JSON data interaction

1.1.@RequestBody

Role:

@RequestBody annotations are used to read The contents of an HTTP request ( string )by Springmvc provided by Httpmessageconverter The content that the interface will read ( JSON data) is converted to Java object and bind to the Controller the parameters of the method.

Traditional Request Parameters :

Itemedit.action?id=1&name=zhangsan&age=12

Now the request parameter:

Use POST request, adding JSON data to the request body

{"id": 1,"name": "Test Commodity","price": 99.9,"detail": "Test Product description","pic": " 123456.jpg "}

This example applies:

@RequestBody Annotations Implement JSON data that receives HTTP requests , converting the JSON data to Java objects are bound

1.2.@ResponseBody

Role:

@ResponseBody annotations The object that is used to return the Controller 's method through the SPRINGMVC provided by the Httpmessageconverter interface to the specified format of data such as:json,xml , etc., by Response response to the client

This example applies:

The @ResponseBody annotation implementation converts the Controller method return Java object to a JSON response to the client.

1.3. Request JSON, in response to JSON implementations:

1.3.1. Add a jar package

If you need SPRINGMVC support json, you must include the JSON processing jar

we use Jackson This jar, such as:

1.3.2.Itemcontroller Writing

@RequestMapping ("Testjson")//  @ResponseBody public @ResponseBody Item Testjson (@RequestBody item Item) {    return  item;}

1.3.3. Configuring The JSON converter

if without using annotations to drive <mvc:annotation-driven/>, you need to configure a JSON converter for the processor adapter , referencing the custom parameter bindings previously learned.

in the springmvc.xml configuration file, add the JSON converter to the processor adapter:

<!--processor adapter--    class= " Org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter ">        <property name=" Messageconverters ">        <list>        class=" Org.springframework.http.converter.json.MappingJacksonHttpMessageConverter "></bean>        </list >        </property>    </bean>

JSON data interaction