SpringMVC之文件上传、拦截器

一、导jar包：

 二、配置springmvc.xml：

<!-- 配置CommonsMultipartResolver,用于文件上传 -->
		<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
			<property name="defaultEncoding" value="UTF-8"></property>
			<!-- 上传单个文件最大值，单位byte -->
			<property name="maxUploadSize" value="102400"></property>
		</bean>

　　三、controller.java:

@RequestMapping(value="testUpload")
	public String testUpload(@RequestParam("desc") String desc,@RequestParam("file") MultipartFile file) throws IOException{
		System.out.println("描述信息："+desc);
		InputStream input = file.getInputStream();
		OutputStream output = new FileOutputStream("C:\Users\hp\Desktop\test.gif");
		byte[] bs = new byte[1024];
		int len = -1;
		while((len = input.read(bs))!=-1){
			output.write(bs,0,len);
		}
		output.close();
		input.close();
		System.out.println("上传成功");
		return "success";
	}

　　四、jsp:

<form action="SpringMVCController/testUpload" method="post" enctype="multipart/form-data">
		照片:<input name="file" type="file"><br/>
		描述:<input name="desc" type="text"><br/>
		<input type="submit" value="上传文件">
	</form>
	

　　五、拦截器：

创建实现类：Myinterceptor.java:

package org.ruangong.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class MyInterceptor implements HandlerInterceptor{

	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		System.out.println("拦截请求");
		// TODO Auto-generated method stub
		return true;
	}

	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		// TODO Auto-generated method stub
		System.out.println("拦截相应");
		
	}

	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub
		System.out.println("拦截渲染");
	}

}

　 springmvc.xml中进行配置：

<mvc:interceptors>
    		<bean class="org.ruangong.interceptor.MyInterceptor"></bean>
    	</mvc:interceptors>