java文件上传功能

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java文件上传功能
//jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">    <title>My JSP 'index.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="This is my page">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->  </head>  <body>    <form action="${pageContext.request.contextPath }/Upload3" method="post" enctype="multipart/form-data">        用户名；<input type="text" name="username"/><br/>        照　片：<input type="file" name="zhaoPian"/><br/>        <input type="submit" value="上传"/>      </form>    </body></html>

//servlet

package com.kero99.ygc.test;  import java.io.File;import java.io.IOException;import java.util.List;import java.util.UUID;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.FileUploadException;      import org.apache.commons.fileupload.disk.DiskFileItemFactory;  import org.apache.commons.fileupload.servlet.ServletFileUpload;  import org.apache.commons.io.FilenameUtils;    public class Upload3 extends HttpServlet {               public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {                     //设置编码响应到浏览器的格式             response.setCharacterEncoding("UTF-8");             response.setContentType("text/html;charset=UTF-8");             //设置存的路径  存的文件需要在tomcat项目右键 Browse里找到/WEB-INF/files              String savepath=getServletContext().getRealPath("/WEB-INF/files");              //创建磁盘文件工厂 需要导入上传文件jar包 由工厂接受 解析器处理文件            DiskFileItemFactory diskFileItemFactory=new DiskFileItemFactory();            //创建文件解析器            ServletFileUpload fileUpload=new ServletFileUpload(diskFileItemFactory);            try {                //设置上传文件的编码格式                fileUpload.setHeaderEncoding("UTF-8");                //接受请求 文件解析器解析请求 返回List<FileItem>接口                 List<FileItem> list=fileUpload.parseRequest(request);                //迭代 FileItem接口处理文件            for(FileItem item:list){                //如果fileitem中封装的是普通输入项的数据                if(item.isFormField()){                    //获取文本内容 eg: <input type="text" name="username"/> getFieldName为文本项内容=username                    String name=item.getFieldName();                    //获取文本内容 eg:<input type="text" name="username"/> getString=输出的文本                    String value=item.getString("UTF-8");                     //文本内容设置字符集为utf-8                    String value1=new String(name.getBytes("iso8859-1"),"UTF-8");                }else{//else 为上传的是文件                    //获取上传文件的名字                    String filename1=item.getName();                    String filename=UUID.randomUUID().toString().replace("-","")+filename1;                     int hCode = filename.hashCode();                          String hex = Integer.toHexString(hCode);                          File file = new File(savepath,hex.charAt(0)+"/"+hex.charAt(1));                      if(!file.exists() && !file.isDirectory() &&!filename1.equals("") && filename1!=null && !filename1.trim().equals("")){                         file.mkdirs();                                           String extension = FilenameUtils.getExtension(filename);                            if(!("jsp".equals(extension)||"txt".equals(extension))){                                File file1=new File(file,filename);                                item.write(file1);                                response.getWriter().print("success!");                            }else{                                response.getWriter().print("文件不能为jsp和exe类型,请从新上传...");                            }                     }else{                         response.getWriter().print("不能是空文件");                     }                        }               }            } catch (Exception e) {                e.printStackTrace();            }        }      }

//文件上传重构版

package com.kero99.ygc.test;import java.io.File;import java.io.IOException;import java.util.List;import java.util.UUID;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.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.apache.commons.io.FilenameUtils;import com.sun.corba.se.spi.legacy.connection.GetEndPointInfoAgainException;public class Upload extends HttpServlet{    @Override    protected void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {            doPost(request, response);    }    @Override    protected void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        //设置响应浏览器格式        response.setCharacterEncoding("utf-8");        response.setContentType("text/html;charset=utf-8");        String savapath=getServletContext().getRealPath("/WEB-INF/files");        DiskFileItemFactory diskFileItemFactory=new DiskFileItemFactory();        ServletFileUpload fileUpload=new ServletFileUpload(diskFileItemFactory);        try {            fileUpload.setHeaderEncoding("utf-8");            List<FileItem> list=fileUpload.parseRequest(request);            for(FileItem item:list){                if(item.isFormField()){                    String name=item.getFieldName();//获取文本项                    String value=item.getString("utf-8");//获取文本内容                     String value1=new String(name.getBytes("iso8859-1"),"UTF-8");                }else{//为上传的是文件                             String filename1=item.getName();                    String filename=UUID.randomUUID().toString().replace("-","")+filename1;                    //目录打散方法 a/b                    String path=getFileChildPath(filename);                             File file=new File(savapath,path);                    if(!file.exists() && !file.isDirectory()){                        file.mkdirs();                              String extension=FilenameUtils.getExtension(filename);                        if(!("jsp".equals(extension)||"txt".equals(extension))){                            File file1=new File(file,filename);                            item.write(file1);                            response.getWriter().print("success");                        }else{                            response.getWriter().print("文件不能为jsp和exe类型");                        }                    }else{                        response.getWriter().print("文件不能是空的");                    }                }            }        } catch (Exception e) {            e.printStackTrace();        }    }    //目录打散    public String getFileChildPath(String filename){        int hCode=filename.hashCode();        String hex=Integer.toHexString(hCode);        String path=hex.charAt(0)+"/"+hex.charAt(1);        return path;    }    @Override    public void destroy() {        // TODO Auto-generated method stub        super.destroy();    }    @Override    public void init() throws ServletException {        // TODO Auto-generated method stub        super.init();    }}

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