SpringMVC 注解(三) requestHeader,requestPart

╰+哭是因爲堅強的太久メ 2022-05-22 09:24 324阅读 0赞

## @RequestHeader ##

类似requestbody和requestparam 不过请求的参数必须是 在header 信息中,否则会报400,错误,因为默认 required属性为true

# #

## @RequestPart ##

支持对multipart/form-data 类型的参数进行参数绑定,支持的参数类型有 :MultipartFile,MulitpartResolver , Part 等参数

对于其他任意的参数类型,类似于 requestBody 对参数的解析

注意:requestParam 类型对于 multipart/form-data  也支持参数解析,区别在于处理字符串时不同

示例:

package com.game.controller;
    
    import java.io.File;
    import java.io.IOException;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestPart;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.multipart.MultipartFile;
    
    @Controller
    @RequestMapping(value="test",produces="text/html;charset=UTF-8")
    public class TestController {
    	
    	@RequestMapping("one")
    	@ResponseBody
    	public String test(HttpServletRequest req,HttpServletResponse resp,@RequestPart String tk){
    		System.out.println("tk="+tk);
    		return "ok";
    	}
    	
    	
    	
    	//文件上传
    	@RequestMapping("uploadFile")
    	@ResponseBody
    	public void uploadFile(HttpServletRequest req,HttpServletResponse resp,@RequestPart("test") MultipartFile file) throws IllegalStateException, IOException{
    		System.out.println("ok");
    		System.out.println(file);
    		String fileName = file.getOriginalFilename();
    		System.out.println("fileName="+fileName);
    		String path = req.getSession().getServletContext().getRealPath("upload");  
    		System.out.println("path="+path);
    		File seFile = new File(path,fileName);
    		file.transferTo(seFile);
    		return;
    	}
    	
    	
    }

## 注意: ##

如果@RequestPart 注解的参数类型是MultipartFile 就必须配置 multipartResolver 解析器, 如果@RequestPart 注解的参数类型是Servlet 3.0 规范的 Part 参数,就不必配置multipartResolver 解析器

这里@RequestPart 注解的是MultipartFile必须配置 multipartResolver 解析器,

否则为报500 Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is java.lang.IllegalStateException: Unable to process parts as no multi-part configuration has been provided

一般我们都是在application-mvc.xml 中配置,可是我现在是使用的非xml文件启动的springmvc (参考:[https://blog.csdn.net/kzcming/article/details/80741743][https_blog.csdn.net_kzcming_article_details_80741743]),可以在WebConfig 中新增 multipartResolver 的配置,代码如下:

package before.springmvc;
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.ComponentScan;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.multipart.MultipartResolver;
    import org.springframework.web.multipart.commons.CommonsMultipartResolver;
    import org.springframework.web.servlet.ViewResolver;
    import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
    import org.springframework.web.servlet.config.annotation.EnableWebMvc;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
    import org.springframework.web.servlet.view.InternalResourceViewResolver;
    
    /**
     * 配置 SpringMVC 视图解析类WebConfig ,需要继承自 WebMvcConfigureAdapter
     * 
     * 类似于application-mvc.xml 文件,此文件的配置大部分都可在此类中配置
     * @author Administrator
     *
     */
    
    @Configuration
    @EnableWebMvc //启动 springMVC
    @ComponentScan(value = {"com.game.controller"})	//配置组件扫描
    public class WebConfig extends WebMvcConfigurerAdapter{
    	
    	//配置jsp 视图解析器
    	@Bean
    	public ViewResolver viewResolver(){
    		InternalResourceViewResolver resolver = new InternalResourceViewResolver();
    		resolver.setPrefix("/view");//设置预加载路径/目录
    		resolver.setSuffix(".jsp");  //设置允许后缀 //返回时也自动匹配到该后缀
    		resolver.setExposeContextBeansAsAttributes(true);
    		return resolver;
    	}
    	
    	//配置静态资源的处理
    	@Override
    	public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
    		configurer.enable();//对静态资源的请求转发到容器缺省的servlet,而不使用 DispatcherServlet
    	}
    	
    	//配置MultipartResolver 解析器
    	@Bean
    	public MultipartResolver multipartResolver(){
    		CommonsMultipartResolver multipartRe = new CommonsMultipartResolver();
    		multipartRe.setMaxUploadSize(1024000000);
    		multipartRe.setResolveLazily(true);
    		multipartRe.setMaxInMemorySize(4096);
    		multipartRe.setDefaultEncoding("UTF-8");//设置默认字符集
    		return multipartRe;
    		
    	}
    
    }

[https_blog.csdn.net_kzcming_article_details_80741743]: https://blog.csdn.net/kzcming/article/details/80741743