ExtJS實現Excel導出

1． 使用POI組件實現excel導出功能

//獲取問題列表

List<Suggestion> targetStockList = suggestionService.getSuggestionList(map);
 
        //建立一個新的Excel
        HSSFWorkbook workBook = new HSSFWorkbook();
        //建立sheet頁
        HSSFSheet sheet = workBook.createSheet();
        //sheet頁名稱
        workBook.setSheetName(0, "targetStockList");
        //建立header頁
        HSSFHeader header = sheet.getHeader();
        //設置標題居中
        header.setCenter("標題");
        
        //設置第一行爲Header
        HSSFRow row = sheet.createRow(0);
        HSSFCell cell0 = row.createCell(Short.valueOf("0"));
        HSSFCell cell1 = row.createCell(Short.valueOf("1"));
        HSSFCell cell2 = row.createCell(Short.valueOf("2"));
 
        
        // 設置字符集
        cell0.setEncoding(HSSFCell.ENCODING_UTF_16);
        cell1.setEncoding(HSSFCell.ENCODING_UTF_16);
        cell2.setEncoding(HSSFCell.ENCODING_UTF_16);
        
        cell0.setCellValue("問題標題");
        cell1.setCellValue("問題描述");
        cell2.setCellValue("反饋時間");
    
        
        if(targetStockList != null && !targetStockList.isEmpty()) {
            for(int i = 0; i < targetStockList.size(); i++) {
                Suggestion targetStock = targetStockList.get(i);
                row = sheet.createRow(i + 1);
                cell0 = row.createCell(Short.valueOf("0"));
                cell1 = row.createCell(Short.valueOf("1"));
                cell2 = row.createCell(Short.valueOf("2"));
                
                // 設置字符集
                cell0.setEncoding(HSSFCell.ENCODING_UTF_16);
                cell1.setEncoding(HSSFCell.ENCODING_UTF_16);
                cell2.setEncoding(HSSFCell.ENCODING_UTF_16);
                
                cell0.setCellValue(targetStock.getType());
                cell1.setCellValue(targetStock.getContent());
                cell2.setCellValue(targetStock.getPublishTime());
     
 
                
                sheet.setColumnWidth((short) 0, (short) 4000);
                sheet.setColumnWidth((short) 1, (short) 4000);
                sheet.setColumnWidth((short) 2, (short) 4000);
            }
        }
        
        //經過Response把數據以Excel格式保存
        response.reset();
        response.setContentType("application/msexcel;charset=UTF-8");
        try {
            response.addHeader("Content-Disposition", "attachment;filename=\""
                    + new String(("用戶意見信息表" + ".xls").getBytes("GBK"),
                            "ISO8859_1") + "\"");
            OutputStream out = response.getOutputStream();
            workBook.write(out);
            out.flush();
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;

2.ExtJS調用此函數，實現Excel的導出

咱們知道在界面上經過一個按鈕實現Excel的導出，ExtJS的按鈕通常都是經過Ext.Ajax.request的異步請求實現數據提交的。可是在這裏咱們不能使用異步調用，咱們須要在直接提示給用戶是否保存或打開此文檔。如何實現呢？

       其實很簡單，咱們若是瞭解了ExtJS就是Javascript開發的，咱們就可以很容易實現此功能了。咱們在按鈕的觸發事件中寫入此段代碼就能實現Excel的函數調用了。

    // 初始化 Excel導出 的按鈕

    var exportExcel = Ext.get('exportExcel');
    exportExcel.on('click', exportButtonClick);
    
    function exportButtonClick (){
         window.location.href = Ext.CONTEXT + '/admin/suggestion.do?method=exportTargetList';
};