Could not find acceptable representation (已解决)

柔情只为你懂 2021-11-23 09:44 2651阅读 0赞

解决方案1：

@ResponseBody 方法的返回类型由JSONObject改为 Object, return时直接返回Object;

修改springmvc-servlet.xml, 增加 messageConverters








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<bean class=“org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter”>

<!— Object->json —>

<property name=“messageConverters”>

<list>

<bean class=“org.springframework.http.converter.json.MappingJacksonHttpMessageConverter” />

</list>

</property>

</bean>

需要jacksonjar包支持： jackson-core-lgpl-1.2.1.jar和 jackson-core-lgpl-1.2.1.jar。　　

解决方案2：

@ResponseBody 方法的返回类型由JSONObject改为 String, return时直接返回JSONObject.fromObject(object).toString();

此时如有中文会出现乱码，解决方法如下：








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<bean class=“org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter”>

       <!— Object->json —>

       <!— <property name=“messageConverters”> 

           <list> 

                <bean class=“org.springframework.http.converter.json.MappingJacksonHttpMessageConverter” /> 

           </list>  

       </property> —>

       <!— 默认是 ISO,此处设置编码utf-8 —>

       <property name=“messageConverters”> 

       <list> 

           <bean 

               class=“org.springframework.http.converter.StringHttpMessageConverter”> 

               <property name=“supportedMediaTypes”> 

                   <list> 

                       <bean class=“org.springframework.http.MediaType”> 

                           <constructor-arg index=“0” value=“text” /> 

                           <constructor-arg index=“1” value=“plain” /> 

                           <constructor-arg index=“2” value=“UTF-8” /> 

                       </bean> 

                   </list> 

               </property> 

           </bean> 

       </list> 

   </property> 

   </bean>

　　

解决方案3：

返回类型为JSONObject, 编写一个自己converter.








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package javacommon.util;

 

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.nio.charset.Charset;

 

import org.springframework.http.HttpInputMessage;

import org.springframework.http.HttpOutputMessage;

import org.springframework.http.MediaType;

import org.springframework.http.converter.AbstractHttpMessageConverter;

import org.springframework.http.converter.HttpMessageNotReadableException;

import org.springframework.http.converter.HttpMessageNotWritableException;

 

public class JaksonConverter extends AbstractHttpMessageConverter<Object> {

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

     

    public JaksonConverter() {

        super(new MediaType(“application”, “json”, DEFAULT_CHARSET));

    }

     

    @Override

    protected boolean supports(Class<?> clazz) {

        // TODO Auto-generated method stub

        return false;

    }

 

    @Override

    protected Object readInternal(Class<? extends Object> clazz,

            HttpInputMessage inputMessage) throws IOException,

            HttpMessageNotReadableException {

        logger.info(clazz.getSimpleName());

        InputStream inputStream=inputMessage.getBody();

        StringBuilder stringBuilder = new StringBuilder();

        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));

        String line = null;

        while((line = bufferedReader.readLine()) != null){

            stringBuilder.append(line);

        }

        logger.info(stringBuilder.toString());

        return stringBuilder;

    }

 

    @Override

    protected void writeInternal(Object t, HttpOutputMessage outputMessage)

            throws IOException, HttpMessageNotWritableException {

        logger.info(t.getClass().getSimpleName());

         

        // HashMap

        // JSONObject

        logger.info(t.toString());

        OutputStream os=outputMessage.getBody();

          

        os.write(t.toString().getBytes(“utf-8”));

        os.flush();

         

    }

}

VB恩文转自：https://www.cnblogs.com/leegtang/articles/4463178.html

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