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配置Spring支援自動json格式資料轉換

從|Spring3.1之後,開始推薦使用RequestMappingHandlerMapping和RequestMappingHandlerAdapter來進行方法對映,

在controller裡支援使用@RequestBody註解 (從2.5開始應該就支援的)

要使用Spring提供的自動將requestbody裡的json字串的entity 轉換為對應的物件例項,

需要增加messageconverter,預設沒有MappingJackson2HttpMessageConverter

<serveletname>-servlet.xml 配置:

	<!-- ②:啟動Spring MVC的註解功能,完成請求和註解POJO的對映 -->
	<bean
		class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping">
	</bean>
	<bean
		class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
		<property name="messageConverters">
			<list>
				<bean
					class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />
			</list>
		</property>
	</bean>

並新增依賴的包:

jackson-annotations-2.0.2.jar

jackson-databind-2.0.2.jar

jackson-core-2.0.2.jar

下載地址:請搜尋我的資源分享,提供連結資源被刪~

以上是jackson最新的三個包,一個不能少,原來的1.x版本只有兩個包 (如:jackson-core-asl-1.5.6.jar      jackson-mapper-asl-1.5.6.jar)

Controller裡面的方法:

    @RequestMapping(value = "/db/addUser.do", method = RequestMethod.POST)
    @ResponseBody
    public String addUser(@RequestBody User user) {
        log.info(user.toString());
        return "success";
    }
用apache的 HttpClient包測試:
        HttpPost post = new HttpPost(URL);
        // 向伺服器寫json
        StringEntity se = new StringEntity(user, Consts.UTF_8);
        se.setContentEncoding(new BasicHeader(HTTP.CONTENT_ENCODING, Consts.UTF_8.toString()));
        se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json;charset=UTF-8"));
        post.setEntity(se);
        // post.addHeader(HTTP.CONTENT_TYPE, "application/json;charset=UTF-8");
        DefaultHttpClient client = new DefaultHttpClient();

        try {
            HttpResponse response = client.execute(post);
            System.out.println(response.getStatusLine().toString());

        } catch (ClientProtocolException e) {
            e.printStackTrace();
            post.abort();
        } catch (IOException e) {
            e.printStackTrace();
            post.abort();
        }