12.7 控制层功能实现

FormController.java

package com.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
/**
 * 表单控制器
 */
public class FormController {
    @RequestMapping(value = "/loginForm")
    public String loginForm() {
        // 返回表单的地址
        return "/loginForm";
    }
}

UserController.java

/MyBookApp/src/com/controller/UserController.java

package com.controller;

import javax.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.view.RedirectView;
import com.domain.User;
import com.service.UserService;

@Controller
public class UserController {
    /**
     * 自动注入UserService
     */
    @Autowired
    @Qualifier("userService")
    private UserService userService;

    /**
     * 处理/login请求
     */
    @RequestMapping("/login")
    public ModelAndView login(String loginname, String password, ModelAndView mv, HttpSession session) {
        System.out.println("com.controller.UserController.login(String, String, ModelAndView, HttpSession)");
        // 指定登录业务
        User user = userService.login(loginname, password);
        if (user != null) {
            System.out.println("登录成功:" + user);
            // 登录成功,将User独享设置到HttpSession作用域中
            session.setAttribute("user", user);
            mv.setView(new RedirectView("/MyBookApp/main"));
            // mv.setViewName("loginForm");
            // mv.setViewName("redirect:/main");
        } else {
            mv.addObject("message", "登录名或密码错误,请重新输入!");
            mv.setViewName("loginForm");
        }
        return mv;
    }
}

BookController.java

/MyBookApp/src/com/controller/BookController.java

package com.controller;

import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import com.domain.Book;
import com.service.BookService;

@Controller
public class BookController {
    /**
     * 自动注入BookService.
     */
    @Autowired
    @Qualifier("bookService")
    private BookService bookService;

    @RequestMapping(value = "/main")
    public String main(Model model) {
        System.out.println("com.controller.BookController.main(Model)");
        List<Book> book_list = bookService.getAllBooks();
        model.addAttribute("book_list", book_list);
        return "main";
    }
}

控制层使用了Spring的@Autowired注解自动注入服务层的Service对象,@Qualifier注解用于指明需要注入的具体类型,并且使用@Controller注解将类注释成为Spring的Controller。