两种文件上传方式-优快云博客

本文链接：https://blog.youkuaiyun.com/yantingmei/article/details/20232749

本文介绍两种文件上传的方法：一种利用Servlet3.0实现文件上传，另一种通过Struts2框架完成文件上传过程。前者展示了如何使用Java Servlet API进行文件读取与保存；后者则通过Struts2的拦截器机制处理文件上传。

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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);	
	}
     
}

web.xml

<?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>

index.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 '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;
	}

}

struts.xml

<?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>

success.jsp

<%@ 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>

index.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 '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>