基于Struts FormFile上传文件
有关文件上传的控件可能非常多，比如有用于学习的SmartUpload、性能非常好的COS组件、有Apache的FileUpload组件、有Struts的FormFile组件、有Spring上传文件，还有其他一些开发的控件等等。假如你是用Struts，那基于Struts FormFile组件应该是一个不错的选择。
Struts FormFile跟Struts ActionForm结合得非常好，使用起来也非常简单，但是，对于同时上传多个附件，那就有点麻烦了！不管怎么样，它还是一个好东西，关键看大家怎么看待他了！
第一步，我们创建一个新的Struts工程，创建一个FileUploadForm，FileUploadForm如下所示：
程序代码
package zizz
.struts
;
import org .apache .struts .action .ActionForm ;
import org .apache .struts .upload .FormFile ;
public class FileUploadForm extends ActionForm {
private static final long serialVersionUID = -7794872310588861856L ;
private FormFile uploadFile ;
public FormFile getUploadFile ( ) {
return uploadFile ;
}
public void setUploadFile (FormFile uploadFile ) {
this .uploadFile = uploadFile ;
}
}
import org .apache .struts .action .ActionForm ;
import org .apache .struts .upload .FormFile ;
public class FileUploadForm extends ActionForm {
private static final long serialVersionUID = -7794872310588861856L ;
private FormFile uploadFile ;
public FormFile getUploadFile ( ) {
return uploadFile ;
}
public void setUploadFile (FormFile uploadFile ) {
this .uploadFile = uploadFile ;
}
}
第二步，创建一个Action，用于处理上传的文件及保存在服务器的路径，FileUploadAction文件内容如下
程序代码
package zizz
.struts
;
import java .io .FileOutputStream ;
import java .io .IOException ;
import java .io .InputStream ;
import java .io .OutputStream ;
import javax .servlet .http .HttpServletRequest ;
import javax .servlet .http .HttpServletResponse ;
import org .apache .struts .action .Action ;
import org .apache .struts .action .ActionForm ;
import org .apache .struts .action .ActionForward ;
import org .apache .struts .action .ActionMapping ;
import org .apache .struts .upload .FormFile ;
public class FileUploadAction extends Action {
private static String UPLOAD_FILE_PATH = "c:/income/" ;
@Override
public ActionForward execute (ActionMapping mapping , ActionForm form ,
HttpServletRequest request , HttpServletResponse response ) throws Exception {
FileUploadForm uploadForm = (FileUploadForm )form ;
//得到上传的文件
FormFile uploadFile = uploadForm .getUploadFile ( ) ;
//得到文件名
String fileName = uploadFile .getFileName ( ) ;
//得到文件大小
int fileSize = uploadFile .getFileSize ( ) ;
System .out .println ( "FileName = " + fileName ) ;
System .out .println ( "FileSize=" + fileSize ) ;
boolean result = true ;
try {
//得到文件的输入流
InputStream is = uploadFile .getInputStream ( ) ;
//上传文件
uploadFile (fileName ,is ) ;
} catch (IOException ex ) {
ex .printStackTrace ( ) ;
//假如上传文件失败，设置一个失败的标记位
result = false ;
}
if (result ) {
return mapping .findForward ( "success" ) ;
} else {
return mapping .findForward ( "fail" ) ;
}
}
private void uploadFile (String fileName ,InputStream is ) throws IOException {
OutputStream os = new FileOutputStream (UPLOAD_FILE_PATH + fileName ) ;
//8k缓存数据
byte [ ] buffer = new byte [1024 * 8 ] ;
//设置读进缓存的字节数
int len ;
while ( (len =is .read (buffer ) ) ! = -1 ) {
//将缓存数据写入磁盘
os .write (buffer ,0 ,len ) ;
}
//关闭输出流
os .close ( ) ;
//关闭输入流
is .close ( ) ;
}
}
import java .io .FileOutputStream ;
import java .io .IOException ;
import java .io .InputStream ;
import java .io .OutputStream ;
import javax .servlet .http .HttpServletRequest ;
import javax .servlet .http .HttpServletResponse ;
import org .apache .struts .action .Action ;
import org .apache .struts .action .ActionForm ;
import org .apache .struts .action .ActionForward ;
import org .apache .struts .action .ActionMapping ;
import org .apache .struts .upload .FormFile ;
public class FileUploadAction extends Action {
private static String UPLOAD_FILE_PATH = "c:/income/" ;
@Override
public ActionForward execute (ActionMapping mapping , ActionForm form ,
HttpServletRequest request , HttpServletResponse response ) throws Exception {
FileUploadForm uploadForm = (FileUploadForm )form ;
//得到上传的文件
FormFile uploadFile = uploadForm .getUploadFile ( ) ;
//得到文件名
String fileName = uploadFile .getFileName ( ) ;
//得到文件大小
int fileSize = uploadFile .getFileSize ( ) ;
System .out .println ( "FileName = " + fileName ) ;
System .out .println ( "FileSize=" + fileSize ) ;
boolean result = true ;
try {
//得到文件的输入流
InputStream is = uploadFile .getInputStream ( ) ;
//上传文件
uploadFile (fileName ,is ) ;
} catch (IOException ex ) {
ex .printStackTrace ( ) ;
//假如上传文件失败，设置一个失败的标记位
result = false ;
}
if (result ) {
return mapping .findForward ( "success" ) ;
} else {
return mapping .findForward ( "fail" ) ;
}
}
private void uploadFile (String fileName ,InputStream is ) throws IOException {
OutputStream os = new FileOutputStream (UPLOAD_FILE_PATH + fileName ) ;
//8k缓存数据
byte [ ] buffer = new byte [1024 * 8 ] ;
//设置读进缓存的字节数
int len ;
while ( (len =is .read (buffer ) ) ! = -1 ) {
//将缓存数据写入磁盘
os .write (buffer ,0 ,len ) ;
}
//关闭输出流
os .close ( ) ;
//关闭输入流
is .close ( ) ;
}
}
第三步，编写文件上传的jsp文件
程序代码
<%@ page language
=
"java" contentType
=
"text/html; charset=GBK"%
>
<%@ taglib uri = "http://struts.apache.org/tags-html" prefix = "html" % >
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" >
<html >
<head >
<title >文件上传表单 < /title >
<meta http-equiv = "pragma" content = "no-cache" >
<meta http-equiv = "cache-control" content = "no-cache" >
<meta http-equiv = "expires" content = "0" >
<meta http-equiv = "keywords" content = "keyword1,keyword2,keyword3" >
<meta http-equiv = "description" content = "This is my page" >
< /head >
<body >
<html:form action = "/upload" enctype = "multipart/form-data" >
上传文件： <html:file property = "uploadFile" > < /html:file >
<html:submit value = "上传文件" > < /html:submit >
< /html:form >
< /body >
< /html >
<%@ taglib uri = "http://struts.apache.org/tags-html" prefix = "html" % >
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" >
<html >
<head >
<title >文件上传表单 < /title >
<meta http-equiv = "pragma" content = "no-cache" >
<meta http-equiv = "cache-control" content = "no-cache" >
<meta http-equiv = "expires" content = "0" >
<meta http-equiv = "keywords" content = "keyword1,keyword2,keyword3" >
<meta http-equiv = "description" content = "This is my page" >
< /head >
<body >
<html:form action = "/upload" enctype = "multipart/form-data" >
上传文件： <html:file property = "uploadFile" > < /html:file >
<html:submit value = "上传文件" > < /html:submit >
< /html:form >
< /body >
< /html >
第四步，配置struts-config.xml文件
程序代码
<
?xml version
=
"1.0" encoding
=
"UTF-8"
?
>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd" >
<struts-config >
<data-sources / >
<form-beans >
<form-bean name = "fileUploadForm" type = "zizz.struts.FileUploadForm" > < /form-bean >
< /form-beans >
<global-exceptions / >
<global-forwards / >
<action-mappings >
<action path = "/upload" name = "fileUploadForm" scope = "request" type = "zizz.struts.FileUploadAction" >
<forward name = "success" path = "/success.jsp" redirect = "true" > < /forward >
<forward name = "fail" path = "/fail.jsp" redirect = "true" > < /forward >
< /action >
< /action-mappings >
<message-resources parameter = "zizz.struts.ApplicationResources" / >
< /struts-config >
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd" >
<struts-config >
<data-sources / >
<form-beans >
<form-bean name = "fileUploadForm" type = "zizz.struts.FileUploadForm" > < /form-bean >
< /form-beans >
<global-exceptions / >
<global-forwards / >
<action-mappings >
<action path = "/upload" name = "fileUploadForm" scope = "request" type = "zizz.struts.FileUploadAction" >
<forward name = "success" path = "/success.jsp" redirect = "true" > < /forward >
<forward name = "fail" path = "/fail.jsp" redirect = "true" > < /forward >
< /action >
< /action-mappings >
<message-resources parameter = "zizz.struts.ApplicationResources" / >
< /struts-config >
第五步，发布应用系统，检查测试结果