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HttpMessageConverter是用来处理request和response里的数据的，我们可以自定义，用于类型转换。

自定义对象和字符串之间的转换：

public class MyMessageConverter extends AbstractHttpMessageConverter
   
     {    public MyMessageConverter(){        //设置我们新定义的媒体类型为application/x-wisely        super(new MediaType("application","x-wisely", Charset.forName("UTF-8")));    }    //标明本HttpMessageConverter只处理DemoObj这个类    @Override    protected boolean supports(Class
     aClass) {        return DemoObj.class.isAssignableFrom(aClass);    }    //把中间用-隔开的数据转成DemoObj对象    @Override    protected DemoObj readInternal(Class
     aClass, HttpInputMessage httpInputMessage) throws IOException, HttpMessageNotReadableException {        String temp= StreamUtils.copyToString(httpInputMessage.getBody(),Charset.forName("UTF-8"));        String[] tempArr=temp.split("-");        return new DemoObj(new Long(tempArr[0]),tempArr[1]);    }    //把DemoObj对象转化成字符串并输出到response中    @Override    protected void writeInternal(DemoObj obj, HttpOutputMessage httpOutputMessage) throws IOException, HttpMessageNotWritableException {        String out="hello:"+obj.getId()+"-"+obj.getName();        httpOutputMessage.getBody().write(out.getBytes());    }}
   

@Overridepublic void extendMessageConverters(List
   
    > converters) {    converters.add(converter());}
   

@Controllerpublic class ConverterController {    //接收字符串转化为对象，然后把对象又转化为字符串输出。    @RequestMapping(value="/convert",produces = {
 "application/x-wisely"})    public @ResponseBody DemoObj convert(@RequestBody DemoObj demoObj){        return demoObj;    }}

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