struts2文件下载 注意中文问题

1.页面 

<ahref="downAction?filename=要下载的文件名">要下载的文件名</a>

2.DownAction

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class DownAction extends ActionSupport {

    private String filename;

    public String getFilename() {

        return filename;

    }

    public void setFilename(Stringfilename) {

        try {

            this.filename = newString(filename.getBytes("ISO-8859-1"),"UTF-8");                                                      

        }catch(UnsupportedEncodingException e) {

            e.printStackTrace();

        }

    }

    public InputStream  getInputStream(){

         HttpServletResponse response =ServletActionContext.getResponse();

            try {

                response.setHeader("Content-Disposition","attachment;fileName="+java.net.URLEncoder.encode(filename,"UTF-8"));          

            }catch(UnsupportedEncodingException e) {

                e.printStackTrace();

            }

        return ServletActionContext.getServletContext().

                getResourceAsStream("/up/"+filename);

    }

    @Override

    public String execute() throws Exception {

        System.err.println("InputStream:"+getInputStream());                                  此处最好打印以下测试看看是否获取到输出流

        System.err.println("下载:" + getFilename()+">>>>>>"+ServletActionContext.getServletContext().

                getRealPath(getFilename()));

        return SUCCESS;

    }

}

3.struts.xml

<package name="user" extends="struts-default"namespace="/">

        <!—-引用拦截器 -->

        <default-interceptor-ref name="defaultStack"></default-interceptor-ref>

        <action name="downAction" class="czb.hr.user.action.DownAction">

            <result name="success" type="stream">

                <!-- 调用getFile方法 -->

                <param name="inputName">InputStream</param>

                <!-- 以下会下载图片,注意第一个参数 -->

                <param name="contentDisposition">attachment;filename="${filename}"</param>

                <param name="bufferSize">4096</param>

            </result>

            <exception-mapping result="error" exception="java.lang.Exception"></exception-mapping>

        </action>

 

    </package>