使用SpringMVC接收文件流上傳和表單參數

/**
 * 接收文件流
 *
 * @param request 請求
 * @return OK
 */
@RequestMapping(value = "/receive/file", method = POST)
public String receiveFile(HttpServletRequest request) {
    // 轉換為 MultipartHttpServletRequest
    if (request instanceof MultipartHttpServletRequest) {
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
        // 通過表單中的參數名來接收文件流（可用 file.getInputStream() 來接收輸入流）
        MultipartFile file = multipartRequest.getFile("file");
        System.out.println("上傳的文件名稱:" + file.getOriginalFilename());
        System.out.println("上傳的文件大小:" + file.getSize());
        // 接收其他表單參數
        String name = multipartRequest.getParameter("name");
        String content = multipartRequest.getParameter("content");
        System.out.println("name:" + name);
        System.out.println("content:" + content);
        return "OK";
    } else {
        return "不是 MultipartHttpServletRequest";
    }
}

<form action="http://127.0.0.1:8080/receive/file" method="post" enctype="multipart/form-data">
    <input type="file" name="file" id="file">
    <input type="text" name="content" value="內容">
    <input type="text" name="name" value="名稱">
    <button type="submit">提交請求</button>
</form>

<?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"/>
    <!-- if you use annotation you must configure following setting -->
    <mvc:annotation-driven/>
    <bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"/>
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>
    <!-- 處理JSON -->
    <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <value>text/html;charset=UTF-8</value>
            </list>
        </property>
    </bean>
    <mvc:default-servlet-handler/>
    <!-- 日志輸出攔截器 -->
    <mvc:interceptors>
        <bean class="com.steward.interceptor.AccessInteceptor">
            <property name="accessLog">
                <value>true</value>
            </property>
        </bean>
    </mvc:interceptors>
    <!-- 解析器 -->
    <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
        <property name="mediaTypes">
            <map>
                <entry key="html" value="text/html"/>
                <entry key="json" value="application/json"/>
            </map>
        </property>
        <property name="viewResolvers">
            <list>
                <ref bean="viewResolver"/>
            </list>
        </property>
        <property name="defaultViews">
            <list>
                <bean class="org.springframework.web.servlet.view.json.MappingJackson2JsonView"/>
            </list>
        </property>
    </bean>
    <!-- 異常處理 -->
    <bean id="exceptionHandler" class="com.steward.exception.ExceptionHandler"/>
    <!-- 文件上傳 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
    <!-- 配置freeMarker的模板路徑 -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.freemarker.FreeMarkerView"></property>
        <property name="suffix" value=".html"></property>
        <property name="contentType" value="text/html;charset=UTF-8"/>
        <property name="requestContextAttribute" value="rc"></property>
    </bean>
    <bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
        <property name="templateLoaderPath" value="/WEB-INF/templates/"></property>
        <property name="freemarkerSettings">
            <props>
                <prop key="template_update_delay">0</prop>
                <prop key="default_encoding">UTF-8</prop>
                <prop key="locale">zh_CN</prop>
                <prop key="number_format">0.##########</prop>
                <prop key="template_exception_handler">ignore</prop>
            </props>
        </property>
        <property name="freemarkerVariables">
            <map>
                <entry key="getVersion" value-ref="getVersion"/>
            </map>
        </property>
    </bean>
    <bean id="getVersion" class="com.steward.freemarker.GetVersion"/>
</beans>

@RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
@ResponseBody
public String uploadFile(HttpServletRequest request) throws Exception {
    FileOutputStream fos = null;
    InputStream in = null;
    String fileUrl = null;
    try {
        //將當前上下文初始化給  CommonsMutipartResolver （多部分解析器）
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
        //檢查form中是否有enctype="multipart/form-data"
        if (multipartResolver.isMultipart(request)) {
            //將request變成多部分request
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
            //獲取multiRequest 中所有的文件名
            Iterator iterator = multiRequest.getFileNames();
            while (iterator.hasNext()) {
                MultipartFile multipartFile = multiRequest.getFile(iterator.next().toString());
                in = multipartFile.getInputStream();
                File file = new File(multipartFile.getOriginalFilename());
                fos = new FileOutputStream(file);
                byte[] buff = new byte[1024];
                int len = 0;
                while ((len = in.read(buff)) > 0) {
                    fos.write(buff, 0, len);
                }
                String uploadUrl = platformHttpsDomain + "/uploadFile";
                HttpPost post = new HttpPost(uploadUrl);
                HttpClient httpclient = new DefaultHttpClient();
                MultipartEntity reqEntity = new MultipartEntity();
                reqEntity.addPart("file", new FileBody(file));
                post.setEntity(reqEntity);
                HttpResponse response = httpclient.execute(post);
                int statusCode = response.getStatusLine().getStatusCode();
                if (statusCode == HttpStatus.SC_OK) {
                    fileUrl = EntityUtils.toString(response.getEntity());
                }
                file.deleteOnExit();
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (fos != null) {
            try {
                fos.close();
            } catch (IOException e) {
            }
        }
        if (in != null) {
            try {
                in.close();
            } catch (IOException e) {
            }
        }
    }
    return fileUrl;
}