SpringMVC上传文件的两种方法

  • Z时代
  • 2024-01-10
  • 分类：IT

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。

以上是 SpringMVC上传文件的两种方法 的全部内容， 来源链接： utcz.com/p/214915.html

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