用struts2输出文件流

有的时候超链接下载文件的方式并不能满足我们的需求，我们希望能够自己写回文件流，那么在struts2中如何做呢？

第一步，配置struts2.xml，示例如下：

<action name="ExcelAction" class="com.yingxia.trms.excel.ExcelAction">
    <result name="success" [color=red]type="stream"[/color]>
        <param name="contentType">application/vnd.ms-excel</param>
        <param name="contentDisposition">attachment; filename="${downloadChineseFileName}.xls"</param>
        <param name="inputName">outputStream</param>
    </result>
</action>

 

第二步，写action，这是一个示例的action（请忽略area和excelBiz）

package com.yingxia.trms.excel;

import java.io.InputStream;
import java.io.UnsupportedEncodingException;

import org.apache.struts2.ServletActionContext;

import com.google.inject.Inject;
import com.opensymphony.xwork2.Action;

public class ExcelAction {

    private String fileName;
    private String area;
    private InputStream outputStream;
   
    private ExcelBiz excelBiz;
   
    public String execute() throws Exception {
        excelBiz.generateExcel(area, fileName);
        outputStream = ServletActionContext.getServletContext().getResourceAsStream("excel/" + fileName + ".xls");
        return Action.SUCCESS;
    }
   
        // 解决下载中文文件名的问题
    public String getDownloadChineseFileName() throws UnsupportedEncodingException {
        return new String(fileName.getBytes(), "ISO8859-1");
    }

    public String getFileName() {
        return fileName;
    }

    public void setFileName(String fileName) {
        this.fileName = fileName;
    }

    public InputStream getOutputStream() {
        return outputStream;
    }

    public void setOutputStream(InputStream outputStream) {
        this.outputStream = outputStream;
    }

    public String getArea() {
        return area;
    }

    public void setArea(String area) {
        this.area = area;
    }

    public ExcelBiz getExcelBiz() {
        return excelBiz;
    }

    @Inject
    public void setExcelBiz(ExcelBiz excelBiz) {
        this.excelBiz = excelBiz;
    }
   
}