struts2实现上传文件（单个、多个）-优快云博客

本文详细介绍了如何使用Java实现单个文件和多个文件的上传功能，包括上传过程、服务器配置、展示上传成功信息以及下载文件的方法。对于上传多个文件的情况，文章提供了相应的jsp页面和Java代码调整，并展示了在不同浏览器上的效果。

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上传单个文件：

action类：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {
private File upload;
private String uploadFileName;
private String uploadContentType;

//get set方法省略

public void setUploadContentType(String uploadContentType) {
this.uploadContentType = uploadContentType;
}

public String execute() throws Exception {
InputStream is = new FileInputStream(upload);
OutputStream os = new FileOutputStream("d:\\Aggressive\\" + uploadFileName);
byte buffer[] = new byte[8192];

int count = 0;
while ((count = is.read(buffer)) > 0) {
os.write(buffer, 0, count);
}
os.close();
is.close();
return SUCCESS;
}
}

jsp页面：

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>上传单个文件</title>
</head>
<body>
<s:form action="upload" namespace="/test" enctype="multipart/form-data">
<s:file name="upload" label="输入要上传的文件名" />
<s:submit value="上传" />
</s:form>
</body>
</html>

上传成功的jsp页面：

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>上传成功</title>
</head>
<body>
上传成功
<br/>
<s:property value="uploadFileName"/>
</body>
</html>

在struts.xml文件中进行配置，然后启动服务器

输入项目地址运行项目，上传文件验证即可

可以在其他机器上访问服务器，上传文件看看效果，此时其他机器上的相应文件就会上传到服务器上，在服务器上的位置就是由OutputStream os = new FileOutputStream("d:\\Aggressive\\" + uploadFileName);这句代码指定的

上传多个文件时jsp页面改动较大：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>上传多个文件</title>
<script language="javascript">
function addComponent() {
var uploadHTML = document
.createElement("<input type='file' name='upload'/>");
document.getElementById("files").appendChild(uploadHTML);
uploadHTML = document.createElement("<p/>");
document.getElementById("files").appendChild(uploadHTML);
}
</script>
</head>
<body>
<input type="button" onclick="addComponent();" value="添加文件" />
<br />
<form onsubmit="return true;" action="/Study/UploadMore.action"
method="post" enctype="multipart/form-data">
<span id="files"> <input type='file' name='upload' />
<p /> </span> <input type="submit" value="上传" />
</form>
</body>

而java页面只需设置几个List存储相关的文件、文件名、文件类型即可

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import com.opensymphony.xwork2.ActionSupport;

public class UploadMore extends ActionSupport {
private List<File> upload;
private List<String> uploadFileName;
private List<String> uploadContentType;

//get set方法省略

public String execute() throws Exception {
if (upload != null) {
int i=0;
for(;i<upload.size();i++){
InputStream is = new FileInputStream(upload.get(i));
OutputStream os = new FileOutputStream("d:\\Aggressive\\" + uploadFileName.get(i));
byte buffer[] = new byte[8192];

int count=0;
while((count=is.read(buffer))>0)
os.write(buffer,0,count);
os.close();
is.close();
}
}
return SUCCESS;
}
}