Struts2做下载

1、编写anction,如下：

package cn.com.css.misps.onlinegraph.web.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import javax.annotation.Resource;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;

import cn.com.css.common.action.BaseAction;
import cn.com.css.misps.domain.ServiceCode;
import cn.com.css.misps.domain.ServiceProductCode;
import cn.com.css.misps.domain.TPrCategory;
import cn.com.css.misps.onlinegraph.service.IServiceCodeService;
import cn.com.css.misps.onlinegraph.service.IServiceProductCodeService;
import cn.com.css.misps.onlinegraph.service.ITPrCategoryService;
import cn.com.css.misps.onlinegraph.service.ITProductInfoService;
import cn.com.css.misps.onlinegraph.util.AnalysisMicaps2BytesUtils;
import cn.com.css.misps.onlinegraph.util.DateUtil;
import cn.com.css.misps.onlinegraph.util.FNameUtils;
import cn.com.css.misps.onlinegraph.util.ImageBytesAnalysisUtils;
import cn.com.css.misps.onlinegraph.util.ProductsStorageUtils;
import cn.com.css.misps.onlinegraph.webservice.impl.GraphWebServiceImpl;
import cn.com.system.domain.Account;
import com.opensymphony.xwork2.ActionContext;

/**
 * @brief OnlineGraphAction.java 这里是在线出图部分的代码
 * @attention 要注意的是页面中的表单填写的是服务方法中要求填写的参数
 * @author 涂作权
 * @date 2013-9-4
 * @note begin modify by null
 */
@SuppressWarnings("serial")
@Scope("prototype")
@Controller
public class OnlineGraphAction extends BaseAction {

 // 相对门户项目的相对路径
 private String relativeStorageFilePath;

 // 图形文件的文件名称
 private String imgPath;

 // 下载文件用户的
 private InputStream inputStream;

 /**
  * \brief 下载产生的图片
  *
  * @return
  * @attention
  * @author 涂作权
  * @date 2014-3-26
  * @note begin modify by null
  */
 public String download() throws Exception {
  inputStream = new FileInputStream(
    ProductsStorageUtils.graphAbsolutePath
      + relativeStorageFilePath + "/" + imgPath);
  //这里的imgPath表示的是的是文件的名称，即：fName
  String name = URLEncoder.encode(imgPath,"utf-8");
  ActionContext.getContext().put("name", name);
  return "download";
 }

 /**
  * @return the imgPath
  */
 public String getImgPath() {
  return imgPath;
 }

 /**
  * @param imgPath
  *            the imgPath to set
  */
 public void setImgPath(String imgPath) {
  this.imgPath = imgPath;
 }

 /**
  * @return the inputStream
  */
 public InputStream getInputStream() {
  return inputStream;
 }

 /**
  * @param inputStream
  *            the inputStream to set
  */

 public void setInputStream(InputStream inputStream) {
  this.inputStream = inputStream;
 }
}

在struts配置文件中进行如下配置：

 <action name="onlinegraph_*" class="cn.com.css.misps.onlinegraph.web.action.OnlineGraphAction" method="{1}">
   <result name="download" type="stream">
    <param name="inputName">inputStream</param>
    <param name="contentDisposition">attachment;filename="${#name}"</param>
    <param name="bufferSize">4096</param>
   </result>
  </action>