图片上传最终版本

最新推荐文章于 2023-01-17 18:20:13 发布
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最新推荐文章于 2023-01-17 18:20:13 发布
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文章标签： Servlet EXT JSP Apache Web
SERVLET

packagecom.bjsxt.shopping.servlet;

importjava.io.File;

importjava.io.IOException;

importjava.io.PrintWriter;

importjava.util.Iterator;

importjava.util.List;

importjavax.servlet.ServletConfig;

importjavax.servlet.ServletException;

importjavax.servlet.http.HttpServlet;

importjavax.servlet.http.HttpServletRequest;

importjavax.servlet.http.HttpServletResponse;

importorg.apache.commons.fileupload.FileItem;

importorg.apache.commons.fileupload.FileUploadException;

importorg.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException;

importorg.apache.commons.fileupload.disk.DiskFileItemFactory;

importorg.apache.commons.fileupload.servlet.ServletFileUpload;

publicclassFileUploadServletextendsHttpServlet
{

//定义成员变量来记录上传的路径

privateStringupLoadPath="";

@Override

//重写init(ServletConfigconfig)方法（不是voidinit()）来取得WEB.XML的值

publicvoidinit(ServletConfigconfig)throwsServletException
{

this.upLoadPath=config.getInitParameter("upload");
}

privatestaticfinallongserialVersionUID=1L;

publicFileUploadServlet()
{

super();
}

protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException
{

this.doPost(request,response);
}

protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException
{

request.setCharacterEncoding("utf-8");

intid=-1;

finallongMAX_SIZE=300*1024*1024;//设置上传文件最大值

//允许上传的文件格式的列表

finalString[]allowedExt=newString[]{"jpg","jpeg","gif","txt","doc","mp3","wma","m4a","rar","zip"};

response.setContentType("text/html");

//设置字符编码为UTF-8,统一编码，处理出现乱码问题

response.setCharacterEncoding("UTF-8");

//实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload

DiskFileItemFactorydfif=newDiskFileItemFactory();

dfif.setSizeThreshold(4096);//设置上传文件时用于临时存放文件的内存大小,这里是4K.多于的部分将临时存在硬盘

dfif.setRepository(newFile(request.getRealPath("/")+"ImagesUploadTemp"));//设置存放临时文件的目录,web根目录下的ImagesUploadTemp目录

//用以上工厂实例化上传组件

ServletFileUploadsfu=newServletFileUpload(dfif);

//设置最大上传大小
sfu.setSizeMax(MAX_SIZE);
PrintWriterout=response.getWriter();

//从request得到所有上传域的列表

ListfileList=null;

try
{
fileList=sfu.parseRequest(request);

}catch(FileUploadExceptione)

{//处理文件尺寸过大异常

if(einstanceofSizeLimitExceededException)
{

out.println("文件尺寸超过规定大小:"+MAX_SIZE+"字节<p/>");

out.println("<ahref=\"./admin/manager/productlist.jsp\">返回</a>");

return;
}
e.printStackTrace();
}

//没有文件上传

if(fileList==null||fileList.size()==0)
{

out.println("请选择上传文件<p/>");

out.println("<ahref=\"./admin/manager/productlist.jsp\">返回</a>");

return;
}

//得到所有上传的文件
IteratorfileItr=fileList.iterator();

//循环处理所有文件

while(fileItr.hasNext())
{

FileItemfileItem=null;

Stringpath=null;

longsize=0;

//得到当前文件
fileItem=(FileItem)fileItr.next();

//忽略简单form字段而不是上传域的文件域(<inputtype="text"/>等)

if(fileItem!=null&&fileItem.isFormField())
{

if(fileItem.getFieldName().equals("id"))
{
id=Integer.parseInt(fileItem.getString());
}
}

if(fileItem!=null&&!fileItem.isFormField())
{

//得到文件的完整路径
path=fileItem.getName();

//得到文件的大小
size=fileItem.getSize();

if("".equals(path)||size==0)
{

out.println("请选择上传文件<p/>");

out.println("<ahref=\"./admin/manager/productlist.jsp\">返回</a>");

return;
}

//得到去除路径的文件名

Stringt_name=path.substring(path.lastIndexOf("\\")+1);

//得到文件的扩展名(无扩展名时将得到全名)

Stringt_ext=t_name.substring(t_name.lastIndexOf(".")+1);

//拒绝接受规定文件格式之外的文件类型

intallowFlag=0;

intallowedExtCount=allowedExt.length;

for(;allowFlag<allowedExtCount;allowFlag++)
{

if(allowedExt[allowFlag].equals(t_ext))

break;
}

if(allowFlag==allowedExtCount)
{

out.println("请上传以下类型的文件<p/>");

for(allowFlag=0;allowFlag<allowedExtCount;allowFlag++)

out.println("*."+allowedExt[allowFlag]+"");

out.println("<p/><ahref=\"./admin/manager/productlist.jsp\">返回</a>");

return;
}

//longnow=System.currentTimeMillis();

//根据系统时间生成上传后保存的文件名

//Stringprefix=String.valueOf(now);

//保存的最终文件完整路径,保存在web根目录下的ImagesUploaded目录下

//Stringu_name=request.getRealPath("/")+"ImagesUploaded/"

//+prefix+"."+t_ext;

//Stringfilename=t_name;

//System.out.println(t_name);

try
{

//保存文件到C:\\upload目录下

//统一将文件的扩展名改为　jpg　方便在页面中显示

fileItem.write(newFile(upLoadPath+id+"."+"jpg"));

//System.out.println(filename);

out.println("文件上传成功.已保存到:"+upLoadPath+id+"."+"jpg"+"文件大小:"+size+"字节<p/>");

out.println("<ahref=\"./admin/manager/productlist.jsp\">继续上传</a>");

}catch(Exceptione)
{
e.printStackTrace();
}
}
}
}
}
WEB.XML中写入下面的内容：
<servlet>
<description>ThisisthedescriptionofmyJ2EEcomponent</description>
<display-name>ThisisthedisplaynameofmyJ2EEcomponent</display-name>
<servlet-name>FileUploadServlet</servlet-name>

<servlet-class>com.bjsxt.shopping.servlet.FileUploadServlet</servlet-class>
<init-param>
<param-name>upload</param-name>
<param-value>E:\\workspace\\MyProjest\\Shopping\\WebRoot\\images\\product\\</param-value>
</init-param>
</servlet>
其实最好的方法是增加一下属性文件，把要上传的路径写到该文件中，要上传时再从中读取这个路径