springmvc默认的解析器里面是没有加入对文件上传的解析的,，使用springmvc对文件上传的解析器来处理文件上传的时需要用springmvc提供的multipartresolver的申明，又因为commonsmultipartresolver实现了multipartresolver接口，所以我们可以在springmvc配置文件中这样配置：
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<bean id="multipartresolver" class="org.springframework.web.multipart.commons.commonsmultipartresolver"> <property name="defaultencoding" value="utf-8" /> <property name="maxuploadsize" value="10485760000" /> <property name="maxinmemorysize" value="40960" /> </bean> |
首先引入文件上传所需要的包,commons-logging-*.jar commons-io-*.jar commons-fileupload-*.jar
新建一个jsp页面.
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<%@ page language="java" contenttype="text/html; charset=utf-8" pageencoding="utf-8"%> <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <title>文件上传</title> </head> <body> <%--<form action="user/fileupload" method="post" enctype="multipart/form-data">--%> <form action="user/fileupload" method="post" enctype="multipart/form-data"> <input type="file" name="fileupload" /> <input type="submit" value="上传" /> </form> </body> </html> |
springmvc上传文件的形式有很多,这里我介绍两种.
第一种,看controller
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package gd.hz.springmvc.controller; import java.io.file; import java.io.ioexception; import org.springframework.stereotype.controller; import org.springframework.web.bind.annotation.requestmapping; import org.springframework.web.bind.annotation.requestmethod; import org.springframework.web.bind.annotation.requestparam; import org.springframework.web.multipart.commons.commonsmultipartfile; import org.springframework.web.servlet.modelandview; @controller("usercontroller") @requestmapping("user") public class usercontroller { // 处理文件上传一 @requestmapping(value = "fileupload", method = requestmethod.post) public modelandview fileupload( @requestparam("fileupload") commonsmultipartfile file) { // 获取文件类型 system.out.println(file.getcontenttype()); // 获取文件大小 system.out.println(file.getsize()); // 获取文件名称 system.out.println(file.getoriginalfilename()); // 判断文件是否存在 if (!file.isempty()) { string path = "d:/" + file.getoriginalfilename(); file localfile = new file(path); try { file.transferto(localfile); } catch (illegalstateexception e) { e.printstacktrace(); } catch (ioexception e) { e.printstacktrace(); } } return new modelandview("datasuccess"); } } |
类commonsmultipartfile为我们提供了许多对文件处理的方法.例如文件大小,上传文件名称,文件类型,具体用法可以查看spring的文档.transferto就是将文件输出到指定地方.
文件上传的第二种方法,这种方法比较常用:
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package gd.hz.springmvc.controller; import java.io.file; import java.io.ioexception; import java.util.iterator; import javax.servlet.http.httpservletrequest; import org.springframework.stereotype.controller; import org.springframework.web.bind.annotation.requestmapping; import org.springframework.web.bind.annotation.requestmethod; import org.springframework.web.multipart.multipartfile; import org.springframework.web.multipart.multiparthttpservletrequest; import org.springframework.web.multipart.commons.commonsmultipartresolver; @controller("usercontroller") @requestmapping("user") public class usercontroller { // 处理文件上传二 @requestmapping(value = "fileupload2", method = requestmethod.post) public string fileupload2(httpservletrequest request) throws illegalstateexception, ioexception { // 设置上下方文 commonsmultipartresolver multipartresolver = new commonsmultipartresolver( request.getsession().getservletcontext()); // 检查form是否有enctype="multipart/form-data" if (multipartresolver.ismultipart(request)) { multiparthttpservletrequest multirequest = (multiparthttpservletrequest) request; iterator<string> iter = multirequest.getfilenames(); while (iter.hasnext()) { // 由commonsmultipartfile继承而来,拥有上面的方法. multipartfile file = multirequest.getfile(iter.next()); if (file != null) { string filename = "demoupload" + file.getoriginalfilename(); string path = "d:/" + filename; file localfile = new file(path); file.transferto(localfile); } } } return "datasuccess"; } } |
multiparthttpservletrequest提供了更加灵活的方法,可以获取多个文件和文件名,可以遍历获得每个文件.
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://mylfd.iteye.com/blog/1893648
