struts2中的文件上传

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在 struts 2 的文件上传操作比 struts1 更简单方便。

struts1 的文件上传请看： http://blog.csdn.net/zhanggnol/archive/2011/01/05/6118895.aspx

本文讲解如何使用 struts2 上传文件。

步骤：

1 编写 jsp 页面

2 编写 Action ，处理文件上传功能

3 配置 struts.xml 文件

5 测试

1、 jsp 页面 —upload_form.jsp

<%@ page language = "java" contentType = "text/html; charset=ISO-8859-1"

pageEncoding = "ISO-8859-1" %>

<! DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" >

< html >

< head >

< meta http-equiv = "Content-Type" content = "text/html; charset=ISO-8859-1" >

< title > Upload File </ title >

</ head >

< body >

< form action = " upload.action " method = "post" enctype = " multipart/form-data " >

< input type = "file" name = "file" >

< input type = "submit" value = "Submit" />

</ form >

</ body >

</ html >

2 、编写 UploadAction 类，实现文件上传功能

public class UploadAction {

public static Logger logger = Logger.getLogger(UploadAction.class);

private File file;

public File getFile() {

return file;

}

public void setFile(File file) {

logger.debug("file set ... ");

this.file = file;

}

public String execute() {

try {

// 创建输入流

FileInputStream fis = new FileInputStream(file);

// 将文件保存 在服务器端的 "upload" 文件夹下

File outFile = new File(ServletActionContext.getServletContext()

.getRealPath("upload"), file.getName());

// 将输入流中的字节读出 通过输出流向保存的文件中写入

BufferedOutputStream bos = new BufferedOutputStream(

new FileOutputStream(outFile));

int b = -1;

while ((b = fis.read()) != -1) {

bos.write(b);

}

logger.debug("outFile path : " + outFile.getPath());

bos.close();

fis.close();

} catch (Exception e) {

e.printStackTrace();

return "fail";

}

return "success";

}

}

注意 1 ： struts2 与 struts1 不同，不需要单独的配置一个 ActionForm 。

注意 2 ：在 struts2 中，将页面提交的文件直接封装成一个 java.io.File 对象。

3 配置 struts.xml 文件

<? xml version = "1.0" encoding = "UTF-8" ?>

<! DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd" >

< struts >

< package name = "package-one" extends = "struts-default" namespace = "/one" >

< action name = "show" class = "zl.action.ShowAction" >

< result name = "success" > /upload_form.jsp </ result >

</ action >

< action name = "upload" class = "zl.action.UploadAction" >

< result name = "success" > /success.jsp </ result >

< result name = "fail" > show.action </ result >

</ action >

</ package >

</ struts >

4 测试

提交后，会将 Log4j 的信息打印在 console 上，文件保存的 path 。

21:47:00,343 DEBUG UploadAction:20 - file set ...

21:47:02,328 DEBUG UploadAction:35 - outFile path : D:/Program Files/tomcat6.0/webapps/test3/upload/upload_71f9e496_12d56642ee9__8000_00000001.tmp