SpringMvc RestFul风格的请求以及拦截器
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2022-07-15 15:41:59
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import java.util.Map;
import javax.validation.Valid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.Errors;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import com.atguigu.springmvc.crud.dao.DepartmentDao;
import com.atguigu.springmvc.crud.dao.EmployeeDao;
import com.atguigu.springmvc.crud.entities.Employee;
@Controller
public class EmployeeHandler {
@Autowired
private EmployeeDao employeeDao;
@Autowired
private DepartmentDao departmentDao;
@ModelAttribute
public void getEmployee(@RequestParam(value="id",required=false) Integer id,
Map<String, Object> map){
if(id != null){
map.put("employee", employeeDao.get(id));
}
}
@RequestMapping(value="/emp", method=RequestMethod.PUT)
public String update(Employee employee){
employeeDao.save(employee);
return "redirect:/emps";
}
@RequestMapping(value="/emp/{id}", method=RequestMethod.GET)
public String input(@PathVariable("id") Integer id, Map<String, Object> map){
map.put("employee", employeeDao.get(id));
map.put("departments", departmentDao.getDepartments());
return "input";
}
@RequestMapping(value="/emp/{id}", method=RequestMethod.DELETE)
public String delete(@PathVariable("id") Integer id){
employeeDao.delete(id);
return "redirect:/emps";
}
@RequestMapping(value="/emp", method=RequestMethod.POST)
public String save(@Valid Employee employee, Errors result,
Map<String, Object> map){
System.out.println("save: " + employee);
if(result.getErrorCount() > 0){
System.out.println("出错了!");
for(FieldError error:result.getFieldErrors()){
System.out.println(error.getField() + ":" + error.getDefaultMessage());
}
//若验证出错, 则转向定制的页面
map.put("departments", departmentDao.getDepartments());
return "input";
}
employeeDao.save(employee);
return "redirect:/emps";
}
@RequestMapping(value="/emp", method=RequestMethod.GET)
public String input(Map<String, Object> map){
map.put("departments", departmentDao.getDepartments());
map.put("employee", new Employee());
return "input";
}
@RequestMapping("/emps")
public String list(Map<String, Object> map){
map.put("employees", employeeDao.getAll());
return "list";
}
// @InitBinder
// public void initBinder(WebDataBinder binder){
// binder.setDisallowedFields("lastName");
// }
}
拦截器
package com.atguigu.springmvc.interceptors;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
public class FirstInterceptor implements HandlerInterceptor{
/**
* 该方法在目标方法之前被调用.
* 若返回值为 true, 则继续调用后续的拦截器和目标方法.
* 若返回值为 false, 则不会再调用后续的拦截器和目标方法.
*
* 可以考虑做权限. 日志, 事务等.
*/
@Override
public boolean preHandle(HttpServletRequest request,
HttpServletResponse response, Object handler) throws Exception {
System.out.println("[FirstInterceptor] preHandle");
return true;
}
/**
* 调用目标方法之后, 但渲染视图之前.
* 可以对请求域中的属性或视图做出修改.
*/
@Override
public void postHandle(HttpServletRequest request,
HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
System.out.println("[FirstInterceptor] postHandle");
}
/**
* 渲染视图之后被调用. 释放资源
*/
@Override
public void afterCompletion(HttpServletRequest request,
HttpServletResponse response, Object handler, Exception ex)
throws Exception {
System.out.println("[FirstInterceptor] afterCompletion");
}
}
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