struts2 上传文件，并限制文件大小及类型

最新推荐文章于 2017-05-15 15:44:48 发布

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本文介绍了一个使用Struts2框架实现文件上传的例子。通过配置web.xml和struts.xml文件，定义上传过滤器和动作，限制文件类型及大小，并展示了JSP页面与Java动作类的具体实现。

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web.xml：

<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>

struts.xml：

<struts>

<package name="struts2" extends="struts-default" >
<action name="upload" class="UploadAction">

<interceptor-ref name="defaultStack">
<param name="fileUpload.allowedTypes">image/png,image/gif,image/jpeg,image/jpg,image/x-png, image/pjpeg</param>
<param name="fileUpload.maximumSize">102400</param>
</interceptor-ref>
<result name="success">/result.jsp</result>
<result name="input">/upload.jsp</result>
</action>
</package>
</struts>

upload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<%
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>Struts2文件上传</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>
<center>
<h1>Struts 2完成上传</h1>
<form action="upload.action" method="post" enctype="multipart/form-data">
<table>
<tr>
<td>用户名:</td>
<td><input type="text" name="username" ></td>
</tr>
<tr>
<td>上传文件:</td>
<td><input type="file" name="myFile"></td>
</tr>
<tr>
<td>保存到指定目录:</td>
<td><input type="text" name="destinationPath">
<s:fielderror></s:fielderror> </td>
</tr>
<tr>
<td><input type="submit" value="上传"></td>
<td><input type="reset"></td>
</tr>
</table>
</form>
</center>
</body>
</html>

UploadAction.java

public class UploadAction extends ActionSupport {
// username属性用来封装用户名
private String username;

// myFile属性用来封装上传的文件
private File myFile;

//保存路径
private String destinationPath;

// myFileContentType属性用来封装上传文件的类型
private String myFileContentType;

// myFileFileName属性用来封装上传文件的文件名
private String myFileFileName;


//获得username值
public String getUsername() {
return username;
}

//设置username值
public void setUsername(String username) {
this.username = username;
}

//获得myFile值
public File getMyFile() {
return myFile;
}


//设置myFile值
public void setMyFile(File myFile) {
this.myFile = myFile;
}


public String getDestinationPath() {
return destinationPath;
}

public void setDestinationPath(String destinationPath) {
this.destinationPath = destinationPath;
}

//获得myFileContentType值
public String getMyFileContentType() {
return myFileContentType;
}

//设置myFileContentType值
public void setMyFileContentType(String myFileContentType) {
this.myFileContentType = myFileContentType;
}

//获得myFileFileName值
public String getMyFileFileName() {
return myFileFileName;
}

//设置myFileFileName值
public void setMyFileFileName(String myFileFileName) {
this.myFileFileName = myFileFileName;
}

public String execute() throws Exception {

//基于myFile创建一个文件输入流
InputStream is = new FileInputStream(myFile);

// 设置上传文件目录
// String uploadPath = ServletActionContext.getServletContext()
// .getRealPath("/upload");

String uploadPath = destinationPath;

// 设置目标文件
File toFile = new File(uploadPath, this.getMyFileFileName());

// 创建一个输出流
OutputStream os = new FileOutputStream(toFile);

//设置缓存
byte[] buffer = new byte[1024];

int length = 0;

//读取myFile文件输出到toFile文件中
while ((length = is.read(buffer)) > 0) {
os.write(buffer, 0, length);
}
System.out.println("上传用户"+username);
System.out.println("上传文件名"+myFileFileName);
System.out.println("上传文件类型"+myFileContentType);
//关闭输入流
is.close();

//关闭输出流
os.close();

return SUCCESS;
}

}

jar包如下：