Java开发过程中文件上传的各种方式全面总结
到目前为止：我接触到的有关上传的类型有这么几种
JSP+Servlet的，Struts2的，Struts的，FTP的，ExtJs的,Flex的
最终还是建议看看，后面详细写的Struts2的上传文章最为实用
第一：JSP+Servlet上传
这个最基础的上传示例[其实也可以完全在JSP上进行处理]
我选用的包是Apache commons fileupload.jar
下载地址:http://jakarta.apache.org/commons/fileupload/
JSP页面具体代码
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title>JSP+Servlet上传示例</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">
</head>
<body>
<form action="upload.do" method="post" enctype="multipart/form-data">
<input type ="file" name="file1" id="file1" /><br/>
<input type ="file" name="file2" if="file2"/><br/>
<input type ="file" name="file3" id="file3"/><br/>
<input type="submit" value="上传" />
</form>
</body>
</html>
上 面文件中有几个需要注意的地方就是
1. action="UploadServlet" 必须和后面的web.xml配置文件中对servlet映射必须保持一致.
2. method="POST" 这里必须为"POST"方式提交不能是"GET".
3. enctype="multipart/form-data" 这里是要提交的内容格式,表示你要提交的是数据流,而不是普通的表单
文本.
4. file1,file2,file3表示你要3个文件一起上传,你也可以一次只上传一个文件.
Servlet处理类程序
package com.upload.test;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.util.Streams;
public class UploadServlet extends HttpServlet {
File tmpDir = null;//初始化上传文件的临时存放目录
File saveDir = null;//初始化上传文件后的保存目录
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
try{
if(ServletFileUpload.isMultipartContent(request)){
DiskFileItemFactory dff = new DiskFileItemFactory();//创建该对象
dff.setRepository(tmpDir);// 指定上传文件的临时目录
dff.setSizeThreshold(1024000);//指定在内存中缓存数据大小,单位为byte
ServletFileUpload sfu = new ServletFileUpload(dff);//创建该对象
sfu.setFileSizeMax(5000000);// 指定单个上传文件的最大尺寸
sfu.setSizeMax(10000000);//指定一次上传多个文件的 总尺寸
FileItemIterator fii = sfu.getItemIterator(request);//解析request 请求,
并返回FileItemIterator集合
while(fii.hasNext()){
FileItemStream fis = fii.next();//从集合中获得一个文件流
if(!fis.isFormField() && fis.getName().length()>0){//过滤掉表单中非文件
域
String fileName = fis.getName().substring(fis.getName().lastIndexOf
("\\"));//获得上传文件的文件名
BufferedInputStream in = new BufferedInputStream(fis.openStream());//获
得文件输入流
BufferedOutputStream out = new BufferedOutputStream(new
FileOutputStream(new File(saveDir+fileName)));//获得文件输出流
Streams.copy(in, out, true);//开始把文件写到你指定的上传文件夹
}
}
response.getWriter().println("File upload successfully!!!");//终于成功了
,还不到你的上传文件中看看,你要的东西都到齐了吗
}
}catch(Exception e){
e.printStackTrace();
}
}
@Override
public void init() throws ServletException {
super.init();
/* 对上传文件夹和临时文件夹进行初始化
*
*/
String tmpPath = "c:\\tmpdir";
String savePath = "c:\\updir";
tmpDir = new File(tmpPath);
saveDir = new File(savePath);
if(!tmpDir.isDirectory())
tmpDir.mkdir();
if(!saveDir.isDirectory())
saveDir.mkdir();
}
}
第二：struts2的上传吧
upload.jsp-----------
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ taglib uri="/struts-tags" prefix="s"%> <% 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> </head> <body> <s:form action="test.action" method="POST" enctype="multipart/form-data"> <s:file label="选择文件" name="upFile"></s:file> <s:submit label="上传" /> </s:form> </body> </html>
UploadAction----------------
package com.upload.test;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
private File upFile;
private String upFileFileName; //上传的文件名 (1.系统自动注入 2.变量命名有规则: 前台
对象名+"FileName")
private String upFileContentType; //文件类型 (1.系统自动注入 2.变量命名有规
则: 前台对象名+"ContentType")
private String savePath;
@Override
public String execute() throws Exception {
System.out.println("xxxxxxxxxxxxxxxxxxxxxxxxxxx");
String path = "c:/" + upFileFileName;
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
try{
bis = new BufferedInputStream(new FileInputStream(upFile));
bos = new BufferedOutputStream(new FileOutputStream(path));
byte[] buf = new byte[(int)upFile.length()];
int len = 0;
while(((len=bis.read(buf))!=-1)){
bos.write(buf, 0, len);
}
}catch(Exception e){
e.printStackTrace();
}finally{
try{
if(bos!=null){
bos.close();
}
if(bis!=null){
bis.close();
}
}catch(Exception e){
bos = null;
bis = null;
}
}
return SUCCESS;
}
public File getUpFile() {
return upFile;
}
public void setUpFile(File upFile) {
this.upFile = upFile;
}
public String getUpFileFileName() {
return upFileFileName;
}
public void setUpFileFileName(String upFileFileName) {
this.upFileFileName = upFileFileName;
}
public String getUpFileContentType() {
return upFileContentType;
}
public void setUpFileContentType(String upFileContentType) {
this.upFileContentType = upFileContentType;
}
public String getSavePath() {
return savePath;
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
}
struts.xml-------
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<!-- 该属性指定Struts 2文件上传中整个请求内容允许的最大字节数 -->
<constant name="struts.multipart.maxSize" value="102400000000000" />
<package name="default" extends="struts-default" >
<action name="test" class="com.upload.test.TestAction">
<result >/index.jsp</result>
</action>
</package>
</struts>
web.xml------
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
特别说明这条的必要性，可以使你上传任意大小文件
<constant name="struts.multipart.maxSize" value="102400000000000" />
关于FLEX的上传在我博客文章：http://javacrazyer.iteye.com/blog/707693
关于EXT的上传在我博客文章：http://javacrazyer.iteye.com/blog/707510
关于FTP的上传在我的博客文章：http://javacrazyer.iteye.com/blog/675440
关于Struts的上传在我的博客文章： http://javacrazyer.iteye.com/blog/619016