JSP Servlet学习笔记——使用fileupload上传文件
来源:互联网 发布:怎么找自己的淘宝店铺 编辑:程序博客网 时间:2024/06/04 23:31
分类: java web2012-10-23 17:10 3559人阅读 评论(2) 收藏 举报
servletjspfileinputstringexception
关键代码如下:
index.jsp
[html] view plaincopyprint?
- <body>
- <center>
- <h3>文件上传</h3>
- <font color="red"><%=request.getAttribute("msg")==null?"":request.getAttribute("msg") %> </font>
- <form enctype="multipart/form-data" method="post" action="servlet/FileUploadServlet">
- 文件描述:<input type="text" name="text" /><br/>
- 选择文件:<input type="file" name="file1" /><br/>
- 选择文件:<input type="file" name="file2" /><br/>
- 选择文件:<input type="file" name="file3" /><br/>
- 选择文件:<input type="file" name="file4" /><br/>
- 选择文件:<input type="file" name="file5" /><br/>
- <input type="submit" value="上传" />
- </form>
- </center>
- </body>
FileUploadServlet.jsp
[java] view plaincopyprint?
- package com.accp.fileupload.servlet;
- import java.io.File;
- import java.io.IOException;
- 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.FileUploadException;
- import org.apache.commons.fileupload.FileUploadBase.FileSizeLimitExceededException;
- import org.apache.commons.fileupload.disk.DiskFileItemFactory;
- import org.apache.commons.fileupload.servlet.ServletFileUpload;
- public class FileUploadServlet extends HttpServlet {
- private static final long serialVersionUID = 2827297299439162553L;
- public void doGet(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- //使用同一种处理方法
- doPost(request, response);
- }
- public void doPost(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- request.setCharacterEncoding("UTF-8");
- response.setContentType("text/html; charset=UTF-8");
- //保存路径
- String savePath = getServletContext().getRealPath("/upload");
- File saveDir = new File(savePath);
- // 如果目录不存在,就创建目录
- if(!saveDir.exists()){
- saveDir.mkdir();
- }
- // 创建文件上传核心类
- DiskFileItemFactory factory = new DiskFileItemFactory();
- ServletFileUpload sfu = new ServletFileUpload(factory);
- //设置编码
- sfu.setHeaderEncoding("UTF-8");
- // 设置上传的单个文件的最大字节数为2M
- sfu.setFileSizeMax(1024*1024*2);
- //设置整个表单的最大字节数为10M
- sfu.setSizeMax(1024*1024*10);
- try{
- // 处理表单请求
- List<FileItem> itemList = sfu.parseRequest(request);
- for (FileItem fileItem : itemList) {
- // 对应表单中的控件的name
- String fieldName = fileItem.getFieldName();
- System.out.println("控件名称:" + fieldName);
- // 如果是普通表单控件
- if(fileItem.isFormField()){
- String value = fileItem.getString();
- //重新编码,解决乱码
- value = new String(value.getBytes("ISO-8859-1"),"UTF-8");
- System.out.println("普通内容:" + fieldName + "=" + value);
- // 上传文件
- }else{
- // 获得文件大小
- Long size = fileItem.getSize();
- // 获得文件名
- String fileName = fileItem.getName();
- System.out.println("文件名:"+fileName+"\t大小:" + size + "byte");
- //设置不允许上传的文件格式
- if(fileName.endsWith(".exe")){
- request.setAttribute("msg", "不允许上传的类型!");
- }else{
- //将文件保存到指定的路径
- File file = new File(savePath,fileName);
- fileItem.write(file);
- request.setAttribute("msg", "上传成功!");
- }
- }
- }
- }catch(FileSizeLimitExceededException e){
- request.setAttribute("msg", "文件太大");
- }catch(FileUploadException e){
- e.printStackTrace();
- }catch(Exception e){
- e.printStackTrace();
- }
- //上传完毕后 转发到首页
- request.getRequestDispatcher("/index.jsp").forward(request, response);
- }
- }
相似Demo补充:
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
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.FileUploadException;
import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class FileUploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public FileUploadServlet() {
super();
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
final long MAX_SIZE = 300 * 1024 * 1024;// 设置上传文件最大值
// 允许上传的文件格式的列表
final String[] allowedExt = new String[] {"jpg", "jpeg", "gif", "txt",
"doc","mp3", "wma", "m4a","rar","zip" };
response.setContentType("text/html");
// 设置字符编码为UTF-8, 统一编码,处理出现乱码问题
response.setCharacterEncoding("UTF-8");
// 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload
DiskFileItemFactory dfif = new DiskFileItemFactory();
dfif.setSizeThreshold(4096);// 设置上传文件时用于临时存放文件的内存大小,这里是4K.多于的部分将临时存在硬盘
dfif.setRepository(new File(request.getRealPath("/")
+ "ImagesUploadTemp"));// 设置存放临时文件的目录,web根目录下的ImagesUploadTemp目录
// 用以上工厂实例化上传组件
ServletFileUpload sfu = new ServletFileUpload(dfif);
// 设置最大上传大小
sfu.setSizeMax(MAX_SIZE);
PrintWriter out = response.getWriter();
// 从request得到所有上传域的列表
List fileList = null;
try {
fileList = sfu.parseRequest(request);
} catch (FileUploadException e) {// 处理文件尺寸过大异常
if (e instanceof SizeLimitExceededException) {
out.println("文件尺寸超过规定大小:" + MAX_SIZE + "字节<p />");
out.println("<a href=\"FileUpload.html\" target=\"_top\">返回</a>");
return;
}
e.printStackTrace();
}
// 没有文件上传
if (fileList == null || fileList.size() == 0) {
out.println("请选择上传文件<p />");
out.println("<a href=\"FileUpload.html\" target=\"_top\">返回</a>");
return;
}
// 得到所有上传的文件
Iterator fileItr = fileList.iterator();
// 循环处理所有文件
while (fileItr.hasNext()) {
FileItem fileItem = null;
String path = null;
long size = 0;
// 得到当前文件
fileItem = (FileItem) fileItr.next();
// 忽略简单form字段而不是上传域的文件域(<input type="text" />等)
if (fileItem == null || fileItem.isFormField()) {
continue;
}
// 得到文件的完整路径
path = fileItem.getName();
// 得到文件的大小
size = fileItem.getSize();
if ("".equals(path) || size == 0) {
out.println("请选择上传文件<p />");
out.println("<a href=\"FileUpload.html\" target=\"_top\">返回</a>");
return;
}
// 得到去除路径的文件名
String t_name = path.substring(path.lastIndexOf("\\") + 1);
// 得到文件的扩展名(无扩展名时将得到全名)
String t_ext = t_name.substring(t_name.lastIndexOf(".") + 1);
// 拒绝接受规定文件格式之外的文件类型
int allowFlag = 0;
int allowedExtCount = allowedExt.length;
for (; allowFlag < allowedExtCount; allowFlag++) {
if (allowedExt[allowFlag].equals(t_ext))
break;
}
if (allowFlag == allowedExtCount) {
out.println("请上传以下类型的文件<p />");
for (allowFlag = 0; allowFlag < allowedExtCount; allowFlag++)
out.println("*." + allowedExt[allowFlag]
+ " ");
out.println("<p /><a href=\"FileUpload.html\" target=\"_top\">返回</a>");
return;
}
long now = System.currentTimeMillis();
// 根据系统时间生成上传后保存的文件名
String prefix = String.valueOf(now);
// 保存的最终文件完整路径,保存在web根目录下的ImagesUploaded目录下
// String u_name = request.getRealPath("/") + "ImagesUploaded/"
// + prefix + "." + t_ext;
String filename = prefix + "." + t_ext;
try {
// 保存文件到C:\\upload目录下
fileItem.write(new File("H:/我的工作空间ee/Megashop/WebContent/images/goods/"+filename));
System.out.println("文件"+filename);
out.println("文件上传成功. 已保存为: " + prefix + "." + t_ext
+ " 文件大小: " + size + "字节<p />");
out.println("<a href=\"FileUpload.html\" target=\"_top\">继续上传</a>");
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
import java.io.IOException;
import java.io.PrintWriter;
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.FileUploadException;
import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class FileUploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public FileUploadServlet() {
super();
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
final long MAX_SIZE = 300 * 1024 * 1024;// 设置上传文件最大值
// 允许上传的文件格式的列表
final String[] allowedExt = new String[] {"jpg", "jpeg", "gif", "txt",
"doc","mp3", "wma", "m4a","rar","zip" };
response.setContentType("text/html");
// 设置字符编码为UTF-8, 统一编码,处理出现乱码问题
response.setCharacterEncoding("UTF-8");
// 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload
DiskFileItemFactory dfif = new DiskFileItemFactory();
dfif.setSizeThreshold(4096);// 设置上传文件时用于临时存放文件的内存大小,这里是4K.多于的部分将临时存在硬盘
dfif.setRepository(new File(request.getRealPath("/")
+ "ImagesUploadTemp"));// 设置存放临时文件的目录,web根目录下的ImagesUploadTemp目录
// 用以上工厂实例化上传组件
ServletFileUpload sfu = new ServletFileUpload(dfif);
// 设置最大上传大小
sfu.setSizeMax(MAX_SIZE);
PrintWriter out = response.getWriter();
// 从request得到所有上传域的列表
List fileList = null;
try {
fileList = sfu.parseRequest(request);
} catch (FileUploadException e) {// 处理文件尺寸过大异常
if (e instanceof SizeLimitExceededException) {
out.println("文件尺寸超过规定大小:" + MAX_SIZE + "字节<p />");
out.println("<a href=\"FileUpload.html\" target=\"_top\">返回</a>");
return;
}
e.printStackTrace();
}
// 没有文件上传
if (fileList == null || fileList.size() == 0) {
out.println("请选择上传文件<p />");
out.println("<a href=\"FileUpload.html\" target=\"_top\">返回</a>");
return;
}
// 得到所有上传的文件
Iterator fileItr = fileList.iterator();
// 循环处理所有文件
while (fileItr.hasNext()) {
FileItem fileItem = null;
String path = null;
long size = 0;
// 得到当前文件
fileItem = (FileItem) fileItr.next();
// 忽略简单form字段而不是上传域的文件域(<input type="text" />等)
if (fileItem == null || fileItem.isFormField()) {
continue;
}
// 得到文件的完整路径
path = fileItem.getName();
// 得到文件的大小
size = fileItem.getSize();
if ("".equals(path) || size == 0) {
out.println("请选择上传文件<p />");
out.println("<a href=\"FileUpload.html\" target=\"_top\">返回</a>");
return;
}
// 得到去除路径的文件名
String t_name = path.substring(path.lastIndexOf("\\") + 1);
// 得到文件的扩展名(无扩展名时将得到全名)
String t_ext = t_name.substring(t_name.lastIndexOf(".") + 1);
// 拒绝接受规定文件格式之外的文件类型
int allowFlag = 0;
int allowedExtCount = allowedExt.length;
for (; allowFlag < allowedExtCount; allowFlag++) {
if (allowedExt[allowFlag].equals(t_ext))
break;
}
if (allowFlag == allowedExtCount) {
out.println("请上传以下类型的文件<p />");
for (allowFlag = 0; allowFlag < allowedExtCount; allowFlag++)
out.println("*." + allowedExt[allowFlag]
+ " ");
out.println("<p /><a href=\"FileUpload.html\" target=\"_top\">返回</a>");
return;
}
long now = System.currentTimeMillis();
// 根据系统时间生成上传后保存的文件名
String prefix = String.valueOf(now);
// 保存的最终文件完整路径,保存在web根目录下的ImagesUploaded目录下
// String u_name = request.getRealPath("/") + "ImagesUploaded/"
// + prefix + "." + t_ext;
String filename = prefix + "." + t_ext;
try {
// 保存文件到C:\\upload目录下
fileItem.write(new File("H:/我的工作空间ee/Megashop/WebContent/images/goods/"+filename));
System.out.println("文件"+filename);
out.println("文件上传成功. 已保存为: " + prefix + "." + t_ext
+ " 文件大小: " + size + "字节<p />");
out.println("<a href=\"FileUpload.html\" target=\"_top\">继续上传</a>");
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
0 0
- JSP Servlet学习笔记——使用fileupload上传文件
- JSP Servlet学习笔记——使用fileupload上传文件
- JSP Servlet学习笔记——使用fileupload上传文件
- JSP Servlet学习笔记——使用fileupload上传文件
- Jsp上传文件(FileUpload+Servlet)
- 在jsp/servlet中使用apache FileUpload组件文件上传(jsp,servlet,fileupload)
- struts2学习笔记(10)——使用fileupload进行文件上传
- struts2学习笔记(10)——使用fileupload进行文件上传
- Servlet使用commons-fileupload实现文件上传
- 使用FileUpload实现Servlet的文件上传
- JSP使用commons-fileupload实现文件上传
- Jsp 使用commons-fileupload实现文件上传
- Jsp 使用 fileupload 文件上传和下载
- jsp servlet使用 fileupload
- JSP+Servlet使用commons-fileupload上传文件连接被重置解决方案
- JSP+Servlet +commons-fileupload-1.2.1实现文件上传
- Servlet上传文件,commons-fileupload
- JSP 使用smartupload上传文件,JSP+servlet
- Upstart笔记(by quqi99)
- 曲线拟合
- Python3.4读写Excel
- 阿里巴巴研发工程师 笔试题最后大题(数据库查询)
- 用java写一个小型的聊天窗口 新手学java
- JSP Servlet学习笔记——使用fileupload上传文件
- JavaWeb 用Intellij IDEA创建基于tomcat和jetty的Servlet
- 关于 hot code replace fail 问题
- windows动态库的问题调试
- CAS 实现单点登录(SSO)数据库查询认证机制-xml方式(三)
- ARM flash文件系统分区
- adb不是内部或外部命令,也不是可运行的程序
- codeforces 536 c Tavas and Pashmaks
- Object(所有类的超类)一些有用的方法讲解与实例演示