一、编写上传界面
<body> <form action="${pageContext.request.contextPath}/fileUploadAction" method="post" enctype="multipart/form-data"> 文件：<input type="file" name="file1"><br /> <input type="submit" value="上传"> </form> </body>
二、编写后台Action
public class FileUpload extends ActionSupport{ //文件：<input type="file" name="file1"><br /> private File file1; private String file1FileName; private String file1ContentType; public void setFile1(File file1) { this.file1 = file1; } public void setFile1FileName(String file1FileName) { this.file1FileName = file1FileName; } public void setFile1ContentType(String file1ContentType) { this.file1ContentType = file1ContentType; } @Override public String execute() throws Exception { /*****处理业务******/ //吧文件上传到upload目录 //获取上传的路径 String path = ServletActionContext.getServletContext().getRealPath("/upload"); File destFile = new File(path,file1FileName); FileUtils.copyFile(file1, destFile); return SUCCESS; } }
三、编写配置文件upload.xml(注意：class值用点分割)
<?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"> <struts> <package name="upload" extends="struts-default"> <!-- 注意class使用点 --> <action name="fileUploadAction" class="cn.itcast.e_fileupload.FileUpload"> <result name="success">/e/success.jsp</result> <!-- 配置错误视图 --> <result name="input">/e/error.jsp</result> </action> </package> </struts>
四、把upload.xml引入struts.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"> <struts> <!-- 总的配置文件，引入其他文件 --> <include file="cn/itcast/e_fileupload/upload.xml"></include> </struts>
五、配置（上传文件大小，以及类型）
1、struts默认上传大小是2M；当文件大于2M就会报错，此时可以配置错误视图error.jsp（可以显示错误）。
<body> error.jsp<br /> <!-- 查看错误信息 --> <%@ taglib uri="/struts-tags" prefix="s" %> <s:fielderror></s:fielderror> </body>
2、配置上传文件大小（struts-core-2.3.4.1.jar/org.apache.struts2/static/default.properties此文件包含常量设置）
在src目录下，新建constant.xml
<struts> <!-- 全局配置 --> <!-- 上传文件大小配置 :30M--> <constant name="struts.multipart.maxSize" value="31457280" /> </struts>
3、配置上传文件类型（配置拦截器）
<struts> <package name="upload" extends="struts-default"> <!-- 注意class使用点 --> <action name="fileUploadAction" class="cn.itcast.e_fileupload.FileUpload"> <!-- 配置文件上传的类型 --> <interceptor-ref name="defaultStack"> <param name="fileUpload.allowedExtensions">txt,jpg</param> </interceptor-ref> <result name="success">/e/success.jsp</result> <!-- 配置错误视图 --> <result name="input">/e/error.jsp</result> </action> </package> </struts>