标签:efault lang app erp instance property type 页面 import
在Spring MVC中有两种实现上传文件的办法,第一种是Servlet3.0以下的版本通过commons-fileupload与commons-io完成的通用上传,第二种是Servlet3.0以上的版本的Spring内置标准上传,不需借助第3方组件。通用上传也兼容Servlet3.0以上的版本
Servlet3.0以下的通过commons-fileupload上传
1.添加上传依赖包
一个是文件上传的jar包,一个是其所依赖的IO包。这两个jar包,均在Spring支持库的org.apache.commons中
2.index.jsp(文件上传页面)
<%@ 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%>"> <style type="text/css"> form{ background-color:pink; width:500px; } </style> <title>单个文件上传</title> </head> <body> <form action="${pageContext.request.contextPath }/first.do" method="post" enctype="multipart/form-data"> <h1>文件上传</h1> 文件:<input type="file" name="uploadFile"/><br/> <input type="submit" value="上传"/> </form> </body> </html>
applicationContext.xml
先在大配置中配置个包扫描器,后面的后续会引出
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd "> <!-- 包扫描器 --> <context:component-scan base-package="cn.controller"></context:component-scan> </beans>
书写处理器
package cn.controller; import java.io.File; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.multipart.MultipartFile; /** * * @author 景佩佩 * */ @Controller public class MyController{ //处理器方法 @RequestMapping(value="/first.do") //springmvc类型 /** * 将文件对象保存到文件(图片)服务器上 Nugux * * @param uploadFile 从页面上过来的真实文件对象 * @return * @throws Exception */ public String doFirst(MultipartFile uploadFile,HttpSession session) throws Exception{ //所有文件上传 //1.xxx:获取文件名作为保存到服务器的文件名称 1.jpg String filename = uploadFile.getOriginalFilename();
//2.前半部分路径,目录,将WebRoot下一个名称为images文件夹 转换成绝对路径 String leftPath = session.getServletContext().getRealPath("/images"); //3.进行路径拼接=前半部分路径+文件名称 File file=new File(leftPath,filename); //4.做保存 uploadFile.transferTo(file); return "welcome.jsp"; } }
如果我们现在启动服务器,会报错
在applicationContext.xml配置文件上传解析器
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd "> <!-- 配置包扫描器--> <context:component-scan base-package="cn.controller"></context:component-scan> <!-- 文件上传解析器 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean> </beans>
但是启动的话还是会报错,因为我们没有配置注解驱动
如果我们没有写解析器的ID的话,就会报另外的错
文件上传大小设置
如果超过限制的大小的话会报如下的错
没有选择要上传的文件
如果没有选择要上传的文件,可以通过如下判断代码回到错误页
限制上传的文件
如果我们上传的文件中有乱码的问题,我们可以使用以下两种方式
1)
2)
<filter> <filter-name>characterEncoding</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping
首先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%>"> <style type="text/css"> form{ background-color:pink; width:500px; } </style> <title></title> </head> <body> <form action="${pageContext.request.contextPath }/first.do" method="post" enctype="multipart/form-data"> <h1>文件上传</h1> 文件1:<input type="file" name="uploadFile"/><br/> 文件2:<input type="file" name="uploadFile"/><br/> 文件3:<input type="file" name="uploadFile"/><br/> <input type="submit" value="上传"/> </form> </body> </html>
2.applicationContext.xml配置文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd "> <!-- 包扫描器 --> <context:component-scan base-package="cn.controller"></context:component-scan> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="50000000"></property> <property name="maxUploadSizePerFile" value="5000000"></property> <property name="defaultEncoding" value="utf-8"></property> </bean> <!--mvc注解驱动 包括:创建MultipartFile 实例 --> <mvc:annotation-driven/> </beans>
3.书写处理器
package cn.controller; import java.io.File; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; /** * * @author 景佩佩 * */ @Controller public class MyController{ //处理器方法 @RequestMapping(value="/first.do") //springmvc类型 /** * 将文件对象保存到文件(图片)服务器上 Nugux * * @param uploadFile 从页面上过来的真实文件对象 * @return * @throws Exception */ public String doFirst(@RequestParam MultipartFile[] uploadFile,HttpSession session) throws Exception{ for (MultipartFile item : uploadFile) { if (item.getSize()>0) { //通过文件后缀名判定只能让用户上传 .jpg .gif .png //所有文件上传 //1.xxx:获取文件名作为保存到服务器的文件名称 1.jpg String filename = item.getOriginalFilename(); if (filename.endsWith("jpg")||filename.endsWith("gif")||filename.endsWith("png")) { //2.前半部分路径,目录,将WebRoot下一个名称为images文件夹 转换成绝对路径 String leftPath = session.getServletContext().getRealPath("/images"); //3.进行路径拼接=前半部分路径+文件名称 File file=new File(leftPath,filename); item.transferTo(file); } }else { return "error.jsp"; } } return "welcome.jsp"; } }
提醒:在处理器方法中一定要对参数进行校对使用注解@RequestParam校正参数
要不然会报如下错误
之后就可以实现文件上传
index.jsp(我们先给定资源路径)
<%@ 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%>"> <style type="text/css"> form{ background-color:pink; width:500px; } </style> <title>单个文件上传</title> </head> <body> <form action="${pageContext.request.contextPath }/download.do" method="post" enctype="multipart/form-data"> <h1>文件下载</h1> <a href="${pageContext.request.contextPath }/download.do?1.jpg">下载</a> </form> </body> </html>
applicationContext.xml不用配置(与之前上传的一样)
处理器MyController
标签:efault lang app erp instance property type 页面 import
原文地址:http://www.cnblogs.com/jingpeipei/p/6270407.html