struts2文件上传1

  <form  action="hello/UploadAction_upload.action" enctype="multipart/form-data" method="post">
  单文件上传：<input name="myfile" value="请选择文件" type="file"><br>
  <input type="submit" >
  <form>

public class UploadAction extends ActionSupport{

    //表单上提供的字段
    private File myfile;
    //struts2在文件上传时提供的属性    
    private String myfileFileName;//上传的文件名。上传字段名称+FileName  注意大小写
    private String myfileContentType;//上传文件的MIME类型。上传字段名称+ContentType 注意大小写
    public String upload(){

        String path= myfile.getAbsolutePath();
        System.out.println("临时文件路径："+path);
        System.out.println("文件名："+myfileFileName);
        System.out.println("文件类型："+myfileContentType);
        //1.拿到ServletContext
        ServletContext servletContext = ServletActionContext.getServletContext();
        //2.调用realPath方法，获取根据一个虚拟目录得到的真实目录    
        String realPath = servletContext.getRealPath("/WEB-INF/file");
        System.out.println(realPath);
        //3.如果这个真实的目录不存在，需要创建
        File file = new File(realPath );
        if(!file.exists()){
            file.mkdirs();
        }
        //4.把文件存过去
        //拷贝：把文件的临时文件复制到指定的位置。注意：临时文件还在
        //FileUtils.copyFile(myfile, new File(file,myfileFileName));

        //剪切：把临时文件剪切指定的位置，并且给他重命名。 注意：临时文件没有了
        myfile.renameTo(new File(file,myfileFileName));
        return SUCCESS;
    }
    
    public File getMyfile() {
        return myfile;
    }
    public void setMyfile(File myfile) {
        this.myfile = myfile;
    }
    public String getMyfileFileName() {
        return myfileFileName;
    }
    public void setMyfileFileName(String myfileFileName) {
        this.myfileFileName = myfileFileName;
    }
    public String getMyfileContentType() {
        return myfileContentType;
    }
    public void setMyfileContentType(String myfileContentType) {
        this.myfileContentType = myfileContentType;
    }
}

<!-- 文件上传 -->
        <action name="UploadAction_*" class="uploadfile.UploadAction" method="{1}">
           <interceptor-ref name="defaultStack">
              <!-- 允许文件类型 -->
              <!--  <param name="fileUpload.allowedTypes">image/jpg,image/pjpeg,image/png</param> -->   
             <!-- 允许的文件后缀 -->
             <param name="fileUpload.allowedExtensions">jpg,jpeg,gif,java</param>
           </interceptor-ref>
           <result>../MyJsp.jsp</result>
        </action>

result：