Java中使用COS实现文件上传功能

cos是o'rrilly公司开发的一款用于http上传文件的opensource组件

需要cos.jar,下载地址：http://www.servlets.com/cos/

cos上传文件很简单，比fileupload还简单：但是上传最大我试了试，是800多兆，超过直接崩溃：

java.io.ioexception: posted content length of 1627105576 exceeds limit of 889192448 —>byte，800多m

只需一个servelt即可：

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中就一个类，

* multipartrequest它是request的包装类。

*/

@webservlet(name="cosservlet",urlpatterns="/cosservlet")

public class cosservlet extends httpservlet{

@override

protected void dopost(httpservletrequest req, httpservletresponse resp) throws servletexception, ioexception {

//第一步，声明文件的保存目录

string path = getservletcontext().getrealpath("/up");

//第二步：文件上传

//声明文件重新命名策略,默认的不行不能重命名，自己实现filerenamepolicy接口

// filerenamepolicy rename = new defaultfilerenamepolicy();

multipartrequest multireq = new multipartrequest(req, path, 1024*1024*100, "utf-8",new myrename());

//输出所上传的文件的信息

enumeration filenames = multireq.getfilenames();

while(filenames.hasmoreelements()){

string name = (string)filenames.nextelement();

file file = multireq.getfile(name);//得到上传的文件

if(null != file){

string filename = multireq.getfilesystemname(name); //取得文件名

string contenttype = multireq.getcontenttype(name);//类型

system.out.println("上传的文件: " +filename+"，文件类型: "+contenttype);

}

//输出所提交的表单中其它文本输入域的值

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，还可以直接获取信息，

/*resp.setcontenttype("text/html;charset=utf-8");

printwriter out = resp.getwriter();

out.print("文件名称1:"+multireq.getoriginalfilename("img1"));

out.print(" 新名称:"+multireq.getfilesystemname("img1"));

out.print(" 类型1:"+multireq.getcontenttype("img1"));

out.print(" 大小1："+multireq.getfile("img1").length());

out.print(" 说明:"+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("文件名称2:"+multireq.getoriginalfilename("img2"));

out.print(" 类型2:"+multireq.getcontenttype("img2"));

out.print(" 大小2："+multireq.getfile("img2").length());

out.print(" 说明2:"+multireq.getparameter("desc2"));

//

out.print("<hr/>");

out.print("文件名称3:"+multireq.getoriginalfilename("img3"));

out.print(" 类型3:"+multireq.getcontenttype("img3"));

out.print(" 大小3："+multireq.getfile("img3").length());

out.print(" 说明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;

}

表单：

Java中使用COS实现文件上传功能

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