Struts2文件下载

时间：2022-05-09 06:14:18

1). Struts2 中使用 type="stream" 的 result 进行下载

2). 可以为 stream 的 result 设定如下参数

contentType: 结果类型
contentLength: 下载的文件的长度
contentDisposition: 设定 Content-Dispositoin 响应头. 该响应头指定接应是一个文件下载类型, 一般取值为  attachment;filename=document.pdf.

inputName: 指定文件输入流的 getter 定义的那个属性的名字. 默认为 inputStream

bufferSize: 缓存的大小. 默认为 1024
allowCaching: 是否允许使用缓存
contentCharSet: 指定下载的字符集

3). 以上参数可以在 Action 中以 getter 方法的方式提供!

4). 示例：

jsp页面：

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

 <a href="downLoad">点击下载success.jsp文件</a>

</body>

</html>

Action：

package com.elgin.action;

import java.io.File;

import java.io.FileInputStream;

import java.io.InputStream;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class DownloadAction extends ActionSupport {

	/**

	 *

	 */

	private static final long serialVersionUID = 1L;

	private String contentType;

	private long contentLength;

	private String contentDisposition;

	private InputStream inputStream;

	public String getContentType() {

		return contentType;

	}

	public void setContentType(String contentType) {

		this.contentType = contentType;

	}

	public long getContentLength() {

		return contentLength;

	}

	public void setContentLength(long contentLength) {

		this.contentLength = contentLength;

	}

	public String getContentDisposition() {

		return contentDisposition;

	}

	public void setContentDisposition(String contentDisposition) {

		this.contentDisposition = contentDisposition;

	}

	public InputStream getInputStream() {

		return inputStream;

	}

	public void setInputStream(InputStream inputStream) {

		this.inputStream = inputStream;

	}

	@Override

	public String execute() throws Exception {

		//确定各个成员属性的值：

		this.contentType="text/html";

		this.contentDisposition="attachment;filename=success.jsp";

		String path=ServletActionContext.getServletContext().getRealPath("/files/success.jsp");

		File file=new File(path);

		this.inputStream=new FileInputStream(file);

		this.contentLength=inputStream.available();

		return SUCCESS;

	}

}

struts2配置文件配置：

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

          "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

          "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <package name="com" extends="struts-default">

        <action name="downLoad" class="com.elgin.action.DownloadAction">

           <result type="stream">

              <param name="bufferSize">2048</param>

           </result>

        </action>

    </package>

</struts>

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