}
} else if (value instanceof Date) {
Date date = (Date) value;
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
textValue = sdf.format(date);
} else if (value instanceof byte[]) {
// 有图片时,设置行高为60px;
row.setHeightInPoints(60);
// 设置图片所在列宽度为80px,注意这里单位的一个换算
sheet.setColumnWidth(i, (short) (35.7 * 80));
// sheet.autoSizeColumn(i);
byte[] bsValue = (byte[]) value;
HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,
1023, 255, (short) 6, index, (short) 6, index);
anchor.setAnchorType(2);
patriarch.createPicture(anchor, workbook.addPicture(
bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
}else if(value==null || "".equals(value)){
textValue = "0";
}else {
// 其它数据类型都当作字符串简单处理
textValue = value.toString();
}
// 如果不是图片数据,就利用正则表达式判断textValue是否全部由数字组成
if (textValue != null) {
Pattern p = Pattern.compile("^//d+(//.//d+)?$");
Matcher matcher = p.matcher(textValue);
if (matcher.matches()) {
// 是数字当作double处理
cell.setCellValue(Double.parseDouble(textValue));
} else {
HSSFRichTextString richString = new HSSFRichTextString(
textValue);
HSSFFont font3 = workbook.createFont();
font3.setColor(HSSFColor.BLUE.index);
richString.applyFont(font3);
cell.setCellValue(richString);
}
}
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} finally {
// 清理资源
}

}
try {
workbook.write(out);
} catch (IOException e) {
e.printStackTrace();
}
}


@SuppressWarnings("unchecked")
public void exportExcels(String title, String[] headerName,String[] headerKey,
Collection<Map> dataset, OutputStream out, String pattern) {
if(headerKey == null){
headerKey = headerName;
}
// 声明一个工作薄
HSSFWorkbook workbook = new HSSFWorkbook();
// 生成一个表格
HSSFSheet sheet = workbook.createSheet(title);
// 设置表格默认列宽度为15个字节
sheet.setDefaultColumnWidth((short) 30);
// 生成一个样式
HSSFCellStyle style = workbook.createCellStyle();
// 设置这些样式
style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 生成一个字体
HSSFFont font = workbook.createFont();
font.setColor(HSSFColor.VIOLET.index);
font.setFontHeightInPoints((short) 12);
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
// 把字体应用到当前的样式
style.setFont(font);
// 生成并设置另一个样式
HSSFCellStyle style2 = workbook.createCellStyle();
style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
// 生成另一个字体
HSSFFont font2 = workbook.createFont();
font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式
style2.setFont(font2);


// 声明一个画图的顶级管理器
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
// 定义注释的大小和位置,详见文档
HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
0, 0, 0, (short) 4, 2, (short) 6, 5));
// 设置注释内容
comment.setString(new HSSFRichTextString("可以在POI中添加注释!"));
// 设置注释作者,当鼠标移动到单元格上是可以在状态栏中看到该内容.
comment.setAuthor("leno");


// 产生表格标题行
HSSFRow row = sheet.createRow(0);
for (short i = 0; i < headerName.length; i++) {
HSSFCell cell = row.createCell(i);
cell.setCellStyle(style);
HSSFRichTextString text = new HSSFRichTextString(headerName[i]);
cell.setCellValue(text);
}
// 遍历集合数据,产生数据行
int index = 0;
try {
for(Iterator it = dataset.iterator(); it.hasNext();) { 
index ++;
row = sheet.createRow(index);
Map<String,Object> map = (Map) it.next(); 
try {
String textvalue = null;
for(int i = 0;i<headerKey.length;i++){
HSSFCell cell = row.createCell(i);
Object obj = map.get(headerKey[i]);
if(obj!=null&&!"".equals(obj)){
textvalue = obj.toString();
}else{
textvalue = "没有此项内容";
}
cell.setCellValue(new HSSFRichTextString(textvalue));
}

} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
//清理资源
}
try {
workbook.write(out);
} catch (IOException e) {
e.printStackTrace();
}
}


}


调用方式:

   public void exportSheets3(HttpServletRequest request,
            HttpServletResponse response)throws Exception {
HttpSession session = request.getSession();
Map map = new HashMap();
map.put("bookId", session.getAttribute("book_id"));
map.put("objective_type", request.getParameter("type"));
map.put("subject_type", session.getAttribute("subject_type"));
List<Map> allQustion=questionService.getQuestionExcle(map);
        String haders[] = new String []{"索书号", "序号","题目", "选项", "选项内容","正确答案","试题类型","出题时间","能力维度","二级指标","模型"};
        String haderKey[] = new String []{"isbn", "id","topic", "tag", "content","trueAnswer","objective_type","creation_time","name1","name2","name3"};
        ExportExcel<Map> ex = new ExportExcel<>();
        String filename ="题目模版.xls";
        String sheetName ="subjective";
        response.setContentType("application/ms-excel;charset=UTF-8");
        response.setHeader("Content-Disposition", "attachment;filename="
                .concat(String.valueOf(URLEncoder.encode(filename, "UTF-8"))));
        OutputStream out = response.getOutputStream();
        try {
        ex.exportExcels(sheetName, haders,haderKey, allQustion, out);
            System.out.println("success");
        } catch (Exception e) {
        e.printStackTrace();
            System.out.println("error");
        }finally{
            out.close();
        }
    }








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转载自blog.csdn.net/qq_31546841/article/details/80234722