自定义HttpMessageConverter

本文主要是介绍自定义HttpMessageConverter，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

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<DemoObj> {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<? extends DemoObj> 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());
    }
}

添加自定义converter:

@Override
public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {converters.add(converter());
}

示例：

@Controller
public 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;
    }
}

<body>
    <div id="resp"></div><input type="button" οnclick="req();" value="请求"/>
    <script src="assets/js/jquery.js" type="text/javascript"></script>
    <script>
        function req() {$.ajax({url:"convert",
                data:"1-wangyunfei",
                type:"POST",
                contentType:"application/x-wisely",
                success:function (data) {$("#resp").html(data);
                }});
        }</script>
</body>