建立自定義類

根據專案需要定義成員變數

public class AkResponse implements Serializable {
    private String msg;
    private String code;
    private Object data;
    private Boolean succ;

    public static AkResponse genSucc(Object data) {
        AkResponse a = new AkResponse();
        a.setSucc(true);
        a.setCode("1"
 
);
        a.setMsg("success");
        a.setData(data);
        return a;
    }

    public static AkResponse genFail(Exception e) {
        AkResponse a = new AkResponse();
        a.setSucc(false);
        a.setMsg(e.getMessage());
        a.setCode("0");
        return a;
    }
    //getter,setter
}
 

建立自定義的converter

public class AkResponseConverter extends AbstractHttpMessageConverter<AkResponse> {
    /**字元編碼utf-8*/
    public final static Charset UTF8 = Charset.forName("UTF-8");
    private Charset charset = UTF8;
    public AkResponseConverter() {
        super(new MediaType("application"
 
, "json", UTF8), new MediaType("application", "*+json", UTF8));
    }

    /**判斷是否是支援的型別*/
    @Override
    protected boolean supports(Class<?> clazz) {
        if (clazz.equals(AkResponse.class)) {
            return true;
        }
        return false;
    }

    @Override
    protected AkResponse readInternal(Class<? extends AkResponse> clazz, HttpInputMessage inputMessage)
            throws IOException, HttpMessageNotReadableException {
        //沒有處理使用者的傳送過來的請求
        return null;
    }

    @Override
    protected void writeInternal(AkResponse obj, HttpOutputMessage outputMessage) throws IOException,
            HttpMessageNotWritableException {
        OutputStream out = outputMessage.getBody();
        String text = null;
        if (null != obj) {
            //將obj轉為json字串
            text = JSONObject.fromObject(obj).toString();
            byte[] bytes = text.getBytes(charset);
            //輸出到out
            out.write(bytes);
        }
    }

}

在spring-mvc.xml中對自定義的converter進行設定

<mvc:annotation-driven>
    <mvc:message-converters>
        .......
        <bean class="cn.akioyuan.core.converter.AkResponseConverter" />
    </mvc:message-converters>
</mvc:annotation-driven>

在Controller中返回自定義型別

必須新增@ResponseBody註解

@Controller
@RequestMapping(value = "/member")
public class MemberController extends BaseController {
    ......
    @RequestMapping(value = "/all")
    @ResponseBody
    public AkResponse all() {
        try {
            Map<String, List<CourseDto>> map = courseService.listAll();
            return AkResponse.genSucc(map);
        } catch (Exception e) {
            return AkResponse.genFail(e);
        }
    }
    ......
}

伺服器返回的資料

{"code":"1","data":{......},"msg":"success","succ":true}

頁面處理返回值

<script>
$.ajax({
    url : '.....',
    dataType : 'json',
    type : 'POST',
    beforeSend : function() {
        ......
    },
    success : function(data) {
            if (data.succ) {
                data = data.data;
                $.each(data,function(i, v) {
                    console.log(i + '->' + v);
                    ......
                });
                .......
            }
    },
    error : function() {
    }
});
</script>

小結

感覺比在Controller中直接返回JSONObject要高大上那麼一點點。