使用servlet保存用户上传的文件到本地

原文地址：http://blog.csdn.net/shuwei003/article/details/6742332

upload.jsp

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<%@page contentType="text/html;charset=utf-8" %>
<head>
<title>fbysss UploadBean 示例</title>


</head>
<FORM name="form1" METHOD="POST" ACTION="adddata" ENCTYPE="multipart/form-data">
附件
<input name="attach" type="FILE" id="attach" size="50" />
<input name="ok" type= "submit" value="提交">
</form>

web.xml

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<servlet>
        <servlet-name>AddDataServlet</servlet-name>
        <servlet-class>com.upload.action.AddDataServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>AddDataServlet</servlet-name>
        <url-pattern>/adddata</url-pattern>
    </servlet-mapping>

AddDataServlet.java

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package com.upload.action;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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;

public class AddDataServlet extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String tempDirectory = "d:/temp/";    //要在最后加上斜杠:temp/，缓存文件目录
        try {
            int sizeThreshold = 1024 * 64; //写满该大小的缓存后，存入硬盘中。
            File repositoryFile = new File(tempDirectory);
            FileItemFactory factory = new DiskFileItemFactory(sizeThreshold, repositoryFile);
            ServletFileUpload upload = new ServletFileUpload(factory);
            upload.setHeaderEncoding("utf-8"); //设置字符编码
            upload.setSizeMax(50 * 1024 * 1024); // set every upload file'size less than 50M
            List items = upload.parseRequest(request);   //这里开始执行上传
            Iterator iter = items.iterator();

            while (iter.hasNext()) {
                FileItem item = (FileItem) iter.next();   //FileItem就是表示一个表单域。

                if(item.isFormField()){ //isFormField方法用于判断FileItem是否代表一个普通表单域(即非file表单域)
                    System.out.println("***"+item.getFieldName());
                }else {
                    //String fieldName = item.getFieldName(); //获取表单域name属性的值
                    //String fileName = item.getName();     //返回该文件在客户机上的文件名。e.g: e:\dianying\\video\1.wmv
                    //System.out.println("*****"+fieldName);
                    //System.out.println("*****"+fileName);
                    String path = item.getName();
                    String fileName = path.substring(path.lastIndexOf("\\"));
                    File uploadedFile = new File("d:/video/" + fileName);
                    item.write(uploadedFile);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

使用servlet保存用户上传的文件到本地

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