文件下载

//文件下载
在标签里制定文件的路径：
<a href="download.action?fileName=16.1.txt">点击此处下载文档</a>  
制定的文件是web工程中的

<action name="download" class="action.FileDownAction">
    <param name="inputPath">/image</param>
    <result name="success" type="stream">
     <param name="contentType">application/octet-stream</param>
     <param name="inputName">inputStream</param>
     <param name="contentDisposition">
      arrachment;filename="${fileName}"
     </param>
     <param name="bufferSize">4096</param>
    </result>
    </action>

创建真正文件下载类FileDownAction

package action;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class FileDownAction extends ActionSupport {

 private String inputPath;
 private String fileName;
 private InputStream inputStream;
 private String contentType;
 public String getInputPath() {
  return inputPath;
 }
 public void setInputPath(String inputPath) {
  this.inputPath = inputPath;
 }
 public String getFileName() {
  return fileName;
 }
 public void setFileName(String fileName) {
  this.fileName = fileName;
 }
 public InputStream getInputStream() throws Exception {
  String path =ServletActionContext.getServletContext().getRealPath(inputPath);
  return new BufferedInputStream(new FileInputStream(path+"\"+fileName));
 }
 public void setInputStream(InputStream inputStream) {
  this.inputStream = inputStream;
 }
 public String getContentType() {
  return contentType;
 }
 public void setContentType(String contentType) {
  this.contentType = contentType;
 }
 @Override
 public String execute() throws Exception {
  return SUCCESS;
 }
  
}