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>