Struts2 part 7：文件上传

最新推荐文章于 2025-12-01 13:49:36 发布

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本文介绍Struts2框架下的单文件与多文件上传实现方法，包括表单配置、Action处理逻辑及国际化错误消息配置。

1、单文件上传

页面表单MIME封装类型为enctype="multipart/form-data" ，提交方式为post，Struts2使用FileUpload实现文件上传

jsp

	<form action="${pageContext.request.contextPath}/demo01/upload1.action" method="post" enctype="multipart/form-data">
		<input type="file" name="upload"><br/> 
		<input type="submit">
	</form>

action，Action中必须定义三个变量，变量名称和jsp表单中的name属性对应，File类型的“xxx”、String类型的“xxxContentType”、String类型的“xxxFileName”

public class UploadAction1 extends ActionSupport {
	private File upload;
	private String uploadContentType;
	private String uploadFileName;

	@Override
	public String execute() throws Exception {
		File destFile = new File(ServletActionContext.getServletContext().getRealPath("/upload") + "/" + uploadFileName);
		FileUtils.copyFile(upload, destFile);
		return NONE;
	}

	public void setUpload(File upload) {
		this.upload = upload;
	}

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

	public void setUploadFileName(String uploadFileName) {
		this.uploadFileName = uploadFileName;
	}

}

配置

<package name="demo01" namespace="/demo01" extends="struts-default">
		<action name="upload1" class="demo01.UploadAction1"></action>
	</package>

2、文件上传的常量配置

通过fileUpload拦截器设置文件上传类型和大小，设置只对当前action有效

	<package name="demo01" namespace="/demo01" extends="struts-default">
		<action name="upload1" class="demo01.UploadAction1">
			<result name="input">/demo01/upload1.jsp</result>
			<interceptor-ref name="defaultStack">
				<param name="fileUpload.allowedExtensions">.mp3,.txt</param>
				<param name="fileUpload.maximumSize">6000000</param>
			</interceptor-ref>
		</action>
	</package>

在src目录下配置国际化资源文件messages.properties

struts.messages.error.content.type.not.allowed = \u6587\u4EF6\u7C7B\u578B\u9519\u8BEF
struts.messages.error.uploading = \u4E0A\u4F20\u51FA\u73B0\u9519\u8BEF
#struts.messages.error.file.too.large = \u6587\u4EF6\u592A\u5927

struts.messages.error.file.too.large =\u4E0A\u4F20\u6587\u4EF6{1}\u8D85\u8FC7\u5141\u8BB8\u5927\u5C0F{3}
struts.messages.error.file.extension.not.allowed=\u4E0A\u4F20\u6587\u4EF6\u540D\u6269\u5C55\u540D\u4E0D\u7B26\u5408\u8981\u6C42

struts.xml中注册使用

<constant name="struts.custom.i18n.resources" value="messages"></constant>

这种全局资源文件配置没有任何问题，但我在action的所在包中配置国际化文件却失败了

页面需要fielderror显示

	<s:fielderror></s:fielderror>
	<form action="${pageContext.request.contextPath}/demo01/upload1.action" method="post" enctype="multipart/form-data">
		<input type="file" name="upload"><br/> 
		<input type="submit">
	</form>

也可以在struts.xml中配置全局常量，但这错误信息需要actionerror显示

	<constant name="struts.multipart.maxSize" value="200000000"></constant>

3、多文件上传

jsp，上传文件的name属性一样

	<form action="${pageContext.request.contextPath}/demo01/upload2.action" method="post" enctype="multipart/form-data">
		<input type="file" name="upload"><br/> 
		<input type="file" name="upload"><br/> 
		<input type="file" name="upload"><br/> 
		<input type="submit">
	</form>

Action，在Action中使用数组接受

public class UploadAction2 extends ActionSupport {
	private File[] upload;
	private String[] uploadContentType;
	private String[] uploadFileName;

	@Override
	public String execute() throws Exception {
		for (int i = 0; upload != null && i < upload.length; i++) {
			File sourFile = upload[i];
			File destFile = new File(ServletActionContext.getServletContext().getRealPath("/upload") + "/" + uploadFileName[i]);
			FileUtils.copyFile(sourFile, destFile);
		}
		return NONE;
	}

	public void setUpload(File[] upload) {
		this.upload = upload;
	}

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

	public void setUploadFileName(String[] uploadFileName) {
		this.uploadFileName = uploadFileName;
	}

}

struts配置

<action name="upload2" class="demo01.UploadAction2">
			<result name="input">/demo01/upload2.jsp</result>
		</action>

所有的上传在操作之前需要判断是否有文件上传，防止空文件上传