Spring4 MVC单文件上传-写法1
2018-03-04 本文已影响28人
养码哥
核心代码：
`package controller;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
@Controller
public class UserinfoController {
@RequestMapping(value = "upload")
public String loginMethod(MultipartHttpServletRequest request)
throws IOException {
String username = request.getParameter("username");
System.out.println("username=" + username);
MultipartFile file = request.getFile("uploadFile");
String uploadFileName = file.getOriginalFilename();
System.out.println("【文件名】" + uploadFileName);
InputStream fileStream = file.getInputStream();
String uploadPath = request.getSession().getServletContext()
.getRealPath("/upload");
File destination = new File(uploadPath, uploadFileName);
FileUtils.copyInputStreamToFile(fileStream, destination);
return "index.jsp";
}
}
`
index.jsp
`<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<form action="upload.spring" method="post" enctype="multipart/form-data">
username:<input type="text" name="username"><br />
要上传的文件:<input type="file" name="uploadFile"><br />
<input type="submit" value="开始上传"><br />
</form>
</html>`
springMVC配置详情：文件上传最大为2GB
`<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="2048000000" />
</bean>
`
如果不在xml中添加上面的配置会出现异常。如图
另外为了解决上传文件时单行文本域有乱码的问题，所以还需要在web.xml中声明编码过滤器，代码如下
` <filter>
<filter-name>encodefilter 过滤器名称</filter-name>
<filter-class> org.springframework.web.filter.CharacterEncodingFilter 过滤器的完全限定名</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodefilter 过滤器名称</filter-name>
<url-pattern>/* 需要过滤的页面地址</url-pattern>
</filter-mapping>`
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