Could not find acceptable representation (已解决)

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