参数说明:
type = "stream",这里的type一定要等于stream;
对params的几个参数的解释:
"contentType", "application/octet-stream" : 文件格式;
"inputName", "attachstream" :获取文件的方法名;这里的attachstream需要和action里的attachstream对应,类型就是InputStream;
"contentDisposition", "attachment;filename="${attachname}"":文件内容(显示的)属性,
这里的filename="${attachname}" :下载之后的文件名;这里需要在action里定义一个变量,去获取下载文件的文件名,包括后缀,例如:下载的文件为**/**/upload/test.jpg,那么需要定义一个变量attachname,变量名一定要对应,然后,attachname = test.jsp;
"bufferSize", "4096" :限定下载文件 缓冲区的值;
通过上述属性的解释,我们可以知道,在action里需要定义的变量有以下几个:
private InputStream attachstream;//文件读取流对象
private String attachname;//下载文件的名字
然后需要对应的getter/setter方法,
action实现代码如下:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 @Action(value = "/admin/toDownload", 2 results = {@Result(name = "download", type = "stream", 3 params = { 4 "contentType", "application/octet-stream", 5 "inputName", "attachstream", 6 "contentDisposition", "attachment;filename="${attachname}"", 7 "bufferSize", "4096" 8 })}) 9 public String toDownload(){ 10 String path = ServletActionContext.getServletContext().getRealPath("/" + fileName);//fileName是页面传过来的参数 11 try { 12 attachstream = new FileInputStream(path); 13 String []attachnames = fileName.split("/"); 14 attachname = attachnames[attachnames.length - 1]; 15 } catch (FileNotFoundException e) { 16 e.printStackTrace(); 17 } 18 return "download"; 19 }
我自己写的:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 @ParentPackage("managerPackage") 2 @Namespace("/districtTest") 3 @Action("districtTest") 4 @Results({ 5 @Result(name="districtTest_list",location="/manage/districtTest/districtTest_list.jsp"), 6 @Result(name="districtTest_add",location="/manage/districtTest/districtTest_add.jsp"), 7 @Result(name="districtTest_edit",location="/manage/districtTest/districtTest_edit.jsp"), 8 @Result(name="districtTest_show",location="/manage/districtTest/districtTest_show.jsp"), 9 @Result(name="districtTest_show0",location="/manage/districtTest/districtTest_show0.jsp"), 10 @Result(name = "download", type = "stream", 11 params = { 12 "contentType", "application/octet-stream", 13 "inputName", "inputStream", 14 "contentDisposition", "attachment;filename="${attachname}"", 15 "bufferSize", "4096" 16 }) 17 18 }) 19 20 21 22 //下载 23 public String download(){ 24 try { 25 26 if(upload!=null&&!"".equals(upload)){ 27 String path = ServletActionContext.getServletContext().getRealPath("/" + upload); 28 inputStream = new FileInputStream(path); 29 String []attachnames = upload.split("/"); 30 attachname = attachnames[attachnames.length - 1]; 31 } 32 return "download"; 33 } catch (Exception e) { 34 // TODO: handle exception 35 Loggers.error("----DistrictTestAction的download方法错误"+e.getMessage()); 36 e.printStackTrace(); 37 } 38 return ERROR; 39 }