解決低版本spring中StringHttpMessageConverter中文亂碼問題

項目架構比較老舊，spirng用的3.0.2，在使用@ResponseBody String做返回值的接口時，若客戶端不做處理，Content-Type默認爲text/plain;charset=ISO-8859-1，導致的問題是中文會顯示亂碼，變成???問號。

 

查閱資料發現有以下幾種解決方案：

1. 在@RequestMapping裏面加入produces = "text/html;charset=UTF-8"

@RequestMapping(value = "/getAllTask", method = RequestMethod. POST, produces = "text/plain;charset=UTF-8") 

public @ResponseBody String getAllTask(HttpServletRequest request,HttpServletResponse response)

2、XML配置

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <!-- String 轉換器 -->
               <ref bean="stringHttpMessageConverter"/>
                <!-- JSON 轉換器 -->
                <ref bean="jsonHttpMessageConverter"/>
                <!-- XML 轉換器 -->
            </list>
        </property>
    </bean>
    
    <!-- <bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter"/> -->

    <bean id="jsonHttpMessageConverter"
          class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
        <property name = "supportedMediaTypes">
             <list>
                 <value>text/html;charset=UTF-8</value>  
                 <value>text/plain;charset=UTF-8</value>  
            </list>   
       </property>   
    </bean>
     <bean id="stringHttpMessageConverter"
          class="org.springframework.http.converter.StringHttpMessageConverter">
        <property name = "supportedMediaTypes">
             <list>
            	 <value>text/html;charset=UTF-8</value> 
                 <value>text/plain;charset=UTF-8</value>   
            </list>   
       </property> 
       </bean>

3、因爲在StringHttpMessageConverter裏面默認設置了字符集是ISO-8859-1

所以找源代碼，修改成UTF-8並打包到spring-web jar裏

public class StringHttpMessageConverter extends AbstractHttpMessageConverter<String> 

{ 

  public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8"); 

  .......... 

} 

4、直接將org.springframework.http.converter.StringHttpMessageConverter 裏面的屬性defaultCharset設置成utf-8

<bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter"> 

<constructor-arg value="UTF-8" />

</bean>

spring版本低的用不了配置的方式，於是選用了第三種方式，問題解決