struts2文件下载的实现

来源:转载

http://elf8848.iteye.com/blog/640964

http://elf8848.iteye.com/blog/275823

struts2.xml配置:

1 <action name="ExportDB" class="edu.xjtu.sei.xxxx.action.DBManager.ExportDBAction">2 <result name="success" type="stream">3 <param name="contentType">application/octet-stream</param>4 <param name="inputName">inputStream</param> 5 <param name="bufferSize">409600</param>6 <param name="contentDisposition">attachment;filename="${filename}"</param>7 <param name=""></param>8 </result> 9 </action > 

ExportDBAction.java

import java.io.BufferedReader;import java.io.ByteArrayInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.Date;import java.util.Iterator;import java.util.List;import org.apache.struts2.json.annotations.JSON;import com.opensymphony.xwork2.ActionSupport;import edu.xjtu.sei.xxx.business.dao.HostInfectDAO;import edu.xjtu.sei.xxx.util.DateUtils;public class ExportDBAction extends ActionSupport{ String filename; String flag; String errormessage; String properties; private HostInfectDAO hostinfectdao; public void setHostInfectDAO(HostInfectDAO hostinfectdao) { this.hostinfectdao = hostinfectdao; } public String getProperties() { return properties; } public void setProperties(String properties) { this.properties = properties; } boolean success; public String execute() {

success=true; return SUCCESS;

} public String getFilename() { return filename; } public void setFilename(String filename) { this.filename = filename; } public String getFlag(){ return flag; } public void setFlag(String flag){ this.flag=flag; } public String getErrormessage() { return errormessage; } public void setErrormessage(String errormessage) { this.errormessage = errormessage; } public boolean isSuccess() { return success; } public void setSuccess(boolean success) { this.success = success; } public InputStream getInputStream() throws IOException { List results=null; StringBuilder export=new StringBuilder(); results=hostinfectdao.getExportDB(flag); export.append("IP,域名,时间"+"/n"); for (Iterator iter = results.iterator(); iter.hasNext();) { Object[] row=(Object[]) iter.next(); String ip=row[0].toString(); String dns=row[1].toString(); String time=DateUtils.formatDateEx((Date)row[3]).toString(); export.append(ip+","+dns+","+time+"/n"); } ByteArrayInputStream stream = new ByteArrayInputStream(export.toString().getBytes("gbk")); return stream; } public static void main(String args[]) throws IOException{ ExportDBAction a=new ExportDBAction(); a.setProperties("1"); a.getInputStream(); }}

请求action的js函数:

function exportTable(filename,flag){ //window.location.href = "ExportDB.action?filename="+filename+".csv&flag="+flag+"&contentType=application/octet-stream"; window.location.href = "ExportDB.action?filename="+filename+".csv&flag="+flag;

}

之前IE浏览器下载的时候一直自动打开文件。

那时struts.xml里的<param name="contentDisposition">attachment;filename="${filename}"</param>

是这样写的:<param name="contentDisposition">filename="${filename}"</param>

后来把attachment加上就好了。

参考文章说的很清楚:

要直接下载一个文件,我们需要做两件事,

第一件事是:设定响应的内容类为“application/octet-stream”,大小写无关。

第二件事是:设置HTTP的响应头名字为:Content-Disposition,设定值为:attachment;   filename   =   theFileName。这里的theFileName就是出现在文件下载对话框里的默认文件名,通常和所下载的文件名字相同,但也可以不同。

jsp页面的实现代码:

html代码:

 <% // 得到文件名字和路径 String filename = "MengxianhuiDocTest.doc"; String filepath = "D://"; // 设置响应头和下载保存的文件名 response.setContentType("APPLICATION/OCTET-STREAM"); response.setHeader("Content-Disposition", "attachment; filename=/"" + filename + "/""); // 打开指定文件的流信息 java.io.FileInputStream fileInputStream = new java.io.FileInputStream(filepath + filename); // 写出流信息 int i; while ((i=fileInputStream.read()) != -1) { out.write(i); } fileInputStream.close(); out.close(); %> 

 

 

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