获取的数据生成excel文件且将文件下载到本地

//生成excel文件且导出到本地。

package sundun.jdkp.cakp.util;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.JOptionPane;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFComment;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
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.HSSFColor;

import Entity.Student;

public class testExceport<T> {

   public void exportExcel(Collection<T> testtest, OutputStream out)
   {
   exportExcel("测试导出EXCEL文档", null, testtest, out, "yyyy-MM-dd");
   }

   public void exportExcel(String[] headers, Collection<T> testtest,
   OutputStream out)
   {
   exportExcel("测试导出EXCEL文档", headers, testtest, out, "yyyy-MM-dd");
   }

   public void exportExcel(String[] headers, Collection<T> testtest,
   OutputStream out, String pattern)
   {
   exportExcel("测试导出EXCEL文档", headers, testtest, out, pattern);
   }


   @SuppressWarnings("unchecked")
   public void exportExcel(String title, String[] headers,
   Collection<T> testtest, 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 asd
   sheet.setDefaultColumnWidth((short) 25);
   // 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 = testtest.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))
   {
   // 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();
   }

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

   /**
   * 创建一个学生类，学生类要有默认构造方法，和字段的构造方法。*/
   public static void main(String[] args) {

       testExceport<Student> ex = new testExceport<Student>();
String[] headers =
{ "id", "姓名", "年龄", "性别", "生日" };
List<Student> testtest = new ArrayList<Student>();
testtest.add(new Student(10000001, "s", 20, true, new Date()));
testtest.add(new Student(20000002, "Y", 24, false, new Date()));
testtest.add(new Student(30000003, "的撒法", 22, true, new Date()));

OutputStream out = null;
           try {
               out = new FileOutputStream("D://x.xls");
           } catch (FileNotFoundException e) {

               e.printStackTrace();
           }

ex.exportExcel(headers, testtest, out);

try {
               out.close();
           } catch (IOException e) {

               e.printStackTrace();
           }
JOptionPane.showMessageDialog(null, "成功导出!");
System.out.println("成功导出！");


   }

}
//获取数据到本地，调用上面的方法。我前端是用的ajax方法请求过来的。

@Controller
@RequestMapping(value="/exceport")
public class ExportKPCaseController {

   @Autowired
   private GgKpajService kpajService;
   @RequestMapping(value="/openView")
   public void open(HttpServletRequest req,HttpServletResponse res) throws SQLException, IOException{

       String sql = buildQuerySQL(req, true);
       List<ExportKPCaseEntity> list = null;
       if (StringUtil.isNotEmpty(sql)) {
           // 分页查询结果
           QueryResult<Map<String, Object>> qr = kpajService.getPageDataBySql(
                   sql, 1, 100000000, null, null, null);

List<Map<String, Object>> rowList = qr.getResultList();
list = new ArrayList<ExportKPCaseEntity>();

      //为list添加数据
           for (Map<String, Object> obj : rowList) {
               list.add(new ExportKPCaseEntity((String)(obj.get("ajbh")),(String)(obj.get("ajmc")),(String)(obj.get("zbr_xm")),(String)(obj.get("cbdw_mc")),(String)(obj.get("ajzt")),(String)(obj.get("ajdf"))));
           }

       }
       String[] Headers =
               {"案件编号","案件名称","主办人","主办单位","案件状态","案件得分"};
       testExceport<ExportKPCaseEntity> tt = new testExceport<ExportKPCaseEntity>();
       OutputStream out = null;
       try {
           String u = "D://监督案件.xls";
           out = new FileOutputStream(u);
       } catch (FileNotFoundException e) {

           e.printStackTrace();
       }
       tt.exportExcel(Headers, list,out);
       try {
           out.close();
       } catch (IOException e) {
           e.printStackTrace();
       }

//调用工具类，将刚才生成的excel文件下载到本地。
DownFileUtil.downFile(req, res);
}

//工具类

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

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

public class DownFileUtil {

   public static void downFile(HttpServletRequest request,HttpServletResponse response) throws IOException{

//上传的文件都是保存在/WEB-INF/upload目录下的子目录当中
String fileSaveRootPath=request.getServletContext().getRealPath("//excel//监督案件.xls");
//通过文件名找出文件的所在目录
String realname = "监督案件.xls";

//设置响应头，控制浏览器下载该文件
try {
           response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(realname, "UTF-8"));
       } catch (UnsupportedEncodingException e) {

           e.printStackTrace();
       }
//读取要下载的文件，保存到文件输入流
FileInputStream in = null;
       try {
           in = new FileInputStream(fileSaveRootPath);
       } catch (FileNotFoundException e) {

           e.printStackTrace();
       }
//创建输出流
OutputStream out = response.getOutputStream();
//创建缓冲区
byte buffer[] = new byte[1024];
int len = 0;
//循环将输入流中的内容读取到缓冲区当中
while((len=in.read(buffer))>0){
//输出缓冲区的内容到浏览器，实现文件下载
out.write(buffer, 0, len);
}
//关闭文件输入流
in.close();
//关闭输出流
out.close();
   }
}

获取的数据生成excel文件且将文件下载到本地

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