简单几步,实现SpringMVC+servlet3.0文件上传功能:
第一步:配置web.xml文件中的servlet,添加multipart-config:
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<!-- SpringMVC --> < servlet > < servlet-name >myWeb</ servlet-name > < servlet-class >org.springframework.web.servlet.DispatcherServlet</ servlet-class > < init-param > < param-name >contextConfigLocation</ param-name > < param-value >classpath:springmvc/servlet.xml</ param-value > </ init-param > < load-on-startup >1</ load-on-startup > < multipart-config > <!-- <location>/</location> --> < max-file-size >5242880</ max-file-size > <!--单个文件最大大小:5MB--> < max-request-size >20971520</ max-request-size > <!--所有文件最大大小:20MB--> < file-size-threshold >0</ file-size-threshold > <!-- 超过这个大小直接存硬盘,而不是内存 --> </ multipart-config > </ servlet > < servlet-mapping > < servlet-name >myWeb</ servlet-name > < url-pattern >/</ url-pattern > </ servlet-mapping > |
第二步:在servlet.xml中配置MultipartResolver:
<bean id="multipartResolver" class="org.springframework.web.multipart.support.StandardServletMultipartResolver"/>
第三步:创建接收form表单的Controller:
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package com.xjj.web.controller; import java.io.File; import java.io.IOException; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.Part; import org.springframework.stereotype.Controller; import org.springframework.util.StringUtils; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import com.xjj.json.JsonResult; /** * 文件上传 * @author XuJijun * */ @Controller @RequestMapping ( "/servlet/file" ) public class FileUploadController { /** * 保存文件的目录,放在web目录、或一个指定的绝对目录下 */ private static final String SAVE_DIR = "uploadFiles" ; @RequestMapping ( "/upload" ) public @ResponseBody JsonResult upload(HttpServletRequest request, HttpServletResponse response, @RequestParam Map<String, Object> p) throws ServletException, IOException { // 获取 web application的绝对路径 String appPath = request.getServletContext().getRealPath( "" ); // 构造文件存放的路径 String savePath = appPath + File.separator + SAVE_DIR; // 如果文件存放路径不存在,则mkdir一个 File fileSaveDir = new File(savePath); if (!fileSaveDir.exists()) { fileSaveDir.mkdir(); } for (Part part : request.getParts()) { String fileName = extractFileName(part); if (!StringUtils.isEmpty(fileName)){ part.write(savePath + File.separator + fileName); } } return new JsonResult( "200" , "文件上传成功!" , savePath); } /** * 从content-disposition头中获取源文件名 * * content-disposition头的格式如下: * form-data; name="dataFile"; filename="PHOTO.JPG" * * @param part * @return */ private String extractFileName(Part part) { String contentDisp = part.getHeader( "content-disposition" ); String[] items = contentDisp.split( ";" ); for (String s : items) { if (s.trim().startsWith( "filename" )) { return s.substring(s.indexOf( "=" ) + 2 , s.length()- 1 ); } } return "" ; } } |
其中,request.getParts()用来获取multipart,其中就包括文件。其他<input type="text">参数由@RequestParam Map<String, Object> p接收。
第四步:form表单提交文件以及其他数据:
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<html> <head> <meta charset= "UTF-8" > <link href= "../resources/css/common.css" rel= "external nofollow" rel= "stylesheet" /> <script src= "../resources/js/jquery-2.1.4.js" ></script> </head> <body> <h2>File Upload</h2> <form method= "post" enctype= "multipart/form-data" > <input type= "text" name= "aaa" /><br/> 选择要上传的文件:<input type= "file" name= "file" size= "60" /><br/> <input type= "file" name= "file" size= "60" /><br/> <br/> <!-- <input type= "submit" value= "开始上传" /> --> </form> <input type= "button" value= "上传吧" onclick= "upload()" /> </body> <script> function upload(){ $( "form" ).attr( 'action' , "http://localhost:8080/MyJavaStudio/servlet/file/upload" ); $( "form" ).submit(); } </script> </html> |
注:通过jQuery来submit表单,以自由拼装action url,自由定义提交按钮。
github:https://github.com/xujijun/MyJavaStudio
完整代码下载:MyJavaStudio.rar
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://blog.csdn.net/clementad/article/details/49533189