Struts2文件下载

package cn.temp;

import java.io.FileInputStream;
import java.io.InputStream;
import java.net.URLEncoder;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class ThreeAction extends ActionSupport {
    // 1: 开发execute方法，如果execute方法正常执行成功，则返回successs/down
    // 只有返回string以后才会去下载
    @Override
    public String execute() throws Exception {
        System.err.println("判断用户的积分...");
        //对名称进行编码
        String str = "倒霉.mp4";
        str = URLEncoder.encode(str, "UTF-8");
        ActionContext.getContext().put("name", str);
        return "down";
    }

    // 2:如果返回到了<result name="down" type="stream"/>
    // 此时就会开始调用getInputSteam方法获取文件的二进制数据
    public InputStream getFile() throws Exception {
        String path = ServletActionContext.getServletContext().getRealPath("/files/dmx1.mp4");
        InputStream in = new FileInputStream(path);
        return in;
    }
}

struts  xml文件配置

<!-- 配置下载 -->
		<action name="three" class="cn.temp.ThreeAction">
			<result name="down" type="stream">
				<param name="contentType">application/force-download</param>
				<param name="contentDisposition">attachment;filename=${name}</param>
				<!-- 指定哪一个方法可以获取二进制数据,则在类中，必须要有一个应运getFile():InputStream -->
				<param name="inputName">file</param>
			</result>
		</action>

　　inputname  默认是InputStream