基于Struts文件上传(FormFile)详解

<form action="/StrutsFileUpAndDown/register.do" method="post" enctype="multipart/form-data"> 名字：<input type="text" name="name" /> 头像:<input type="file" name="file"/> <input type="submit" value="注册用户"> </form>

/* * Generated by MyEclipse Struts * Template path: templates/java/JavaClass.vtl */package com.yourcompany.struts.form; import javax.servlet.http.HttpServletRequest;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionMapping;import org.apache.struts.upload.FormFile; /** * MyEclipse Struts * Creation date: 08-24-2017 * * XDoclet definition: * @struts.form name="userForm" */public class UserForm extends ActionForm { /*  * Generated Methods  */  private String username; private FormFile file;   public String getUsername() {  return username; } public void setUsername(String username) {  this.username = username; } public FormFile getFile() {  return file; } public void setFile(FormFile file) {  this.file = file; } }

UserForm userForm = (UserForm) form;String username = userForm.getUsername();FormFile file = userForm.getFile(); //通过formFile可以获取关于用户上传文件的各种信息//用于获取文件名字String fileName = file.getFileName();//用于获取文件大小int fileSize = file.getFileSize();

try { //获取输入流 is = file.getInputStream();  //得到输出流 //1.得到file文件夹，上传到tomcat服务器后的绝对路径(file文件为新创建的文件夹） String filePath = this.getServlet().getServletContext().getRealPath("/file"); //两个"//"的其中一个"/"为转义符  os=new FileOutputStream(filePath+"//"+fileName);   int len=0;//表示读取的字节 //做一个缓存，防止文件过大而造成错误 byte[] buff=new byte[1024]; while((len=is.read(buff))!=-1) {  os.write(buff,0,len); } is.close(); os.close();}