Struts2文件上传、单文件、多文件上传【Struts2】

最新推荐文章于 2021-10-15 17:05:09 发布

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最新推荐文章于 2021-10-15 17:05:09 发布

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分类专栏： JAVA 文章标签： struts upload action string buffer file

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本文介绍了使用 Struts2 实现文件上传的技术细节，包括单文件上传与多文件上传的 JSP 页面、Action 类以及配置文件的编写。对比 Struts1 的实现方式，阐述了 Struts2 在简化耦合度和代码量上的优势。

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内容是struts2的文件上传汇总，包括单文件和多文件上传，记录下来，留作备份

Struts1实现文件上传的文章（http://blog.youkuaiyun.com/itwit/article/details/7031371）

1、单文件上传

1）JSP页面（simple.jsp）

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

<html>
  <body>
    <H1><s:actionmessage/></H1>
  	<s:form action = "simpleAction" enctype="multipart/form-data">
  		<s:file name = "upload" label = "请输入要传入的文件名"></s:file>
  		<s:submit value = "save"></s:submit>
  	</s:form>
  </body>
</html>

2）Action（SimpleUploadAction）

package upload.singleUpload;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import com.opensymphony.xwork2.ActionSupport;

public class SimpleUploadAction extends ActionSupport {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private File upload;//上传的文件
	private String uploadFileName;//上传的文件名称
	private String uploadContentType;//上传的文件类型

	@Override
	public String execute() throws Exception {
		
		InputStream in = new FileInputStream(upload);
		OutputStream out = new FileOutputStream("d:\\"+uploadFileName);
		byte[] buffer = new byte[8192];
		int count = 0;
		while((count = in.read(buffer)) > 0){
			out.write(buffer,0,count);
		}
        out.close();
        in.close();
        this.addActionMessage("上传成功");
        return SUCCESS;
        
	}
	
	public File getUpload() {
		return upload;
	}
	public void setUpload(File upload) {
		this.upload = upload;
	}
	public String getUploadFileName() {
		return uploadFileName;
	}
	public void setUploadFileName(String uploadFileName) {
		this.uploadFileName = uploadFileName;
	}
	public String getUploadContentType() {
		return uploadContentType;
	}
	public void setUploadContentType(String uploadContentType) {
		this.uploadContentType = uploadContentType;
	}
}

3）Struts配置文件（struts.xml）

<action name="simpleAction" class = "upload.singleUpload.SimpleUploadAction">
   <result name = "success">/upload/simple/simple.jsp</result>
   <result name = "input">/upload/simple/simple.jsp</result>
 </action>

2、多文件上传
1）JSP页面（mutity.jsp）

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

<html>
  <head>
  	<script language="javascript">

		function addComponent()
		{
		        var uploadHTML = document.createElement( "<input type='file'  name='upload'/>");
		        document.getElementById("files").appendChild(uploadHTML);
		        uploadHTML = document.createElement( "<p/>");
		        document.getElementById("files").appendChild(uploadHTML);
		}
		</script>
  	
  </head>
  <body>
    <input type="button" οnclick="addComponent();" value="添加文件" />
        <br />
        <form action="mutityUpload.action"
            method="post" enctype="multipart/form-data">
            <span id="files"> 
            <input type='file' name='upload' />
            </span>
            <input type="submit" value="上传" />
        </form>
  </body>
</html>

2）Action（MutityUploadAction）

package upload.mutityUpload;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

import com.opensymphony.xwork2.ActionSupport;

public class MutityUploadAction extends ActionSupport {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private List<File> upload;
	private List<String> uploadFileName;
	private List<String> uploadContentType;

	@Override
	public String execute() throws Exception {
		
		for(int i = 0;upload != null && i<upload.size();i++){
			File file = upload.get(i);
			InputStream in = new FileInputStream(file);
			OutputStream out = new FileOutputStream("d:\\"+uploadFileName.get(i));
			byte[] buffer = new byte[8192];
			int count = 0;
			while((count = in.read(buffer)) > 0){
				out.write(buffer,0,count);
			}
			out.close();
	        in.close();
			
		}

        this.addActionMessage("上传成功");
        return SUCCESS;
        
	}
	

	public List<File> getUpload() {
		return upload;
	}


	public void setUpload(List<File> upload) {
		this.upload = upload;
	}


	public List<String> getUploadFileName() {
		return uploadFileName;
	}


	public void setUploadFileName(List<String> uploadFileName) {
		this.uploadFileName = uploadFileName;
	}


	public List<String> getUploadContentType() {
		return uploadContentType;
	}


	public void setUploadContentType(List<String> uploadContentType) {
		this.uploadContentType = uploadContentType;
	}
}

3）Struts配置文件（struts.xml）

<action name="mutityUpload" class = "upload.mutityUpload.MutityUploadAction">
  <result name = "success">/upload/mutity/mutity.jsp</result>
  <result name = "input">/upload/mutity/mutity.jsp</result>
</action>

经过对struts1和2的文件上传学习，总结两者的区别为：

struts2中不需要再单独定义form，在action中可以定义action需要用到的属性

struts1文件上传使用的类是FileForm，struts2使用的类是File

struts2较struts1降低了耦合度，却也增加了action的代码量，总体上来说是简洁了不少。