用spring MVC 生成Excel和PDF

HTML頁面並不總是向用戶顯示數據輸出的最好方式，Spring支持從數據動態生成PDF或Excel文件，並使這一過程變得簡單。文檔本身就是視圖，從服務器以流的方式加上內容類型返回文檔，客戶端PC只要運行電子表格軟件或PDF瀏覽軟件就可以瀏覽。下面是一個簡單實現的例子：界面兩個button，一個實現excel ,一個pdf.爲了使用Excel電子表格，你需要在你的classpath中加入‘poi’庫文件，而對PDF文件，則需要iText.jar文件。它們都包含在Spring的主發佈包中。另外經過測試還需要加入包spring-beans.jar，spring-context.jar，spring-web.jar，spring-webmvc.jar。

1、web.xml配置文件，主要配置相應的servlet即可
<!-- Spring MVC 的Servlet，它將加載WEB-INF/spring-servlet.xml 以啓動Spring MVC模塊-->
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>*.form</url-pattern>
  </servlet-mapping>

2、控制文件及spring-servlet.xml配置,增加ViewController的配置
  <!-- 生成excel或pdf視圖 -->
  <bean class="com.lzk.controller.ViewController">
  </bean>

3、ViewController的代碼
package com.lzk.controller;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import com.supcon.electronic.its.common.ViewExcel;
import com.supcon.electronic.its.common.ViewPDF;
/**
* 生成excel或PDF類型試圖
* 根據參數進行數據組裝，並跳轉到相應的視圖頁面
* View Controller Bean<br>
*
* @author Tony Lin Created on 2008-10-22
* @version Version 1.0
*/

@Controller
@RequestMapping("/view.form")
public class ViewController extends BaseController {

@RequestMapping(params="method=exceltest",method=RequestMethod.GET)
public ModelAndView viewExcel(HttpServletRequest request, HttpServletResponse response){
  log.debug("ViewController.viewExcel is started......");
  List list = new ArrayList();   
        Map model = new HashMap();   
        list.add("test1");   
        list.add("test2");   
        model.put("list", list);   
        ViewExcel viewExcel = new ViewExcel();   
        log.debug("ViewController.viewExcel is ended......");
        return new ModelAndView(viewExcel, model); 
}

@RequestMapping(params="method=pdftest",method=RequestMethod.GET)
public ModelAndView viewPDF(HttpServletRequest request,   
            HttpServletResponse response) throws Exception {   
        List list = new ArrayList();   
        Map model = new HashMap();   
        list.add("test1");   
        list.add("test2");   
        model.put("list", list);   
        ViewPDF viewPDF = new ViewPDF();   
        return new ModelAndView(viewPDF, model);   
    }   
}

4、用於Excel視圖的視圖子類
package com.lzk.common;
import java.util.Date;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.web.servlet.view.document.AbstractExcelView;
/**
* 生成excel視圖，可用excel工具打開或者保存
* 由ViewController的return new ModelAndView(viewExcel, model)生成
* @author Tony Lin Created on 2008-10-22
* @version Version 1.0
*/
public class ViewExcel extends AbstractExcelView {   
   
    public void buildExcelDocument(Map model, HSSFWorkbook workbook,   
            HttpServletRequest request, HttpServletResponse response)   
            throws Exception {   
  
        HSSFSheet sheet = workbook.createSheet("list");   
        sheet.setDefaultColumnWidth((short) 12);   
  
        HSSFCell cell = getCell(sheet, 0, 0);   
        setText(cell, "Spring Excel test");   
  
        HSSFCellStyle dateStyle = workbook.createCellStyle();   
        //dateStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("mm/dd/yyyy"));   
        cell = getCell(sheet, 1, 0);   
        cell.setCellValue("日期：2008-10-23");   
        //cell.setCellStyle(dateStyle);   
        getCell(sheet, 2, 0).setCellValue("測試1");  
        getCell(sheet, 2, 1).setCellValue("測試2"); 
  
        HSSFRow sheetRow = sheet.createRow(3);   
        for (short i = 0; i < 10; i++) {   
            sheetRow.createCell(i).setCellValue(i * 10);   
        }   
  
    }   
}

5、用於PDF視圖的視圖子類
package lzk.common;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.view.document.AbstractPdfView;
import com.lowagie.text.Document;
import com.lowagie.text.Paragraph;
import com.lowagie.text.pdf.PdfWriter;
/**
* 生成PDF視圖，可用PDF瀏覽器打開或者保存
* 由ViewController的return new ModelAndView(viewPDF, model)生成
* @author Tony Lin Created on 2008-10-22
* @version Version 1.0
*/
public class ViewPDF extends AbstractPdfView {   
    public void buildPdfDocument(Map model, Document document,   
            PdfWriter writer, HttpServletRequest request,   
            HttpServletResponse response) throws Exception {   
  
        List list = (List) model.get("list");   
  
        for (int i = 0; i < list.size(); i++)   
            document.add(new Paragraph((String) list.get(i)));   
    }   
} 

6、JSP頁面調用
<a href="<%=path %>/view.form?method=pdftest" target="blank">保存pdf</a>
<input name="button" type="button" id="button" value="保存excel" 
οnclick="javascript:window.open('<%=path %>/view.form?method=exceltest');"/>