Struts文件上传与下载详解_上传单个文件

<s:form action="upload.action" method="post" enctype="multipart/form-data">
      <s:textfield name="file" label="标题"/><br/>
      <s:file name="upload" label="选择文件"/><br/>
    </s:form>

package org.web;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
  private File upload;                       //封装上传文件的属性（单个）
  private String uploadContentType;          //封装上传文件的类型（单个）
  private String uploadFileName;             //封装上传文件的名称（单个）
  private String savePath;                   //获取文件上传的路径（单个）
  //实现文件的单个上传
  public String execute() throws IOException{
    byte[]by=new byte[1024];
    //获取物理路径"/upload"
    String path=ServletActionContext.getServletContext().getRealPath(savePath);
    FileInputStream in = new FileInputStream(getUpload());
    FileOutputStream out=new FileOutputStream(path+"\\"+getUploadFileName());
    int i=in.read(by);
    while(i>0){
      out.write(by,0,i);
      i=in.read(by);
    }
    in.close();
    out.flush();
    out.close();
    return SUCCESS;
  }
  public File getUpload() {
    return upload;
  }
  public void setUpload(File upload) {
    this.upload = upload;
  }
  public String getUploadContentType() {
    return uploadContentType;
  }
  public void setUploadContentType(String uploadContentType) {
    this.uploadContentType = uploadContentType;
  }
  public String getUploadFileName() {
    return uploadFileName;
  }
  public void setUploadFileName(String uploadFileName) {
    this.uploadFileName = uploadFileName;
  }
  public String getSavePath() {
    return savePath;
  }
  public void setSavePath(String savePath) {
    this.savePath = savePath;
  }
}