JsonBody的使用

最新推荐文章于 2025-04-19 21:48:24 发布

转载最新推荐文章于 2025-04-19 21:48:24 发布

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@Controller
@RequestMapping("/house/rent")
public class RentInfoController {
    @Resource
    RentInfoService rentInfoService;
    Logger logger = LoggerFactory.getLogger(RentInfoController.class);

    @RequestMapping("/add")
    @JsonBody
    /**
     *添加发布信息
     */
    public Object addRentInfo(RentInfo rentInfo,Model model)  {
        try{
            rentInfo.setPostTime(new Date());
            rentInfo.setUserId(1);
             rentInfoService.insertRentInfo(rentInfo);
        }catch (Exception e){
         logger.error("添加异常",e);
            return  JsonResult.getErrorMessage(-1,"发布信息添加失败！");
        }
         model.addAttribute("id", rentInfo.getId());
        return "redirect:/house/rent/select/rentinfo";
    }
}

添加成功后跳转。使用了@JsonBody标签，addRentInfo()的返回值类型定义为Object。

JsonResult类的定义：

/*生成Json串*/
public class JsonResult {

    /**
     * 返回错误状态的json串
     *
     * @param status  错误代码，非零数值
     * @param message 错误消息
     * @return CodeMessage
     */
    public static CodeMessage getErrorMessage(final int status, final String message) {
        return new CodeMessage() {
            @Override
            public int getStatus() {
                return status;
            }

            @Override
            public String getMessage() {
                return message;
            }

            @Override
            public Object getData() {
                return null;
            }
        };
    }

    /**
     * 返回成功状态的json串
     *
     * @param data 成功时返回的数据
     * @return CodeMessage
     */
    public static CodeMessage getSuccessMessage(final Object data) {
        return new CodeMessage() {
            @Override
            public int getStatus() {
                return 0;
            }

            @Override
            public String getMessage() {
                return null;
            }

            @Override
            public Object getData() {
                return data;
            }
        };
    }

}

接口CodeMessage的定义：

public interface CodeMessage {
    int OK = 0;
    int SYSTEM_ERROR = -1;

    int getStatus();

    java.lang.String getMessage();

    java.lang.Object getData();
}

说明：之所以定义CodeMessage接口是为了统一一个公司的标准;JsonResult中定义了两个静态方法：getErrorMessage()和getSuccessMessage()来返回统一格式的JsonResult。JsonBody是公司自定义的一个标准，用@JsonBody注解后，方法返回值默认为CodeMessage接口的实现。

测试：

@Controller
@RequestMapping("/test")
public class TestController {

    static final Logger logger = LoggerFactory.getLogger(UserController.class);

    @RequestMapping(value = "/json")
    @JsonBody
    public Object findPassword() {
        logger.info("=======================================");
        User user = new User();
        user.setName("tom");
        return JsonResult.getErrorMessage(1,"user");
    }
}

return JsonResult.getErrorMessage(1,"user");

返回的Json格式为：{"status":1,"message":"user","data":null}

return JsonResult.getSuccessMessage(user);

返回的Json格式为：

{"status":0,"message":null,"data":{"id":null,"username":null,"password":null,"token":null,"mac":null,"name":"tom","createTime":null,"lastLogin":null,"phone":null,"gender":null,"dept":null,"qq":null,"rtx":null,"coEmail":null,"userEmail":null,"hometown":null,"hobby":null,"headPhoto":null,"houseStatus":null,"area":null,"address":null,"desc":null,"status":null}}

return user;

返回的Json格式为：

当我们把JsonBody的注解去掉后，系统将按照web.xml中配置的那样去查找相关的jsp页面：

HTTP Status 404 - /WEB-INF/jsp/test/json.jsp

采用ResponseBody注解后：

return user;

返回json数据格式：{"id":null,"username":null,"password":null,"token":null,"mac":null,"name":"tom","createTime":null,"lastLogin":null,"phone":null,"gender":null,"dept":null,"qq":null,"rtx":null,"coEmail":null,"userEmail":null,"hometown":null,"hobby":null,"headPhoto":null,"houseStatus":null,"area":null,"address":null,"desc":null,"status":null}

执行：

return JsonResult.getSuccessMessage(user);

返回格式为：

{"message":null,"data":{"id":null,"username":null,"password":null,"token":null,"mac":null,"name":"tom","createTime":null,"lastLogin":null,"phone":null,"gender":null,"dept":null,"qq":null,"rtx":null,"coEmail":null,"userEmail":null,"hometown":null,"hobby":null,"headPhoto":null,"houseStatus":null,"area":null,"address":null,"desc":null,"status":null},"status":0}

我们发现：其实就是返回一个普通的CodeMessage对象。如果使用@JsonBody，则返回另一种统一规范的json对象。