Struts2实现多文件上传

form表单：

<form action="userAction_register" method="post" name="register_form" enctype="multipart/form-data"><dl class="clearfix"><dt>用户名:</dt><dd><input type="text" name="userName" /></dd></dl><dl class="clearfix"><dt>密码:</dt><dd><input type="text" name="passWord" /></dd></dl><dl class="clearfix"><dt>日期:</dt><dd><input type="text" name="reDate" /></dd></dl><dl class="clearfix"><dt>坐标:</dt><dd><input type="text" name="point" /></dd></dl><dl><dl class="clearfix"><dt>头像:</dt><dd><input type="file" name="userFile" /><input type="file" name="userFile" /></dd></dl><dl>  <dt> </dt>  <dd><input type="submit" value="注册"/></dd>  <dd><input type="reset" value="重置"/></dd></dl></form>

Action类：

public class UserAction implements ModelDriven {private User user = new User();private Date reDate;private Point point;private File[] userFile;// 得到上传的文件private String[] userFileContentType;// 得到文件类型private String[] userFileFileName;// 得到文件名称public Point getPoint() {return point;}public void setPoint(Point point) {this.point = point;}public File[] getUserFile() {return userFile;}public void setUserFile(File[] userFile) {this.userFile = userFile;}public String[] getUserFileContentType() {return userFileContentType;}public void setUserFileContentType(String[] userFileContentType) {this.userFileContentType = userFileContentType;}public String[] getUserFileFileName() {return userFileFileName;}public void setUserFileFileName(String[] userFileFileName) {this.userFileFileName = userFileFileName;}public Date getReDate() {return reDate;}public void setReDate(Date reDate) {this.reDate = reDate;}public String login() throws Exception {System.out.println(user.getUserName());System.out.println(user.getPassWord());String result = "error";if (new serviceImpl().isLogin(user)) {result = "success";}return result;}public String register() throws Exception{System.out.println(reDate);String result="error";System.out.println(user.getUserName());System.out.println(user.getPassWord());//service service=new serviceImpl();//int id=service.addUser(user);//if(id>0){//result="success";//}if(this.point==null){System.out.println("null");}else{System.out.println(this.point.getX());System.out.println(this.point.getY());}String realpath = ServletActionContext.getServletContext().getRealPath("/images");File file = new File(realpath);if(!file.exists()) file.mkdirs();for(int i=0 ;i<userFile.length; i++){ File uploadImage = userFile[i];    FileUtils.copyFile(uploadImage, new File(file, userFileFileName[i]));}return "success";}@Overridepublic Object getModel() {return user;}}

上传后显示图片：

<img alt="" src="images/<s:property value='userFileFileName'/>"/>

总结关键代码：

<form action="userAction_register" method="post" name="register_form" enctype="multipart/form-data">//关键代码：“enctype="multipart/form-data”<dl class="clearfix"><dt>头像:</dt><dd><input type="file" name="userFile" />//关键代码：“name="userFile"”<input type="file" name="userFile" /></dd></dl><dl>  <dt> </dt>  <dd><input type="submit" value="注册"/></dd>  <dd><input type="reset" value="重置"/></dd></dl></form>

public class UserAction implements ModelDriven {private File[] userFile;// 得到上传的文件private String[] userFileContentType;// 得到文件类型private String[] userFileFileName;// 得到文件名称public File[] getUserFile() {return userFile;}public void setUserFile(File[] userFile) {this.userFile = userFile;}public String[] getUserFileContentType() {return userFileContentType;}public void setUserFileContentType(String[] userFileContentType) {this.userFileContentType = userFileContentType;}public String[] getUserFileFileName() {return userFileFileName;}public void setUserFileFileName(String[] userFileFileName) {this.userFileFileName = userFileFileName;}public String register() throws Exception{String realpath = ServletActionContext.getServletContext().getRealPath("/images");File file = new File(realpath);if(!file.exists()) file.mkdirs();for(int i=0 ;i<userFile.length; i++){ File uploadImage = userFile[i];    FileUtils.copyFile(uploadImage, new File(file, userFileFileName[i]));}return "success";}@Overridepublic Object getModel() {return user;}}