HTML页面并不总是向用户显示数据输出的最好方式，有时候需要生成不可改变的文件打印，PDF可能是种不错的选择。
Spring支持从数据动态生成PDF或Excel文件
下面这个简单实现的例子实现了spring输出PDF和Excel文件，为了使用Excel电子表格，你需要在你的classpath中加入poi-2.5.1.jar库文件，而对PDF文件，则需要iText.jar文件。它们都包含在Spring的主发布包中。
下面是测试项目代码：
1、控制器配置代码
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="beanNameViewResolver"
class="org.springframework.web.servlet.view.BeanNameViewResolver" />
<bean id="viewController" class="com.zhupan.spring.ViewController" />
<bean id="urlMapping"
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/view*.shtml">viewController</prop>
</props>
</property>
</bean>
</beans>
3、用于Excel视图的视图子类化
为了在生成输出文档的过程中实现定制的行为，我们将继承合适的抽象类。对于Excel，这包括提供一个 org.springframework.web.servlet.view.document.AbstractExcelView的子类，并实现 buildExcelDocument方法。
package com.zhupan.view;
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;
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("m/d/yy"));
cell = getCell(sheet, 1, 0);
cell.setCellValue(new Date());
cell.setCellStyle(dateStyle);
getCell(sheet, 2, 0).setCellValue(458);
HSSFRow sheetRow = sheet.createRow(3);
for (short i = 0; i < 10; i++) {
sheetRow.createCell(i).setCellValue(i * 10);
}
}
}
4、用于PDF视图的视图子类化
需要象下面一样继承org.springframework.web.servlet.view.document.AbstractPdfView，并实现buildPdfDocument()方法。
package com.zhupan.view;
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;
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)));
}
}
5、其他文件
1）控制器ViewController
package com.zhupan.spring;
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.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;
import com.zhupan.view.ViewExcel;
import com.zhupan.view.ViewPDF;
public class ViewController extends MultiActionController{
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);
}
public ModelAndView viewExcel(HttpServletRequest request, HttpServletResponse response) throws Exception {
List list = new ArrayList();
Map model=new HashMap();
list.add("test1");
list.add("test2");
model.put("list",list);
ViewExcel viewExcel=new ViewExcel();
return new ModelAndView(viewExcel,model);
}
} 2）web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>springPDFTest</display-name>
<servlet>
<servlet-name>springPDFTest</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springPDFTest</servlet-name>
<url-pattern>*.shtml</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
3)index.jsp
<%@ page contentType="text/html; charset=gb2312"%>
<a href="viewPDF.shtml">PDF视图打开 </a>
<br>
<a href="viewExcel.shtml">Excel视图打开</a>
posted on 2006-10-06 15:07
xzc 阅读(803)
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