Struts2文件下载

编写Action类 提供输入流

import com.opensymphony.xwork2.ActionSupport;
import java.io.*;
import java.net.URLEncoder;

/**
 * @program: struts2_06
 * @description
 * @author: LIANG
 * @create: 2021-02-01 11:16
 **/
public class DownloadAction extends ActionSupport {
    private InputStream inputStream;
    String fileName;

    public String getFileName() {
        return fileName;
    }

    public InputStream getInputStream() {
        return inputStream;
    }

    public String dowmloadpic() throws FileNotFoundException, UnsupportedEncodingException {
        fileName="BAGE.JPG";
        String path="C:\\Users\\LIANG\\Pictures\\20200325\\"+fileName;
        inputStream = new FileInputStream(path);
        //下载名更改中文名 使用url编码
        fileName="图片.JPG";
        fileName = URLEncoder.encode(fileName, "UTF-8");
        return SUCCESS;
    }

}

配置struts.xml文件

<action name="download" class="org.ccit.com.web.action.DownloadAction" method="dowmloadpic">
<!--            以流的形式返回给客户端-->
    <result name="success" type="stream">
<!--                通过get方法获取输入流-->
        <param name="inputName">inputStream</param>
<!--                设置文件下载的俩个响应头-->
        <param name="contentDisposition">attachement;filename=${fileName}</param>
        <param name="contentType">application/octet-stream</param>
    </result>
</action>