使用common-fileupload实现文件的上传
文件上传是网站非常常用的功能，直接使用Servlet获取上传文件还得解析请求参数，比较麻烦，所以一般选择采用
apache的开源工具，common-fileupload.这个jar包可以再apache官网上面找到，也可以在struts的lib文件夹下面找到，
struts上传的功能就是基于这个实现的。
common-fileupload是依赖于common-io这个包的，所以还需要下载这个包。然后导入到你的项目路径下面。
使用代码如下
[java]
package oop.hg.ytu.servlet;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import oop.hu.ytu.dao.UploadDomain;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class Upload extends HttpServlet {
/**
* 处理用户上传请求
*/
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// String describe = request.getParameter("describe");
DiskFileItemFactory factory = new DiskFileItemFactory();
@SuppressWarnings("deprecation")
String path = request.getRealPath("/upload");//设置磁盘缓冲路径
factory.setRepository(new File(path));
factory.setSizeThreshold(1024*1024);//设置创建缓冲大小
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setSizeMax(-1);//设置上传文件限制大小,-1无上限
try {
@SuppressWarnings("unchecked")
List<FileItem> list = upload.parseRequest(request);
String va = null;
for(FileItem item : list){
// String name = item.getFieldName();
if(item.isFormField()){//判断是否是文件流
va = item.getString("UTF-8");
// System.out.println(name+"="+va);
/// request.setAttribute(name, value);
}else{
String value = item.getName();//会将完整路径名传过来
int start = value.lastIndexOf("\\");
String fileName = value.substring(start+1);
// request.setAttribute(name, fileName);
InputStream in = item.getInputStream();
UploadDomain dao = new UploadDomain();
//item.write(new File(realPath,fileName));
int index = fileName.lastIndexOf(".");
String realFileName = fileName.substring(0,index);
String type = fileName.substring(index+1);
dao.insert(in, realFileName,type,va);//放入到数据库中
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
package oop.hg.ytu.servlet;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import oop.hu.ytu.dao.UploadDomain;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class Upload extends HttpServlet {
/**
* 处理用户上传请求
*/
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
th
补充：综合编程 , 其他综合 ,
