SSH框架的简单上传功能的实现

1.创建项目。

2.导入开发包。

3.配置web.xml.

配置内容就是配置struct2的内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>

<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>

<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

</web-app>

4.编写上传文件的Action类：--首先我再webroot文件夹下建了一个upload的文件夹（项目源码中，上传的文件在服务器的该文件夹下）

public class FileUpAction {

//定义好下边的三个字段属性，其中类型跟文件名的前缀一样，file是前台接收的input框的name值跟该字段名一样，并生成get、set方法
//File类型，跟前台的name一致
private File abc;
//上传的文件类型
private String abcContentType;
//上传的文件名--原本的文件名
private String abcFileName;

//这是一个文件上传的类，可以直接是使用

private void doCopyFile(File srcFile, File destFile) throws IOException {
if (destFile.exists() && destFile.isDirectory()) {
throw new IOException("Destination '" + destFile + "' exists but is a directory");
}

FileInputStream fis = null;
FileOutputStream fos = null;
FileChannel input = null;
FileChannel output = null;
HttpServletRequest request = ServletActionContext.getRequest();
try {
fis = new FileInputStream(srcFile);
fos = new FileOutputStream(destFile);
input = fis.getChannel();
output = fos.getChannel();
long size = input.size();
long pos = 0;
long count = 0;
while (pos < size) {
//count = size - pos > FILE_COPY_BUFFER_SIZE ? FILE_COPY_BUFFER_SIZE : size - pos;
count = size - pos > 1024*1024*30 ? 1024*1024*30 : size - pos;

long percent = Math.round((double)pos/size*100);
request.getSession().setAttribute("percent", percent);

pos += output.transferFrom(input, pos, count);
}
} finally {
IOUtils.closeQuietly(output);
IOUtils.closeQuietly(fos);
IOUtils.closeQuietly(input);
IOUtils.closeQuietly(fis);
}

}

//写一个方法执行文件上传

public void upload() throws Exception{

String path = ServletActionContext.getRequest().getRealPath("/upload");

File destFile = new File(new File(path),abcFileName);

doCopyFile(abc, destFile);
}

public File getAbc() {
return abc;
}

public void setAbc(File abc) {
this.abc = abc;
}

public String getAbcContentType() {
return abcContentType;
}

public void setAbcContentType(String abcContentType) {
this.abcContentType = abcContentType;
}

public String getAbcFileName() {
return abcFileName;
}

public void setAbcFileName(String abcFileName) {
this.abcFileName = abcFileName;
}

}

5.配置structs.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">

<constant name="struts.devMode" value="false" />

<constant name="struts.multipart.saveDir" value="c:/upload" />

<constant name="struts.multipart.maxSize" value="99999999999" />

</action>

</package>

</struts>

6.前台去提交上传文件，我再index.jsp页面中测试

<%@ 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 'index.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">

</head>

<body>

<form action="fileup.action" method="post" enctype="multipart/form-data">
<input type="file" name="abc" /><br /> <input type="submit" id="btn"
value="提交" />
</form>

</body>
</html>

完成上边的就可以启动服务器去访问该项目，《《《《《注意提交后的文件到服务器的uoload文件夹中去了，你工作空间的项目文件夹下没有上传的文件