1、首先我们定义struts.properties的文件上传中的规则如下
struts.action.extension=action <!--以.action为我们提交的后缀名-->
struts.multipart.saveDir=c:/shengsiyuan <!--保存我们上传文件的临时目录，此文件夹下面会生成临时文件，以.tmp为后缀名-->
struts.multipart.maxSize=1048576000 <!--规定文件的大小-->当然以上文件的大小界定我们还可以这样在struts.xml文件中定义如下<struts>
<constant name="struts.multipart.maxSize" value="1048576000"></constant>
</struts>2、页面fileUpload.jsp用于上传文件<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'fileUpload.jsp' starting page</title>
<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>
<form action="fileUpload.action" method="post" enctype="multipart/form-data">
username: <input type="text" name="username"><br>
file: <input type="file" name="file"><br>
<input type="submit" value="submit">
</form>
</body>
</html>3、UploadAction.java 用于处理上传的文件的actionpackage com.shengsiyuan.struts2;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport
{
private String username; //传入的username
private File file; //以File为类型的file
private String fileFileName; //小心命名，以file开头FileName固定
private String fileContentType;
public String getUsername()
{
return username;
}
public void setUsername(String username)
{
this.username = username;
}
public File getFile()
{
return file;
}
public void setFile(File file)
{
this.file = file;
}
public String getFileFileName()
{
return fileFileName;
}
public void setFileFileName(String fileFileName)
{
this.fileFileName = fileFileName;
}
public String getFileContentType()
{
return fileContentType;
}
public void setFileContentType(String fileContentType)
{
this.fileContentType = fileContentType;
}
@Override
public String execute() throws Exception
{
String root = ServletActionContext.getRequest().getRealPath("/upload");//定义上传文件的路径
InputStream is = new FileInputStream(file);
//这里查看上传文件临时路径、以及临时文件的名字，在struts.properties已规定
System.out.println("path: " + file.getAbsolutePath());
System.out.println("file: " + file.getName());
//这里查看文件的真实名称
System.out.println("fileFileName: " + fileFileName);
File destFile = new File(root, fileFileName);
OutputStream os = new FileOutputStream(destFile);
byte[] buffer = new byte[400];//定义以400字节的速度上传文件
int length = 0;
while(-1 != (length = is.read(buffer)))
{
os.write(buffer, 0, length);
// Thread.sleep(1000);//为了能够查看临时文件存在，定义线程延时1秒
}
is.close();
os.close();
return SUCCESS;
}
}4、结果展示页fileUploadResult.jsp<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'fileUploadResult.jsp' starting page</title>
<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>
username: <s:property value="username"/><br>
name:<s:property value="fileFileName"/>
<br>
type:<s:property value="fileContentType"/>
</body>
</html>5、忘记struts.xml文件的配置了，你自己添加把