Spring MVC 文件上傳 & 文件下載

索引：開源Spring解決方案--lm.solution 參看代碼 GitHub： pom.xml WebConfig.java index.jsp upload.jsp FileUploadController.java Files_Utils_DG.java 一、要點講解 1.引入文件上傳下載 ...

索引：

開源Spring解決方案--lm.solution

參看代碼 GitHub：

FileUploadController.java

Files_Utils_DG.java

一、要點講解

　　1.引入文件上傳下載的類庫

　　commons-fileupload

　　commons-io

　　2.配置 MultipartResolver 組件(bean)

　　@Bean public MultipartResolver multipartResolver() : 該組件用來解析 http multipart 類型的請求體

　　3.配置靜態文件的請求

　　@Override public void addResourceHandlers(ResourceHandlerRegistry registry) ：

　　　　該方法中註冊請求資源路徑，以便 href 鏈接中靜態資源的請求鏈接與下載。

　　　　registry.addResourceHandler("/files/**").addResourceLocations("classpath:/files/");

　　4.添加頁面快捷轉向，這樣就不用寫沒有邏輯僅做頁面轉向的 Controller 了

　　　　@Override public void addViewControllers(ViewControllerRegistry registry)：

　　　　　　registry.addViewController("/upload").setViewName("fileupload/upload");

　　5.前臺表單中的設置

　　　　enctype="multipart/form-data" ：在 form 表單中必須指定為 multipart

　　　　fileElementId:'file_AjaxFile' ：在 ajax 中要指定 <input type="file"> 的 id

　　6.後臺中接收設置

　　　　@RequestParam("file_upload") MultipartFile multipartFile : 在方法參數中這樣指定後，就可以從請求體中讀取上傳的文件及文件信息了

　　7.其它詳細細節可具體參看代碼，及代碼中的解釋

　　　... ...

二、詳細使用及代碼

　　1.pom.xml

  1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  2          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  3     <parent>
  4         <artifactId>solution</artifactId>
  5         <groupId>lm.solution</groupId>
  6         <version>1.0-SNAPSHOT</version>
  7     </parent>
  8     <modelVersion>4.0.0</modelVersion>
  9     <groupId>lm.solution</groupId>
 10     <artifactId>web</artifactId>
 11     <packaging>war</packaging>
 12     <version>1.0-SNAPSHOT</version>
 13     <name>web Maven Webapp</name>
 14     <url>http://maven.apache.org</url>
 15     <dependencies>
 16         <!--Module-->
 17         <dependency>
 18             <groupId>lm.solution</groupId>
 19             <artifactId>service</artifactId>
 20             <version>1.0-SNAPSHOT</version>
 21         </dependency>
 22         <dependency>
 23             <groupId>lm.solution</groupId>
 24             <artifactId>common</artifactId>
 25             <version>1.0-SNAPSHOT</version>
 26         </dependency>
 27 
 28         <!--Libary-->
 29         <!--spring mvc-->
 30         <dependency>
 31             <groupId>org.springframework</groupId>
 32             <artifactId>spring-webmvc</artifactId>
 33         </dependency>
 34         <!--cglib-->
 35         <dependency>
 36             <groupId>cglib</groupId>
 37             <artifactId>cglib</artifactId>
 38         </dependency>
 39         <!-- mybatis核心包 -->
 40         <dependency>
 41             <groupId>org.mybatis</groupId>
 42             <artifactId>mybatis</artifactId>
 43         </dependency>
 44         <!--mybatis spring 插件 -->
 45         <dependency>
 46             <groupId>org.mybatis</groupId>
 47             <artifactId>mybatis-spring</artifactId>
 48         </dependency>
 49         <!-- Mysql資料庫驅動包 -->
 50         <dependency>
 51             <groupId>mysql</groupId>
 52             <artifactId>mysql-connector-java</artifactId>
 53         </dependency>
 54         <!-- connection pool -->
 55         <dependency>
 56             <groupId>com.alibaba</groupId>
 57             <artifactId>druid</artifactId>
 58             <!--<scope>runtime</scope>-->
 59         </dependency>
 60         <!--servlet-->
 61         <dependency>
 62             <groupId>javax.servlet</groupId>
 63             <artifactId>javax.servlet-api</artifactId>
 64             <scope>provided</scope>
 65         </dependency>
 66         <dependency>
 67             <groupId>javax.servlet.jsp</groupId>
 68             <artifactId>jsp-api</artifactId>
 69             <scope>provided</scope>
 70         </dependency>
 71         <dependency>
 72             <groupId>javax.servlet</groupId>
 73             <artifactId>jstl</artifactId>
 74         </dependency>
 75         <!-- 映入JSON lib -->
 76         <dependency>
 77             <groupId>net.sf.json-lib</groupId>
 78             <artifactId>json-lib</artifactId>
 79             <classifier>jdk15</classifier>
 80         </dependency>
 81         <!-- 用dom4j解析xml文件 -->
 82         <dependency>
 83             <groupId>dom4j</groupId>
 84             <artifactId>dom4j</artifactId>
 85         </dependency>
 86         <!-- ehcache -->
 87         <dependency>
 88             <groupId>net.sf.ehcache</groupId>
 89             <artifactId>ehcache-core</artifactId>
 90         </dependency>
 91         <dependency>
 92             <groupId>net.sf.ehcache</groupId>
 93             <artifactId>ehcache-web</artifactId>
 94         </dependency>
 95         <!-- 上傳組件包 -->
 96         <dependency>
 97             <groupId>commons-fileupload</groupId>
 98             <artifactId>commons-fileupload</artifactId>
 99         </dependency>
100         <dependency>
101             <groupId>commons-io</groupId>
102             <artifactId>commons-io</artifactId>
103         </dependency>
104         <!-- common others -->
105         <dependency>
106             <groupId>commons-codec</groupId>
107             <artifactId>commons-codec</artifactId>
108         </dependency>
109         <dependency>
110             <groupId>org.apache.commons</groupId>
111             <artifactId>commons-collections4</artifactId>
112         </dependency>
113         <dependency>
114             <groupId>org.apache.commons</groupId>
115             <artifactId>commons-lang3</artifactId>
116         </dependency>
117         <!-- commons-beanutils -->
118         <dependency>
119             <groupId>commons-beanutils</groupId>
120             <artifactId>commons-beanutils</artifactId>
121             <exclusions>
122                 <exclusion>
123                     <groupId>commons-logging</groupId>
124                     <artifactId>commons-logging</artifactId>
125                 </exclusion>
126             </exclusions>
127         </dependency>
128         <!-- freemarker -->
129         <dependency>
130             <groupId>org.freemarker</groupId>
131             <artifactId>freemarker</artifactId>
132         </dependency>
133         <!-- org.apache.httpcomponents -->
134         <dependency>
135             <groupId>org.apache.httpcomponents</groupId>
136             <artifactId>httpcore</artifactId>
137         </dependency>
138         <dependency>
139             <groupId>org.apache.httpcomponents</groupId>
140             <artifactId>httpclient</artifactId>
141         </dependency>
142         <!-- redis.clients/jedis -->
143         <dependency>
144             <groupId>redis.clients</groupId>
145             <artifactId>jedis</artifactId>
146         </dependency>
147         <!-- com.rabbitmq/amqp-client -->
148         <dependency>
149             <groupId>com.rabbitmq</groupId>
150             <artifactId>amqp-client</artifactId>
151         </dependency>
152         <!-- com.alibaba/fastjson -->
153         <dependency>
154             <groupId>com.alibaba</groupId>
155             <artifactId>fastjson</artifactId>
156         </dependency>
157     </dependencies>
158     <build>
159         <finalName>web</finalName>
160 
161         <plugins>
162             <plugin>
163                 <groupId>org.apache.tomcat.maven</groupId>
164                 <artifactId>tomcat8-maven-plugin</artifactId>
165             </plugin>
166         </plugins>
167     </build>
168 </project>

　　2.WebConfig.java

  1 package lm.solution.web.config.configs;
  2 
  3 import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
  4 import lm.solution.common.web.messageconverter.CustomMessageConverter;
  5 import lm.solution.web.config.beans.TimerInterceptor;
  6 import org.springframework.context.annotation.Bean;
  7 import org.springframework.context.annotation.ComponentScan;
  8 import org.springframework.context.annotation.Configuration;
  9 import org.springframework.http.MediaType;
 10 import org.springframework.http.converter.HttpMessageConverter;
 11 import org.springframework.web.multipart.MultipartResolver;
 12 import org.springframework.web.multipart.commons.CommonsMultipartResolver;
 13 import org.springframework.web.servlet.config.annotation.*;
 14 import org.springframework.web.servlet.view.InternalResourceViewResolver;
 15 import org.springframework.web.servlet.view.JstlView;
 16 
 17 import java.util.ArrayList;
 18 import java.util.List;
 19 
 20 @Configuration
 21 /**
 22  * @EnableWebMvc 註解會開啟一些預設配置，如：ViewResolver MessageConverter 等,
 23  * 若無此註解，重寫 WebMvcConfigurerAdapter 方法無效
 24  * */
 25 @EnableWebMvc
 26 @ComponentScan(value = {
 27         "lm.solution.web",
 28         "lm.solution.service.mysql",
 29         "lm.solution.service.webtest"
 30 })
 31 /**
 32  * 繼承 WebMvcConfigurerAdapter 類，重寫其方法可對 spring mvc 進行配置
 33  * */
 34 public class WebConfig extends WebMvcConfigurerAdapter {
 35 
 36     // 重寫 addViewControllers 簡化頁面快捷轉向，這樣就可以不用配置 Controller 了
 37     @Override
 38     public void addViewControllers(ViewControllerRegistry registry) {
 39 
 40         registry.addViewController("/").setViewName("index");
 41         registry.addViewController("/error").setViewName("error/error");
 42         registry.addViewController("/excel").setViewName("excel/excel");
 43         // 文件上傳下載
 44         registry.addViewController("/upload").setViewName("fileupload/upload");
 45         registry.addViewController("/ImageValidateCodeLogin").setViewName("login/imageValidateCodeLogin");
 46         registry.addViewController("/restfulapi").setViewName("restful/user");
 47         registry.addViewController("/jaxwsri").setViewName("jaxwsri/wsri");
 48         registry.addViewController("/redis").setViewName("redis/jedis");
 49         registry.addViewController("/mybatisPage").setViewName("db/mybatis");
 50         registry.addViewController("/messageconverter").setViewName("httpmessageconverter/customconverter");
 51         registry.addViewController("/sse").setViewName("serverpushmessage/sse");
 52 
 53     }
 54 
 55     // 配置JSP視圖解析器
 56     @Bean
 57     public InternalResourceViewResolver viewResolver() {
 58         InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
 59         /**
 60          * views 在 /resources/ 下
 61          * */
 62         // 首碼
 63         viewResolver.setPrefix("/WEB-INF/classes/views/");
 64         // 尾碼
 65         viewResolver.setSuffix(".jsp");
 66         viewResolver.setViewClass(JstlView.class);
 67         viewResolver.setContentType("text/html");
 68         // 可以在JSP頁面中通過${}訪問beans
 69         viewResolver.setExposeContextBeansAsAttributes(true);
 70         return viewResolver;
 71     }
 72 
 73     // 配置springMVC處理上傳文件的信息
 74     @Bean
 75     public MultipartResolver multipartResolver() {
 76         CommonsMultipartResolver resolver = new CommonsMultipartResolver();
 77         resolver.setDefaultEncoding("UTF-8");
 78         resolver.setMaxUploadSize(10485760000L);
 79         resolver.setMaxInMemorySize(40960);
 80         return resolver;
 81     }
 82 
 83     // 配置靜態文件處理
 84     @Override
 85     public void addResourceHandlers(ResourceHandlerRegistry registry){
 86 
 87         /**
 88          * addResourceHandler 指的是對外暴露的訪問路徑
 89          * addResourceLocations 指的是文件放置的目錄
 90          * */
 91         registry.addResourceHandler("/assets/**")
 92                 .addResourceLocations("classpath:/assets/");
 93 
 94         // href 鏈接方式 下載文件
 95         registry.addResourceHandler("/files/**")
 96                 .addResourceLocations("classpath:/files/");
 97 
 98         /**
 99          * 解決 No handler found for GET /favicon.ico 異常
100          * */
101         registry.addResourceHandler("/favicon.ico")
102                 .addResourceLocations("classpath:/favicon.ico");
103 
104     }
105 
106     // 重寫 configurePathMatch ，改變路徑參數匹配
107     @Override
108     public void configurePathMatch(PathMatchConfigurer configurer) {
109 
110         /**
111          * Spring mvc 預設 如果路徑參數後面帶點，如 “/mm/nn/xx.yy” 後面的yy值將被忽略
112          * 加入下麵的配置，就不會忽略“.”後面的參數了
113          * */
114         configurer.setUseSuffixPatternMatch(false);
115 
116     }
117 
118 //
119 //    // 負責讀取二進位格式的數據和寫出二進位格式的數據；
120 //    @Bean
121 //    public ByteArrayHttpMessageConverter byteArrayHttpMessageConverter() {
122 //
123 //        return new ByteArrayHttpMessageConverter();
124 //
125 //    }
126 //
127 //