struts 2 Commons FileUpload文件上传

1.首先在action中写如下代码

/* * fileupload,fileuploadFileName,fileuploadContentType命名规则，否则无法取值 * fileupload为客户端input上传组件的name,fileuploadFileName文件名称是fileupload+FileName组成，必须这样 * fileuploadContentType 文件类型是fileupload+ContentType组成，必须这样写 */private File fileupload;//上传的文件private String fileuploadFileName;//文件的名称 如上传的文件是a.png 则fileuploadFileName值为"a.png"private String fileuploadContentType;//文件的类型 如上传的是png格式的图片，则fileuploadContentType值为"image/png"/* * 指定上传文件在服务器上的保存目录，需要在Action中为定义savePath变量并为其添加相应的setter和getter方法 * 便于Struts2将struts.xml中的<param name="savePath">uploads/</param>值赋给savePath属性 */private String savePath;//文件的保存位置public String uploadFile() throws Exception {String absolutePath = ServletActionContext.getServletContext().getRealPath(""); // 获取项目根路径//文件路径String path = absolutePath + "/" + this.savePath + "/";//创建路径，如果目录不存在，则创建File file = new File(path);if(!file.exists()) {file.mkdirs();}//文件路径+文件名path +=this.getFileuploadFileName();//1.构建输入流 FileInputStream fis = new FileInputStream(fileupload);//2.构建输出流 FileOutputStream fos = new FileOutputStream(path);//3.通过字节写入输出流 try {byte[] buf = new byte[1024];int len = 0;while ((len = fis.read(buf)) > 0) {fos.write(buf, 0, len);}} catch (Exception e) {e.printStackTrace();} finally {fis.close();fos.close();}return SUCCESS; }@JSON(serialize = false)public File getFileupload() {return fileupload;}public void setFileupload(File fileupload) {this.fileupload = fileupload;}@JSON(serialize = false)public String getSavePath() {return savePath;}public void setSavePath(String savePath) {this.savePath = savePath;}public String getFileuploadFileName() {return fileuploadFileName;}public void setFileuploadFileName(String fileuploadFileName) {this.fileuploadFileName = fileuploadFileName;}public String getFileuploadContentType() {return fileuploadContentType;}public void setFileuploadContentType(String fileuploadContentType) {this.fileuploadContentType = fileuploadContentType;} 

2.在struts.xml中写入：

<action name="uploadFile" class="authResourcesAction" method="uploadFile"><!-- 配置 fileupload 的拦截器 --><interceptor-ref name="fileUpload"><!-- 可以支持上传的文件类型 --><param name="allowedTypes">image/bmp,image/png,image/gif,image/jpeg,image/jpg</param><!-- 设置上传文件的大小不能超过1M --><param name="maximumSize">1024*1024</param></interceptor-ref><!-- 必须配置系统默认的拦截器 --><interceptor-ref name="defaultStack" /><!-- 设置上传文件的默认保存路径 --><param name="savePath">uploads</param><result name="input">/customer/addNew.jsp</result><result name="success" type="redirect">/userMgr/userInfo.jsp</result></action> 

3.客户端jsp页面中：

<s:form action ="uploadFile" method ="POST" enctype ="multipart/form-data"> <s:file name ="fileupload"/> <s:submit value="上传" label="upload"/> </s:form> 

*注意：form表单一定要是：method ="POST" enctype ="multipart/form-data"