struts-Basic content -8-File download

Struts2 file download requires action to provide a way to return the InputStream stream, which represents the entry for the downloaded file.

One: Write Action class

Downloadaction.java

 PackageAction;ImportCom.opensymphony.xwork2.ActionSupport;ImportJava.io.FileInputStream;ImportJava.io.InputStream;/*** Created by Cxspace on 16-7-12.*/ Public classDownloadactionextendsactionsupport{//This property value can be specified dynamically in the configuration file, and the path to the file to be downloaded    PrivateString InputPath;
             PublicString Getinputpath () {returnInputPath; }    //method of Dependency Injection changing attribute value     Public voidSetinputpath (String inputpath) { This. InputPath =InputPath; }
     
/x
Define a method to return InputStream, which will act as the entry for the downloaded file, and need to configure the InputName parameter specified by the stream type result
InputName parameter value is the method to remove the get prefix, the first letter lowercase string
x/ PublicInputStream Gettargetfile ()throwsException {return NewFileInputStream (InputPath); }}

Two: Configure action

Configuring the desired key download, the key is to configure a result of type stream

Four key attributes to be specified in the result

ContentType: Specifies the file type of the downloaded file

InputName: Specifies the ingress input stream for the downloaded file

Contentdispostion: Specifies the file name of the download

BufferSize: Specifies the buffer size when downloading a file

 PackageAction;

ImportCom.opensymphony.xwork2.ActionSupport;
ImportJava.io.FileInputStream;
ImportJava.io.InputStream;

/**
* Created by Cxspace on 16-7-12.
 */
Public classDownloadactionextendsactionsupport{

    //This property value can be specified dynamically in the configuration file
PrivateStringInputPath;

 PublicStringGetinputpath() {
        returnInputPath;
}

    //method of Dependency Injection changing attribute value
Public voidSetinputpath(String InputPath) {
         This.InputPath= InputPath;
}

     PublicInputStreamGettargetfile()throwsException {

        return newFileInputStream (InputPath);
}
}

struts-Basic content -8-File download