springmvc上传下载

（1）form表单的enctype取值是：multipart/form-data，method取值是：post，提供一个文件选择域

（2）springmvc方式

• 做表单

<h3>springmvc文件上传方式</h3>
<form action="user/fileUpload2" method="post" enctype="multipart/form-data">
    选择文件<input type="file" name="upload"/><br>
    <input type="submit" value="上传">
</form>  

• 配解析器

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="maxUploadSize" value="10485760"/>
</bean>  

id="multipartResolver"，id的名字必须是这个名字：multipartResolver

• 
  public String fileUpload2(HttpServletRequest request, MultipartFile upload)  

MultipartFile upload的参数名必须与表单<input type="file" name="upload"/>name的名字一致

（3）跨服务器传文件

• 启动两个tomcat，是两个真实的tomcat服务器
• 导包

<dependency>
  <groupId>com.sun.jersey</groupId>
  <artifactId>jersey-core</artifactId>
  <version>1.18.1</version>
</dependency>

<dependency>
  <groupId>com.sun.jersey</groupId>
  <artifactId>jersey-client</artifactId>
  <version>1.18.1</version>
</dependency>  

• 编程

@RequestMapping("/fileUpload3")
public String fileUpload3(MultipartFile upload) throws Exception {
    System.out.println("跨服务器springmvc文件上传。。。。。");

    String path = "http://localhost:9090/fileuploadserver/uploads";

    //说明是上传文件项，获取上传文件的名称
    String filename = upload.getOriginalFilename();

    //文件名称设置成UUID
    String uuid = UUID.randomUUID().toString().replace("-", "");

    filename = uuid + "_" + filename;

    Client client = Client.create();

    WebResource webResource = client.resource(path +"/" + filename);

    webResource.put(upload.getBytes());

    return "success";
}  

• 启动两个服务器

SpringMVC跨服务器传输文件出现400错误解决

答案很简单 ，接收文件的另一个服务器不支持中文，也就是说文件名不能写中文否则就会报400错误。

解决方案无非就是两种，让文件服务器支持utf-8编码或者将文件名变成英文。

SpringMVC跨服务器传输文件：returned a response status of 405 Method Not Allowed

在你的Tomact服务器安装目录下的conf/web.xml配置文件中加上：

<init-param>

<param-name>readonly</param-name>

<param-value>false</param-value>

</init-param>

<servlet>

<servlet-name>default</servlet-name>

<servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>

<init-param>

<param-name>debug</param-name>

<param-value>0</param-value>

</init-param>

<init-param>

<param-name>listings</param-name>

<param-value>false</param-value>

</init-param>

<init-param>

<param-name>readonly</param-name>

<param-value>false</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>