1:設定瀏覽器儲存excel檔案格式
response.setContentType("application/vnd.ms-excel");
2:設定匯出的檔名稱
response.setHeader("content-disposition", "attachment;filename=" + fileName + ".xls");

Workbook workbook = exportService.exportFile(request, student);
        OutputStream out = null;
        try {
        out = response.getOutputStream();
        workbook.write(out);
        } catch (IOException e) {


        } finally {
        try {
        out.flush();
        out.close();
        } catch (Exception e) {}
        }
 

public Workbook exportFile(HttpServletRequest request, Student student) {
        int count = 0;
        Workbook workbook = new HSSFWorkbook();
//設定sheet名稱
        Sheet sheet = workbook.createSheet();
        workbook.setSheetName(0, "學生列表");
        ExportExcelUtil excelUtil = new ExportExcelUtil(workbook, sheet);
        // 建立EXCEL表頭資訊
        // 表頭（假定有四列）
        String[] headTittles = null;
            headTittles = new String[] {
                "學號","姓名","年齡","性別"
            };
// 設定各列寬度
        short[] studentWidths = new short[] {
            1000 * 8, 1000 * 8, 1000 * 8, 1000 * 8
        };
        Map<String, Object> properties = getPropertiesStudent(request, student);
//設定按學號升序排列取出資料
        LinkedHashMap<String, String> orderBy = new LinkedHashMap<String, String>();
        orderBy.put("id", "asc");
//取出所有滿足條件的資料
        List<Student> students = studentDao.getStudentByMap(properties, orderBy);
        if (students  != null && students .size() > 0) {
            //建立EXCEL表頭
            excelUtil.createHeaderRow(orderHeadTittles, count++);
//迴圈每個物件
            for (Student student: students) {
            //獲取總列數
                String[] commRowValues = new String[headTittles.length];
//迴圈每個物件的四個屬性
                for (int i = 0; i < commRowValues.length; i++) {
                    String property = headTittles[i];
                    if ("學號".equals(property)) {
                        commRowValues[i] = UtilCommon.getString(student.getId());
                    }else if ("姓名".equals(property)) {
                        commRowValues[i] = UtilCommon.getString(student.getName());
                    }else if ("年齡".equals(property)) {
                        commRowValues[i] = UtilCommon.getString(stuent.getAge());
                    }else if ("性別".equals(property)) {
                        commRowValues[i] = UtilCommon.getString(student.getSex());
}                       
            }
//增加新的一行
excelUtil.createCommonRow(commRowValues, count++);
}
                
            }
        // 調整列寬
        for (int i = 0; i < studentWidths.length; i++) {
            sheet.setColumnWidth(i, studentWidths[i]);
        }
        return workbook;
}
 

private Map<String, Object> getPropertiesStudent(HttpServletRequest request, Student student) {
        // id
        String id = UtilCommon.getString(request.getParameter("id"));        
        // 姓名
        String name = UtilCommon.getString(request.getParameter("name")); 
        // 年齡
        String age = UtilCommon.getString(request.getParameter("age"));
        // 性別
        String sex = UtilCommon.getString(request.getParameter("sex"));
        
        Map<String, Object> properties = new HashMap<String, Object>();
        if (!"".equals(id)) {
            int id = 0;
            try{
                id = Integer.valueOf(id);
            }catch (Exception e){


            }
            properties.put("id", id);
        }


        if (!"".equals(name)) {
            properties.put("name", name);
        }
        if (!"".equals(age)) {
            properties.put("age", Integer.valueOf(age));
        }
        if (!"".equals(sex)) {
   properties.put("sex", sex);
}
        
        return properties;
    } 
 

public List getStudentsByMap(Map<String, Object> properties,LinkedHashMap<String, String> orderBy){
    List<Object> objs = new ArrayList<Object>();
        String queryStr = this.getQueryStrStudent(properties, objs);
        
        String orderStr = WebTool.buildOrderBy(orderBy);
        return this.getHibernateTemplate().find(queryStr + orderStr,
                objs.toArray());
    }

public String getQueryStrStudent(Map<String, Object> properties, List<Object> objs) {
        StringBuilder builder = new StringBuilder();
        builder.append("select xxx  Student(entry.id,entry.name,entry.age,entry.sex) from Stuent as entry where 1=1");
        if (properties != null) {
            // ID
            if (properties.containsKey("id")) {
                if (!"".equals(UtilCommon.getString(properties.get("id")))) {
                String ids = UtilCommon.getString(properties.get("id"));
                String[] arrStudentId = ids.split(",");
                builder.append(" and ( ");
                for (int i = 0; i < arrStudentId.length; i++) {
                if (i==0) {
builder.append("entry.id ="+arrStudentId[i]+"");
}else {
builder.append(" or entry.id="+arrStudentId[i]+"");
}
}
                builder.append(" ) ");
                } else {
                    builder.append(" and entry.id is null ");
                }
           }
            // 姓名 
            if (properties.containsKey("name")) {
                if (!"".equals(UtilCommon.getString(properties.get("name")))) {
                String name = UtilCommon.getString(properties.get("name"));
                String[] arrname = name.split(",");
                builder.append(" and ( ");
                for (int i = 0; i < arrname.length; i++) {
                if (i==0) {
builder.append("entry.name = ?");
objs.add(arrmobile[i]);
}else {
builder.append(" or entry.name = ? ");
                        objs.add(arrmobile[i]);
}
}                
                    builder.append(" ) ");
                }
            }
            
          
            // 年齡 
            if (properties.containsKey("age")) {
                String strage = UtilCommon.getString(properties.get("age"));
                if (!"".equals(strage)) {
                    long id = 0;
                    try{
                        age = Long.valueOf(strage);
                    }catch (Exception e){


                    }
                    builder.append(" and entry.age = ? ");
                    objs.add(age);
                } else {
                    builder.append(" and entry.age is null ");
                }
            }
            // 性別 
            if (properties.containsKey("sex")) {
                if (!"".equals(UtilCommon.getString(properties.get("sex")))) {
                    builder.append(" and entry.sex = ? ");
                    objs.add(properties.get("sex"));
                } else {
                    builder.append(" and entry.sex is null ");
                }
            }
        }
        return builder.toString();
    }

public ExportExcelUtil(Workbook workbook, Sheet sheet) {
this.wb = workbook;
this.sheet = sheet;


// 設定單元格樣式
cellstyledefault = wb.createCellStyle();
// 水平居中對齊
cellstyledefault.setAlignment(CellStyle.ALIGN_CENTER);
// 垂直居中對齊
cellstyledefault.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
// 設定單元格自動換行
cellstyledefault.setWrapText(true);


// 設定單元格字型
Font font = wb.createFont();
font.setFontName("宋體");
font.setFontHeight((short) 250);
cellstyledefault.setFont(font);
}

 public static String buildOrderBy(LinkedHashMap<String, String> orderBy) {
        StringBuffer orderBySql = new StringBuffer();


        if (null != orderBy && orderBy.size() > 0) {
            orderBySql.append(" order by ");
            for (String key: orderBy.keySet()) {
                orderBySql.append(key).append(" ").append(orderBy.get(key)).append(",");
            }
            // 刪除多餘的一個逗號
            orderBySql.deleteCharAt(orderBySql.length() - 1);
        }
        return orderBySql.toString();
    }