• spring mvc(注解)上传文件的简单例子 (转-收藏)


     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

    大家可以看具体代码如下:

    web.xml

    <?xml version="1.0" encoding="UTF-8"?>  
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">  
      <display-name>webtest</display-name>  
      
      <listener>  
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
        </listener>  
        <context-param>  
            <param-name>contextConfigLocation</param-name>  
            <param-value>  
                /WEB-INF/config/applicationContext.xml  
                /WEB-INF/config/codeifAction.xml  
            </param-value>  
        </context-param>  
      
        <servlet>  
            <servlet-name>dispatcherServlet</servlet-name>  
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
            <init-param>  
                <param-name>contextConfigLocation</param-name>  
                <param-value>/WEB-INF/config/codeifAction.xml</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>index.do</welcome-file>  
      </welcome-file-list>  
    </web-app> 

    applicationContext.xml

    <?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:p="http://www.springframework.org/schema/p"  
        xmlns:context="http://www.springframework.org/schema/context"  
        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"  
        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="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" 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="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />  
      
        <!-- 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="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />  
      
        <!-- 支持上传文件 -->  
        <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>  
      
    </beans>

      UploadAction.java

    package com.codeif.action;  
      
    import java.io.File;  
    import java.util.Date;  
    import javax.servlet.http.HttpServletRequest;  
    import org.springframework.stereotype.Controller;  
    import org.springframework.ui.ModelMap;  
    import org.springframework.web.bind.annotation.RequestMapping;  
    import org.springframework.web.bind.annotation.RequestParam;  
    import org.springframework.web.multipart.MultipartFile;  
      
    @Controller  
    public class UploadAction {  
        @RequestMapping(value = "/upload.do")  
        public String upload(@RequestParam(value = "file", required = false) MultipartFile file, HttpServletRequest request, ModelMap model) {  
            System.out.println("开始");  
            String path = request.getSession().getServletContext().getRealPath("upload");  
            String fileName = file.getOriginalFilename();  
    //        String fileName = new Date().getTime()+".jpg";  
            System.out.println(path);  
            File targetFile = new File(path, fileName);  
            if(!targetFile.exists()){  
                targetFile.mkdirs();  
            }  
            //保存  
            try {  
                file.transferTo(targetFile);  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
            model.addAttribute("fileUrl", request.getContextPath()+"/upload/"+fileName);  
            return "result";  
        }  
    } 

    index.jsp

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

    WEB-INF/jsp/下的result.jsp

    <%@ page pageEncoding="utf-8"%>  
    <!DOCTYPE html>  
    <html>  
    <head>  
    <meta charset="utf-8">  
    <title>上传结果</title>  
    </head>  
    <body>  
    <img alt="" src="${fileUrl }" />  
    </body>  
    </html> 
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  • 原文地址:https://www.cnblogs.com/yang218/p/6196707.html
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