javaweb文件下载
2024-08-29 11:19:47
最近搞了一下struts文件上传下载了，一个是通过struts自带的类实现的下载方法，一个是通用的下载方法：
struts实现：
FileDownloadAction.java
package com.fro.action; import java.io.FileInputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder; import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware; import com.opensymphony.xwork2.ActionSupport; public class FileDownloadAction extends ActionSupport implements ServletRequestAware, ServletResponseAware { /**
*
*/
private static final long serialVersionUID = 1L; private HttpServletRequest request;
private HttpServletResponse response;
private int number;
private String fileName;
private String contentType; public int getNumber() {
return number;
} public void setNumber(int number) {
this.number = number;
} public String getFileName() {
return fileName;
} public void setFileName(String fileName) throws UnsupportedEncodingException {
this.fileName = fileName;
} public HttpServletResponse getResponse() {
return response;
} public void setResponse(HttpServletResponse response) {
this.response = response;
} public String getContentType() {
return contentType;
} public void setContentType(String contentType) {
this.contentType = contentType;
} // 返回一个输入流，作为一个客户端来说是一个输入流，但对于服务器端是一个 输出流
public InputStream getDownloadFile() {
try {
if (1 == number) {
this.fileName = "使用说明书.doc";
// 解决文件乱码问题
if (request.getHeader("User-Agent").toLowerCase().indexOf("firefox") > 0) {
fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1"); // firefox浏览器
} else {
fileName = URLEncoder.encode(fileName, "UTF-8");// IE浏览器
}
this.contentType = "application/msword";
// 获取资源路径
return ServletActionContext.getServletContext().getResourceAsStream("files/使用说明书.doc");
} else if (2 == number) {
this.fileName = "ModbusV2.0_down.mp4";
// 解决文件乱码问题
if (request.getHeader("User-Agent").toLowerCase().indexOf("firefox") > 0) {
fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1"); // firefox浏览器
} else {
fileName = URLEncoder.encode(fileName, "UTF-8");// IE浏览器
}
this.contentType = "video/mp4";
// 获取资源路径
return ServletActionContext.getServletContext().getResourceAsStream("mediaelement/media/ModbusV2.0_down.mp4");
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
return null;
} @Override
public String execute() throws Exception { return SUCCESS;
} @Override
public void setServletResponse(HttpServletResponse response) {
this.response = response;
} @Override
public void setServletRequest(HttpServletRequest request) {
this.request = request;
}
}
struts.xml文件配置：
<action name="FileDownload" class="com.fro.action.FileDownloadAction">
<result name="success" type="stream">
<param name="contentType">${contentType}</param>
<param name="contentDisposition">attachment;fileName="${fileName}"</param>
<param name="inputName">downloadFile</param>
<param name="bufferSize">1024</param>
</result>
</action>
下面是通用的下载方法，不过我这里还是用struts实现的：
DdownloadAction.java
package com.fro.action; import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder; import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware; import com.opensymphony.xwork2.ActionSupport; public class DdownloadAction extends ActionSupport implements ServletRequestAware, ServletResponseAware { /**
*
*/
private static final long serialVersionUID = 1L; private String contentType;// 文件类型
private String filename;// 指定下载后的文件名
private HttpServletRequest request;
private HttpServletResponse response; public InputStream getTargetFile() throws Exception { String realPath = request.getSession().getServletContext().getRealPath("/");
String filePath = realPath + "/mediaelement/media/ModbusV2.0_down.mp4";
System.out.println("filePath:" + filePath);
File file = new File(filePath); response.setContentType("application/octet-stream; charset=UTF-8");
String fileName = "ModbusV2.0_down.mp4";
// 解决中文文件名乱码问题
if (request.getHeader("User-Agent").toLowerCase().indexOf("firefox") > 0) {
fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1"); // firefox浏览器
} else {
fileName = URLEncoder.encode(fileName, "UTF-8");// IE浏览器
}
response.setHeader("Content-Disposition", "attachment;filename=" + fileName); InputStream in = new FileInputStream(file);
OutputStream out = response.getOutputStream();
byte[] data = new byte[1024];
int len = 0;
while ((len = in.read(data)) != -1) {
out.write(data, 0, len);
}
out.flush();
return null;
} public String execute() throws Exception { return SUCCESS; } public String getContentType() {
return contentType;
} public void setContentType(String contentType) {
this.contentType = contentType;
} public String getFilename() {
return filename;
} public void setFilename(String filename) {
this.filename = filename;
} public HttpServletRequest getRequest() {
return request;
} public void setRequest(HttpServletRequest request) {
this.request = request;
} public HttpServletResponse getResponse() {
return response;
} public void setResponse(HttpServletResponse response) {
this.response = response;
} @Override
public void setServletResponse(HttpServletResponse response) {
response.setCharacterEncoding("utf-8");
this.response = response;
} @Override
public void setServletRequest(HttpServletRequest request) {
this.request = request;
}
}
struts.xml文件配置：
<action name="download_*" class="com.fro.action.DdownloadAction" method="{1}">
<result name="success" type="redirect">/index.jsp</result>
</action>
下面是我的jsp文件：
<%@ 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>
<title>My JSP 'filedownload.jsp' starting page</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
--> </head> <body> <h2>文件下载内容：</h2>
<br /> 使用说明书.doc:
<a href="FileDownload.action?number=1">点击下载</a>
<br /> ModbusV2.0_down.mp4:
<a href="FileDownload.action?number=2">点击下载</a>
<br /> 使用说明书.doc:
<a href="download_getTargetFile.action">点击下载</a>
<br /> 使用说明书.doc:
<a href="file_download.action">点击下载</a> </body>
</html>
其中解决了下载文件文件名中文乱码问题。
其他方式：
//判断是否为火狐浏览器
String Agent = request.getHeader("User-Agent");
StringTokenizer st = new StringTokenizer(Agent,";");
st.nextToken();
//得到用户的浏览器类型
String userbrowser = st.nextToken();
//LOGGER.debug(userbrowser+"浏览器---------------------------");
//LOGGER.debug(userbrowser.trim().toLowerCase()+"浏览器类型---------------------------");
//LOGGER.debug(userbrowser.trim().toLowerCase().contains("wow64)")+"是否为火狐浏览器----------------------------");
if(userbrowser.toLowerCase().contains("wow64")){
response.setHeader("Content-Disposition", "attachment;filename="+ new String(fileName.getBytes("GB2312"),"ISO-8859-1"));
}else{
response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(realName, "UTF-8"));
}
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