在平常的開發中我們常常遇到不僅僅只是導出excel報表的情況。有時候也需要導出pdf或者CSV報表。其實原理都差不多。剛開始本來不打算也這篇博客介紹這個的。感覺這篇博客和前面的博客有點雷同。原理基本都一樣。但想了想。有時候可能有些童鞋遇到這樣的需求會無從下手。所以還是記錄下來。幫助一下那些需要這個需求的童鞋。如果你對前面幾篇博客的原理都搞明白了。這篇博客你完全可以不看了。僅僅只是代碼的實現不同而已。好了。下面我們來看一下需求吧。

這個圖就是我們的需求

? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

? ? ?就像你看到的一樣。我們的需求就是列表內容是從數據庫中讀出來的。而我們想把從數據庫得到的這個列表導出pdf、csv、excel報表。也不多說了。看代碼吧：

[java]?view plaincopy print?

<pre?code_snippet_id="630890"?snippet_file_name="blog_20150329_1_746209"?name="code"?class="java">package?com.bzu.csh;??

??

import?java.io.ByteArrayOutputStream;??

import?java.io.File;??

import?java.io.FileOutputStream;??

import?java.io.OutputStream;??

import?java.util.ArrayList;??

import?java.util.List;??

??

import?javax.servlet.http.HttpServletRequest;??

import?javax.servlet.http.HttpServletResponse;??

??

import?jxl.Workbook;??

import?jxl.write.Label;??

import?jxl.write.WritableFont;??

import?jxl.write.WritableSheet;??

import?jxl.write.WritableWorkbook;??

??

import?org.apache.struts2.ServletActionContext;??

??

import?com.lowagie.text.Document;??

import?com.lowagie.text.Element;??

import?com.lowagie.text.Font;??

import?com.lowagie.text.PageSize;??

import?com.lowagie.text.Paragraph;??

import?com.lowagie.text.pdf.PdfPTable;??

import?com.lowagie.text.pdf.PdfWriter;??

import?com.opensymphony.xwork2.Action;??

??

public?class?downloadAction?implements?Action?{??

??

????private?String?downType;??

??

????public?String?getDownType()?{??

????????return?downType;??

????}??

??

????public?void?setDownType(String?downType)?{??

????????this.downType?=?downType;??

????}??

??

????public?String?execute()?{??

????????//?TODO?Auto-generated?method?stub??

????????HttpServletRequest?request?=?ServletActionContext.getRequest();??

????????//HttpServletResponse?response?=?ServletActionContext.getResponse();??

????????//此處模擬數據庫讀出的數據。在真正的項目中。我們可以通過在session中保存的前端數據集合替換這里??

????????List<Person>?list?=?new?ArrayList<Person>();??

????????for?(int?i?=?1;?i?<?6;?i++)?{??

????????????Person?person?=?new?Person();??

????????????person.setId(String.valueOf(i));??

????????????person.setName(String.valueOf((char)?(i?+?64)));??

????????????person.setAge(i?+?20);??

????????????person.setSex("man");??

????????????list.add(person);??

????????}??

????????OutputStream?os?=?null;??

????????String?fname?=?"personlist";??

????????if?("PDF".equals(downType))?{??

????????????try?{??

????????????//??response.reset();??

????????????//??os?=?response.getOutputStream();??

????????????????FileOutputStream?out?=?new?FileOutputStream("d://a.pdf");??

????????????????Document?document?=?new?Document(PageSize.A4,?50,?50,?50,?50);??

????????????//??response.setContentType("application/pdf");??

????????????//??response.setHeader("Content-disposition",??

????????????//??????????"attachment;filename="?+?fname?+?".pdf");??

????????????????ByteArrayOutputStream?baos?=?new?ByteArrayOutputStream();??

??

????????????????PdfWriter.getInstance(document,?out);??

????????????????document.open();??

????????????????int?cols?=?list.size();??

????????????????//?創建PDF表格??

????????????????PdfPTable?table?=?new?PdfPTable(4);??

????????????????//?設置pdf表格的寬度??

????????????????table.setTotalWidth(500);??

????????????????//?設置是否要固定其寬度??

????????????????table.setLockedWidth(true);??

????????????????//?表頭字體??

????????????????Font?thfont?=?new?Font();??

????????????????//?設置表頭字體的大小??

????????????????thfont.setSize(7);??

????????????????//?設置表頭字體的樣式??

????????????????thfont.setStyle(Font.BOLD);??

????????????????Font?tdfont?=?new?Font();??

????????????????tdfont.setSize(7);??

????????????????tdfont.setStyle(Font.NORMAL);??

????????????????//?設置水平對齊方式??

????????????????table.setHorizontalAlignment(Element.ALIGN_MIDDLE);??

????????????????//?設置table的header??

????????????????table.addCell(new?Paragraph("id",?thfont));??

????????????????table.addCell(new?Paragraph("name",?thfont));??

????????????????table.addCell(new?Paragraph("sex",?thfont));??

????????????????table.addCell(new?Paragraph("age",?thfont));??

????????????????//?循環設置table的每一行??

????????????????for?(int?i?=?0;?i?<?list.size();?i++)?{??

????????????????????Person?p?=?(Person)?list.get(i);??

????????????????????table.addCell(new?Paragraph(p.getId(),?tdfont));??

????????????????????table.addCell(new?Paragraph(p.getName(),?tdfont));??

????????????????????table.addCell(new?Paragraph(p.getSex(),?tdfont));??

????????????????????table.addCell(new?Paragraph(String.valueOf(p.getAge()),??

????????????????????????????tdfont));??

????????????????}??

????????????????document.add(table);??

????????????????document.close();??

????????????//??baos.writeTo(response.getOutputStream());??

????????????????baos.close();??

????????????}?catch?(Exception?e)?{??

????????????????e.printStackTrace();??

????????????}??

????????}?else?if?("CSV".equals(downType))?{??

????????//??response.reset();??

????????????//?生成csv文件??

????????????//response.setHeader("Content-disposition",?"attachment;filename="??

????????????//??????+?fname?+?".csv");??

????????????//response.setContentType("text/csv");??

????????????//response.setCharacterEncoding("UTF-8");??

????????????FileOutputStream?out?;??

????????????String?sep?=?",";??

????????????try?{??

????????????????out?=?new?FileOutputStream(new?File("d://a.cvs"));??

????????????????//out?=?response.getOutputStream();??

????????????????out.write("id".getBytes());??

????????????????out.write(sep.getBytes());??

????????????????out.write("name".getBytes());??

????????????????out.write(sep.getBytes());??

????????????????out.write("sex".getBytes());??

????????????????out.write(sep.getBytes());??

????????????????out.write("age".getBytes());??

????????????????out.write(sep.getBytes());??

????????????????out.write(System.getProperty("line.separator").getBytes());??

????????????????for?(int?i?=?0;?i?<?list.size();?i++)?{??

????????????????????Person?p?=?(Person)?list.get(i);??

????????????????????out.write(p.getId().getBytes());??

????????????????????out.write((sep?+?"/t").getBytes());??

????????????????????out.write(p.getName().getBytes());??

????????????????????out.write((sep?+?"/t").getBytes());??

????????????????????out.write(p.getSex().getBytes());??

????????????????????out.write((sep?+?"/t").getBytes());??

????????????????????out.write(String.valueOf(p.getAge()).getBytes());??

????????????????????out.write((sep?+?"/t").getBytes());??

????????????????????out.write(sep.getBytes());??

????????????????????out.write(System.getProperty("line.separator").getBytes());??

????????????????}??

????????????????out.flush();??

????????????????//out.cloute();??

????????????}?catch?(Exception?e)?{??

????????????????e.printStackTrace();??

????????????}??

????????}?else?if?(downType.equals("Excel"))?{??

????????????//response.reset();??

????????????//?生成xls文件??

????????????//response.setContentType("application/vnd.ms-excel");??

????????????//response.setHeader("Content-disposition",?"attachment;filename="??

????????????//??????+?fname?+?".xls");??

????????????try?{??

????????????????//os?=?response.getOutputStream();??

????????????????Label?l?=?null;??

????????????????WritableWorkbook?wbook?=?Workbook.createWorkbook(new?File(??

????????????????????????"d://a.xls"));??

????????????????//?寫sheet名稱??

????????????????WritableSheet?sheet?=?wbook.createSheet("my?excel?file",?0);??

????????????????jxl.write.WritableFont?wfc4?=?new?jxl.write.WritableFont(??

????????????????????????WritableFont.ARIAL,?9,?WritableFont.NO_BOLD,?false,??

????????????????????????jxl.format.UnderlineStyle.NO_UNDERLINE,??

????????????????????????jxl.format.Colour.BLACK);??

????????????????jxl.write.WritableCellFormat?wcfFC4?=?new?jxl.write.WritableCellFormat(??

????????????????????????wfc4);??

????????????????wcfFC4.setBackground(jxl.format.Colour.LIGHT_GREEN);??

????????????????int?col?=?0;??

????????????????sheet.setColumnView(col,?12);??

????????????????l?=?new?Label(col,?0,?"id",?wcfFC4);??

????????????????sheet.addCell(l);??

????????????????col++;??

????????????????sheet.setColumnView(col,?12);??

????????????????l?=?new?Label(col,?0,?"name",?wcfFC4);??

????????????????sheet.addCell(l);??

????????????????col++;??

????????????????sheet.setColumnView(col,?12);??

????????????????l?=?new?Label(col,?0,?"sex",?wcfFC4);??

????????????????sheet.addCell(l);??

????????????????col++;??

????????????????sheet.setColumnView(col,?12);??

????????????????l?=?new?Label(col,?0,?"age",?wcfFC4);??

????????????????sheet.addCell(l);??

??

????????????????//?設置字體樣式??

????????????????jxl.write.WritableFont?wfc5?=?new?jxl.write.WritableFont(??

????????????????????????WritableFont.ARIAL,?9,?WritableFont.NO_BOLD,?false,??

????????????????????????jxl.format.UnderlineStyle.NO_UNDERLINE,??

????????????????????????jxl.format.Colour.BLACK);??

????????????????jxl.write.WritableCellFormat?wcfFC5?=?new?jxl.write.WritableCellFormat(??

????????????????????????wfc5);??

????????????????for?(int?i?=?0;?i?<?list.size();?i++)?{??

????????????????????Person?p?=?(Person)?list.get(i);??

????????????????????int?j?=?0;??

????????????????????l?=?new?Label(j,?i?+?1,?p.getId(),?wcfFC5);??

????????????????????sheet.addCell(l);??

????????????????????j++;??

????????????????????l?=?new?Label(j,?i?+?1,?p.getName(),?wcfFC5);??

????????????????????sheet.addCell(l);??

????????????????????j++;??

????????????????????l?=?new?Label(j,?i?+?1,?p.getSex(),?wcfFC5);??

????????????????????sheet.addCell(l);??

????????????????????j++;??

????????????????????l?=?new?Label(j,?i?+?1,?String.valueOf(p.getAge()),?wcfFC5);??

????????????????????sheet.addCell(l);??

????????????????????j++;??

????????????????}??

????????????????//?寫入流中??

????????????????wbook.write();??

????????????????wbook.close();??

??

????????????}?catch?(Exception?e)?{??

????????????????e.printStackTrace();??

????????????}??

????????}??

????????return?SUCCESS;??

????}??

????}??

????</pre><br><br>??

操作很簡單。選擇好要導出的報表格式。點擊導出按鈕。我們在d盤相應的位置就會生成相應的報表。

OK，介紹完畢。希望可以幫助有這個需求的朋友。

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