java如何获取映射URL的JSON结果

Question

假设我们有以下控制器

@Controller
@RequestMapping("/Index")
public class ControllerClass {

  @RequestMapping("/Result")
  @ResponseBody
  public List<Integer> result(){
     List<Integer> result = new ArrayList<Integer>();
     result.add(1);
     result.add(2);
     return result;
  }
 }

现在我想将URL“/Index/result”的JSON结果存储到一个字符串中。或者简单地说，在应用注释后存储controller的JSON结果。请注意，它不是用于测试的，为此目的考虑的webservice问题。有什么想法吗？ 提前谢谢

Answer 1

我建议在你的pom中加入jackson依赖项。xml，如果它们还不存在的话

<dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.2.3</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.2.3</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>2.2.3</version>
    </dependency>

您还可以像这样更新请求映射

@RequestMapping(value = "/Result", produces = "application/json;charset=utf-8")

Answer 2

在通过ResponseEntity返回之前，可以将Jackson的ObjectMapper注入控制器，以手动将结果序列化到JSON

@Configuration
public class Config {

     @Bean
     public ObjectMapper objectMapper() {
         // returning a plain ObjectMapper, 
         // you can change this to configure the ObjectMapper as requiered
         return new ObjectMapper();
     }
}


@Controller
@RequestMapping("/Index")
 public class ControllerClass {

   @Autowired
   private ObjectMapper objectMapper;

   @RequestMapping(value="/Result", 
                   method=RequestMethod.GET, 
                   produces="application/json")
   @ResponseBody
   public ResponseEntity<String> result(){
     List<Integer> result = new ArrayList<Integer>();
     result.add(1);
     result.add(2);
     String jsonResult = objectMapper.writer().writeValueAsString(result);
     // here you can store the json result before returning it;
     return new ResponseEntity<String>(jsonResult, HttpStatus.OK);
   }
}

编辑：

您还可以尝试定义一个HandlerInterceptor来捕获您感兴趣的请求的响应主体

@Component
public class RestResponseInterceptor implements HandlerInterceptor {

      public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
          // inspect response, etc...
     }
}