【servlet】文件上传
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- 实现web开发中的文件上传功能,需完成如下二步操作:
- 在web页面中添加上传输入项
- 在servlet中读取上传文件的数据,并保存到本地硬盘中。
- 如何在web页面中添加上传输入项?
- <input type=“file”>标签用于在web页面中添加文件上传输入项,设置文件上传输入项时须注意:
- 必须要设置input输入项的name属性,否则浏览器将不会发送上传文件的数据。
- 必须把form的enctype属值设为multipart/form-data.设置该值后,浏览器在上传文件时,将把文件数据附带在http请求消息体中,并使用MIME协议对上传的文件进行描述,以方便接收方对上传数据进行解析和处理。
- <input type=“file”>标签用于在web页面中添加文件上传输入项,设置文件上传输入项时须注意:
upload.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 'upload.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="UploadServlet" enctype="multipart/form-data" method="post">
- <input type="text" name="username"><br/>
- <input type="file" name="file1"><br/>
- <input type="file" name = "file2"><br/>
- <input type="submit" value="上传文件">
- </form>
- </body>
- </html>
![](http://img.my.csdn.net/uploads/201211/29/1354184469_1944.png)
UploadServlet.java
- <%@ 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 'upload.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="UploadServlet" enctype="multipart/form-data" method="post">
- <input type="text" name="username"><br/>
- <input type="file" name="file1"><br/>
- <input type="file" name = "file2"><br/>
- <input type="submit" value="上传文件">
- </form>
- </body>
- </html>
![](http://img.my.csdn.net/uploads/201211/29/1354185125_2974.png)
- 如何在Servlet中读取文件上传数据,并保存到本地硬盘中?
- Request对象提供了一个getInputStream方法,读取到客户端提交过来的数据。
upload.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 'upload.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="UploadServlet" enctype="multipart/form-data" method="post">
- <input type="text" name="username"><br/>
- <input type="file" name="file1"><br/>
- <input type="file" name = "file2"><br/>
- <input type="submit" value="上传文件">
- </form>
- </body>
- </html>
UploadServlet.java
- <p>
- package com.hbsi.servlet;</p>
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.PrintWriter;
- import java.util.List;
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import javax.swing.filechooser.FileNameExtensionFilter;
- import org.apache.commons.fileupload.FileItem;
- import org.apache.commons.fileupload.disk.DiskFileItemFactory;
- import org.apache.commons.fileupload.servlet.ServletFileUpload;
- public class UploadServlet extends HttpServlet {
- <span style="white-space:pre"> </span>public void doGet(HttpServletRequest request, HttpServletResponse response)
- <span style="white-space:pre"> </span>throws ServletException, IOException {
- <span style="white-space:pre"> </span>//获取元素
- <span style="white-space:pre"> </span>//不适用传统方式
- <span style="white-space:pre"> </span>System.out.println(request.getParameter("username"));
- <span style="white-space:pre"> </span>//Request对象提供了一个getInputStream方法,读取到客户端提交过来的数据
- <span style="white-space:pre"> </span>InputStream in = request.getInputStream();
- <span style="white-space:pre"> </span>byte[] buf = new byte[1024];
- <span style="white-space:pre"> </span>int len=0;
- <span style="white-space:pre"> </span>while((len=in.read(buf))>0){
- <span style="white-space:pre"> </span>System.out.println(new String(buf,0,len));
- <span style="white-space:pre"> </span>}
- <span style="white-space:pre"> </span>}
- <span style="white-space:pre"> </span>public void doPost(HttpServletRequest request, HttpServletResponse response)
- <span style="white-space:pre"> </span>throws ServletException, IOException {
- <span style="white-space:pre"> </span>doGet(request, response);
- <span style="white-space:pre"> </span>}
- }
- 但由于用户可能会同时上传多个文件,在servlet端编程直接读取上传数据,并分别解析出相应的文件数据是一项非常麻烦的工作。
- Request对象提供了一个getInputStream方法,读取到客户端提交过来的数据。
Commons-fileupload
- 为方便用户处理文件上传数据,Apache 开源组织提供了一个用来处理表单文件上传的一个开源组件( Commons-fileupload ),该组件性能优异,并且其API使用极其简单,可以让开发人员轻松实现web文件上传功能,因此在web开发中实现文件上传功能,通常使用Commons-fileupload组件实现。
- 使用Commons-fileupload组件实现文件上传,需要导入该组件相应的支撑jar包
- Commons-fileupload和commons-io
- commons-io 不属于文件上传组件的开发jar文件,但Commons-fileupload 组件从1.1 版本开始,它工作时需要commons-io包的支持。
fileupload组件工作流程
![](http://img.my.csdn.net/uploads/201211/29/1354186221_7366.png)
- 一点上传,所有请求信息封装在request封装对象里,想用fileupload组件进行上传
- 获取工厂解析器DiskFileItemFactory
- 从工厂里获取解析器,ServletFileupLoad
- 将请求传入解析器,对请求进行解析,调用parseRequest()方法
- 迭代list集合,得到每个输入项的数据
- 判断item的类型
- 代表普通字段的FileItem
- isFormField
- getFieldName
- getString
- 代表上传文件FileItem
- getInputStream
- getName
核心API—DiskFileItemFactory
- DiskFileItemFactory 是创建 FileItem 对象的工厂,这个工厂类常用方法:
- public void setSizeThreshold(int sizeThreshold) :设置内存缓冲区的大小,默认值为10K。当上传文件大于缓冲区大小时, fileupload组件将使用临时文件缓存上传文件。
- public void setRepository(java.io.File repository) :指定临时文件目录,默认值为System.getProperty("java.io.tmpdir").
- public DiskFileItemFactory(int sizeThreshold, java.io.File repository) :构造函数
核心API—ServletFileUpload
- ServletFileUpload 负责处理上传的文件数据,并将表单中每个输入项封装成一个 FileItem 对象中。常用方法有:
- boolean isMultipartContent(HttpServletRequest request) :判断上传表单是否为multipart/form-data类型
- List parseRequest(HttpServletRequest request):解析request对象,并把表单中的每一个输入项包装成一个fileItem 对象,并返回一个保存了所有FileItem的list集合。
- setFileSizeMax(long fileSizeMax) :设置上传文件的最大值
- setSizeMax(long sizeMax) :设置上传文件总量的最大值
- setHeaderEncoding(java.lang.String encoding) :设置编码格式
- setProgressListener(ProgressListener pListener)
【实例】把文件上传到本地硬盘
实现步骤1、创建DiskFileItemFactory对象,设置缓冲区大小和临时文件目录
2、使用DiskFileItemFactory 对象创建ServletFileUpload对象,并设置上传文件的大小限制。
3、调用ServletFileUpload.parseRequest方法解析request对象,得到一个保存了所有上传内容的List对象。
4、对list进行迭代,每迭代一个FileItem对象,调用其isFormField方法判断是否是上传文件
为普通表单字段,则调用getFieldName、getString方法得到字段名和字段值
为上传文件,则调用getInputStream方法得到数据输入流,从而读取上传数据。
编码实现文件上传
upload.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 'upload.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="UploadServlet" enctype="multipart/form-data" method="post">
- <input type="text" name="username"><br/>
- <input type="file" name="file1"><br/>
- <input type="file" name = "file2"><br/>
- <input type="submit" value="上传文件">
- </form>
- </body>
- </html>
UploadServlet.java
- package com.hbsi.servlet;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.PrintWriter;
- import java.util.List;
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import javax.swing.filechooser.FileNameExtensionFilter;
- import org.apache.commons.fileupload.FileItem;
- import org.apache.commons.fileupload.disk.DiskFileItemFactory;
- import org.apache.commons.fileupload.servlet.ServletFileUpload;
- public class UploadServlet extends HttpServlet {
- public void doGet(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- /*
- //获取元素
- //不适用传统方式
- System.out.println(request.getParameter("username"));
- //Request对象提供了一个getInputStream方法,读取到客户端提交过来的数据
- InputStream in = request.getInputStream();
- byte[] buf = new byte[1024];
- int len=0;
- while((len=in.read(buf))>0){
- System.out.println(new String(buf,0,len));
- }*/
- try{
- //1.创建一个解析器工厂
- DiskFileItemFactory factory = new DiskFileItemFactory();
- //2.得到一个解析器
- ServletFileUpload upload = new ServletFileUpload(factory);
- upload.setHeaderEncoding("UTF-8");
- //3.将请求传入解析器,对请求进行解析
- List<FileItem> list = upload.parseRequest(request);
- //4.迭代list集合,得到每个输入项的数据
- for(FileItem item : list){
- //5.判断item的类型
- if(item.isFormField()){
- //普通输入项
- String inputName = item.getFieldName();
- String inputValue = item.getString();
- System.out.println(inputName+"="+inputValue);
- }else{
- //上传输入项
- String fileName = item.getName(); //获取到上传文件的文件名 浏览器不一样,获取的路径不一样,例如aa.txt c:\aaa\aa.txt
- //处理浏览器取值不一样
- fileName = fileName.substring(fileName.lastIndexOf("\\")+1);
- InputStream in = item.getInputStream();
- FileOutputStream out = new FileOutputStream("d:\\"+fileName);
- byte[] buf = new byte[1024];
- int len=0;
- while((len=in.read(buf))>0){
- out.write(buf,0,len);
- }
- in.close();
- out.close();
- }
- request.setAttribute("message","上传成功");
- }
- }catch (Exception e) {
- e.printStackTrace();
- request.setAttribute("message", "上传失败");
- }
- request.getRequestDispatcher("/upload/message.jsp").forward(request, response);
- }
- public void doPost(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- doGet(request, response);
- }
- }
- <%@ 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 'message.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>
- ${message } <br>
- </body>
- </html>
![](http://img.my.csdn.net/uploads/201211/29/1354185768_2286.png)
上传图片:
中文文件乱码问题
上传文件名是中文:
upload.setHeaderEncoding("UTF-8");
- 文件名中文乱码问题,可调用ServletUpLoader的setHeaderEncoding方法,或者设置request的setCharacterEncoding属性
若用上个案例的方法上传中文文件,效果如下
修改UploadServlet.java,在得到解析器后面
- package com.hbsi.servlet;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.PrintWriter;
- import java.util.List;
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import javax.swing.filechooser.FileNameExtensionFilter;
- import org.apache.commons.fileupload.FileItem;
- import org.apache.commons.fileupload.disk.DiskFileItemFactory;
- import org.apache.commons.fileupload.servlet.ServletFileUpload;
- public class UploadServlet extends HttpServlet {
- public void doGet(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- /*
- //获取元素
- //不适用传统方式
- System.out.println(request.getParameter("username"));
- //Request对象提供了一个getInputStream方法,读取到客户端提交过来的数据
- InputStream in = request.getInputStream();
- byte[] buf = new byte[1024];
- int len=0;
- while((len=in.read(buf))>0){
- System.out.println(new String(buf,0,len));
- }*/
- try{
- //1.创建一个解析器工厂
- DiskFileItemFactory factory = new DiskFileItemFactory();
- //2.得到一个解析器
- ServletFileUpload upload = new ServletFileUpload(factory);
- //和jsp页面编码一致就好
- upload.setHeaderEncoding("UTF-8");
- //3.将请求传入解析器,对请求进行解析
- List<FileItem> list = upload.parseRequest(request);
- //4.迭代list集合,得到每个输入项的数据
- for(FileItem item : list){
- //5.判断item的类型
- if(item.isFormField()){
- //普通输入项
- String inputName = item.getFieldName();
- String inputValue = item.getString();
- System.out.println(inputName+"="+inputValue);
- }else{
- //上传输入项
- String fileName = item.getName(); //获取到上传文件的文件名 浏览器不一样,获取的路径不一样,例如aa.txt c:\aaa\aa.txt
- //处理浏览器取值不一样
- fileName = fileName.substring(fileName.lastIndexOf("\\")+1);
- InputStream in = item.getInputStream();
- FileOutputStream out = new FileOutputStream("d:\\"+fileName);
- byte[] buf = new byte[1024];
- int len=0;
- while((len=in.read(buf))>0){
- out.write(buf,0,len);
- }
- in.close();
- out.close();
- }
- request.setAttribute("message","上传成功");
- }
- }catch (Exception e) {
- e.printStackTrace();
- request.setAttribute("message", "上传失败");
- }
- request.getRequestDispatcher("/upload/message.jsp").forward(request, response);
- }
- public void doPost(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- doGet(request, response);
- }
- }
如果上传的是普通输入项,中文处理:
手工编码:inputValue = new String(inputValue.getBytes("iso8859-1"),"UTF-8");通过getString(): String inputValue = item.getString("UTF-8");
若用上个案例的方法上传中文文件,效果如下
修改UploadServlet.java,在普通输入项后面
- package com.hbsi.servlet;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.PrintWriter;
- import java.util.List;
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import javax.swing.filechooser.FileNameExtensionFilter;
- import org.apache.commons.fileupload.FileItem;
- import org.apache.commons.fileupload.disk.DiskFileItemFactory;
- import org.apache.commons.fileupload.servlet.ServletFileUpload;
- public class UploadServlet extends HttpServlet {
- public void doGet(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- /*
- //获取元素
- //不适用传统方式
- System.out.println(request.getParameter("username"));
- //Request对象提供了一个getInputStream方法,读取到客户端提交过来的数据
- InputStream in = request.getInputStream();
- byte[] buf = new byte[1024];
- int len=0;
- while((len=in.read(buf))>0){
- System.out.println(new String(buf,0,len));
- }*/
- try{
- //1.创建一个解析器工厂
- DiskFileItemFactory factory = new DiskFileItemFactory();
- //2.得到一个解析器
- ServletFileUpload upload = new ServletFileUpload(factory);
- //和jsp页面编码一致就好
- upload.setHeaderEncoding("UTF-8");
- //3.将请求传入解析器,对请求进行解析
- List<FileItem> list = upload.parseRequest(request);
- //4.迭代list集合,得到每个输入项的数据
- for(FileItem item : list){
- //5.判断item的类型
- if(item.isFormField()){
- //普通输入项
- String inputName = item.getFieldName();
- //如果上传的是普通输入项,中文处理:
- //1.手工编码
- //String inputValue = item.getString();
- //inputValue = new String(inputValue.getBytes("iso8859-1"),"UTF-8");
- //2.通过getString()
- String inputValue = item.getString("UTF-8");
- System.out.println(inputName+"="+inputValue);
- }else{
- //上传输入项
- String fileName = item.getName(); //获取到上传文件的文件名 浏览器不一样,获取的路径不一样,例如aa.txt c:\aaa\aa.txt
- //处理浏览器取值不一样
- fileName = fileName.substring(fileName.lastIndexOf("\\")+1);
- InputStream in = item.getInputStream();
- FileOutputStream out = new FileOutputStream("d:\\"+fileName);
- byte[] buf = new byte[1024];
- int len=0;
- while((len=in.read(buf))>0){
- out.write(buf,0,len);
- }
- in.close();
- out.close();
- }
- request.setAttribute("message","上传成功");
- }
- }catch (Exception e) {
- e.printStackTrace();
- request.setAttribute("message", "上传失败");
- }
- request.getRequestDispatcher("/upload/message.jsp").forward(request, response);
- }
- public void doPost(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- doGet(request, response);
- }
- }
![](http://img.my.csdn.net/uploads/201211/29/1354189990_5023.png)
如果没有填写第二个的输入项
if(!fileName.equals("")){ 。。。。 }
若用上个案例的方法上传中文文件,效果如下
修改UploadServlet.java,在else后面
- package com.hbsi.servlet;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.PrintWriter;
- import java.util.List;
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import javax.swing.filechooser.FileNameExtensionFilter;
- import org.apache.commons.fileupload.FileItem;
- import org.apache.commons.fileupload.disk.DiskFileItemFactory;
- import org.apache.commons.fileupload.servlet.ServletFileUpload;
- public class UploadServlet extends HttpServlet {
- public void doGet(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- /*
- * //获取元素 //不适用传统方式
- * System.out.println(request.getParameter("username"));
- * //Request对象提供了一个getInputStream方法,读取到客户端提交过来的数据 InputStream in =
- * request.getInputStream(); byte[] buf = new byte[1024]; int len=0;
- * while((len=in.read(buf))>0){ System.out.println(new
- * String(buf,0,len)); }
- */
- try {
- // 1.创建一个解析器工厂
- DiskFileItemFactory factory = new DiskFileItemFactory();
- // 2.得到一个解析器
- ServletFileUpload upload = new ServletFileUpload(factory);
- // 和jsp页面编码一致就好
- upload.setHeaderEncoding("UTF-8");
- // 3.将请求传入解析器,对请求进行解析
- List<FileItem> list = upload.parseRequest(request);
- // 4.迭代list集合,得到每个输入项的数据
- for (FileItem item : list) {
- // 5.判断item的类型
- if (item.isFormField()) {
- // 普通输入项
- String inputName = item.getFieldName();
- // 如果上传的是普通输入项,中文处理:
- // 1.手工编码
- // String inputValue = item.getString();
- // inputValue = new
- // String(inputValue.getBytes("iso8859-1"),"UTF-8");
- // 2.通过getString()
- String inputValue = item.getString("UTF-8");
- System.out.println(inputName + "=" + inputValue);
- } else {
- // 上传输入项
- String fileName = item.getName(); // 获取到上传文件的文件名
- // 浏览器不一样,获取的路径不一样,例如aa.txt
- // c:\aaa\aa.txt
- if (!fileName.equals("")) {
- // 处理浏览器取值不一样
- fileName = fileName.substring(fileName
- .lastIndexOf("\\") + 1);
- InputStream in = item.getInputStream();
- FileOutputStream out = new FileOutputStream("d:\\"
- + fileName);
- byte[] buf = new byte[1024];
- int len = 0;
- while ((len = in.read(buf)) > 0) {
- out.write(buf, 0, len);
- }
- in.close();
- out.close();
- }
- }
- request.setAttribute("message", "上传成功");
- }
- } catch (Exception e) {
- e.printStackTrace();
- request.setAttribute("message", "上传失败");
- }
- request.getRequestDispatcher("/upload/message.jsp").forward(request,
- response);
- }
- public void doPost(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- doGet(request, response);
- }
- }
![](http://img.my.csdn.net/uploads/201211/29/1354190178_9101.png)
删除临时文件
item.delete(); //删除item对应临时文件
- 由于文件大小超出DiskFileItemFactory.setSizeThreshold方法设置的内存缓冲区的大小时,Commons-fileupload组件将使用临时文件保存上传数据,因此在程序结束时,务必调用FileItem.delete方法删除临时文件。
- Delete方法的调用必须位于流关闭之后,否则会出现文件占用,而导致删除失败的情况。
WebRoot下新建文件夹temp
在创建工厂前加临时文件
- package com.hbsi.servlet;
- import java.io.File;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.PrintWriter;
- import java.util.List;
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import javax.swing.filechooser.FileNameExtensionFilter;
- import org.apache.commons.fileupload.FileItem;
- import org.apache.commons.fileupload.disk.DiskFileItemFactory;
- import org.apache.commons.fileupload.servlet.ServletFileUpload;
- public class UploadServlet extends HttpServlet {
- public void doGet(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- /*
- * //获取元素 //不适用传统方式
- * System.out.println(request.getParameter("username"));
- * //Request对象提供了一个getInputStream方法,读取到客户端提交过来的数据 InputStream in =
- * request.getInputStream(); byte[] buf = new byte[1024]; int len=0;
- * while((len=in.read(buf))>0){ System.out.println(new
- * String(buf,0,len)); }
- */
- try {
- // 1.创建一个解析器工厂
- DiskFileItemFactory factory = new DiskFileItemFactory();
- String tempPath = this.getServletContext().getRealPath("/temp");
- factory.setRepository(new File(tempPath));
- // 2.得到一个解析器
- ServletFileUpload upload = new ServletFileUpload(factory);
- // 和jsp页面编码一致就好
- upload.setHeaderEncoding("UTF-8");
- // 3.将请求传入解析器,对请求进行解析
- List<FileItem> list = upload.parseRequest(request);
- // 4.迭代list集合,得到每个输入项的数据
- for (FileItem item : list) {
- // 5.判断item的类型
- if (item.isFormField()) {
- // 普通输入项
- String inputName = item.getFieldName();
- // 如果上传的是普通输入项,中文处理:
- // 1.手工编码
- // String inputValue = item.getString();
- // inputValue = new
- // String(inputValue.getBytes("iso8859-1"),"UTF-8");
- // 2.通过getString()
- String inputValue = item.getString("UTF-8");
- System.out.println(inputName + "=" + inputValue);
- } else {
- // 上传输入项
- String fileName = item.getName(); // 获取到上传文件的文件名
- // 浏览器不一样,获取的路径不一样,例如aa.txt
- // c:\aaa\aa.txt
- if (!fileName.equals("")) {
- // 处理浏览器取值不一样
- fileName = fileName.substring(fileName
- .lastIndexOf("\\") + 1);
- InputStream in = item.getInputStream();
- FileOutputStream out = new FileOutputStream("d:\\"
- + fileName);
- byte[] buf = new byte[1024];
- int len = 0;
- while ((len = in.read(buf)) > 0) {
- out.write(buf, 0, len);
- }
- in.close();
- out.close();
- }
- }
- request.setAttribute("message", "上传成功");
- }
- } catch (Exception e) {
- e.printStackTrace();
- request.setAttribute("message", "上传失败");
- }
- request.getRequestDispatcher("/upload/message.jsp").forward(request,
- response);
- }
- public void doPost(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- doGet(request, response);
- }
- }
![](http://img.my.csdn.net/uploads/201211/29/1354192886_5897.png)
删除临时文件:
在关闭后添加delete方法
- package com.hbsi.servlet;
- import java.io.File;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.PrintWriter;
- import java.util.List;
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import javax.swing.filechooser.FileNameExtensionFilter;
- import org.apache.commons.fileupload.FileItem;
- import org.apache.commons.fileupload.disk.DiskFileItemFactory;
- import org.apache.commons.fileupload.servlet.ServletFileUpload;
- public class UploadServlet extends HttpServlet {
- public void doGet(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- /*
- * //获取元素 //不适用传统方式
- * System.out.println(request.getParameter("username"));
- * //Request对象提供了一个getInputStream方法,读取到客户端提交过来的数据 InputStream in =
- * request.getInputStream(); byte[] buf = new byte[1024]; int len=0;
- * while((len=in.read(buf))>0){ System.out.println(new
- * String(buf,0,len)); }
- */
- try {
- // 1.创建一个解析器工厂
- DiskFileItemFactory factory = new DiskFileItemFactory();
- String tempPath = this.getServletContext().getRealPath("/temp");
- factory.setRepository(new File(tempPath));
- // 2.得到一个解析器
- ServletFileUpload upload = new ServletFileUpload(factory);
- // 和jsp页面编码一致就好
- upload.setHeaderEncoding("UTF-8");
- // 3.将请求传入解析器,对请求进行解析
- List<FileItem> list = upload.parseRequest(request);
- // 4.迭代list集合,得到每个输入项的数据
- for (FileItem item : list) {
- // 5.判断item的类型
- if (item.isFormField()) {
- // 普通输入项
- String inputName = item.getFieldName();
- // 如果上传的是普通输入项,中文处理:
- // 1.手工编码
- // String inputValue = item.getString();
- // inputValue = new
- // String(inputValue.getBytes("iso8859-1"),"UTF-8");
- // 2.通过getString()
- String inputValue = item.getString("UTF-8");
- System.out.println(inputName + "=" + inputValue);
- } else {
- // 上传输入项
- String fileName = item.getName(); // 获取到上传文件的文件名
- // 浏览器不一样,获取的路径不一样,例如aa.txt
- // c:\aaa\aa.txt
- if (!fileName.equals("")) {
- // 处理浏览器取值不一样
- fileName = fileName.substring(fileName
- .lastIndexOf("\\") + 1);
- InputStream in = item.getInputStream();
- FileOutputStream out = new FileOutputStream("d:\\"
- + fileName);
- byte[] buf = new byte[1024];
- int len = 0;
- while ((len = in.read(buf)) > 0) {
- out.write(buf, 0, len);
- }
- in.close();
- out.close();
- item.delete(); //删除item对应临时文件
- }
- }
- request.setAttribute("message", "上传成功");
- }
- } catch (Exception e) {
- e.printStackTrace();
- request.setAttribute("message", "上传失败");
- }
- request.getRequestDispatcher("/upload/message.jsp").forward(request,
- response);
- }
- public void doPost(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- doGet(request, response);
- }
- }
![](http://img.my.csdn.net/uploads/201211/29/1354192986_2738.png)
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