Struts2文件上传

最新推荐文章于 2021-05-31 23:17:54 发布

刘莅

最新推荐文章于 2021-05-31 23:17:54 发布

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分类专栏： Struts2 Servlet 文章标签： Struts2

本文链接：https://blog.youkuaiyun.com/nuoWei_SenLin/article/details/53700006

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本文介绍使用Struts2框架实现单文件及批量文件上传的方法。通过具体代码示例展示了如何配置Struts2来处理文件上传请求，包括上传单个文件和多个文件，并设置最大文件大小限制。

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单文件上传

UplaodAction.java

public class UploadAction extends ActionSupport {
	private File file;	//InputName
	private String fileFileName;	//格式：InputName+”FileName”
	private String fileContentType;	//格式：InputName+”ContentType”.
	public String upload() throws IOException{
		HttpServletRequest request = ServletActionContext.getRequest();	//得到request
		String path = request.getRealPath("/upload");	//将文件上传到upload文件夹下，返回虚拟路径在硬盘上的绝对路径
		InputStream is = new FileInputStream(file);	//Input流
		OutputStream os = new FileOutputStream(new File(path,fileFileName));//上传的文件保存的位置
		int len = 0;
		byte [] buffer = new byte[1024];
		while((len = is.read(buffer)) != -1){
			os.write(buffer,0,len);
		}
		is.close();
		os.close();
		return Action.SUCCESS;
	}
	//省略get set方法
}

Upload.jsp

 <form action="/Upload/aaa/upload" method="post" enctype="multipart/form-data">
   		文件：<input type="file" name="file"></br>   <!--name属性与Action中的private File file对应 -->
   		<input type="submit" value="上传">
   </form>

struts.xml配置

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    <constant name="struts.devMode" value="true" />
    <!-- 设置临时目录 -->
	<constant name="struts.multipart.saveDir" value="c:\"></constant>
	<!-- 设置上传文件的最大大小，>=maximumSize -->
	<constant name="struts.multipart.maxSize" value="20971520"></constant>
	
    <package name="default" namespace="/aaa" extends="struts-default">
        <action name="upload" class="cn.sxt.action.UploadAction" method="upload">
           <result>/index.jsp</result>
           <interceptor-ref name="fileUpload">	<!-- 应用fileUpload过滤器 -->
           		<param name="maximumSize">20971520</param>	<!-- 设置上传文件的最大大小 -->
           </interceptor-ref>
           <interceptor-ref name="defaultStack"></interceptor-ref>
        </action>
    </package>
    <include file="example.xml"/>
</struts>

批量文件上传

UploadMoreAction.java

public class UploadMoreAction extends ActionSupport {
	private File [] file;	//因为上传多个文件，inputName一样，所以是数组形式
	private String[]fileFileName;
	private String []fileContentType;
	
	public String uploadMore() throws IOException{
		HttpServletRequest request = ServletActionContext.getRequest();
		String path = request.getRealPath("upload");//上传文件保存的路径
		for(int i = 0;i<file.length;i++){
			InputStream is = new FileInputStream(file[i]);
			OutputStream os = new FileOutputStream(new File(path,fileFileName[i]));
			int len = 0;
			byte []buffer = new byte[1024];
			while((len = is.read(buffer)) != -1){
				os.write(buffer,0,len);
			}
			is.close();
			os.close();
		}
		return Action.SUCCESS;
	}
	//shenglveget
}

UploadMore.jsp

<form action="/Upload/aaa/uploadmore" method="post" enctype="multipart/form-data">
    	<input type="file" name="file"></br>
    	<input type="file" name="file"></br>
    	<input type="file" name="file"></br> <!--inputName保持一致  -->
    	<input type="submit" value="上传">
    </form>

struts.xml配置

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    <constant name="struts.devMode" value="true" />
    <!-- 设置临时目录 -->
	<constant name="struts.multipart.saveDir" value="c:\"></constant>
	<!-- 设置上传文件的最大大小，>=maximumSize -->
	<constant name="struts.multipart.maxSize" value="20971520"></constant>
	
    <package name="default" namespace="/aaa" extends="struts-default">
        <action name="upload" class="cn.sxt.action.UploadMoreAction" method="upload">
           <result>/index.jsp</result>
           <interceptor-ref name="fileUpload">	<!-- 应用fileUpload过滤器 -->
           		<param name="maximumSize">20971520</param>	<!-- 设置上传文件的最大大小 -->
           </interceptor-ref>
           <interceptor-ref name="defaultStack"></interceptor-ref>
        </action>
    </package>
    <include file="example.xml"/>
</struts>