springboot的controller文件中的函数使用switch示例
时间: 2023-11-22 22:55:36 浏览: 35
以下是一个使用switch语句的Spring Boot Controller示例:
```java
@RestController
public class UserController {
@GetMapping("/users/{id}")
public ResponseEntity getUser(@PathVariable Long id) {
User user = null;
switch (id.intValue()) {
case 1:
user = new User(1L, "John", "Doe");
break;
case 2:
user = new User(2L, "Jane", "Doe");
break;
default:
return ResponseEntity.notFound().build();
}
return ResponseEntity.ok(user);
}
}
```
在上面的示例中,我们使用了HTTP GET请求来获取用户的数据。根据传入的用户ID,我们使用switch语句来返回相应的用户数据。如果传入的ID不是1或2,则返回404 Not Found响应。
相关问题
receiveCANmsgsTimerCallback(app)的函数应该如何写
receiveCANmsgsTimerCallback(app)函数应该按照以下步骤编写:
1. 从CAN总线接收消息,可以使用MATLAB的CAN(Controller Area Network)接口对象来实现。
2. 对于每个接收到的消息,提取出ID、数据和时间戳等信息。
3. 根据消息的ID和数据内容,进行相应的处理,例如进行数据解析或者将数据存储到文件中等。
4. 如果需要在界面上显示接收到的消息,可以通过app对象的属性或方法来实现,例如使用MATLAB的uitable控件或者plot函数等。
下面是一个简单的示例代码:
```
function receiveCANmsgsTimerCallback(app)
% 从CAN总线接收消息
canMsg = receive(app.canInterface);
% 提取出ID、数据和时间戳等信息
id = canMsg.ID;
data = canMsg.Data;
timestamp = canMsg.Timestamp;
% 根据消息的ID和数据内容,进行相应的处理
switch id
case 1
% 处理ID为1的消息
...
case 2
% 处理ID为2的消息
...
otherwise
% 处理其他ID的消息
...
end
% 在界面上显示接收到的消息
app.updateCANmsgsTable(id, data, timestamp);
end
```
其中,`app.canInterface`是一个CAN接口对象,`app.updateCANmsgsTable`是一个更新界面上消息表格的方法。需要根据实际情况进行修改和完善。
请给出一个moveit控制器的代码示例
以下是一个基于MoveIt Simple Controller Manager的ROS控制器示例:
```cpp
#include <ros/ros.h>
#include <moveit_simple_controller_manager/simple_controller_manager.h>
#include <moveit/move_group_interface/move_group_interface.h>
#include <moveit/robot_model_loader/robot_model_loader.h>
#include <moveit/robot_model/robot_model.h>
#include <moveit/robot_state/robot_state.h>
#include <moveit/trajectory_processing/iterative_time_parameterization.h>
class MyRobotController : public moveit_simple_controller_manager::SimpleControllerManager
{
public:
MyRobotController() : moveit_simple_controller_manager::SimpleControllerManager()
{
// Initialize MoveIt
move_group_.reset(new moveit::planning_interface::MoveGroupInterface("arm"));
// Load the robot model and get the robot state
robot_model_loader_.reset(new robot_model_loader::RobotModelLoader("robot_description"));
robot_model_ = robot_model_loader_->getModel();
robot_state_.reset(new robot_state::RobotState(robot_model_));
// Set the joint model group
joint_model_group_ = robot_model_->getJointModelGroup("arm");
// Set the trajectory processing
trajectory_processing_.reset(new trajectory_processing::IterativeParabolicTimeParameterization());
// Set the desired joint state
desired_joint_state_.resize(joint_model_group_->getVariableCount());
desired_joint_state_.setZero();
}
virtual bool initialize(const std::string& robot_description, const std::string& controller_name)
{
// Initialize the controller with the robot description and the controller name
if (!SimpleControllerManager::initialize(robot_description, controller_name))
{
ROS_ERROR("Failed to initialize the controller");
return false;
}
// Set the callback function for the controller
controller_->setTrajectoryExecutionCallback(boost::bind(&MyRobotController::trajectoryExecutionCallback, this, _1));
// Print a message to indicate successful initialization
ROS_INFO("Controller initialized successfully");
return true;
}
virtual bool canSwitch(const std::vector<std::string>& start_controllers, const std::vector<std::string>& stop_controllers) const
{
// This controller does not support switching
return false;
}
virtual bool switchControllers(const std::vector<std::string>& start_controllers, const std::vector<std::string>& stop_controllers)
{
// This controller does not support switching
return false;
}
virtual bool isActive()
{
// Return true if the controller is active
return controller_->isActive();
}
virtual void stopping()
{
// Stop the controller
controller_->stop();
}
void trajectoryExecutionCallback(const moveit_msgs::RobotTrajectory& trajectory)
{
// Get the start state of the robot
robot_state_->setToDefaultValues();
const robot_state::JointModelGroup* start_joint_model_group = robot_state_->getJointModelGroup("arm");
// Get the start and end time of the trajectory
double start_time = ros::Time::now().toSec();
double end_time = start_time + trajectory.joint_trajectory.points.back().time_from_start.toSec();
// Execute the trajectory
move_group_->execute(trajectory);
// Wait until the end of the trajectory
while (ros::Time::now().toSec() < end_time)
{
ros::Duration(0.01).sleep();
}
// Get the current joint state of the robot
robot_state_->getCurrentState(*move_group_->getCurrentState());
const robot_state::JointModelGroup* current_joint_model_group = robot_state_->getJointModelGroup("arm");
// Get the current joint values
robot_state_->copyJointGroupPositions(current_joint_model_group, desired_joint_state_);
// Set the current joint values as the desired joint state
controller_->setDesiredJointState(desired_joint_state_);
// Print a message to indicate successful trajectory execution
ROS_INFO("Trajectory executed successfully");
}
private:
ros::NodeHandle nh_;
moveit::planning_interface::MoveGroupInterfacePtr move_group_;
robot_model_loader::RobotModelLoaderPtr robot_model_loader_;
robot_model::RobotModelPtr robot_model_;
robot_state::RobotStatePtr robot_state_;
const robot_model::JointModelGroup* joint_model_group_;
std::unique_ptr<trajectory_processing::IterativeParabolicTimeParameterization> trajectory_processing_;
Eigen::VectorXd desired_joint_state_;
};
int main(int argc, char** argv)
{
// Initialize ROS
ros::init(argc, argv, "my_robot_controller");
// Create the controller
MyRobotController controller;
// Initialize the controller
if (!controller.initialize("robot_description", "my_robot_controller"))
{
return -1;
}
// Spin the node
ros::spin();
return 0;
}
```
在上述示例中,MyRobotController是一个自定义的ROS控制器,它继承自MoveIt Simple Controller Manager。在构造函数中,我们初始化了MoveIt,加载了机器人模型,并设置了轨迹处理和期望关节状态。在initialize()函数中,我们初始化了控制器,并设置了回调函数。在trajectoryExecutionCallback()函数中,我们执行了轨迹,并在轨迹执行完成后更新了期望关节状态。最后,在main()函数中,我们创建了并初始化了控制器,并开始运行ROS节点。