Spring 是一款目前主流的 Java EE 轻量级开源框架 ,是 Java 世界最为成功的框架之一，在很多项目中，我们都会导入spring框架，那spring框架怎么导入?下面来我们就来给大家讲解一下。
1.首先下载Spring的jar包;
2.在web.xml文件里加入如下代码：
<span style="font-size: small;"> <!-- Spring Configures --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/*-context.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener></span>
<span style="font-size: small;"><?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="exportTableCondition" class="com.kingstar.hbm.dorado.ExportTableCondition" /> <bean id="organEffectDetail" class="com.kingstar.hbm.dorado.OrganEffectDetail" /> <bean id="completedCaseDetail" class="com.kingstar.hbm.dorado.CompletedCaseDetail" /> <bean id="dealingClaimDetail" class="com.kingstar.hbm.dorado.DealingClaimDetail" /> <bean id="guaranteeClaimDetail" class="com.kingstar.hbm.dorado.GuaranteeClaimDetail" /> </beans> </span>
到此为止就可用spring了。
Spring如何实现文件上传?
分为前端JSP编写和后台Controller的编写。
前期准备工作，首先要引入commons-fileupload这个jar包，pom.xml中的配置如下：
<!-- 实现文件上传，spring集成了这个功能 --> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.2.2</version> </dependency>
然后配置拦截器，在dispatcher-servlet.xml中添加
<!-- 实现文件上传，这样一旦某个Request是一个MultipartRequest，它就会首先被MultipartResolver处理，然后再转发相应的Controller --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- 设置上传文件的最大尺寸为1MB --> <property name="maxUploadSize"> <value>1048576</value> </property> </bean>
直接上代码：
1、前端JSP编写
upload.jsp
代码如下:
<%@ page language="java" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <script src="resources/js/jquery.js"></script> </head> <body> <form method="post" action="upload.do" enctype="multipart/form-data"> <input type="file" name="file" /> <input type="submit" /> </form> </body> </html>
2、后台UploadController编写
代码如下:
package nju.software.xkxt.web.controller;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
/**
* @author typ
*
*/
@Controller
public class UploadController
{
/**
* 进入下载界面
*
* @param request
* @param response
* @param model
* @return
* @throws IOException
*/
@RequestMapping(value = "upload_enter.do", method = RequestMethod.GET)
public String enter(HttpServletRequest request
, HttpServletResponse response, ModelMap model) throws IOException
{
// 进入下载界面
return "upload";
}
/**
* 具体的实现下载功能
*
* @param request
* @param response
* @param model
* @throws IOException
*/
@RequestMapping(value = "upload.do", method = RequestMethod.POST)
public void upload(HttpServletRequest request
, HttpServletResponse response, ModelMap model) throws IOException
{
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
// 得到上传的文件
MultipartFile mFile = multipartRequest.getFile("file");
// 得到上传服务器的路径
String path = request.getSession()
.getServletContext()
.getRealPath("/WEB-INF/upload/");
// 得到上传的文件的文件名
String filename = mFile.getOriginalFilename();
InputStream inputStream = mFile.getInputStream();
byte[] b = new byte[1048576];
int length = inputStream.read(b);
path += "\\" + filename;
// 文件流写到服务器端
FileOutputStream outputStream = new FileOutputStream(path);
outputStream.write(b, 0, length);
inputStream.close();
outputStream.close();
}
}这样就很容易的实现了文件上传的功能，spring框架是企业项目中经常使用的框架之一，它能够简化 Java 企业级应用的开发难度和开发周期。提高开发人员的工作效率!最后大家如果想要了解更多java架构师知识，敬请关注奇Q工具网。
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