JAVA WEB ------ 文件下载及导出数据到office Execl表格

文件下载需要五步：

1.设置文件ContentType类型

// 设置文件ContentType类型，这样设置，会自动判断下载文件类型
   response.setContentType("multipart/form-data");  

2.设置文件头

// 设置文件头：最后一个参数是设置下载文件名
   response.addHeader("Content-Disposition", "attachment;filename=" + new String(title.getBytes(),"ISO8859-1") + ".xls");

3.获取输出流(out)

// 获取输出流
   out = res.getOutputStream();

4.写到输出流(out)中

5.关闭资源

--------华丽的分割线-------web项目导出Excel文档

　　POM ：

　　<dependency>
　　　　<groupId>org.apache.poi</groupId>
　　　　<artifactId>poi</artifactId>
　　　　<version>3.15-beta1</version>
　　</dependency>

　　Class ： RestController

package com.xindatai.ibs.device.act;

import java.io.IOException;
import java.io.OutputStream;
import java.util.List;

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

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.xindatai.common.web.BaseAct;
import com.xindatai.common.web.resp.ModelMapWriter;
import com.xindatai.common.web.resp.PageRespWriter;
import com.xindatai.ibs.device.act.bean.PerfReqParam;
import com.xindatai.ibs.device.act.validate.PerfActValidate;
import com.xindatai.ibs.device.bean.PerfPM25;
import com.xindatai.ibs.device.service.PerfService;
import com.xindatai.ibs.util.ExportExcel;

@RestController
public class PerfAct extends BaseAct{

    @Resource
    private PerfService service;
    @Resource
    private PerfActValidate validate;
    @Resource
    private ExportExcel<PerfPM25> exportExcel;

    @RequestMapping(value = "/perf" , method = RequestMethod.GET)
    public String perf(HttpServletRequest req,HttpServletResponse res , PerfReqParam param){
        res.setHeader("Access-Control-Allow-Origin", "*");
        ModelMapWriter writer = new ModelMapWriter();
        validate.perf(param);
        if(param.hasErrors()){
            writer = ModelMapWriter.createErrWriter(param);
        }else{
            if(param.getExport()){
                OutputStream out = null;
                try {
                    String title = "来福士PM2.5浓度监测值统计报表";
                    List<PerfPM25> list = service.getPerfsExport(param);
                    String[] headers = {"监测点","统计时间","PM2.5浓度平均值","温度平均值","湿度平均值"};
                    String[] headersName = {"name","perfTime","pm25","temp","humi"};
//                    设置文件ContentType类型，这样设置，会自动判断下载文件类型
                    res.setContentType("multipart/form-data");
//                    设置文件头：最后一个参数是设置下载文件名
                    res.addHeader("Content-Disposition", "attachment;filename=" + new String(title.getBytes(),"ISO8859-1") + ".xls");
//                    获取输出流
                    out = res.getOutputStream();
                    exportExcel.exportExcel(title, headers, headersName, list, out);
                } catch (IOException e) {
                    e.printStackTrace();
                }finally{
                    try {
                        if(null != null){
                            out.close();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }else{
                PageRespWriter<PerfPM25> query = service.getPerfs(param);
                return toJsonFormatDate(query);
            }
        }
        return toJsonFormatDate(writer);
    }
}

　　Class ： @Service

package com.xindatai.ibs.util;

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

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 org.springframework.stereotype.Service;

@Service
public class ExportExcel<T> {

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

    /*
     * 这是一个通用的方法，利用JAVA的反射机制，可以将放置在JAVA集合中并且符合一定条件的数据以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 headersName 字段数组，用来获取反射方法。
     * @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“yyyy-MM-dd”
     */
    public void exportExcel(String title,String[] headers,String[] headersName, Collection<T> dataset,OutputStream out,String pattern){
//        声明一个工作簿
        HSSFWorkbook workbook = new HSSFWorkbook();
//        声明一个表格
        HSSFSheet sheet = workbook.createSheet(title);
//        设置表格默认列宽度为15个字节
        sheet.setDefaultColumnWidth((short)15);
//        生成一个单元格样式：表头单元格样式
        HSSFCellStyle styleCaptaion = workbook.createCellStyle();
//        设置表头单元格样式：设置单元格背景色
//        styleCaptaion.setFillBackgroundColor(HSSFColor.SKY_BLUE.index);
//        设置表头单元格样式：指定单元格的填充信息模式和纯色填充单元。
//        styleCaptaion.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
//        设置表头单元格样式：设置边框的类型为单元格的右边界
        styleCaptaion.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        styleCaptaion.setBorderTop(HSSFCellStyle.BORDER_THIN);
        styleCaptaion.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        styleCaptaion.setBorderRight(HSSFCellStyle.BORDER_THIN);
//        设置表头单元格样式：设置单元格为水平对齐的类型
        styleCaptaion.setAlignment(HSSFCellStyle.ALIGN_CENTER);
//        生成一个字体：表头字体
        HSSFFont fontCaptaion = workbook.createFont();
//        生成一个字体：设置字体颜色
        fontCaptaion.setColor(HSSFColor.VIOLET.index);
//        生成一个字体：设置字体大小
        fontCaptaion.setFontHeightInPoints((short)12);
//        生成一个字体：字体加粗
        fontCaptaion.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
//        把字体应用到当前单元格样式中
        styleCaptaion.setFont(fontCaptaion);

//        生成内容单元格样式
        HSSFCellStyle styleContent = workbook.createCellStyle();
        styleContent.setFillBackgroundColor(HSSFColor.LIGHT_YELLOW.index);
        styleContent.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        styleContent.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        styleContent.setBorderTop(HSSFCellStyle.BORDER_THIN);
        styleContent.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        styleContent.setBorderRight(HSSFCellStyle.BORDER_THIN);
        styleContent.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        styleContent.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
//        生成内容字体
        HSSFFont fontContent = workbook.createFont();
        fontContent.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
//        把字体应用到内容单元格样式中
        styleContent.setFont(fontContent);

//        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
        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时可以在状态栏中看到该内容
        comment.setAuthor("lime");

//        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(styleCaptaion);
            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()){
            row = sheet.createRow(++index);
            T t = (T)it.next();
            Class<? extends Object> tCls = t.getClass();
            for(short i = 0;i < headers.length;i++){
                HSSFCell cell = row.createCell(i);
                String getterName = "get" + headersName[i].substring(0, 1).toUpperCase() + headersName[i].substring(1);
                Method method = null;
                Object value = null;
                try {
                    method = tCls.getDeclaredMethod(getterName);
                    value = method.invoke(t);
                } catch (NoSuchMethodException e) {
                    e.printStackTrace();
                } catch (SecurityException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                } catch (IllegalArgumentException e) {
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    e.printStackTrace();
                }
                verify(value, cell, row, pattern, sheet, index, patriarch, workbook, i);
            }
        }
        try {
            workbook.write(out);
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            if(null != out){
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public void verify(Object value,HSSFCell cell,HSSFRow row, String pattern, HSSFSheet sheet, int index, HSSFPatriarch patriarch, HSSFWorkbook workbook, int i){
//        判断值的类型后进行强制类型转换
        String textValue = null;
        if(value instanceof Integer){
            int intValue = (Integer)value;
            cell.setCellValue(intValue);
        }else if(value instanceof Float){
            float fValue = (Float)value;
            cell.setCellValue(fValue);
        }else if(value instanceof Double){
            double dValue = (Double)value;
            cell.setCellValue(dValue);
        }else if(value instanceof Long){
            long longValue = (Long)value;
            cell.setCellValue(longValue);
        }else if(value instanceof Boolean){
            boolean bValue = (Boolean)value;
            textValue ="男";
            if(!bValue){
                textValue = "女";
            }
            cell.setCellValue(textValue);
        }else if(value instanceof Date){
            Date date = (Date)value;
            SimpleDateFormat sdf = new SimpleDateFormat(pattern);
            textValue = sdf.format(date);
            cell.setCellValue(textValue);
        }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{
//            其他数据类型都当作字符串简单处理
            if(null == value){
                value = "未知区域";
            }
            textValue = value.toString();
        }
//        如果不是图片数据，就利用正则表达式判断textValue是否全部有数字组成
        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);
            }
        }
    }

}

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