(jsp和Servlet 功能篇) Servlet 实现文件上传

太过爱你忘了你带给我的痛 2023-10-18 21:53 94阅读 0赞

在开发过程中用得比较多的上传组件是commons-fileupload和japSmartUpload,这两个组件都可以很好的完成文件上传的功能!

此例用commons-fileupload.这个组件在[http://jakarta.apache.org/][http_jakarta.apache.org]右边的搜索里面就能找到,顺带下载commons-io,commons-fileupload组件需要它的支持!将这两个组件的jar包放到项目的WEB-INF/lib文件夹,此时commons-fileupload组件的配置就算完成了!下面贴上源码....

上传文件(servlet)代码：

package com.rf.upload;
    
    import java.io.File;
    import java.io.IOException;
    import java.io.PrintWriter;
    import java.util.Iterator;
    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.FileItemFactory;
    import org.apache.commons.fileupload.disk.DiskFileItemFactory;
    import org.apache.commons.fileupload.servlet.ServletFileUpload;
    
    public class UploadServlet extends HttpServlet {
    
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 1L;
    
    	@Override
    	public void doGet(HttpServletRequest request, HttpServletResponse response)
    			throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		// 判断提交过来的表单是否为文件上传菜单
    		boolean isMultipart = ServletFileUpload.isMultipartContent(request);
    		// 上传文件
    		if (isMultipart) {
    			// 构造一个文件上传处理对象
    			FileItemFactory factory = new DiskFileItemFactory();
    			ServletFileUpload upload = new ServletFileUpload(factory);
    			// 迭代类
    			Iterator items;
    			try {
    				// 解析表单中提交的所有文件内容
    				items = upload.parseRequest(request).iterator();
    				while (items.hasNext()) {
    					FileItem item = (FileItem) items.next();
    					// 取出上传文件的文件名称
    					String name = item.getName();
    					// 取得上传文件以后的存储路径
    					String fileName = name.substring(
    							name.lastIndexOf('\\') + 1, name.length());
    					// 上传文件以后的存储路径(Tomact项目部署创建file文件)
    					String path = request.getRealPath("file")
    							+ File.separatorChar + fileName;
    					// 上传文件
    					File uploaderFile = new File(path);
    					item.write(uploaderFile);
    					// 打印上传成功信息
    					response.setContentType("text/html");
    					response.setCharacterEncoding("GB2312");
    					PrintWriter out = response.getWriter();
    					out.print("<font size='2'>上传文件为:" + name + "<br>保存的地址为"
    							+ path + "</font>");
    				}
    
    			} catch (Exception e) {
    				e.printStackTrace();
    			}
    
    		}
    
    	}
    
    	@Override
    	public void doPost(HttpServletRequest req, HttpServletResponse resp)
    			throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		doGet(req, resp);
    	}
    
    }

页面代码（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">
    		
    	</head>
    
    	<body>
    		
    		<form action="FileUpload" enctype="multipart/form-data" method="post">
    			上传文件：
    			<input type="file" name="file1">
    			<br />
    			<input type="submit" value="提交" />
    		</form>
    	</body>
    </html>

结果截图：

![Center][]

[http_jakarta.apache.org]: http://jakarta.apache.org/
[Center]: https://img-blog.csdn.net/20130730164005265?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvemhvdXpoaXdlbmdhbmc=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center