Spring MVC ļϴ

SpringöԶ·ϴ֧֣רڴwebӦеļϴͨעһɲεMultipartResolveröļ·ϴ֧֡ýӿڶorg.springframework.web.multipart¡SpringΪһļϴṩMultipartResolverӿڵһʵ֣ΪServlet 3.0·תṩһʵ֡

Ĭ£SpringĶ·ϴ֧ǲģΪЩϣԼ·SpringĶ·ϴ֧֣ҪwebӦõһ·ÿ󣬽ǲһಿģ̱һ·עMultipartResolverᱻ֮еĶ·ϴԾһԴˡһ䷭Ĳãmultipartɶ·ǶಿֻСĶע˴

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Spring MVC ʹMultipartResolverCommons FileUploadļ

2018-07-26 14:28

ĴչʾʹһͨõĶ·ϴCommonsMultipartResolver

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

    <!-- ֵ֧һԣֵ֧ļСֽΪλ -->
    <property name="maxUploadSize" value="100000"/>

</bean>

ȻҪö·Ҫclasspath·׼jarʹõͨõĶ·ϴCommonsMultipartResolverҪjarcommons-fileupload.jar

SpringDispatcherServlet⵽һಿʱἤĶ·󽻸ѵǰHttpServletRequestװһֶ֧·ļϴMultipartHttpServletRequest``MultipartHttpServletRequest㲻Իȡö·еϢĿлøö·ݱ

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Spring MVC Servlet 3.0µMultipartResolver

2018-07-26 14:29

ҪʹûServlet 3.0Ķ·תܣweb.xmlΪDispatcherServletһmultipart-configԪأͨServlet̵ķʹjavax.servlet.MultipartConfigElementעᣬԼԼServlet࣬ʹjavax.servlet.annotation.MultipartConfigע⡣ļС洢λõѡServletעᣬΪServlet 3.0ڽMultipartResolverĲ㼶ЩϢ

ͨһַʽServlet 3.0·תܣͿ԰һStandardServletMultipartResolverӵSpringȥˣ

<bean id="multipartResolver" class="org.springframework.web.multipart.support.StandardServletMultipartResolver">
</bean>

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Spring MVC еļϴ

2018-07-26 14:30

MultipartResolverɴʱһ̴ȣһļϴıֱϴԣenctype="multipart/form-data"֪ζԶ·ϴıб루encode

<html>
    <head>
        <title>Upload a file please</title>
    </head>
    <body>
        <h1>Please upload a file</h1>
        <form method="post" action="/form" enctype="multipart/form-data">
            
            
            
        </form>
    </body>
</html>

һǴһܴļϴĿҪĿһע@ControllerĿһܵķMultipartHttpServletRequest``MultipartFile

@Controller
public class FileUploadController {

    @RequestMapping(path = "/form", method = RequestMethod.POST)
    public String handleFormUpload(@RequestParam("name") String name, @RequestParam("file") MultipartFile file) {

        if (!file.isEmpty()) {
            byte[] bytes = file.getBytes();
            // store the bytes somewhere
            return "redirect:uploadSuccess";
        }

        return "redirect:uploadFailure";
    }

}

@RequestParamעνӦеĶֶεġУõbyte[]ļݣֻûκ¡ʵӦУܻὫ浽ݿ⡢洢ļϵͳϣĴ

ʹServlet 3.0Ķ·תʱҲʹjavax.servlet.http.PartΪ

@Controller
public class FileUploadController {

    @RequestMapping(path = "/form", method = RequestMethod.POST)
    public String handleFormUpload(@RequestParam("name") String name, @RequestParam("file") Part file) {

        InputStream inputStream = file.getInputStream();
        // store bytes from uploaded file somewhere

        return "redirect:uploadSuccess";
    }

}

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Spring MVC ͻ˷ļϴ

2018-07-26 14:30

ʹRESTfulĳ£ĿͻҲֱύ·ļһڽҲͬáͬǣύļͼ򵥵ıֶΣͻ˷͵ݿԸӸӣݿָΪĳضͣcontent type磬һ·ϴܵһǸļڶǸJSONʽݣ

    POST /someUrl
    Content-Type: multipart/mixed

    --edt7Tfrdusa7r3lNQc79vXuhIIMlatb7PQg7Vp
    Content-Disposition: form-data; name="meta-data"
    Content-Type: application/json; charset=UTF-8
    Content-Transfer-Encoding: 8bit

    {
        "name": "value"
    }
    --edt7Tfrdusa7r3lNQc79vXuhIIMlatb7PQg7Vp
    Content-Disposition: form-data; name="file-data"; filename="file.properties"
    Content-Type: text/xml
    Content-Transfer-Encoding: 8bit
    ... File Data ...

Ϊmeta-dataĲ֣ͨϵ@RequestParam("meta-data") String metadataáǲΪJSONʽݵܸͨһӦǿͶ󣬾@RequestBodyͨHttpMessageConverterһתһһ

ǿܵģʹ@RequestPartעʵ֣@RequestParamע⽫ʹض·屻HttpMessageConverterתʱǶ·вͬͲ'Content-Type'

@RequestMapping(path = "/someUrl", method = RequestMethod.POST)
public String onSubmit(@RequestPart("meta-data") MetaData metadata, @RequestPart("file-data") MultipartFile file) {

    // ...

}

עMultipartFileܹ@RequestParam``@RequestPartע»õģַõݡķ@RequestPart("meta-data") MetaDataΪеͷ'Content-Type'ΪJSONݣȻͨMappingJackson2HttpMessageConverterתضĶ

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