图片上传技术.doc

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1、apachecommons-fileupload是一个很好的文件上传工具，最近使用commons-fileupload实现了图片的上传及显示，可将图片保存在指定的文件夹中，也可以将图片存放在数据库,并支持四种常用的图片格式:jpg,png,gif,bmp。首先，跟上传一般文件一样，需要写-•个servlet來处理上传的文件，你可以修改保存路径或选择将图片保存在数据库中，只需耍做简单的修改就行了，servlet代码如下：FileUploadServlet.javajava代码1.2.4.5.6.7.8.9.10.packagecom.ek.

2、servlet;importimportimportimportimportimportimportimportimport11.importimportimportimportimportimportimportimportimportpublic/**12.13.14.15.16.17.18.19.20.java•awt•image•Bufferedlmage;java•io•ByteArrayOutputstrearn;java.io.File;java•io•IOException;java•io•InputStrearn;jav

3、a•util•Iterator;java•util•List;java•util•regex•Matcher;java•util•regex•Pattern;javaXeServlet•ServletException;javax.servlet・http.HttpServlet;javax.servlet.http.HttpServletRequest;javax.servlet•http.HttpServletResponse;org.apache.commons.fileupload.Fileitem;org.apache.comm

4、ons.fileupload.FileUploadException;org>apache.commons.fileupload.disk•DiskFileltemFactory;org.apache.commons.fileupload.servlet.ServletFileUpload;com.ek.image.Imagelltil;classFileUploadServletextendsHttpServlet{21.22.23.24.25.26.*/privatestaticprivatestatic/**finallongser

5、ialVersionUID=IL;StringfilePath=,,H;27.*Destructionoftheservlet.28.*/29.publicvoiddestroy(){30.super.destroy();//Justputs"destroy1'stringinlog31.//Putyourcodehere32・}33・/**34.*ThedoPostmethodoftheservlet.35・36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.52.53.54.55.56.57

6、.58.59.60.61.62.63.64.65.66.67.68.69.70.71.72.73.74.75.76.77.78.*Thismethodiscalledwhenaformhasitstagvaluemethodequalsto*post.**@paramrequest*therequestsendbythedienttotheserver*@paramresponse*theresponsesendbytheservertothedient*@throwsServletException*ifanerroroccurred*

7、@throwsIOException*ifanerroroccurred*/publicvoiddoPost(HttpServletRequestreq^HttpServletResponseres)throwsServletException,IOException{res.setContentType(Htext/html;charset=UTF-8");DiskFileltemFactoryfactory=newDiskFileltemFactory();//maximumsizethatwillbestoredinmemoryfa

8、ctory.setSizeThreshold(4096);//thelocationforsavingdatathatislargerthangetSizeThreshold()factory