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 >
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第二步:在servlet.xml中配置MultipartResolver:
复制代码 代码如下:
<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 "" ;
}
}
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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>
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注:通过jQuery来submit表单,以*拼装action url,*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