第一种采用Servlet3.0的上传：
UploadServlet.java
package action;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Collection;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
//注释3.0版本使用
@MultipartConfig
public class UploadServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Part part=request.getPart("file");
response.setContentType("text/html;charset=GBK");
PrintWriter out=response.getWriter();
String fileName=request.getParameter("name");
out.println("上传文件的类型："+part.getContentType()+"<br/>");
out.println("上传文件大小："+part.getSize()+"<br/>");
Collection<String> headerNames=part.getHeaderNames();
for(String headerName:headerNames){
out.println(headerName+"---->"+part.getHeader(headerName)+"<br/>");
}
part.write(getServletContext().getRealPath("/uploadFiles")+"/"+fileName);
}
}
<?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_9" 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> <servlet-name>upload</servlet-name> <servlet-class>action.UploadServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>upload</servlet-name> <url-pattern>/uploadServlet</url-pattern> </servlet-mapping> </web-app>
<%@ 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="/Uploads/uploadServlet" method="post" enctype="multipart/form-data">
文件名：<input type="text" name="name"/>
文件：<input type="file" name="file"/>
<input type="submit"/>
</form>
</body>
</html>
第二种采用struts2文件上传：
UploadAction.java
package action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
/**
*
*/
private static final long serialVersionUID = 1L;
private String title;
private File uploadfile;
private String uploadfileContentType;
private String uploadfileFileName;
private String savePath;
public String upload() throws Exception {
FileInputStream fis = new FileInputStream(getUploadfile());
FileOutputStream fos=new FileOutputStream(getSavePath()+"\\"+getUploadfileFileName());
byte[] buffer=new byte[1024];
int len=0;
while((len=fis.read(buffer))>0){
fos.write(buffer,0,len);
}
fos.close();
fis.close();
return SUCCESS;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public File getUploadfile() {
return uploadfile;
}
public void setUploadfile(File uploadfile) {
this.uploadfile = uploadfile;
}
public String getUploadfileContentType() {
return uploadfileContentType;
}
public void setUploadfileContentType(String uploadfileContentType) {
this.uploadfileContentType = uploadfileContentType;
}
public String getUploadfileFileName() {
return uploadfileFileName;
}
public void setUploadfileFileName(String uploadfileFileName) {
this.uploadfileFileName = uploadfileFileName;
}
public String getSavePath() {
return ServletActionContext.getServletContext().getRealPath(savePath);//得到绝对路径
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
}
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <package name="hello" namespace="/hello" extends="struts-default"> <action name="login" class="action.UploadAction" method="upload"> <param name="savePath">/uploadFiles</param> <result name="success"> /success.jsp </result> </action> </package> </struts>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@taglib prefix="s" uri="/struts-tags"%> </head> <% String path = request.getContextPath(); System.out.println(path); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; System.out.println(basePath); %> <body> 上传成功！<br> 文件标题：<s:property value="title"/><br> 文件为:<img src="<%=basePath%><s:property value="‘uploadFiles/‘+uploadfileFileName"/>"/><br> </body> </html>
<%@ 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="/Upload/hello/login" method="post" enctype="multipart/form-data">
文件名：<input type="text" name="title"/>
文件：<input type="file" name="uploadfile"/>
<input type="submit"/>
</form>
</body>
</html>
原文：http://blog.csdn.net/yantingmei/article/details/20232749