SpringMVC上传文件的两种方法
时间：2020-11-01 13:50:27 | 栏目：JAVA代码 | 点击：次
在该示例中，阐述了SpringMVC如何上传文件。
1、上传页面upload.jsp
<body>
<form action="/TestSpringMVC3/data/uploadfile" enctype="multipart/form-data" method="post">
file:<input type="file" name="file"><br>
<input type="submit" value="upload file">
</form>
</body>
2、controller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:mvc="http://www.springframework.org/schema/mvc"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!--
使Spring支持自动检测组件，如注解的Controller
-->
<context:component-scan base-package="cn.com.yy.controller"/>
<!-- 开启注解配置 -->
<mvc:annotation-driven/>
<!-- 支持JSP JSTL的解析器 -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/page/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!-- 配置文件上传解析器 -->
<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>
</beans>
主要是添加了文件上传的解析器，配置了默认编码，最大的上传大小以及缓存大小等参数。
3、Controller
package cn.com.yy.controller;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
@Controller
@RequestMapping("/data")
public class FileUploadController {
/**
* method1:通过参数CommonsMultipartFile进行解析
* @RequestParam("file")中的file对应于upload.jsp中的file类型的name对应的名称
* @param file
* @return
* @throws IOException
*/
@RequestMapping(value="/uploadfile")
public String upload1(@RequestParam("file") CommonsMultipartFile file) throws IOException{
//获取文件名称
String fileName = file.getOriginalFilename();
//写入本地磁盘
InputStream is = file.getInputStream();
byte[] bs = new byte[1024];
int len;
OutputStream os = new FileOutputStream(new File("D:/temp/" + fileName));
while ((len = is.read(bs)) != -1) {
os.write(bs, 0, len);
}
os.close();
is.close();
return "upload_success";
}
@RequestMapping("/upload")
public String toPage(){
return "upload";
}
}
4、返回页面upload_success.jsp
<body> upload file success!! </body>
5、测试
访问 http://localhost:8080/TestSpringMVC3/data/upload 跳转到上传页面
选择文件上传
点击上传会跳转到上传成功页面。
上述方法只是简单的讲解了SpringMVC如何上传文件。
第二种方法：使用SpringMVC封装的方法进行文件上传
/**
* 使用SpringMVC封装好的方法进行文件上传
* @param request
* @param response
* @throws IllegalStateException
* @throws IOException
*/
@RequestMapping("/uploadfile2")
public void upload2(HttpServletRequest request,HttpServletResponse response) throws IllegalStateException, IOException{
//获取解析器
CommonsMultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext());
//判断是否是文件
if(resolver.isMultipart(request)){
//进行转换
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)(request);
//获取所有文件名称
Iterator<String> it = multiRequest.getFileNames();
while(it.hasNext()){
//根据文件名称取文件
MultipartFile file = multiRequest.getFile(it.next());
String fileName = file.getOriginalFilename();
String localPath = "D:/temp/" + fileName;
File newFile = new File(localPath);
//上传的文件写入到指定的文件中
file.transferTo(newFile);
}
}
}
该方法上传文件效率更优。