struts2文件下载

struts2文件下载

以下是注解方式的struts2文件下载

@ResultPath("/")
@Results(value={@Result(name="success", type="stream",params={"contentType","image/jpg","inputName","targetFile","contentDisposition","attachment;filename=123.jpg","bufferSize","4096"})})
public  class DownloadAction  extends ActionSupport {

     private InputStream targetFile;
    
     public InputStream getTargetFile() {
         // 123.jpg文件必须存在,特别注意
         // 否则会抛异常 Can not find a java.io.InputStream with the name [targetFile]  
         // 上边异常的解决参见   http://blog.youkuaiyun.com/wolma/article/details/5351638
         return ServletActionContext.getServletContext().getResourceAsStream("/upload/123.jpg");
    }

     public  void setTargetFile(InputStream targetFile) {
         this.targetFile = targetFile;
    }
}

index.jsp

<% @ page language = " java "  import = " java.util.* "  pageEncoding = " UTF-8 " %>
<%
String  path  =  request.getContextPath();
String  basePath  =  request.getScheme() + " :// " + request.getServerName() + " : " + request.getServerPort() + path + " / " ;
%>

<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" >
< html >
   < head >
     < base  href ="<%=basePath%>" >
    
     < title >My JSP 'index.jsp' starting page </ title >
     < meta  http-equiv ="pragma"  content ="no-cache" >
     < meta  http-equiv ="cache-control"  content ="no-cache" >
     < meta  http-equiv ="expires"  content ="0" >    
     < meta  http-equiv ="keywords"  content ="keyword1,keyword2,keyword3" >
     < meta  http-equiv ="description"  content ="This is my page" >
     <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
     -->
   </ head >
  
   < body >
    < a  href ="download.action" >123.jpg </ a >
   </ body >
</ html >