springmvc 处理json，上传文件，下载文件

pom.xml

<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.retrofit</groupId><artifactId>Retrofit</artifactId><version>0.0.1-SNAPSHOT</version><packaging>war</packaging><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><spring.version>4.3.2.RELEASE</spring.version><jackson.version>2.8.1</jackson.version><commons-fileupload.version>1.3.1</commons-fileupload.version><commons-lang3.version>3.3.2</commons-lang3.version><commons-io.version>1.3.2</commons-io.version><commons-net.version>3.3</commons-net.version><servlet-api.version>2.5</servlet-api.version></properties><dependencies><dependency><groupId>javax.servlet</groupId><artifactId>servlet-api</artifactId><version>${servlet-api.version}</version><scope>provided</scope></dependency><!--springmvc 4.x Jackson Json处理工具包 --><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>${jackson.version}</version></dependency><!-- springmvc 3.x Jackson Json处理工具包 --><!-- <dependency><groupId>org.codehaus.jackson</groupId><artifactId>jackson-core-asl</artifactId><version>1.9.13</version></dependency><dependency><groupId>org.codehaus.jackson</groupId><artifactId>jackson-mapper-asl</artifactId><version>1.9.13</version></dependency> --><!-- 文件上传组件 --><dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>${commons-fileupload.version}</version></dependency><!-- Apache工具组件 --><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>${commons-lang3.version}</version></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-io</artifactId><version>${commons-io.version}</version></dependency><dependency><groupId>commons-net</groupId><artifactId>commons-net</artifactId><version>${commons-net.version}</version></dependency><!-- spring begin --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aop</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>${spring.version}</version></dependency><!-- spring end --></dependencies></project>

web.xml
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"id="WebApp_ID" version="3.0"><display-name>springmvc</display-name><welcome-file-list><welcome-file>index.html</welcome-file><welcome-file>index.htm</welcome-file><welcome-file>index.jsp</welcome-file><welcome-file>default.html</welcome-file><welcome-file>default.htm</welcome-file><welcome-file>default.jsp</welcome-file></welcome-file-list><!-- Filter 定义 --><!-- Character Encoding filter --><filter><filter-name>encodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param><init-param><param-name>forceEncoding</param-name><param-value>true</param-value></init-param></filter><filter-mapping><filter-name>encodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><!-- springmvc的前端控制器 --><!-- 配置 SpringMVC 的 DispatcherServlet --><!-- The front controller of this Spring Web application, responsible for handling all application requests --><servlet><servlet-name>springDispatcherServlet</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:springmvc.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><!-- Map all requests to the DispatcherServlet for handling --><servlet-mapping><servlet-name>springDispatcherServlet</servlet-name><url-pattern>/</url-pattern></servlet-mapping></web-app>

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.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd"><!-- 配置自定扫描的包 --><context:component-scan base-package="com.retrofit"></context:component-scan><!-- 配置视图解析器: 如何把 handler 方法返回值解析为实际的物理视图 --><beanclass="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/jsp/"></property><property name="suffix" value=".jsp"></property></bean><mvc:annotation-driven /><!-- 配置 MultipartResolver --><bean id="multipartResolver"class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><property name="defaultEncoding" value="UTF-8"></property><property name="maxUploadSize" value="1024000"></property></bean></beans>

controller
package com.retrofit;import java.io.File;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.io.FileUtils;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.http.HttpHeaders;import org.springframework.http.HttpStatus;import org.springframework.http.MediaType;import org.springframework.http.ResponseEntity;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.multipart.MultipartFile;@Controllerpublic class RestrofitControllr {@Autowiredprivate HttpServletRequest request;@RequestMapping("/getUser")@ResponseBodypublic User getUser(User user) {System.out.println(user.toString());return user;}@RequestMapping(value = "/testPost")@ResponseBodypublic User getUser1(@RequestBody User user) {System.out.println(user);return user;}@RequestMapping(value = "/testPath/{id}")@ResponseBodypublic String testPath(@PathVariable Integer id) {System.out.println("testPath:" + id);return id + "";}@RequestMapping("/uploadPic")@ResponseBodypublic String UpLoadPic(@RequestParam("file") MultipartFile file, HttpServletRequest request,HttpServletResponse response) {String path = request.getSession().getServletContext().getRealPath("/upload");String fileName = file.getOriginalFilename();System.out.println(path);File targetFile = new File(path, fileName);if (!targetFile.exists()) {targetFile.mkdirs();}// 保存try {file.transferTo(targetFile);} catch (Exception e) {e.printStackTrace();}return "ok";}/*** * 保存文件 *  * @param file * @return */private boolean saveFile(MultipartFile file) {// 判断文件是否为空if (!file.isEmpty()) {String path = request.getSession().getServletContext().getRealPath("upload");String fileName = file.getOriginalFilename();System.out.println(path);File targetFile = new File(path, fileName);if (!targetFile.exists()) {targetFile.mkdirs();}try {// 转存文件file.transferTo(targetFile);return true;} catch (Exception e) {e.printStackTrace();}}return false;}/** * 多文件上传 * @param desciption * @param files * @param username * @return */@RequestMapping("filesUpload")@ResponseBodypublic String filesUpload(String desciption, @RequestParam("files") MultipartFile[] files, String username) {System.out.println(desciption + username);// 判断file数组不能为空并且长度大于0if (files != null && files.length > 0) {// 循环获取file数组中得文件for (int i = 0; i < files.length; i++) {MultipartFile file = files[i];// 保存文件saveFile(file);}}// 重定向return "ok";}/** * 文件下载 *  * @param fileName * @param file * @return * @throws IOException *  */@RequestMapping("download")public ResponseEntity<byte[]> download() throws IOException {String path = request.getSession().getServletContext().getRealPath("upload");String fileName1 = "1.jpg";File targetFile = new File(path, fileName1);String dfileName = new String(fileName1.getBytes("gb2312"), "iso8859-1");HttpHeaders headers = new HttpHeaders();headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);headers.setContentDispositionFormData("attachment", dfileName);return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(targetFile), headers, HttpStatus.CREATED);}}



                                             
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