1、创建一个文件服务器
1.1、创建一个空的web项目，在webapp下创建uploads目录用于存放文件
1.2、启动tomcat服务器，充当文件服务器
2、上传文件的web应用服务器
2.1、maven依赖
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.ly.mvc</groupId> <artifactId>springmvc03</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <name>springmvc03 Maven Webapp</name> <!-- FIXME change it to the project's website --> <url>http://www.example.com</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>13</maven.compiler.source> <maven.compiler.target>13</maven.compiler.target> <!--锁定spring版本--> <spring.version>5.0.2.RELEASE</spring.version> </properties> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.0.1</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.0</version> <scope>provided</scope> </dependency> <!--文件上传，依赖commons-io--> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency> <!--用于跨服务器上传文件--> <dependency> <groupId>com.sun.jersey</groupId> <artifactId>jersey-core</artifactId> <version>1.18.1</version> </dependency> <dependency> <groupId>com.sun.jersey</groupId> <artifactId>jersey-client</artifactId> <version>1.18.1</version> </dependency> </dependencies> <build> <finalName>springmvc03</finalName> <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) --> <plugins> <plugin> <artifactId>maven-clean-plugin</artifactId> <version>3.1.0</version> </plugin> <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging --> <plugin> <artifactId>maven-resources-plugin</artifactId> <version>3.0.2</version> </plugin> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.0</version> <!--解决IDEA maven变更后自动重置LanguageLevel和JavaCompiler版本的问题--> <configuration> <source>${maven.compiler.source}</source> <target>${maven.compiler.target}</target> </configuration> </plugin> <plugin> <artifactId>maven-surefire-plugin</artifactId> <version>2.22.1</version> </plugin> <plugin> <artifactId>maven-war-plugin</artifactId> <version>3.2.2</version> </plugin> <plugin> <artifactId>maven-install-plugin</artifactId> <version>2.5.2</version> </plugin> <plugin> <artifactId>maven-deploy-plugin</artifactId> <version>2.8.2</version> </plugin> </plugins> </pluginManagement> </build> </project>
2.2、文件上传页面
<%-- Created by IntelliJ IDEA. User: Administrator Date: 2020/2/28 Time: 16:00 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <%--文件上传时method必须是post、enctype必须是multipart/form-data--%> <form action="upload" method="post" enctype="multipart/form-data"> <input type="file" name="upload"/><br> <input type="submit" value="提交"/> </form> </body> </html>
2.3、springmvc.xml
<?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"> <!--配置注解扫描的包--> <context:component-scan base-package="com.ly.mvc"/> <!--配置视图解析器--> <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/pages/"></property> <property name="suffix" value=".jsp"></property> </bean> <!--配置文件上传解析器，id必须时multipartResolver--> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!--最大上传大小，单位字节，10MB是10*1024*1024=--> <property name="maxUploadSize" value="10485760"></property> </bean> <!--开启springmvc注解驱动--> <mvc:annotation-driven/> </beans>
2.4、处理方法
/** *<input type="file" name="upload"/><br> *springmvc文件上传，表单上传文件的name属性必须与处理方法的MultipartFile类型的参数名一致 * 这里跨服务器上传需要依赖如下连个jar包： * jersey-core * jersey-client */ @RequestMapping("/upload") public String upload(MultipartFile upload) throws IOException { //美女.jpg String filename = upload.getOriginalFilename(); //UUID将-替换成""再拼接上文件后缀 filename = UUID.randomUUID().toString().replace("-","") + "."+filename.split("\.")[1]; //创建一个客户端 Client client = Client.create(); String path = "http://localhost:9090/uploads/"; //客户端与图片服务器链接 WebResource webResource = client.resource(path+filename); //上传 webResource.put(upload.getBytes()); System.out.println(filename); return "success"; }
2.5、总结
2.5.1、报错：com.sun.jersey.api.client.UniformInterfaceException: PUT http://localhost:9090/uploads/654a1661b41149cea4c920f8e5734970.jpg returned a response status of 405 Method Not Allowed
2.5.1.1、原因：TOMCAT考虑到安全性，默认关闭了TOMCAT的PUT和DELETE请求(即readonly = true)
2.5.1.2、解决方法：进入到tomcat的conf目录下，修改web.xml,在default servlet下增加参数readonly=false
<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>
2.5.2、报错：com.sun.jersey.api.client.UniformInterfaceException: PUT http://localhost:9090/uploads/0d843b18f5b04ad087b54bb125699c4e.jpg returned a response status of 409 Conflict
2.5.2.1、原因：我们在创建文件服务器时，webapp下的uploads文件夹是空的，导致编译时并没有拷贝到target/uploadserver下
2.5.2.2、解决方法：在target/uploadserver下手动创建uploads目录
