Struts2利用stream直接输出Excel
用网页展示查询结果，经常会遇到要求导出成Excel的需求。采用这种方法可以定制输出的格式和内容（还不支持合并单元格和公式），生成真正的Excel格式（不是csv）的Excel。一、struts.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts>
<constant name="struts.i18n.encoding" value="UTF-8"/>
<package name="demo" extends="struts-default"> <action name="excel" method="execute" class="demo.ExcelAction"> <result name="excel" type="stream"> <param name="contentType">application/vnd.ms-excel</param> <!-- 注意这里的ContentType --> <param name="inputName">excelStream</param> <!-- 这里需要和Action里的变量名一致 --> <param name="contentDisposition">filename="standard.xls"</param> <param name="bufferSize">1024</param> </result> </action> </package> </struts>
二、Struts2的 Action
package demo; public class ExcelAction { private InputStream excelStream; // 需要生成getter和setter
public String execute() throws Exception { StringBuffer excelBuf = new StringBuffer(); excelBuf.append("BookName").append("\t").append("Year").append("\t").append("author").append("\n"); excelBuf.append("Thinking in Java").append("\t").append("2001").append("\t").append("Eckel").append("\n"); excelBuf.append("Spring in action").append("\t").append("2005").append("\t").append("Rod").append("\n"); String excelString = excelBuf.toString(); logger.debug("result excel String: " + excelString); excelStream = new ByteArrayInputStream(excelString.getBytes(), 0, excelString.length()); return "excel"; }
// getter and setter ... }
三、Jsp页面
<%@ taglib prefix="s" uri="/struts-tags"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <s:head /> </head>
<body>
<s:form action="" method="post"> <s:submit key="button.submit"/> </s:form> </body> </html>
<constant name="struts.i18n.encoding" value="UTF-8"/>
<package name="demo" extends="struts-default"> <action name="excel" method="execute" class="demo.ExcelAction"> <result name="excel" type="stream"> <param name="contentType">application/vnd.ms-excel</param> <!-- 注意这里的ContentType --> <param name="inputName">excelStream</param> <!-- 这里需要和Action里的变量名一致 --> <param name="contentDisposition">filename="standard.xls"</param> <param name="bufferSize">1024</param> </result> </action> </package> </struts>
二、Struts2的 Action
package demo; public class ExcelAction { private InputStream excelStream; // 需要生成getter和setter
public String execute() throws Exception { StringBuffer excelBuf = new StringBuffer(); excelBuf.append("BookName").append("\t").append("Year").append("\t").append("author").append("\n"); excelBuf.append("Thinking in Java").append("\t").append("2001").append("\t").append("Eckel").append("\n"); excelBuf.append("Spring in action").append("\t").append("2005").append("\t").append("Rod").append("\n"); String excelString = excelBuf.toString(); logger.debug("result excel String: " + excelString); excelStream = new ByteArrayInputStream(excelString.getBytes(), 0, excelString.length()); return "excel"; }
// getter and setter ... }
三、Jsp页面
<%@ taglib prefix="s" uri="/struts-tags"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <s:head /> </head>
<body>
<s:form action="" method="post"> <s:submit key="button.submit"/> </s:form> </body> </html>