@RequestMapping(value = "j1",produces = "application/json;charset=utf-8")

註解中加入produces的編碼解釋

package wsh.controller;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
 
import org.springframework.web.bind.annotation.ResponseBody;
import wsh.pojo.User;

@Controller
public class userController {
    @RequestMapping(value = "j1",produces = "application/json;charset=utf-8")
    @ResponseBody
    public String json01() throws JsonProcessingException {
        ObjectMapper mapper
 
=new ObjectMapper();
        User user=new User("版本",11,"貓貓");
        String str=mapper.writeValueAsString(user);
        return str;
    }
}

2.在springMVC配置檔案中做亂碼統一處理

mvc:annotation-driven

標籤內既是亂碼處理官方方式

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
">
    <context:component-scan base-package="wsh.controller"/>
    <mvc:default-servlet-handler/>
    <mvc:annotation-driven>
        <mvc:message-converters>
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="defaultCharset" value="utf-8"/>
            </bean>
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <property name="objectMapper">
                    <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
                        <property name="failOnEmptyBeans" value="false"/>
                    </bean>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          id="internalResourceViewResolver">
        <property name="prefix" value="/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

處理效果