Struts2实现文件下载

实现文件下载：

1.导包：commons-fileload-xx.jar

             commons-io-xx.jar

2.jsp页面：

<s:iterator value="#session.fileList">
      <a href="download.action?fileName=<s:property />"><s:property /></a>
        <br>
</s:iterator>

3.创建Action：DownLoAction

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 DownloadAction extends ActionSupport {
	private String fileName;	//要下载的文件名
	private String path;	//文件目录
	
	private InputStream inputStream; //读取文件，输入流
	private String contentType; //文件类型
	
	
	public String getContentType() {
		return contentType;
	}
	public void setContentType(String contentType) {
		this.contentType = contentType;
	}
	public void setInputStream(InputStream inputStream) {
		this.inputStream = inputStream;
	}
	public String getFileName() {
		return fileName;
	}
	public void setFileName(String fileName) {
		this.fileName = fileName;
	}
	public String getPath() {
		path=ServletActionContext.getServletContext().getRealPath("/upload");
		return path;
	}
	public void setPath(String path) {
		this.path = path;
	}
	
	public InputStream getInputStream() throws FileNotFoundException {
		inputStream = new BufferedInputStream(
                    new FileInputStream(this.getPath()+"/"+this.getFileName()));
		return inputStream;
	}
	@Override
	public String execute() throws Exception {
		
		return super.execute();
	}
}

4.配置action

<action name="download" class="com.action.DownloadAction">
  <result type="stream">
    <param name="contentType">application/octet-stream</param>//文件类型
    <param name="inputName">inputStream</param>//路径+文件名
    <param name="contentDisposition">attachment;filename="${fileName}"</param>
    <param name="bufferSize">50000</param>//缓冲区大小
  </result>
</action>