cos是o'rrilly公司開發的一款用于http上傳文件的opensource組件
需要cos.jar,下載地址：http://www.servlets.com/cos/
cos上傳文件很簡單，比fileupload還簡單：但是上傳最大我試了試，是800多兆，超過直接崩潰：
java.io.ioexception: posted content length of 1627105576 exceeds limit of 889192448 --->byte，800多m
只需一個servelt即可：
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package com.lhy.upload;import java.io.file;import java.io.fileoutputstream;import java.io.ioexception;import java.io.outputstream;import java.io.printwriter;import java.util.enumeration;import java.util.uuid;import javax.servlet.servletexception;import javax.servlet.annotation.webservlet;import javax.servlet.http.httpservlet;import javax.servlet.http.httpservletrequest;import javax.servlet.http.httpservletresponse;import com.oreilly.servlet.multipartrequest;import com.oreilly.servlet.multipart.filerenamepolicy;/** * cosservlet * 在cos中就一個類， * multipartrequest它是request的包裝類。 */@webservlet(name="cosservlet",urlpatterns="/cosservlet")public class cosservlet extends httpservlet{ @override protected void dopost(httpservletrequest req, httpservletresponse resp) throws servletexception, ioexception { //第一步，聲明文件的保存目錄 string path = getservletcontext().getrealpath("/up"); //第二步：文件上傳 //聲明文件重新命名策略,默認的不行不能重命名，自己實現filerenamepolicy接口// filerenamepolicy rename = new defaultfilerenamepolicy(); multipartrequest multireq = new multipartrequest(req, path, 1024*1024*100, "utf-8",new myrename()); //輸出所上傳的文件的信息 enumeration filenames = multireq.getfilenames(); while(filenames.hasmoreelements()){ string name = (string)filenames.nextelement(); file file = multireq.getfile(name);//得到上傳的文件 if(null != file){ string filename = multireq.getfilesystemname(name); //取得文件名 string contenttype = multireq.getcontenttype(name);//類型 system.out.println("上傳的文件: " +filename+"， 文件類型: "+contenttype); } } //輸出所提交的表單中其它文本輸入域的值 enumeration formvalue = multireq.getparameternames(); while(formvalue.hasmoreelements()){ string param = (string)formvalue.nextelement(); string value = multireq.getparameter(param); system.out.println(value); } //第三步：如果知道input的name，還可以直接獲取信息， /*resp.setcontenttype("text/html;charset=utf-8"); printwriter out = resp.getwriter(); out.print("文件名稱1:"+multireq.getoriginalfilename("img1")); out.print("<br/>新名稱:"+multireq.getfilesystemname("img1")); out.print("<br/>類型1:"+multireq.getcontenttype("img1")); out.print("<br/>大小1："+multireq.getfile("img1").length()); out.print("<br/>說明:"+multireq.getparameter("desc1")); if(multireq.getcontenttype("img1").contains("image/")){ out.print("<img width='300px' height='200px' src='"+req.getcontextpath()+"/up/"+multireq.getfilesystemname("img1")+"'></img>"); } out.print("<hr/>"); out.print("文件名稱2:"+multireq.getoriginalfilename("img2")); out.print("<br/>類型2:"+multireq.getcontenttype("img2")); out.print("<br/>大小2："+multireq.getfile("img2").length()); out.print("<br/>說明2:"+multireq.getparameter("desc2"));// out.print("<hr/>"); out.print("文件名稱3:"+multireq.getoriginalfilename("img3")); out.print("<br/>類型3:"+multireq.getcontenttype("img3")); out.print("<br/>大小3："+multireq.getfile("img3").length()); out.print("<br/>說明3:"+multireq.getparameter("desc3"));*/ }}/** * 重命名策略， */class myrename implements filerenamepolicy{ @override public file rename(file file) { string filename = file.getname(); string extname = filename.substring(filename.lastindexof(".")); string uuid = uuid.randomuuid().tostring().replace("-",""); string newname = uuid+extname;//abc.jpg file = new file(file.getparent(),newname); return file; }} |
表單：
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<form action="<c:url value='/cosservlet'/>" method="post" enctype="multipart/form-data"> file1：<input type="file" name="img1"><br /> 說明1： <input type="text" name="desc1"><br /> file2：<input type="file" name="img2"><br/> 說明2：<input type="text" name="desc2"><br/> file3：<input type="file" name="img3"><br/> 說明3：<input type="text" name="desc3"><br/> <input type="submit" /> </form> |
啟動上傳：
服務端：
總結
以上所述是小編給大家介紹的java中使用cos實現文件上傳功能，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對服務器之家網站的支持！
原文鏈接：http://www.cnblogs.com/lihaoyang/archive/2017/08/11/7346495.html
