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>