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详解spring mvc(注解)上传文件的简单例子

时间:2020-07-27 14:37     来源/作者:@ 小浩

spring mvc(注解)上传文件的简单例子。

这有几个需要注意的地方

1.form的enctype=”multipart/form-data” 这个是上传文件必须的

2.applicationContext.xml中 <bean id=”multipartResolver” class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”/> 关于文件上传的配置不能少

3、亲这两个jar包不能少哦,之前就是因为少了这个两个jar,一直报一些奇葩的错,给我累了个半死~(版本没什么要求)

commons-fileupload-1.2.2.jar

commons-io-2.0.1.jar 

大家可以看具体代码如下:

web.xml

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<?xml version="0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://wwwworg/2001/XMLSchema-instance" xmlns="http://javasuncom/xml/ns/javaee" xmlns:web="http://javasuncom/xml/ns/javaee/web-app_2_xsd" xsi:schemaLocation="http://javasuncom/xml/ns/javaee http://javasuncom/xml/ns/javaee/web-app_2_xsd" id="WebApp_ID" version="5">
 <display-name>webtest</display-name>
 
 <listener>
    <listener-class>orgspringframeworkwebcontextContextLoaderListener</listener-class>
  </listener>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
      /WEB-INF/config/applicationContextxml
      /WEB-INF/config/codeifActionxml
    </param-value>
  </context-param>
 
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>orgspringframeworkwebservletDispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/config/codeifActionxml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <!-- 拦截所有以do结尾的请求 -->
  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>*do</url-pattern>
  </servlet-mapping>
 
 <welcome-file-list>
  <welcome-file>indexdo</welcome-file>
 </welcome-file-list>
</web-app>

applicationContext.xml

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<?xml version="0" encoding="UTF-8"?>
<beans xmlns="http://wwwspringframeworkorg/schema/beans"
  xmlns:xsi="http://wwwworg/2001/XMLSchema-instance" xmlns:p="http://wwwspringframeworkorg/schema/p"
  xmlns:context="http://wwwspringframeworkorg/schema/context"
  xsi:schemaLocation="http://wwwspringframeworkorg/schema/beans http://wwwspringframeworkorg/schema/beans/spring-beans-xsd
  http://wwwspringframeworkorg/schema/context http://wwwspringframeworkorg/schema/context/spring-context-xsd"
  default-lazy-init="true">
 
  <!-- 启动Spring MVC的注解功能,完成请求和注解POJO的映射 -->
  <bean class="orgspringframeworkwebservletmvcannotationAnnotationMethodHandlerAdapter" lazy-init="false" />
 
  <!-- 另外最好还要加入DefaultAnnotationHandlerMapping,不然会被 XML或其它的映射覆盖! -->
  <bean class="orgspringframeworkwebservletmvcannotationDefaultAnnotationHandlerMapping" />
 
  <!-- 对模型视图名称的解析,即在模型视图名称添加前后缀 -->
  <bean class="orgspringframeworkwebservletviewInternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix="jsp" />
 
  <!-- 支持上传文件 -->
  <bean id="multipartResolver" class="orgspringframeworkwebmultipartcommonsCommonsMultipartResolver"/>
 
</beans>

codeifAction.xml

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<?xml version="0" encoding="UTF-8"?>
<beans xmlns="http://wwwspringframeworkorg/schema/beans"
  xmlns:xsi="http://wwwworg/2001/XMLSchema-instance" xmlns:context="http://wwwspringframeworkorg/schema/context"
  xsi:schemaLocation="http://wwwspringframeworkorg/schema/beans http://wwwspringframeworkorg/schema/beans/spring-beans-xsd
  http://wwwspringframeworkorg/schema/context http://wwwspringframeworkorg/schema/context/spring-context-xsd"
  default-lazy-init="true">
 
  <bean id="uploadAction" class="comcodeifactionUploadAction" />
 
</beans>

UploadAction.java

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package comcodeifaction;
 
import javaioFile;
import javautilDate;
 
import javaxservlethttpHttpServletRequest;
 
import orgspringframeworkstereotypeController;
import orgspringframeworkuiModelMap;
import orgspringframeworkwebbindannotationRequestMapping;
import orgspringframeworkwebbindannotationRequestParam;
import orgspringframeworkwebmultipartMultipartFile;
 
@Controller
public class UploadAction {
 
  @RequestMapping(value = "/uploaddo")
  public String upload(@RequestParam(value = "file", required = false) MultipartFile file, HttpServletRequest request, ModelMap model) {
 
    Systemoutprintln("开始");
    String path = requestgetSession()getServletContext()getRealPath("upload");
    String fileName = filegetOriginalFilename();
//    String fileName = new Date()getTime()+"jpg";
    Systemoutprintln(path);
    File targetFile = new File(path, fileName);
    if(!targetFileexists()){
      targetFilemkdirs();
    }
 
    //保存
    try {
      filetransferTo(targetFile);
    } catch (Exception e) {
      eprintStackTrace();
    }
    modeladdAttribute("fileUrl", requestgetContextPath()+"/upload/"+fileName);
 
    return "result";
  }
 
}

index.jsp

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<%@ page pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>上传图片</title>
</head>
<body>
<form action="uploaddo" method="post" enctype="multipart/form-data">
<input type="file" name="file" /> <input type="submit" value="Submit" /></form>
</body>
</html>

WEB-INF/jsp/下的result.jsp

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<%@ page pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>上传结果</title>
</head>
<body>
<img id="codetool">

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://www.cnblogs.com/xiohao/p/5273102.html

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