Question

请求参数是json springmvc 怎么注解

Answer 1

解决方案：
类似于之前写的《扩展SpringMVC以支持更精准的数据绑定》，扩展spring的HandlerMethodArgumentResolver以支持自定义的数据绑定方式。

1、请下载附件的代码，放到工程中；
2、在RequestMappingHandlerAdapter添加自定义HandlerMethodArgumentResolver Bean；
Java代码
<span style="font-size: x-small;"> <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<!--线程安全的访问session-->
<property name="synchronizeOnSession" value="true"/>
<property name="customArgumentResolvers">
<list>
<bean class="cn.javass.spring.mvc.method.annotation.RequestJsonParamMethodArgumentResolver"/>
<bean class="cn.javass.spring.mvc.method.annotation.FormModelMethodArgumentResolver"/>
</list>
</property>
</bean> </span>
//customArgumentResolvers用于注入自定义的参数解析器，此处我们注入了RequestJsonParamMethodArgumentResolver。
3、使用方式
Java代码
<span style="font-size: x-small;">@RequestMapping("/list")
public String list(@RequestJsonParam("list") List<Integer> list) </span>

4、测试控制器
Java代码
<span style="font-size: x-small;">package cn.javass.chapter6.web.controller.jsonparam;

import java.util.Arrays;
import java.util.List;
import java.util.Set;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import cn.javass.chapter6.model.DataBinderTestModel;
import cn.javass.chapter6.model.UserModel;
import cn.javass.spring.mvc.bind.annotation.RequestJsonParam;
import cn.javass.spring.mvc.util.MapWapper;

@Controller
@RequestMapping("/jsonparam")
public class JsonParamController {

//ok http://localhost:9080/springmvc-chapter6/jsonparam/list?list=[1,2,34]
//fail http://localhost:9080/springmvc-chapter6/jsonparam/list?list=[1,2,a]
@RequestMapping("/list")
public String list(@RequestJsonParam("list") List<Integer> list) {
System.out.println(list);
return "redirect:/success";
}

//ok http://localhost:9080/springmvc-chapter6/jsonparam/set?set=[1,2,34]
//fail http://localhost:9080/springmvc-chapter6/jsonparam/set?set=[1,2,a]
@RequestMapping("/set")
public String set(@RequestJsonParam("set") Set<Integer> set) {
System.out.println(set);
return "redirect:/success";
}

//ok http://localhost:9080/springmvc-chapter6/jsonparam/array?array=[1,2,3]
//fail http://localhost:9080/springmvc-chapter6/jsonparam/array?array=[1,2,a]
@RequestMapping("/array")
public String list(@RequestJsonParam("array") int[] array) {
System.out.println(Arrays.toString(array));
return "redirect:/success";
}

//ok http://localhost:9080/springmvc-chapter6/jsonparam/map?map={"a":1, "b":2}
//fail http://localhost:9080/springmvc-chapter6/jsonparam/map?map={"a":1, "b":a}
@RequestMapping("/map")
public String map(@RequestJsonParam(value = "map", required=false) MapWapper<String, Integer> map) {
System.out.println(map);
return "redirect:/success";
}

//UserModel[]
//ok http://localhost:9080/springmvc-chapter6/jsonparam/array2?array=[{"username":"123"},{"username":"234"}]
@RequestMapping("/array2")
public String array2(@RequestJsonParam(value = "array") UserModel[] array) {
System.out.println(Arrays.toString(array));
return "redirect:/success";
}

//List<UserModel>
//ok http://localhost:9080/springmvc-chapter6/jsonparam/list2?list=[{"username":"123"},{"username":"234"}]
@RequestMapping("/list2")
public String list2(@RequestJsonParam(value = "list") List<UserModel> list) {
System.out.println(list);
return "redirect:/success";
}

//Set<UserModel>
//ok http://localhost:9080/springmvc-chapter6/jsonparam/set2?set=[{"username":"123"},{"username":"234"}]
@RequestMapping("/set2")
public String set2(@RequestJsonParam(value = "set") Set<UserModel> set) {
System.out.println(set);
return "redirect:/success";
}

//Map<String, UserModel>
//ok http://localhost:9080/springmvc-chapter6/jsonparam/map2?map={"a":{"username":"123"},"b":{"username":"234"}}
//暂不支持 Map<UserModel, UserModel>
@RequestMapping("/map2")
public String map2(@RequestJsonParam(value = "map") MapWapper<String, UserModel> map) {
System.out.println(map);
return "redirect:/success";
}

//ok http://localhost:9080/springmvc-chapter6/jsonparam/model1?model={"username":123,"password":234,"realname":"zhang","workInfo":{"city":"abc","job":"abc","year":"abc"}, "schoolInfo":{"schoolType":"1","schoolName":"1","specialty":"1"}}
//没有realname1
//fail http://localhost:9080/springmvc-chapter6/jsonparam/model1?model={"username":123,"password":234,"realname1":123}
@RequestMapping("/model1")
public String model1(@RequestJsonParam(value = "model", required=true) UserModel user) {
System.out.println(user);
return "redirect:/success";
}

//ENUM
//ok http://localhost:9080/springmvc-chapter6/jsonparam/model2?model={"state":"normal"}
//List<基本类型>
//ok http://localhost:9080/springmvc-chapter6/jsonparam/model2?model={"hobbyList":["film", "music"]}
//Map<基本类型，基本类型>
//ok http://localhost:9080/springmvc-chapter6/jsonparam/model2?model={"map":{"key":"value", "a":"b"}}
@RequestMapping("/model2")
public String model2(@RequestJsonParam(value = "model", required=true) DataBinderTestModel model) {
System.out.println(model);
return "redirect:/success";
}

//List<UserModel>
//ok http://localhost:9080/springmvc-chapter6/jsonparam/model3?model={"userList":[{"username":"1"},{"username":"2"}]}
//Map<String，UserModel>
//ok http://localhost:9080/springmvc-chapter6/jsonparam/model3?model={"userMap":{"1":{"username":"1"},"2":{"username":"2"}}}

//暂不支持 类似于 Map<UserModel, UserModel> 形式
@RequestMapping("/model3")
public String model3(@RequestJsonParam(value = "model") DataBinderTestModel model) {
System.out.println(model);
return "redirect:/success";
}

}
</span>

支持的spring版本：
springmvc 3.0 和 3.1.x。

支持绑定的数据：
模型、集合、数组、MapWapper（Map的一个包装器，通过getInnerMap获取真实Map）