1、web.xml添加

       
     
      HiddenHttpMethodFilter
        
     
      org.springframework.web.filter.HiddenHttpMethodFilter
     
    
       
     
      HiddenHttpMethodFilter
        
     
      /*
     
    

2、Controller类方式上添加注解

package com.how2java.controller; import java.util.List; import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.servlet.ModelAndView; import com.how2java.pojo.Category;import com.how2java.service.CategoryService;import com.how2java.util.Page; // 告诉spring mvc这是一个控制器类@Controller@RequestMapping("")public class CategoryController {    @Autowired    CategoryService categoryService;     @RequestMapping(value="/categories",method=RequestMethod.GET)    public ModelAndView listCategory(Page page){             ModelAndView mav = new ModelAndView();        List
    
      cs= categoryService.list(page);        int total = categoryService.total();                 page.caculateLast(total);                 // 放入转发参数        mav.addObject("cs", cs);        // 放入jsp路径        mav.setViewName("listCategory");        return mav;    }         @RequestMapping(value="/categories",method=RequestMethod.POST)    public ModelAndView addCategory(Category category){        System.out.println("category.getName():"+category.getName());        categoryService.add(category);        ModelAndView mav = new ModelAndView("redirect:/categories");        return mav;    }           @RequestMapping(value="/categories/{id}",method=RequestMethod.DELETE)    public ModelAndView deleteCategory(Category category){        categoryService.delete(category);        ModelAndView mav = new ModelAndView("redirect:/categories");        return mav;    }      @RequestMapping(value="/categories/{id}",method=RequestMethod.GET)    public ModelAndView editCategory(Category category){        Category c= categoryService.get(category.getId());        ModelAndView mav = new ModelAndView("editCategory");        mav.addObject("c", c);        return mav;    }      @RequestMapping(value="/categories/{id}",method=RequestMethod.PUT)    public ModelAndView updateCategory(Category category){        categoryService.update(category);        ModelAndView mav = new ModelAndView("redirect:/categories");        return mav;    }   }