Spring文件上传

文件上传可以使用普通的表单提交，也可以使用AJAX异步提交，如果需要使用AJAX提交则需要引入juery.form.js。

1、普通的表单提交文件上传

web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	version="2.4"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	<!-- spring 监听-->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	
	<!-- spring 字符集过滤 -->
	<filter>
		<filter-name>CharacterEncoding</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>CharacterEncoding</filter-name>
		<url-pattern>*.action</url-pattern>
	</filter-mapping>
	
	<filter-mapping>
		<filter-name>CharacterEncoding</filter-name>
		<url-pattern>*.htm</url-pattern>
	</filter-mapping>
	
	<!-- spring mvc -->
	<servlet>
		<servlet-name>http</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet
		</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:dispatcher-servlet.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>http</servlet-name>
		<url-pattern>*.action</url-pattern>
	</servlet-mapping>
	
</web-app>


dispatcher-servlet.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:p="http://www.springframework.org/schema/p"
	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd   
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd   
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd   
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
       
	<!-- Spring @AutoWired 依赖自动注入,不需要setter方法 -->
	<bean
		class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" />

	<!-- Spring 扫描使用注解的包路径 -->
	<context:component-scan
		base-package="com.it.springweb.controller" />
	
	<!-- Freemarker模板配置 -->
	<bean id="freemarkerConfig"
		class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
		<property name="templateLoaderPath" value="/WEB-INF/freemarker/" />
		<property name="defaultEncoding" value="UTF-8" />
	</bean>
	
	<!--Freemarker视图解析器  -->
	<bean
		class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
		<property name="cache" value="true" />
		<property name="prefix" value="" />
		<property name="suffix" value=".ftl" />
		<property name="exposeSpringMacroHelpers" value="true" />
		<property name="exposeRequestAttributes" value="true" />
		<property name="exposeSessionAttributes" value="true" />
		<property name="requestContextAttribute" value="request" />
		<property name="contentType" value="text/html; charset=utf-8" />
	</bean>

	<!-- Spring JSON 格式转换依赖的Jar -->
	<bean id="mappingJacksonHttpMessageConverter"
		class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
		
	<!-- 支持上传文件 -->
	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<!-- 10M -->
		<property name="maxUploadSize">
			<value>52428800</value>
		</property>
		<property name="maxInMemorySize">
			<value>10240</value>
		</property>
		<property name="defaultEncoding">
			<value>UTF-8</value>
		</property>
	</bean>
</beans>

//普通的文件上传
@Controller
public class MyController {

    @Autowired
    public UserService userService;

    @RequestMapping("/showView")
    public String showView(HttpServletRequest request) {
        userService.deleteUser("1");

        request.setAttribute("name", "张三");
        return "showView";
    }

    /**
     * 
     * 文件上传 <br>
     * 〈功能详细描述〉
     * 
     * @param request
     * @return
     * @see [相关类/方法](可选)
     * @since [产品/模块版本](可选)
     */
    @RequestMapping("/importFileDatas")
    public String importFileDatas(HttpServletRequest request) {
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
        MultipartFile multipartFile = multipartRequest.getFile("uploadFile");

        List<Map<String, Object>> userList = new ArrayList<Map<String, Object>>();
        BufferedReader br = null;
        try {
            InputStream is = multipartFile.getInputStream();
            br = new BufferedReader(new InputStreamReader(is, "UTF-8"));

            String line = null;
            while ((line = br.readLine()) != null) {
                String[] datas = line.split(",");
                Map<String, Object> userMap = new HashMap<String, Object>();

                userMap.put("userName", datas[0]);
                userMap.put("password", datas[1]);
                userMap.put("address", datas[2]);
                userMap.put("phone", datas[3]);

                userList.add(userMap);
            }
        } catch (Exception e) {
            //
        } finally {
            if (br != null) {
                IOUtils.closeQuietly(br);
            }
        }

        // 保存用户数据到用户表
        saveBatchUserList(userList);
        return "showView";
    }

    private void saveBatchUserList(List<Map<String, Object>> userList) {

    }

}

showView.ftl:
<!doctype html>  
<html>  
<head>  
    <meta charset="utf-8"/>  
    <title></title>  
    <#assign ctxPath=request.contextPath>  
    <#setting number_format="#">
    <script type="text/javascript" src="${ctxPath}/staticfile/js/jquery-1.7.1.js"></script>  
    <script>
    	function upload(){
    		$("#uploadForm").submit();
    	}
    </script>
</head>  
  
<body>  
   姓名： ${name!''}
   <form name="uploadForm" id="uploadForm" action="${ctxPath}/importFileDatas.action" 
   		method="post" enctype="multipart/form-data">
   		<input type="file" name="uploadFile">
   		<input type="button" onclick="upload()" value="上传">
   </form>
</body>  
</html>  

2、使用AJAX异步提交

//通过AJAX异步请求实现文件上传
@Controller
public class MyController {
    /**
     * 
     * 文件上传 <br>
     * 〈功能详细描述〉
     * 
     * @param request
     * @return
     * @see [相关类/方法](可选)
     * @since [产品/模块版本](可选)
     */
    @RequestMapping("/importFileDatas")
    public void importFileDatas(HttpServletRequest request, HttpServletResponse response) {
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
        MultipartFile multipartFile = multipartRequest.getFile("uploadFile");

        List<Map<String, Object>> userList = new ArrayList<Map<String, Object>>();
        BufferedReader br = null;
        try {
            InputStream is = multipartFile.getInputStream();
            br = new BufferedReader(new InputStreamReader(is, "UTF-8"));

            String line = null;
            while ((line = br.readLine()) != null) {
                String[] datas = line.split(",");
                Map<String, Object> userMap = new HashMap<String, Object>();

                userMap.put("userName", datas[0]);
                userMap.put("password", datas[1]);
                userMap.put("address", datas[2]);
                userMap.put("phone", datas[3]);

                userList.add(userMap);
            }
        } catch (Exception e) {
            //
        } finally {
            if (br != null) {
                IOUtils.closeQuietly(br);
            }
        }

        // 保存用户数据到用户表
        boolean flag = saveBatchUserList(userList);

        Map<String, Object> result = new HashMap<String, Object>();
        result.put("count", userList.size());
        result.put("flag", flag ? "success" : "failed");
        JSONArray jsonArray=JSONArray.fromObject(result);
        try {
            response.getWriter().print(jsonArray);
        } catch (IOException e) {
        }
    }

    private boolean saveBatchUserList(List<Map<String, Object>> userList) {
        return false;
    }

}

<!doctype html>  
<html>  
<head>  
    <meta charset="utf-8"/>  
    <title></title>  
    <#assign ctxPath=request.contextPath>  
    <#setting number_format="#">
    <script type="text/javascript" src="${ctxPath}/staticfile/js/jquery-1.7.1.js"></script>
    <script type="text/javascript" src="${ctxPath}/staticfile/js/jquery.form.js"></script>  
    <script>
    	function upload(){
			var submitForm=$("#uploadForm")[0];
			var options = {
				target: submitForm,
		        success: function(resultMap) {
		        	//把返回的结果转化为json对象
		        	var result=resultMap[0];
		        	var count=result.count;
		        	var flag=result.flag;
		        	alert("上传"+count+"个");
		        	alert(flag);
		        },
		        error: function(){
		        	alert("系统异常,暂时无法访问!");
		        },
		        type: 'post',
		        dataType: 'json',
		        iframe: true,
		        async:false,
		        clearForm: false,
		        resetForm: false	
			};
			$(submitForm).ajaxSubmit(options);
    	}
    </script>
</head>  
  
<body>  
   姓名： ${name!''}
   <form name="uploadForm" id="uploadForm" action="${ctxPath}/importFileDatas.action" 
   		method="post" enctype="multipart/form-data">
   		<input type="file" name="uploadFile">
   		<input type="button" onclick="upload()" value="上传">
   </form>
</body>  
</html>