struts2 下的文件下载

推荐：Struts 2中实现文件下载（修正中文问题）http://lichen.blog.51cto.com/697816/153753

本网址中解释了配置文件的各个参数的含义

 

 

package utils;

import java.io.File;
import java.io.InputStream;
import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class DownLoadAction extends ActionSupport {

 
 private String fileName; // 文件名参数变量
 
 private String filePath; // 文件路径
 
 private String parameter; // 其他参数

 // 从下载文件原始存放路径读取得到文件输出流
 public InputStream getDownloadFile() {
  
  return ServletActionContext.getServletContext().getResourceAsStream(filePath);
 }
 
 // 如果下载文件名为中文，进行字符编码转换
 public String getDownloadChineseFileName(){
  
  String downloadChineseFileName = fileName;

   try {
     downloadChineseFileName = new String(downloadChineseFileName.getBytes(), "ISO-8859-1");
   } catch (Exception e) {
    return ERROR;
   }

   return downloadChineseFileName;  
   
 }

 public String execute() {
  
  String basePath = ServletActionContext.getServletContext().getRealPath("");
  
  String newFilePath = basePath + filePath;
  
  File file = new File(newFilePath);
  
  if (!file.isFile()||!file.exists()) {
  
   HttpServletRequest request = ServletActionContext.getRequest();
   request.getSession().setAttribute("message", "文件已经不存在，请联系管理员！");
   
   return "downloaderror";
  
  } else {
   return SUCCESS;
  }
  
 }
 
 public String getFileName() {
  return fileName;
 }

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

 public String getFilePath() {
  return filePath;
 }

 public void setFilePath(String filePath) {
  this.filePath = filePath;
 } 
 public String getParameter() {
  return parameter;
 }

 public void setParameter(String parameter) {
  this.parameter = parameter;
 }

}
/**
     <!-- 下载文件配置 如下 -->
          <action name="downLoadFile" class="utils.DownLoadAction">
          <result name="success" type="stream">
     <param name="contentType">application/vnd.ms-word</param>    
     <param name="contentDisposition">filename="${downloadChineseFileName}"</param>
     <param name="inputName">downloadFile</param>
    </result>
    <result name="downloaderror" type="redirectAction" >
       showViewGrowupInfo.action?growupInfoId=${parameter}
    </result>
          </action>

   调用下载链接 如下：
    <a href="${pageContext.request.contextPath }/personcenter/growinfo/downLoadFile.action?filePath=${growUpFile.fileAddress}&fileName=${growUpFile.fileName}&parameter=${growUpinfo.growupInfoId}" >下载</a>
*/