第一步：首先写个上传文件的页面（简单的一个form表单）
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>文件上传</title> </head> <body> <h1>文件上传</h1> <br><br> <form action="/Struts2-day02pm/upload/one_upload.action" method="post" enctype="multipart/form-data"> 文件上传1：<br><br> <input type="file" name="oneFile"><br><br> <input type="submit" value="开始上传"> </form> </body>
第二步：创建一个基类BaseAction.java,继承ActionSupport，并实现ServletRequestAware,ServletResponseAware,ServletContextAware三个接口，重写三个接口的set方法
public class BaseAction extends ActionSupport implements ServletRequestAware,ServletResponseAware,ServletContextAware{ /** * 编写一个基类，继承ActionSupport并实现相应的接口 * 以后的Action直接继承该类，就可以简单获取到Servlet API * 这是一个典型的适配设计模式 * @author Owen */ private static final long serialVersionUID = 7267018575222346353L; @Override public void setServletContext(ServletContext servletContext) { } @Override public void setServletResponse(HttpServletResponse response) { } @Override public void setServletRequest(HttpServletRequest request) { } }
第三步：创建OneUploadAction请求处理类，继承BaseAction
public class OneUploadAction extends BaseAction { private static final long serialVersionUID = -4445894434193884175L; // 该属性名必须和<input type="file" name="oneFile">中name值一致 private File oneFile; // 真实名称 private String oneFileFileName; // 文件类型 private String oneFileContentType; private HttpServletRequest request; @Override public void setServletRequest(HttpServletRequest request) { this.request = request; } @Override public String execute() throws Exception { // 获取保存上传文件在服务器的真是路径 String uploadPath = request.getServletContext().getRealPath("upload"); System.out.println(uploadPath);//目录真是路径 System.out.println("oneFile--"+oneFile.getName());//文件临时名称 System.out.println("oneFileFileName--"+oneFileFileName);//文件原始名称 System.out.println("oneFileContentType--"+oneFileContentType);//文件类型 // 第一种：该步骤适合上传小文件 // 将临时文件复制到硬盘上的真是路径 /* File file = new File(uploadPath, oneFileFileName);//拼接文件的存放路径和存放文件的真实名称 FileUtils.copyFile(oneFile, file);//将临时文件复制到上面这个路径 */ // 第二种：适合大文件上传操作 /*InputStream is = null; OutputStream os = null; is = new FileInputStream(oneFile); os = new FileOutputStream(new File(uploadPath,oneFileFileName)); byte[] buffer = new byte[500]; int length = 0; while((length=is.read(buffer,0,buffer.length)) != -1){ os.write(buffer, 0,length); } os.close(); is.close();*/ copyFile(uploadPath); return SUCCESS; } public void copyFile(String uploadPath){ InputStream is = null; OutputStream os = null; try { is = new FileInputStream(oneFile); os = new FileOutputStream(new File(uploadPath,oneFileFileName)); byte[] buffer = new byte[500]; int len = 0; while((len=is.read(buffer,0,buffer.length)) != -1){ os.write(buffer, 0,len); } os.close(); is.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public File getOneFile() { return oneFile; } public void setOneFile(File oneFile) { this.oneFile = oneFile; } public String getOneFileFileName() { return oneFileFileName; } public void setOneFileFileName(String oneFileFileName) { this.oneFileFileName = oneFileFileName; } public String getOneFileContentType() { return oneFileContentType; } public void setOneFileContentType(String oneFileContentType) { this.oneFileContentType = oneFileContentType; } }
第三步：配置struts.xml文件
<struts>
<package name="upload-default" namespace="/upload" extends="struts-default">
<action name="one_upload" class="com.struts2.day02pm.action.OneUploadAction">
<result>/WEB-INF/jsp/one_upload_ok.jsp</result>
</action>
</package>
</struts>
第四步：浏览器测试