利用MultipartFile实现文件上传

在java中上传文件似乎总有点麻烦,没.net那么简单,记得最开始的时候用smartUpload实现文件上传,最近在工作中使用spring的MultipartFile实现文件上传,感觉挺简单,在这里和大家分享一下.

一.主要有两个java类,和一般的servlet放在一起即可.

1.FileUploadBean.java

package chb.demo.web;

import org.springframework.web.multipart.MultipartFile;

}

2.FileUploadController.java

package chb.demo.web;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

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

import org.springframework.validation.BindException;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;

二.配置文件中如下配置:

1.web.xml,利用spring mvc模式,大家应该都很熟悉了

    <servlet>
        <servlet-name>chb</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>chb</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

2.chb-servlet.xml,这里要配置映射,并可以设定最大可上传文件的大小

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    
    <bean id="methodNameResolver" class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
        <property name="paramName">
            <value>action</value>
        </property>
        <property name="defaultMethodName">
            <value>index</value>
        </property>
    </bean>

    <bean id="multipartResolver"  class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        
        <property name="maxUploadSize" value="10000000"/>
    </bean>


    <bean id="handlerMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
        <property name="mappings">
          <props>
            <prop key="/upload.do">fileUploadController</prop>
          </props>
        </property>
    </bean>

    <bean id="fileUploadController" class="chb.demo.web.FileUploadController">
        <property name="commandClass" value="chb.demo.web.FileUploadBean"/>
        
        <property name="formView" value="/user/err.jsp"/>
        
         <property name="successView" value="/user/confirmation.jsp"/>
   </bean>
</beans>

三.设定jsp页面

<form id="form1" method="post" action="upload.do" enctype="multipart/form-data">
    <tr>
        <td width="25%" align="right">上传文件：</td>
        <td><input id="file" type="file" NAME="file" style="width:300px;"></td>
    </tr>
    <tr align="center" valign="middle">
        <td height="60" colspan="2"><input type="submit" ID="BtnOK" value="确认上传"></td>
    </tr>
</form>

ok,现在就可以上传文件了,挺简单吧?这里我只列出了基本步骤,至于具体的操作(比如中文问题)可能就需要大家自己再完善完善了.