|
springmvc+ajax异步上传图片
1、javaweb传统的上传图片方式就是通过form表单提交
<form action="#" method="post" enctype="multipart/form-data">
<input type="file" name="file">
<input type="submit" value="上传">
</form> |
2、现在想要实现:点击文件表单的"浏览"按鈕后,文件异步上传,然后返回文件的路径,页面实时刷新显示刚才上传的图片。
2.1、新建一个springboot项目picDemo
pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies> |
application.properties
server.port=8090
server.servlet.context-path=/ |
2.2、要实现图片异步上传,可以使用jquery.form.js插件。
save.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>标题</title>
<script type="text/javascript" th:src="@{/js/jquery.js}"></script>
<script type="text/javascript" th:src="@{/js/jquery.form.js}"></script>
<style type="text/css">
.hidden {
display:none;
}
</style>
</head>
<body>
<div id="film_save">
<form id="form" action="#" th:action="@{/film/save}" method="post" th:object="${film}" enctype="multipart/form-data">
<input type="hidden" name="id" th:value="*{id}"/>
<table class="table">
<tr>
<td>电影名称:</td>
<td><input type="text" name="name" th:value="*{name}"/></td>
</tr>
<tr>
<td>电影图片:</td>
<td><input type="file" name="file" id="file" onchange="fileUpload()"/></td>
</tr>
<tr>
<td><input type="hidden" id="imageUrl" name="imageUrl" value=""/></td>
<td><img id="imgSrc" th:class="${film.imageUrl eq null or film.imageUrl eq ''}?hidden:''" th:src="'http://localhost:8080/image/' + ${film.imageUrl}" style="width:200px;"/></td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="保存"/></td>
</tr>
</table>
</form>
<script type="text/javascript">
function fileUpload() {
var option = {
type:'POST',
url:'/film/uploadPic',
dataType:'json',
data:{
fileName : 'file'
},
success:function(data){
//把json串转换成json对象
//var jsonObj = $.parseJSON(data);
//alert(data);
//返回服务器图片路径,把图片路径设置给img标签
$("#imgSrc").attr("src",data.fullPath);
// 显示图片
$("#imgSrc").removeClass("hidden");
//数据库保存相对路径
$("#imageUrl").val(data.relativePath);
//alert($("#imageUrl").val());
}
};
$("#form").ajaxSubmit(option);
}
</script>
</div>
</body>
</html> |
2.3、后端代码
IndexController
package com.oy;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
@Controller
public class IndexController {
@RequestMapping("/save")
public Object save(Film film) {
return "save";
}
@RequestMapping("/film/uploadPic")
@ResponseBody
public Object uploadPic(MultipartFile file) throws Exception {
String oldName = file.getOriginalFilename();
String newName = UUID.randomUUID().toString().replace("-", "").toUpperCase()
+ "_" + oldName;
System.out.println("上传的图片的newName: " + newName);
File base = new File("d:/image/filmImage/");
if (! base.exists()) {
base.mkdirs();
}
// 保存文件
file.transferTo(new File("d:/image/filmImage/" + newName));
// 封装返回结果
Map<String, Object> map = new HashMap<>();
map.put("fullPath", "http://localhost:8090/image/" + newName);
map.put("relativePath", newName);
return map;
}
} |
Film类:
public class Film {
private Integer id; // 编号
private String name; // 电影名称
private String imageUrl; // 电影图片
// getter和setter方法省略
} |
图片上传后,java返回的json数据为:
{
"fullPath": "http://localhost:8090/image/E29C543179AD4B69B521EB542D9E735E_无标题.png",
"relativePath": "E29C543179AD4B69B521EB542D9E735E_无标题.png"
} |
其中,fullPath为图片全路径。要实现图片上传后,图片刷新显示,还要再springboot中配置图片保存目录的路径映射:
WebConfigurer类
package com.oy;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class WebConfigurer implements WebMvcConfigurer {
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/image/**").addResourceLocations("file:D:/image/filmImage/");
}
} |
3、其他
3.1、上面的demo是将图片保存目录的路径进行了映射。图片url与demo是在同一个域,都是http://localhost:8090,其实图片可以配置成其他的,比如http://localhost:8091,然后用外置的tomcat(非springboot内置)或nginx配置映射。
3.2、将图片上传至图片服务器(分布式文件系统)
程序猿的技术大观园:www.javathinker.net
|
|