playframework2框架介绍

1.play项目的结构

　　app中主要的包有controllers,filters,models,service,utils.

• 其中controllers是控制器，相当于springMVC中的Controller
• filter是拦截器，可以理解为springMVC中的HandlerInterceptor
• models相当去SSM框架的dao层，持久层
• services相当于SSM框架的service层，业务层

　　conf的文件主要有mysql.conf,application.conf,routes;

• mysql.conf主要配置一些与MySQL数据库有关的设置
• application.conf配置一些redis，cache,h2db之类的配置
• routes这个配置文件相当去springmvc的前端处理器，比如

　　POST 　　 /v1/tasks/:taskId/reward 　　controllers.TaskApplicantsController.reward(taskId : Int)

　　分别对应http方法   url    类中的方法

　　play2框架的构建工具用的是sbt，build.sbt是其构建工具

2.play框架的增删改查

• 增

     @Inject
      private MyCacheApi cache; 
  public Result create() {
          JsonNode body = request().body().asJson();
          String title = ApplicationHelper.getParamsInPath(body, Constants.TITLE, true);
          Users user = Users.getUser(cache.getUserId(request()));
          try {
              checkPermission(user);
          } catch (Exception e) {
              return badRequest(ApplicationHelper.getErrorJson(CodeConstants.INVALID_PARAM_ERROR,
                      e.getMessage()));
          }
          Council council = new Council();
          council.setTitle(title);
          council.insert();
          return ok(Json.toJson(council));
      }

• 删

• public Result delete(int sectionId) {
      Sections sections = Sections.getSection(sectionId);
      if (sections != null) {
          sections.delete();
      }
      return ok();
  }

• 改

• public Result update(Integer councilId) {
      JsonNode body = request().body().asJson();
      String title = null;
      try {
          title = ApplicationHelper.getParamsInPath(body, Constants.TITLE, true);
      } catch (Exception e) {
          return badRequest(ApplicationHelper.getErrorJson(CodeConstants.INVALID_PARAM_ERROR,
                  e.getMessage()));
      }
  
      Council council = Council.get(councilId);
      council.setTitle(title);
      council.update();
      return ok(Json.toJson(council));
  }

• 查

• public Result get(Integer level) {
      Levels levels = Levels.get(level);
      try {
          return ok(Json.toJson(levels));
      } catch (Exception e) {
          return badRequest(ApplicationHelper.getErrorJson(CodeConstants.INVALID_PARAM_ERROR,
                  e.getMessage()));
      }
  }