java随记

坚持就是胜利!

 

springboot文件上传等杂项

1,springboot中文件上传
springmvc中配置文件上传写法在boot并不支持
@Bean
public MultipartResolver multipartResolver() {
CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
multipartResolver.setMaxUploadSize(100000000);
return multipartResolver;
}
得这样写
  @Bean
   public MultipartConfigElement multipartConfigElement() {
       MultipartConfigFactory factory = new MultipartConfigFactory();
       factory.setMaxFileSize("128KB");
       factory.setMaxRequestSize("128KB");
       return factory.createMultipartConfig();
   }

2,拦截器
继承HandlerInterceptorAdapter确实可以拦截,但是afterCompletion在preHandle方法返回false后并
不执行,那么只能在preHandle中处理了,比如转向,ajax请求返回内容

3,关于快速跳转
有时候只是做一个简单的跳转,可以集中写在这里
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/index").setViewName("/index");
       registry.addViewController("/converter").setViewName("/converter");
}

完整示例:
package com.example.demo.config;
import java.util.List;
import javax.servlet.MultipartConfigElement;
import org.springframework.boot.web.servlet.MultipartConfigFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;
//其中默认配置的 /** 映射到 /static (或/public、/resources、/META-INF/resources) 
//其中默认配置的 /webjars/** 映射到 classpath:/META-INF/resources/webjars/ 
/*
spring.mvc.static-path-pattern=
@Configuration
public class MyWebAppConfigurer extends WebMvcConfigurerAdapter {
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/myres/**").addResourceLocations("classpath:/myres/");
//使用外部目录 registry.addResourceHandler("/api_files/**").addResourceLocations("file:D:/data/api_files");
super.addResourceHandlers(registry);
}
@Bean
public InternalResourceViewResolver viewResolver() {
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setPrefix("/WEB-INF/views/");
viewResolver.setSuffix(".jsp");
viewResolver.setViewClass(JstlView.class);
return viewResolver;
}
//拦截器
@Override
public void addInterceptors(InterceptorRegistry registry) {// 2
InterceptorRegistration i=registry.addInterceptor(demoInterceptor());
i.addPathPatterns("/jsp/*");//只拦截 /jsp/* 的action
}
@Bean
// 1  配置拦截器
public DemoInterceptor demoInterceptor() {
return new DemoInterceptor();
}
//快速转向
@Override
public void addViewControllers(ViewControllerRegistry registry) {
// registry.addViewController("/index").setViewName("/index");
registry.addViewController("/toUpload").setViewName("/upload");
registry.addViewController("/converter").setViewName("/converter");
registry.addViewController("/sse").setViewName("/sse");
registry.addViewController("/async").setViewName("/async");
}
   @Bean
   public MultipartConfigElement multipartConfigElement() {
       MultipartConfigFactory factory = new MultipartConfigFactory();
       factory.setMaxFileSize("128KB");
       factory.setMaxRequestSize("128KB");
       return factory.createMultipartConfig();
   }
}
拦截器类
public class DemoInterceptor extends HandlerInterceptorAdapter {// 1
@Override
public boolean preHandle(HttpServletRequest request, // 2
HttpServletResponse response, Object handler) throws Exception {
long startTime = System.currentTimeMillis();
System.out.println("本次始请求处理时间为:" + startTime + "ms");
request.setAttribute("startTime", startTime);
if (request.getHeader("x-requested-with") != null
&& request.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")) {
response.setHeader("sessionstatus", "timeout"); // 响应头设置session状态
} else {
response.sendRedirect("/");
}
return false;
}
@Override
public void postHandle(HttpServletRequest request, // 3
HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
long startTime = (Long) request.getAttribute("startTime");
request.removeAttribute("startTime");
long endTime = System.currentTimeMillis();
System.out.println("本次请求处理时间�?:" + new Long(endTime - startTime) + "ms");
request.setAttribute("handlingTime", endTime - startTime);
}
}
文件上传页面upload.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>upload page</title>
</head>
<body>
<div class="upload">
<form action="upload" enctype="multipart/form-data" method="post">
<input type="file" name="file"/><br/>
<input type="submit" value="上传">
</form>
</div>
</body>
</html>

文件上传控制器类

@Controller
public class UploadController {
@RequestMapping(value = "/upload",method = RequestMethod.POST)
//MultipartFile[] ,涓婁紶澶氫釜鏂囦欢
public @ResponseBody String upload(@RequestParam("file") MultipartFile file) {//1
try {
FileUtils.writeByteArrayToFile(new File("e:/upload/"+file.getOriginalFilename()),
file.getBytes()); //2
return "ok";
} catch (IOException e) {
e.printStackTrace();
return "wrong";
}
}
}

posted on 2017-09-18 11:01 傻 瓜 阅读(452) 评论(0)  编辑  收藏 所属分类: 杂项


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