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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class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> "messageConverters"> class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />

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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class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">                                "messageConverters">                                      class="org.springframework.http.converter.StringHttpMessageConverter">                 "supportedMediaTypes">                                              class="org.springframework.http.MediaType">                             "0" value="text" />                             "1" value="plain" />                             "2" value="UTF-8" />

　　

 

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

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