org.springframework.web.HttpMediaTypeNotSupportedException: Content type ‘application/json；charset=U

报错

[WARNING] Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported]

解决方法

在这里我将注解配置换成xml配置就可以使用了，但是我实在是不知道为什么会这样，把xml转换为注解没有出现错误，不清楚，以后再去解决吧！

注解配置的两个文件（使用这个方法报错）

• 这个是替换web.xml的文件

package com.yy.config;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.servlet.support.AbstractDispatcherServletInitializer;

import javax.servlet.DispatcherType;
import javax.servlet.FilterRegistration;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import java.util.EnumSet;

public class ServletContainersInitConfig extends AbstractDispatcherServletInitializer {
     
    //创建Servlet容器时，使用注解的方式加载SPRINGMVC配置类中的信息，并加载成WEB专用的ApplicationContext对象
    //该对象放入了ServletContext范围，后期在整个WEB容器中可以随时获取调用
    @Override
    protected WebApplicationContext createServletApplicationContext() {
     
        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
        ctx.register(SpringMVCConfiguration.class);
        return ctx;
    }

    //注解配置映射地址方式，服务于SpringMVC的核心控制器DispatcherServlet
    @Override
    protected String[] getServletMappings() {
     
        return new String[]{
     "/"};
    }

    @Override
    protected WebApplicationContext createRootApplicationContext() {
     
        return null;
    }

    //乱码处理作为过滤器，在servlet容器启动时进行配置，相关内容参看Servlet零配置相关课程
    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
     
        super.onStartup(servletContext);
        CharacterEncodingFilter cef = new CharacterEncodingFilter();
        cef.setEncoding("UTF-8");
        FilterRegistration.Dynamic registration = servletContext.addFilter("characterEncodingFilter", cef);
        registration.addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST,DispatcherType.FORWARD,DispatcherType.INCLUDE),false,"/*");
    }
}

• 这个是替换spring-mvc.xml的注解

package com.yy.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
//表明是一个配置
@Configuration
//扫谁
@ComponentScan(value = "com.yy",includeFilters =
    @ComponentScan.Filter(type=FilterType.ANNOTATION,classes = {
     Controller.class})
    )
public class SpringMVCConfiguration implements WebMvcConfigurer{
     
    //注解配置放行指定资源格式
//    @Override
//    public void addResourceHandlers(ResourceHandlerRegistry registry) {
     
//        registry.addResourceHandler("/img/**").addResourceLocations("/img/");
//        registry.addResourceHandler("/js/**").addResourceLocations("/js/");
//        registry.addResourceHandler("/css/**").addResourceLocations("/css/");
//    }
    //注解配置通用放行资源的格式
    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
     
        configurer.enable();
    }
}

xml配置方式（使用这种方法不报错）

• spring-mvc.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan base-package="com.yy"/>

    <mvc:resources mapping="/js/**" location="/js/"/>

    <mvc:annotation-driven/>

beans>

• web.xml

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

    <filter>
        <filter-name>CharacterEncodingFilterfilter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
        <init-param>
            <param-name>encodingparam-name>
            <param-value>UTF-8param-value>
        init-param>
    filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilterfilter-name>
        <url-pattern>/*url-pattern>
    filter-mapping>

    <servlet>
        <servlet-name>DispatcherServletservlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
        <init-param>
            <param-name>contextConfigLocationparam-name>
            <param-value>classpath*:spring-mvc.xmlparam-value>
        init-param>
    servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServletservlet-name>
        <url-pattern>/url-pattern>
    servlet-mapping>

web-app>