第十章 SpringMVC應用Ⅱ
阿新 • • 發佈：2018-12-14
SpringMVC攔截器
1. 建立攔截類,實現HandlerInterceptor介面
package com.interceptor; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; /* * 建立攔截器類,實現HandlerInterceptor */ public class TestInterceptor implements HandlerInterceptor{ @Override public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3) throws Exception { System.out.println("處理請求之後....."); } @Override public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3) throws Exception { System.out.println("處理請求中....."); } @Override public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception { System.out.println("處理請求之前....."); // true 是指將請求進行釋放傳遞 return true; } }
2. 在配置檔案中配置攔截器
<!-- 配置攔截器 --> <mvc:interceptors> <!-- 注入攔截器類,攔截所有請求 --> <bean class="com.interceptor.TestInterceptor"></bean> <mvc:interceptor> <!-- 攔截指定路徑下的請求 --> <mvc:mapping path="/test/one.do"/> <bean class="com.interceptor.TestInterceptor"></bean> </mvc:interceptor> </mvc:interceptors>
SpringMVC上傳
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>檔案上傳</title> </head> <body> <form action="test/upload.do" enctype="multipart/form-data" method="post"> 說明: <input type="text" name="show" /><br /><br /> 檔案: <input type="file" name="file" value="" /><br /><br /> <input type="submit" /> </form> </body> </html>
<?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: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-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
">
<context:component-scan base-package="com.controller"></context:component-scan>
<bean id="urlBasedViewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>
<property name="prefix" value="/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<!-- SpringMVC檔案上傳配置:id為固定值 -->
<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>
package com.controller;
import java.io.File;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
@Controller
@RequestMapping("/test")
public class Test {
@RequestMapping("/upload.do")
public String upload(String show ,@RequestParam("file")MultipartFile file,HttpServletRequest request){
// 獲取專案的絕對路徑拼接檔名字
String filePath = request.getSession().getServletContext().getRealPath(File.separator)+file.getOriginalFilename();
// 將檔案寫到指定路徑下的檔案中
try {
file.transferTo(new File(filePath));
} catch (IllegalStateException e) {
System.err.println("檔案引數錯誤");
} catch (IOException e) {
System.err.println("檔案操作流失敗");
}
// 獲取會話,寫入檔名字
HttpSession session = request.getSession();
session.setAttribute("file",file.getOriginalFilename());
return "ok";
}
}
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>載入圖片</title>
</head>
<body>
<h1>檔案上傳成功</h1>
<!-- 根據URL路徑訪問圖片 -->
<img alt="檔案載入失敗" src="<%=basePath %>${file}" />
</body>
</html>