springmvc的文件的上传
在新建项目之前导入样式和jsp页面:
1.把样式的文件夹放在web下面
2.把jsp页面放在web/WEB-INF下面
项目中需要导入的jar包
1.首先配置web.xml文件:
在这里插入<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
<!--配置文件上传的初始化信息-->
<multipart-config>
<location>D:/yangyang</location><!--临时上传目录-->
<max-file-size>5242880</max-file-size><!--5MB--><!--上传文件的大小-->
<max-request-size>20971520</max-request-size><!--20MB--><!--请求含有的mulipart数据的大小-->
<file-size-threshold>0</file-size-threshold><!--写入数据的阈值-->
</multipart-config>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>代码片
2.配置dispatcher-servlet.xml文件
在这里<?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:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="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.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<context:component-scan base-package="com.java12.demo"></context:component-scan>
<mvc:annotation-driven></mvc:annotation-driven>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<!--处理具体目录下的静态资源-->
<mvc:resources mapping="/static/**" location="/static/"></mvc:resources>
<!--配置multpart的处理器 在servlet3.0以上的容器中运行 不依赖与其他的jar包项目-->
<bean id="multipartResolver" class="org.springframework.web.multipart.support.StandardServletMultipartResolver"></bean>
<!--
when an ApplicationContext is loaded,
当ApplicationContext被加载的时候
it automatically searches for a MessageSource bean defined in the cintext
它会自动寻找在上下文中定义的一个MessageSource bean
The bean must have the name messageSource
这个bean的名字必须是messageSource-->
<!--配置国际化资源-->
<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basename" value="messages"></property>
<property name="defaultEncoding" value="UTF-8"></property>
</bean>
</beans>插入代码片
3.写一个实体类FileBucket(用于创建包含MultiparFile的文件对象)
在这里插入代public class FileBucket {
private MultipartFile file;
public MultipartFile getFile(){
return file;
}
public void setFile(MultipartFile file){
this.file=file;
}
}码片
4.写已给验证器的类FileValidator.java
在这里插入import com.java12.demo.entity.FileBucket;
import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
import org.springframework.web.multipart.MultipartFile;
@Component
public class FileValidator implements Validator {
@Override
public boolean supports(Class<?> aClass) {
return true;
}
/*Error用于存放错误信息*/
@Override
public void validate(Object o, Errors errors) {
FileBucket file= (FileBucket) o;
MultipartFile multipartFile = file.getFile();
if(multipartFile!=null){
if(multipartFile.getSize()==0){
/*放置错误信息 用于前台<form:error>信息展示*/
errors.rejectValue("file","missing.file");
}
}
}
}代码片
5.控制器类FileUploadController.java
在这里插入代package com.java12.demo.controller;
import com.java12.demo.entity.FileBucket;
import com.java12.demo.validator.FileValidator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.util.FileCopyUtils;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.validation.Valid;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
@Controller
public class FileUploadController {
private static String UPLOAD_LOCATION="D:/myyangyang/";
@Autowired
private FileValidator fileValidator;
/*添加文件的验证器*/
@InitBinder
public void initSingleFileValidator(WebDataBinder webDataBinder){
webDataBinder.addValidators(fileValidator);
}
@RequestMapping(value = {"/","welcome"})
public String welcome(){
return "welcome";
}
/*
* 渲染springmvc的表单
* 1.首先form表单中得使用modelAttribute 从request作用域中取出域对象
* 2.在跳转form表单中的处理方法中往request作用域中添加域对象
* 3.该域对象中的属性必须得与form表单中path属性一一对应
* */
@GetMapping(value = "singleUpload")
public String singleUpload(Model model){
FileBucket fileBucket = new FileBucket();
model.addAttribute("fileBucket",fileBucket);
return "singleFileUploader";
}
/*
* singleFileUploader页面是由welcome.jsp中的get方法请求连接singleUpload发送过来的
* 所以表单在为有什么action的前提下,还是会返回到原来的请求中去即singleUpload只是请求方式改为post方式了
* */
/*此处是从Errors接口中的子类即BindingResult中取出在验证器存放的错误信息*/
@PostMapping("singleUpload")
public String singleFileUpload(@Valid FileBucket fileBucket, BindingResult result, Model model) throws IOException {
if(result.hasErrors()){
System.out.println("validation errors");
return "singleFileUploader";
}else {
System.out.println("Fetching file");
MultipartFile file = fileBucket.getFile();
String name = file.getName();
System.out.println("输入的文件名为:"+name);
String filename1 = file.getOriginalFilename();
System.out.println("输入文件的原始文件名"+filename1);
String contentType = file.getContentType();
System.out.println("文件类型:"+contentType);
String s = new String(file.getBytes());
System.out.println(s);
MultipartFile multipartFile = fileBucket.getFile();
FileCopyUtils.copy(fileBucket.getFile().getBytes(), new File(UPLOAD_LOCATION + fileBucket.getFile().getOriginalFilename()));
String filename = multipartFile.getOriginalFilename();
model.addAttribute("fileName",filename);
return "success";
}
}
}
码片