【原创文章】
使用Spring Boot的Web项目,处理/login请求的控制器方法(该方法会返回JSON格式的数据)。此时如果访问localhost:8080/login.html,用户期望返回jsons数据,但框架却报错:
There was an unexpected error (type=Not Acceptable, status=406).
Could not find acceptable representation
或者这样的异常信息:
org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.handleNoMatch(RequestMappingInfoHandlerMapping.java:235) ~[spring-webmvc-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lookupHandlerMethod(AbstractHandlerMethodMapping.java:382) ~[spring-webmvc-4.2.4.RELEASE.jar:4.2.4.RELEASE]
错误原因:
Spring Boot的MVC默认配置中使用的 ViewResolver 为 ContentNegotiatingViewResolver,该视图解析器的功能是根据要请求的文档类型,来查找不同的视图以返回对应格式的文档。请求的文档类型要可以从请求头中的Accept中获取,也可以通过URI后缀名得到,如/login.html即为请求HTML格式的文档,这两种方式分别对应着两种不同的Strategy(策略),默认为根据URI后缀名。
ContentNegotiatingViewResolver中有说明:
The ContentNegotiatingViewResolver does not resolve views itself but rather delegates to other view resolvers, selecting the view that resembles the representation requested by the client. Two strategies exist for a client to request a representation from the server:
• Use a distinct URI for each resource, typically by using a different file extension in the URI. For example, the URIhttp://www.example.com/users/fred.pdf requests a PDF representation of the user fred, and http://www.example.com/users/fred.xmlrequests an XML representation.
• Use the same URI for the client to locate the resource, but set the Accept HTTP request header to list the media types that it understands. For example, an HTTP request for http:// www.example.com/users/fred with an Accept header set to application/pdf requests a PDF representation of the user fred, while http://www.example.com/users/fred with an Accept header set to text/xml requests an XML representation. This strategy is known as content negotiation.
因此,当用户请求 /login.html 时,spring会查找/login对应的控制器,并得到其返回的文档类型为application/json, 然后判断它与后缀名.html文档类型是否匹配,如果不匹配,就报HttpMediaTypeNotAcceptableException了。
其实它的初衷是好的,它是想实现访问/user.json时返回JSON数据,访问/user.html返回HTML, 访问/user.xml则返回XML的功能。但是在这里我们只用Spring Boot提供RESTful接口,因此该功能就无用武之地了。
解决方案
我们刚才在上面说了Spring 会通过URI后缀获取请求格式,当访问/login.html的时候,那么根据当前的URI获取到后缀.html,那么判断与.html文档类型是否匹配,匹配的话执行相应的解析器。那么我们就会想,我们能够关闭这种默认的后缀匹配规则呢,既然本文章说是完美解决答案就是肯定的。解决步骤就两步骤:
(1)在启动类App.java类中继承:WebMvcConfigurerAdapter
(2)覆盖方法:configureContentNegotiation
具体代码如下:
package com.kfit;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
/**
*
* @author Angel --守护天使
* @version v.0.1
* @date 2016年7月29日下午7:06:11
*/
@SpringBootApplication
public class ApiCoreApp extends WebMvcConfigurerAdapter {
/**
(1)在启动类App.java类中继承:WebMvcConfigurerAdapter
(2)覆盖方法:configureContentNegotiation
favorPathExtension表示支持后缀匹配,
属性ignoreAcceptHeader默认为fasle,表示accept-header匹配,defaultContentType开启默认匹配。
例如:请求aaa.xx,若设置<entry key="xx" value="application/xml"/> 也能匹配以xml返回。
根据以上条件进行一一匹配最终,得到相关并符合的策略初始化ContentNegotiationManager
*/
@Override
public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
configurer.favorPathExtension(false);
}
public static void main(String[] args) {
SpringApplication.run(ApiCoreApp.class, args);
}
}
这里说下核心代码:
configurer.favorPathExtension(false);
favorPathExtension表示支持后缀匹配,
属性ignoreAcceptHeader默认为fasle,表示accept-header匹配,defaultContentType开启默认匹配。
例如:请求aaa.xx,若设置<entry key="xx" value="application/xml"/> 也能匹配以xml返回。
根据以上条件进行一一匹配最终,得到相关并符合的策略初始化ContentNegotiationManager
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第十一章 Spring Boot 日志
1、spring boot日志—理论
2、Spring Boot日志-logback
3、Spring Boot日志-log4j2
第十二章 Spring Boot 知识点2
1、spring boot 服务配置和部署
2、Spring Boot 定制URL匹配规则
历史章节:
第一章 快速开始
1、Spring Boot之Hello World
2、Spring Boot之Hello World访问404
第二章 Spring Boot之JSON
1、spring boot返回json数据
2、Spring Boot完美使用FastJson解析JSON数据
第三章 Spring Boot热部署
1、Spring Boot热部署(springloader)
2、springboot + devtools(热部署)
第四章 Spring Boot数据库
1、Spring Boot JPA/Hibernate/Spring Data概念
2、Spring Boot JPA-Hibernate
3、Spring Boot Spring Data JPA介绍
4、Spring Boot JdbcTemplate
5、Spring Boot集成MyBatis
第五章 web开发
1、全局异常捕捉
2、配置server信息
3、spring boot使用thymeleaf
4、Spring Boot 使用freemarker
5、Spring Boot添加JSP支持
第六章 定时任务
1、Spring Boot定时任务
2、Spring Boot 定时任务升级篇(动态修改cron参数)
3、Spring Boot 定时任务升级篇(动态添加修改删除定时任务)
4、Spring Boot 定时任务升级篇(集群/分布式下的定时任务说明)
5、Spring Boot Quartz介绍
6、Spring Boot Quartz在Java Project中使用
7、Spring Boot 集成Quartz普通使用
8、Spring Boot 集成Quartz升级版
9、Spring Boot 集成Quartz二次升级版
10、Spring Boot 集成Quartz-Job如何自动注入Spring容器托管的对象
第七章 Spring Boot MyBatis升级篇
1、Spring Boot MyBatis升级篇-注解
2、Spring Boot MyBatis升级篇-注解-自增ID
3、Spring Boot MyBatis升级篇-注解-增删改查
4、Spring Boot MyBatis升级篇-注解-分页查询
5、Spring Boot MyBatis升级篇-注解-分页PageHelper不生效
6、Spring Boot MyBatis升级篇-注解- mybatic insert异常:BindingException: Parameter 'name' not found
7、Spring Boot MyBatis升级篇-注解- #和$符号特别篇
8、Spring Boot MyBatis升级篇-注解-@Result
9、Spring Boot MyBatis升级篇-注解-动态SQL(if test)-方案一:<script>
10、Spring Boot MyBatis升级篇-注解-动态SQL(if test)-方案二:@Provider
11、Spring Boot MyBatis升级篇-注解-动态SQL-参数问题
12、Spring Boot MyBatis升级篇-注解-特别篇:@MapperScan和@Mapper
13、Spring Boot MyBatis升级篇-XML
14、Spring Boot MyBatis升级篇-XML-自增ID
15、Spring Boot MyBatis升级篇-XML-增删改查
16、Spring Boot MyBatis升级篇-XML-分页查询
17、Spring Boot MyBatis升级篇-XML-分页PageHelper不生效
18、Spring Boot MyBatis升级篇-XML-动态SQL(if test)
19、Spring Boot MyBatis升级篇-XML-注解-初尝试
20、Spring Boot MyBatis升级篇- pagehelper替换为pagehelper-spring-boot-starter
第八章 Spring Boot 知识点1
1、Spring Boot 拦截器HandlerInterceptor
2、Spring Boot启动加载数据CommandLineRunner
3、Spring Boot环境变量读取和属性对象的绑定
4、Spring Boot使用自定义的properties
5、Spring Boot使用自定义的properties
6、Spring Boot使用@SpringBootApplication
7、Spring Boot 监控和管理生产环境
第十章 Spring Boot 打包部署
1、Spring Boot打包部署((提供Linux的sh文件))
第十一章 Spring Boot 日志
1、spring boot日志—理论
2、Spring Boot日志-logback
3、Spring Boot日志-log4j2
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