struts2开发6--在struts2中实现单个文件上传

程序员文章站 2022-04-20 21:05:03

...

文件上传几乎是每个web应用程序的一个必须模块，文件上传的实现需要将表单元素属性enctype的值设置成multipart/form-data，这样使表单数据以二进制编码的方式提交。下面在struts2中提供一种上传文件的方式，供大家参考。

struts2中上传文件必须添加的的jar包：commons-fileupload-x.x.x.jar和common-io-x.x.x.jar

创建一个fileUpAction来处理要上传文件的文件，代码如下：

package cn.test.fileUp;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class fileUpAction extends ActionSupport {
private static final int BUFFER_SIZE=60*60;
private File upload;//封装上传文件域的属性
private String uploadContentType;//封装上传文件的类型
private String uploadFileName;//封装上传文件名
private String savePath;//封装文件上传的保存路径
/**
*
* @param source 源文件
* @param target 目标文件
* @throws IOException
*/
private static void copy(File source,File target) throws IOException
{
  InputStream inputStream=null;
  OutputStream outputStream = null;
  try {
   inputStream=new BufferedInputStream(new FileInputStream(source));
   outputStream=new BufferedOutputStream(new FileOutputStream(target),(int)source.length());
   byte[] buffer=new byte[BUFFER_SIZE];
   int length=0;
   while((length=inputStream.read(buffer))>0)
   {
    outputStream.write(buffer,0,length);

   }
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  if(inputStream!=null)
  {
  inputStream.close();
  }
  if(outputStream!=null)
  {
  outputStream.close();
  }
}
public String fileUpUI()
{
  return "fileUpUI";
}
@Override
public String execute() throws Exception {
  // TODO Auto-generated method stub
  String path1=ServletActionContext.getServletContext().getRealPath(this.getSavePath());
  File f = new File(path1);
  if(!f.exists())
  {
   f.mkdirs();
  }
  String path=path1+"\\"+this.getUploadFileName();
  System.out.println(path1);
  File target=new File(path);
  copy(this.upload,target);
  return "fsuccess";
}
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;
}
public static int getBufferSize() {
  return BUFFER_SIZE;
}
}
说明：在上述action中，用upload属性封装上传文件的内容，但却不能获得上传文件的类型和文件名称。因此需要使用uploadContentType来封装上传文件的类型，用uploadFileName来封装上传文件的名字，另外，配置一个savePath来封装文件保存的路径。

struts.xml文件配置如下：

<action name="file_*" class="cn.test.fileUp.fileUpAction" method="{1}">
        <param name="savePath">/upload</param>
        <result name="fileUpUI">/WEB-INF/jsp/fileUpUI.jsp</result>
        <result name="fsuccess">/WEB-INF/jsp/fsuccess.jsp</result>
        </action>

创建fileUpUI.jsp代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<s:form action="file_execute" namespace="/" enctype="multipart/form-data">
<s:file name="upload" label="文件"></s:file>
<s:submit value="确定"></s:submit>
</s:form>
</html>

创建fsuccess.jsp代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>

<html>

文件上传成功!
</html>

部署项目，在浏览器中输入：http://localhost:8080/MyWeb/file_fileUpUI，就可以实现上传文件功能。