spring3.0.5 Could not find acceptable representation解决方案

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在使用spring3.0.5 mvc开发时，进行json接口数据开发，使用JSONObject.fromObject(object)返回json数据。遇到“org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation”错误。

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








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：

解决方案3：

返回类型为JSONObject, 编写一个自己converter.

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 {
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();
    // hello

}

}

将方案1中的converter换成编写的即可。

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