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在Struts框架中，可以使用ActionForm来处理文件上传。以下是一个简单的示例，说明如何在ActionForm中处理文件上传：
- 首先，创建一个继承自
org.apache.struts.action.ActionForm的类，例如FileUploadForm。在这个类中，定义一个File类型的属性，例如file，用于存储上传的文件。
import org.apache.struts.action.ActionForm; import java.io.File; public class FileUploadForm extends ActionForm { private File file; // Getter and Setter methods for the file attribute public File getFile() { return file; } public void setFile(File file) { this.file = file; } } - 接下来，创建一个继承自
org.apache.struts.action.Action的类，例如FileUploadAction。在这个类中，重写execute()方法，用于处理文件上传。
import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import java.io.File; import java.io.IOException; public class FileUploadAction extends Action { @Override public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { FileUploadForm uploadForm = (FileUploadForm) form; File uploadedFile = uploadForm.getFile(); // Check if the file is selected if (uploadedFile != null && uploadedFile.getName().trim().length() > 0) { // Define the path to save the uploaded file String filePath = "/path/to/save/uploaded/files/"; File saveDir = new File(filePath); // Create the directory if it doesn't exist if (!saveDir.exists()) { saveDir.mkdir(); } // Define the file name String fileName = uploadedFile.getName(); // Save the uploaded file String filePathAndName = filePath + fileName; try { uploadedFile.renameTo(new File(filePathAndName)); } catch (IOException e) { e.printStackTrace(); return mapping.findForward("error"); } } else { return mapping.findForward("error"); } return mapping.findForward("success"); } } - 在
struts-config.xml文件中，配置FileUploadForm和FileUploadAction。
<struts-config> <!-- Other configurations --> <form-beans> <form-bean name="fileUploadForm" type="FileUploadForm" /> </form-beans> <action-mappings> <action path="/upload" type="FileUploadAction" name="fileUploadForm" scope="request"> <forward name="success" path="/success.jsp" /> <forward name="error" path="/error.jsp" /> </action> </action-mappings> </struts-config> - 在HTML表单中，使用
<html:form>标签创建一个表单，并设置enctype="multipart/form-data"以支持文件上传。使用<html:file>标签创建一个文件上传控件。
<!DOCTYPE html> <html> <head> <title>File Upload</title> </head> <body> <h1>File Upload</h1> <html:form action="/upload" method="post" enctype="multipart/form-data"> <html:file property="file" label="Upload File" /> <html:submit value="Upload" /> </html:form> </body> </html> 现在，当用户选择一个文件并点击“上传”按钮时，FileUploadAction将处理文件上传，并将文件保存到指定的目录。根据上传是否成功，用户将被重定向到success.jsp或error.jsp页面。
