1.FileUploadServlet.java文件，實現上傳處理
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.DecimalFormat;
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 = 2048 * 1024 * 1024;// 設置上傳文件最大值為2G，可以改為更大
// 允許上傳的文件格式的列表
final String[] allowedExt = new String[]
{ "exe","jpg","DT" };
response.setContentType("text/html");
// 設置字符編碼為UTF-8, 統一編碼，處理出現亂碼問題
response.setCharacterEncoding("UTF-8");
// 實例化一個硬盤文件工廠,用來配置上傳組件ServletFileUpload
DiskFileItemFactory dfif = new DiskFileItemFactory();
// 用以上工廠實例化上傳組件
ServletFileUpload sfu = new ServletFileUpload(dfif);
// 設置最大上傳大小
sfu.setSizeMax(MAX_SIZE);
PrintWriter out = response.getWriter();
// 從request得到所有上傳域的列表
List fileList = null;
try
{
fileList = sfu.parseRequest(request);
} catch (FileUploadException e)
{// 處理文件尺寸過大異常
if (e instanceof SizeLimitExceededException)
{
out.println("文件尺寸超過規定大小:" + MAX_SIZE + "字節p />");
out.println("a href=\"FileUpload.html\" target=\"_top\">返回/a>");
return;
}
e.printStackTrace();
}
// 沒有文件上傳
if (fileList == null || fileList.size() == 0)
{
out.println("請選擇上傳文件p />");
out.println("a href=\"FileUpload.html\" target=\"_top\">返回/a>");
return;
}
//文件大小取兩位小數
DecimalFormat digit=new DecimalFormat("0.00");
// 得到所有上傳的文件
Iterator fileItr = fileList.iterator();
// 循環處理所有文件
while (fileItr.hasNext())
{
FileItem fileItem = null;
String path = null;
double size = 0;
// 得到當前文件
fileItem = (FileItem) fileItr.next();
// 忽略簡單form字段而不是上傳域的文件域(input type="text" />等)
if (fileItem == null || fileItem.isFormField())
{
continue;
}
// 得到文件的大小，K為單位并保留兩位小數
size = (double)fileItem.getSize()/1024;
if ("".equals(path) || size == 0)
{
out.println("html>head>title>上傳處理界面/title>/head>");
out.println("請選擇上傳文件p />");
out.println("a href=\"FileUpload.html\" target=\"_top\">返回/a>");
out.println("/html>");
return;
}
// 得到文件的完整路徑
path = fileItem.getName();
// 得到去除路徑的文件名
String t_name = path.substring(path.lastIndexOf("\\") + 1);
// 得到文件的擴展名(無擴展名時將得到全名)
String t_ext = t_name.substring(t_name.lastIndexOf(".") + 1);
// 拒絕接受規定文件格式之外的文件類型
int allowFlag = 0;
int allowedExtCount = allowedExt.length;
for (; allowFlag allowedExtCount; allowFlag++)
{
if (allowedExt[allowFlag].equals(t_ext))
break;
}
if (allowFlag == allowedExtCount)
{
out.println("html>head>title>上傳處理界面/title>/head>");
out.println("請上傳以下類型的文件p />");
for (allowFlag = 0; allowFlag allowedExtCount; allowFlag++)
out.println("*." + allowedExt[allowFlag]
+ "nbsp;nbsp;nbsp;");
out.println("p />a href=\"FileUpload.html\" target=\"_top\">返回/a>");
out.println("/html>");
return;
}
try
{
// 保存文件到服務器根目錄下
fileItem.write(new File("\\"+t_name));
System.out.println(t_name);
out.println("html>head>title>上傳處理界面/title>/head>");
out.println("文件名稱為：" + path + "br>");
out.println("文件上傳成功， 已保存為: " + t_name
+ "br>"+" 文件大小: " + digit.format(size) + "K p />");
out.println("a href=\"FileUpload.html\" target=\"_top\">繼續上傳/a>");
out.println("/html>");
} catch (Exception e)
{
e.printStackTrace();
}
}
}
}
2.FileUpload.html文件，實現上傳頁面。
html>
head>
meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
title>文件上傳/title>
/head>
body>
form action="FileUploadServlet" method="post"
enctype="multipart/form-data">
input type="file" size="30"
name="file01" />br>
pre> input name="submit" type="submit" value="上傳"> input name="reset" type="reset" value="重置">
/pre>
/form>
/body>
/html>
3.配置web.xml文件中的的servlet和過濾器，過濾器解決上傳文件名為中文時出現亂碼。
?xml version="1.0" encoding="UTF-8"?>
web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
servlet>
display-name>FileUploadServlet/display-name>
servlet-name>FileUploadServlet/servlet-name>
servlet-class>FileUploadServlet/servlet-class>
/servlet>
servlet-mapping>
servlet-name>FileUploadServlet/servlet-name>
url-pattern>/FileUploadServlet/url-pattern>
/servlet-mapping>
filter>
filter-name>setCharacterEncoding /filter-name>
filter-class>com.xulu.EncodingChange/filter-class>
init-param>
param-name>ignore /param-name>
param-value>true /param-value>
/init-param>
init-param>
param-name>encoding /param-name>
param-value>UTF-8 /param-value>
/init-param>
/filter>
filter-mapping>
filter-name>setCharacterEncoding /filter-name>
url-pattern>/* /url-pattern>
/filter-mapping>
welcome-file-list>
welcome-file>index.jsp/welcome-file>
/welcome-file-list>
login-config>
auth-method>BASIC/auth-method>
/login-config>
/web-app>
4.過濾器文件EncodingChange.java和setCharacterEncoding.java分別如下，并且在根目錄下的WEB-INF\classes\com\xulu文件夾中放入他它們編譯生成的.class文件
package com.xulu;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class EncodingChange implements Filter
{
protected String encoding = null;
protected FilterConfig filterconfig = null;
protected boolean ignore = true;
public void destroy()
{
this.encoding = null;
this.filterconfig = null;
}
public void doFilter(ServletRequest requests, ServletResponse responses,
FilterChain chain) throws IOException, ServletException
{
// TODO Auto-generated method stub
HttpServletRequest request = (HttpServletRequest) requests;
HttpServletResponse response = (HttpServletResponse) responses;
if (ignore || request.getCharacterEncoding() == null)
{
String encoding = selectEncoding(request);
if (encoding != null)
{
request.setCharacterEncoding(encoding);
request.getSession().getAttribute("Login_Student");
request.getSession().getAttribute("Login_Teacher");
request.getSession().getAttribute("Login_Admin");
}
}
chain.doFilter(request, response);
}
public void init(FilterConfig filterconfig) throws ServletException
{
// TODO Auto-generated method stub
this.filterconfig = filterconfig;
this.encoding = filterconfig.getInitParameter("encoding");
String value = filterconfig.getInitParameter("ignore");
if (value == null)
{
this.ignore = true;
} else if (value.equalsIgnoreCase("true"))
{
this.ignore = true;
} else if (value.equalsIgnoreCase("yes"))
{
this.ignore = true;
} else
{
this.ignore = false;
}
}
public String selectEncoding(ServletRequest request)
{
return this.encoding;
}
}
和
package com.xulu;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class setCharacterEncoding implements Filter{
protected String encoding=null;
protected FilterConfig filterconfig=null;
protected boolean ignore=true;
public void destroy() {
this.encoding=null;
this.filterconfig=null;
}
public void doFilter(ServletRequest requests, ServletResponse responses,
FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletRequest request=(HttpServletRequest)requests;
HttpServletResponse response=(HttpServletResponse)responses;
if(ignore||request.getCharacterEncoding()==null){
String encoding=selectEncoding(request);
if(encoding!=null){
request.setCharacterEncoding(encoding);
request.getSession().getAttribute("Login_Student");
request.getSession().getAttribute("Login_Teacher");
request.getSession().getAttribute("Login_Admin");
}
}
chain.doFilter(request, response);
}
public void init(FilterConfig filterconfig) throws ServletException {
// TODO Auto-generated method stub
this.filterconfig = filterconfig;
this.encoding = filterconfig.getInitParameter("encoding");
String value = filterconfig.getInitParameter("ignore");
if (value == null) {
this.ignore = true;
} else if (value.equalsIgnoreCase("true")) {
this.ignore = true;
} else if (value.equalsIgnoreCase("yes")) {
this.ignore = true;
} else {
this.ignore = false;
}
}
public String selectEncoding(ServletRequest request){
return this.encoding;
}
}
5.在瀏覽器中就可以實現頁面的上傳了，訪問http://localhost:8080/**/FileUpload.html就可以了。其中**為自己命名的web文件夾，如DoUpload，上面的文件都在該目錄里，且DoUpload文件夾放在Tomcat的webapp文件夾下。
補充：在上述所有步驟之前需引入三個.jar文件，分別為commons-fileupload-1.2.1.jar，commons-io-1.4.jar和servlet-api.jar網上可以下載到
以上就是小編為大家帶來的用fileupload組件實現的大文件上傳簡單實例的全部內容了，希望對大家有所幫助，多多支持腳本之家~
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