Several methods to solve SpringMvc background receiving json data Chinese garbled code problem

1, When using ajax to transfer data from the foreground page to the background controller controller, Chinese garbled code (question mark???) appears. .

I found various solutions on the Internet before, but none worked. Finally, I found that the tomcat server was having problems receiving data

Solution:

Option 1: Transcode the parameters when they are received by controller

@ResponseBody
@RequestMapping(value="/getJsonDataByCityName",produces="application/json")
public String getJsonByName(HttpServletRequest request,HttpServletResponse response,@RequestParam String city_name)throws ServletException,IOException
{
  //response.setContentType("text/html;charset=UTF-8");

  //request.setCharacterEncoding("UTF-8");// To solve post The code problem 
  System.out.println(request.getCharacterEncoding());
  city_name = new String(city_name.getBytes("ISO-8859-1"), "UTF-8");
  System.out.println("city_name:"+city_name);
}

Method 2:

Configure the service.xml file in the tomcat directory

tomcat7/conf/server.xml

Add the encoding attribute URIEncoding=" UTF-8 "to this line of code

<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" URIEncoding="UTF-8" />

Reason analysis:

In fact, the cause of garbled code problem is due to the default tomcat configuration, receiving the request is ISO-8859-1 to transcode, resulting in Chinese garbled problem, as long as the correct utf-8 to transcode, can solve the garbled problem.

2. General data transmission, from jsp page to background controller, Chinese garbled code solution

(1) First, check whether the jsp page encoding format is utf-8

(2) Set Chinese filtering

<!--  Chinese code  -->
  <filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

(3) Set JSON data conversion in springMvc configuration file

<mvc:annotation-driven>
  <mvc:message-converters register-defaults="true">
    <!--  Start the Spring MVC The annotation function completes the request and annotation POJO The mapping of   Annotation request mapping 
     The default is ISO-88859-1 , avoid garbled code here set to UTF-8 -->
    <bean class="org.springframework.http.converter.StringHttpMessageConverter">
      <property name="supportedMediaTypes" value="text/html;charset=UTF-8" />
    </bean>
    <!--  Start the JSON Configuration of format , Automatically converts the format to JSON Format, no other classes are required  -->
    <bean id="jacksonMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
      <property name="supportedMediaTypes" value="application/json;charset=UTF-8" />
    </bean>
  </mvc:message-converters>
</mvc:annotation-driven>