花了三天三夜的时间终于研究出来了
原文：使用 MultipartFile 实现图片上传功能
前端：
<%@ page language=\"java\" contentType=\"text/html; charset=UTF-8\" pageEncoding=\"UTF-8\" %>
<!DOCTYPE html>
<html>
<head>
< >文件上传demo</ >
< src=\"http://layui.hcwl520.com.cn/layui/layui.js?v=201809030202\"></ >
< rel=\"stylesheet\" href=\"http://layui.hcwl520.com.cn/layui/css/layui.css?v=201809030202\"/>
</head>
<body>
<fieldset class=\"layui-elem-field layui-field- \" style=\"margin-top: 30px;\">
<legend>常规使用：普通图片上传</legend>
</fieldset>
<div class=\"layui-upload\">
<button type=\"button\" class=\"layui-btn\" id=\"test1\">上传图片</button>
<div class=\"layui-upload-list\">
<img class=\"layui-upload-img\" id=\"demo1\">
<p id=\"demoText\"></p>
</div>
</div>
</body>
< >
layui.use([\'form\',\'upload\'],function(exports) {
var form = layui.form;
var $ = layui.jquery;
var upload = layui.upload;
upload.render({
elem: \'#test1\'
,url: \'/load/upload\'
,before: function(obj){
//预读本地文件示例，不支持ie8
obj.preview(function(index, file, result){
$(\'#demo1\').attr(\'src\', result); //图片链接（ 64）
});
}
,done: function(res){
//如果上传失败
if(res.code > 0){
return .msg(\'上传失败\');
}
//上传成功
}
});
});
</ >
</html>
后端：
package com.demo;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Calendar;
import java.util.UUID;
import org.apache.commons.io.IOUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSON ;
import org.spring work.stereotype.Controller;
import org.spring work.web.bind.annotation.RequestMapping;
import org.spring work.web.bind.annotation.RequestParam;
import org.spring work.web.bind.annotation.ResponseBody;
import org.spring work.web.multipart.MultipartFile;
@Controller
public class Load {
@RequestMapping(value = \"/upload\")
@ResponseBody
public String upload( MultipartFile file, HttpServletRequest request) {
//System.out.println(\"file\"+file);
Calendar currTime = Calendar.getInstance();
String time = String.valueOf(currTime.get(Calendar.YEAR))+String.valueOf((currTime.get(Calendar.MONTH)+1));
String path =\"d:\"+File.separator+\"img\"+File.separator+time;
String suffix = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf(\".\"));
suffix = suffix.toLowerCase();
if(suffix.equals(\".jpg\") || suffix.equals(\".jpeg\") || suffix.equals(\".png\") || suffix.equals(\".gif\")){
String fileName = UUID.randomUUID().toString()+suffix;
File targetFile = new File(path, fileName);
if(!targetFile.getParentFile().exists()){//注意，判断父级路径是否存在
targetFile.getParentFile().mkdirs();
}
long size = 0;
//保存
try {
file.transferTo(targetFile);
size = file.getSize();
} catch (Exception e) {
e.printStackTrace();
}
JSON result = new JSON ();
result.put(\"fileUrl\", \"/img/\"+time+fileName);
result.put(\"url\", \"/img/\"+time+fileName);
result.put(\"state\", \"SUCCESS\");
result.put(\" \", fileName);
result.put(\"original\", fileName);
result.put(\"type\", suffix);
result.put(\"size\", size);
return result.toString();
}else{
JSON result = new JSON ();
result.put(\"ss\", false);
result.put(\"msg\", \"格式不支持\");
return result.toString();
}
}
}
spring-mvc- :
<? version=\"1.0\" encoding=\"UTF-8\"?>
<beans ns:xsi=\"http://www.w3.org/2001/ Schema-instance\"
ns=\"http://www.spring work.org/schema/beans\"
ns:p=\"http://www.spring work.org/schema/p\"
ns:context=\"http://www.spring work.org/schema/context\"
xsi:schemaLocation=\"http://www.spring work.org/schema/beans
http://www.spring work.org/schema/beans/spring-beans-4.3.xsd
http://www.spring work.org/schema/context
http://www.spring work.org/schema/context/spring-context-4.3.xsd\">
<!-- 自动扫描加载注解的包 -->
<context:component-scan -package=\"com.demo\"/>
<bean name=\"multipartResolver\"
class=\"org.spring work.web.multipart.commons.CommonsMultipartResolver\">
<property name=\"defaultEncoding\" value=\"UTF-8\"></property>
<property name=\"maxUploadSize\" value=\"5834689\" />
</bean>
<bean id=\"viewResolver\" class=\"org.spring work.web.servlet.view.InternalResourceViewResolver\">
<property name=\"prefix\" value=\"/WEB-INF/view/\"></property>
<property name=\"suffix\" value=\".jsp\" ></property>
</bean>
</beans>
controller:
package com.demo;
import org.spring work.stereotype.Controller;
import org.spring work.ui.Model;
import org.spring work.web.bind.annotation.RequestMapping;
@Controller
public class Testhello{
@RequestMapping(\"/hello\") //对应于index.jsp的hello请求
public String hello(Model model) {
model.addAttribute(\"message\", \"我是springmvc\");
return \"hello\"; //返回到view的hello.jsp
// TODO Auto-generated method stub
}
}
web. :
<? version=\"1.0\" encoding=\"UTF-8\"?>
<web-app version=\"3.0\"
ns=\"http://java.sun.com/ /ns/javaee\"
ns:xsi=\"http://www.w3.org/2001/ Schema-instance\"
xsi:schemaLocation=\"http://java.sun.com/ /ns/javaee
http://java.sun.com/ /ns/javaee/web-app_3_0.xsd\">
<display-name>springmvc01</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>springDispatcherServlet</servlet-name>
<servlet-class>org.spring work.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc. </param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>springDispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
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