【Spring】SpringMVC之上传文件

这里笔者介绍利用SpringMVC上传图片的操作。

步骤

1. 引入jar文件

不仅需要导入开发SpringMVC相关的包，还需要导入 commons-fileupload-1.2.1.jar 和 commons-io-1.3.2.jar 包

2. 配置applicationContext.xml

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>

3. 编写html文件:

需要注意: 提交文件, 只能使用POST方式, 并且要指定enctype="multipart/form-data"
例如：

    <form action="file.do" method="POST" enctype="multipart/form-data">
        请选择您要上传的文件:<br><br>
        <input type="file" name="file"/><br>
        <input type="submit"/>
    </form>

4. 编写接收上传文件的Controller了 ,接收的文件的类型: MultipartFile

例如：

@RequestMapping("/file.do")
public String fileUpload(MultipartFile file){
    //上传的文件: file
    System.out.println("上传的文件名称为:"+file.getOriginalFilename());
    return "result";
}

Demo

下面是一个接受上传图片的Demo，该Demo能够把用户上传的图片存储到部署项目的根目录下面。那么如何查看自己项目的根目录：点击项目->.metadata->.plugins->org.eclipse.wst.server.core->tmp0->wtpwebapps ，在里面就可以看到部署的项目了。

jsp文件：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    文件上传成功:${imagePath }
</body>
</html>

fileUploadOk.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    文件过大, 请上传1M以内的图片
</body>
</html>

fileUploadError.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>上传错误</title>
</head>
<body>
请上传图片类型~ .jpg .png .jpeg
</body>
</html>

error.jsp

文件上传表单：

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>文件上传</title>
</head>
<body>
<form action="fileupload.do" method="POST" enctype="multipart/form-data">
<input type="file" name="file"/>
<input type="submit" value="提交"/>
</form>
</body>
</html>

fileUpload.jsp

dispatcherServlet-servlet.xml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:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

     <!--指定注解扫描包-->
     <context:component-scan base-package="cn"></context:component-scan>
     <!--开启注解扫描-->
     <mvc:annotation-driven/>
     
     <!--配置视图-->
  <bean id="viewResolver"    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass">
      <value>org.springframework.web.servlet.view.InternalResourceView</value>
    </property>
    <!--jsp存放的目录-->
    <property name="prefix">
      <value></value>
    </property>
    <!--jsp文件的后缀-->
    <property name="suffix">
      <value>.jsp</value>
    </property>
  </bean>
     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>
</beans>

dispatcherServlet-servlet.xml

web.xml文件：

<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <display-name>SpringMVC_FileUpLoad</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
  </welcome-file-list>
  <servlet>
      <servlet-name>dispatcherServlet</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  </servlet>
  <servlet-mapping>
      <servlet-name>dispatcherServlet</servlet-name>
      <url-pattern>*.do</url-pattern>
  </servlet-mapping>
</web-app>

web.xml

FileController.java控制器文件：

package cn.xdl.Controller;

import java.io.File;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class FileController {

    @RequestMapping("/fileupload.do")
    public String fileUpload(MultipartFile file,HttpServletResponse response,HttpServletRequest request){
        //判断文件的类型------------------//
        String fileName = file.getOriginalFilename();
        if(fileName.endsWith(".jpeg")||fileName.endsWith(".png")||fileName.endsWith(".jpg")){
        //判断文件的类型------------------//
            //上传的是图片
        //图片大小的判断---------------------//
            System.out.println("上传的图片的大小为: "+ file.getSize());
            int size = 1024*1024;
            //文件大小是否过大 , true表示过大
            boolean flag = false;
            if(file.getSize()<Integer.MAX_VALUE){
                int fileSize = (int) file.getSize();
                if(fileSize>size){
                    //文件过大
                    flag = true;
                }else{
                    //大小合适
                    flag = false;
                }
            }else{
                //文件大小过大
                flag = true;
            }
            //文件过大 则响应错误页面
            if(flag){
                //文件过大
                return "redirect:fileUploadError.jsp";
            }else{
                //文件大小正常 ,将文件存储到项目当前运行目录下
                String dirPath = request.getServletContext().getRealPath("/");//获取当前项目运行时的目录  // 获取到的目录: webContent目录
                System.out.println(dirPath);
                File imgDir = new File(dirPath+"/images");
                if(!imgDir.exists())
                    imgDir.mkdirs();
                try {
                    fileName = fileName.replace(".", ",");
                    String newFileName = System.currentTimeMillis()+"."+(fileName.split(",")[fileName.split(",").length-1]);
                    file.transferTo(new File(imgDir,newFileName ));
                    request.getSession().setAttribute("imagePath", "<a href='images/"+newFileName+"'>点击查看</a>");
                    return "redirect:fileUploadOk.jsp";
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }else{
            //上传的是其他文件
            System.out.println("上传的不是图片");
        }
        
        return "error";
    }
}

FileController.java

posted @ 2017-07-17 15:59 HDWK 阅读(331) 评论(0) 编辑收藏举报

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Take a look at GW

GW

Nothing is impossible,the world itself says "I'm possible"!
-- Audrey Hepburn

【Spring】SpringMVC之上传文件

步骤

1. 引入jar文件

2. 配置applicationContext.xml

3. 编写html文件:

4. 编写接收上传文件的Controller了 ,接收的文件的类型: MultipartFile

Demo

公告

Take a look at GW

GW

Nothing is impossible,the world itself says "I'm possible"! -- Audrey Hepburn

【Spring】SpringMVC之上传文件

步骤

1. 引入jar文件

2. 配置applicationContext.xml

3. 编写html文件:

4. 编写接收上传文件的Controller了 ,接收的文件的类型: MultipartFile

Demo

公告

Nothing is impossible,the world itself says "I'm possible"!
-- Audrey Hepburn