javaWeb 文件上传功能

首先要下载两个jar包，点击我的网盘地址即可下载

http://pan.baidu.com/s/1o7C5iP0

比较重点的几个类：FileItem,servletFileUpload,
FileItemFactory
 
  
 
  
下面是具体代码
 
  
不但可以传文本，还可以传各种其他的文件
 
  
package com.xyp.servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.List;

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 org.apache.commons.fileupload.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

/**
 * Servlet implementation class UploadServlet
 */
@WebServlet(value="/UploadServlet")
public class UploadServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public UploadServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setCharacterEncoding("UTF-8");//设置编码
		response.getWriter().println("请以post方式上传文件");//输出信息
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	@SuppressWarnings("unchecked") //消除unchecked warning
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setCharacterEncoding("UTF-8");//设置response编码
		response.setContentType("text/html");//设置response输出类型
		File file1 = null,file2 = null;
		String description1 = null,description2 = null;
		PrintWriter out = response.getWriter();
		FileItemFactory factory = new DiskFileItemFactory();
 
  
		//建立FileItem工厂，可以设置缓存在内存或者缓存在硬盘
		ServletFileUpload servletFileUpload = new ServletFileUpload(factory);
 
  
		//设置servletFileUpload使用刚才建立的FileItem工厂
		try {
			List list=servletFileUpload.parseRequest(request);//将结果放置在List中，解析request
			out.println("遍历所有的FileItem...
");
			for(FileItem fileItem:list){	//遍历所有的FileItem
 
  
				//打出所有上传的标签的name属性值
				System.out.println(fileItem.getFieldName());
				//获取所有fileitem是文件的文件名
				String str = new String(fileItem.getName());
				if(fileItem.isFormField()){	//如果是文本域
					if("description1".equals(fileItem.getFieldName())){//如果是该参数
						out.println("遍历到 description1...
");
						description1 = new String(fileItem.getString().getBytes(),"UTF-8");
					}
					if("description2".equals(fileItem.getFieldName())){//如果是该参数
						out.println("遍历到 description2...
");
						description2 = new String(fileItem.getString().getBytes(),"UTF-8");
					}
				}else{	//否则为文件域
					if("file1".equals(fileItem.getFieldName())&&!"".equals(str)){//如果name=file1,并且文件名不为空字符串
					File remoteFile= new File(new String(fileItem.getName().getBytes(),"UTF-8"));
					out.println("遍历到file1...
");
					out.println("客户端文件位置："+remoteFile.getAbsolutePath()+"
");
					//服务端文件，放在upload文件夹下
					file1 = new File(this.getServletContext().getRealPath("attachment"),remoteFile.getName());//创建file实例
					file1.getParentFile().mkdirs();//创建文件夹路径
					file1.createNewFile();//创建新文件
					InputStream ins = fileItem.getInputStream();//FileItem的内容
					OutputStream ous = new FileOutputStream(file1);//输出到文件中
								try {
									byte[] buffer = new byte[1024];//字节缓存
									int len = 0;//实际缓存长度
									while((len=ins.read(buffer))>-1){//循环读入缓存
										ous.write(buffer,0,len);
										//ous.write(buffer);
										out.println("已保存文件"+file1.getAbsolutePath()+"
");
									}
								}finally{
									ous.close();
									ins.close();
								}
							}
					if("file2".equals(fileItem.getFieldName())&&!"".equals(str)){//如果name=file2,并且文件名不为空字符串
						File remoteFile= new File(new String(fileItem.getName().getBytes(),"UTF-8"));
						out.println("遍历到file2...
");
						out.println("客户端文件位置："+remoteFile.getAbsolutePath()+"
");
						//服务端文件，放在upload文件夹下
						file2 = new File(this.getServletContext().getRealPath("attachment"),remoteFile.getName());//创建file实例
						file2.getParentFile().mkdirs();//创建文件夹路径
						file2.createNewFile();//创建新文件
						InputStream ins = fileItem.getInputStream();//FileItem的内容
						OutputStream ous = new FileOutputStream(file2);//输出到文件中
								try {
									byte[] buffer = new byte[1024];//字节缓存
									int len = 0;//实际缓存长度
									while((len=ins.read(buffer))>-1){//循环读入缓存
										ous.write(buffer,0,len);
										out.println("已保存文件"+file1.getAbsolutePath()+"
");
									}
								}finally{
									ous.close();
									ins.close();
								}
						}
				
					}
		} 
			out.println("Request解析完毕");
		}catch (Exception e) {
			e.printStackTrace();
		}
		if(file1 !=null){//输出file1链接
			out.println("
");
			out.println("
file1:
");
			out.println("
");
			out.println(""+file1.getName()+"");
			out.println("
");
			out.println("
");
		}
		if(file2 !=null){//输出file2链接
			out.println("
");
			out.println("
file2:
");
			out.println("
");
			out.println(""+file2.getName()+"");
			out.println("
");
			out.println("
");
		}
		out.println("
");
		out.println("
description1:
");
		out.println("
");
		out.println(description1);
		out.println("
");
		out.println("
description2:
");
		out.println("
");
		out.println(description2);
		out.println("
");
		out.println("
");
	}

}
 
  
 前端代码： 
  
 
  







	

		


			

				
上传文件
				

					
上传文件一
					

						
					
				
				

					
上传文件二
					

						
					
				
				

					
上传文件说明一
					

						
					
				
				

					
上传文件说明二