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10.5.2 开发Spring MVC控制器

10.5.2 开发Spring MVC控制器

本例的Spring MVC控制器会采用注解的方式工作,因此只要为这些控制器、控制器方法增加相应的注解修饰,这些控制器即可对外暴露JSON接口。下面是本例的Spring MVC控制器代码。

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package org.crazyit.auction.controller;

import java.util.List;
import javax.servlet.http.HttpSession;
import org.crazyit.auction.business.ItemBean;
import org.crazyit.auction.domain.Bid;
import org.crazyit.auction.domain.Item;
import org.crazyit.auction.domain.Kind;
import org.crazyit.auction.service.AuctionService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;


@Controller
@RequestMapping("/auction")
public class AuctionController
{
// 该前端处理类所依赖的业务逻辑组件
@Autowired
private AuctionService auctionService;

// 通过赢取者获取物品的方法
@GetMapping("/getItemByWiner")
@ResponseBody
public Object getItemByWiner(HttpSession sess) throws Exception
{
// 从HttpSession中取出userId属性
Integer winerId = (Integer) sess.getAttribute("userId");
List<ItemBean> itembeans = auctionService.getItemByWiner(winerId);
return itembeans;
}

// 获取所有流拍物品的方法
@GetMapping("/getFailItems")
@ResponseBody
public Object getFailItems() throws Exception
{
return auctionService.getFailItems();
}

// 处理用户登录的方法
@PostMapping(value = "/loginAjax")
@ResponseBody
public Object validLogin(String loginUser, String loginPass, String vercode,
HttpSession sess) throws Exception
{
String rand = (String) sess.getAttribute("rand");
if (rand != null && !rand.equalsIgnoreCase(vercode))
{
return "-2";
}
int result = auctionService.validLogin(loginUser, loginPass);
if (result > 0)
{
sess.setAttribute("userId", result);
return "1";
}
return "-1";
}

// 获取用户竞价的方法
@GetMapping("/getBidByUser")
@ResponseBody
public Object getBidByUser(HttpSession sess) throws Exception
{
// 从HttpSession中取出userId属性
Integer userId = (Integer) sess.getAttribute("userId");
return auctionService.getBidByUser(userId);
}

@GetMapping("/getItemsByOwner")
@ResponseBody
// 根据属主获取物品的方法
public Object getItemsByOwner(HttpSession sess) throws Exception
{
// 从HttpSession中取出userId属性
Integer userId = (Integer) sess.getAttribute("userId");
return auctionService.getItemsByOwner(userId);
}

// 获取所有物品种类的方法
@GetMapping("/getAllKind")
@ResponseBody
public Object getAllKind() throws Exception
{
return auctionService.getAllKind();
}

// 添加物品的方法
@PostMapping("/addItem")
@ResponseBody
public Object addItem(String name, String desc, String remark,
double initPrice, int avail, int kind, HttpSession sess)
throws Exception
{
// 从HttpSession中取出userId属性
Integer userId = (Integer) sess.getAttribute("userId");
Item item = new Item();
item.setItemName(name);
item.setItemDesc(desc);
item.setItemRemark(remark);
item.setInitPrice(initPrice);
int rowNum = auctionService.addItem(item, avail, kind, userId);
return rowNum > 0 ? "success" : "error";
}

// 添加种类的方法
@PostMapping("/addKind")
@ResponseBody
public Object addKind(String name, String desc) throws Exception
{
Kind kind = new Kind();
kind.setKindName(name);
kind.setKindDesc(desc);
int rowNum = auctionService.addKind(kind);
return rowNum > 0 ? "success" : "error";
}

// 根据种类获取物品的方法
@PostMapping("/getItemsByKind")
@ResponseBody
public Object getItemsByKind(int kindId) throws Exception
{
return auctionService.getItemsByKind(kindId);
}
// 添加竞价记录的方法
@PostMapping("/addBid")
@ResponseBody
public Object addBid(int itemId, double bidPrice, HttpSession sess)
throws Exception
{
Integer userId = (Integer) sess.getAttribute("userId");
Bid bid = new Bid();
bid.setBidPrice(bidPrice);
int id = auctionService.addBid(itemId, bid, userId);
return id > 0 ? "success" : "error";
}
}

在该代码中先定义了一个AuctionController 类,并使用@RequestMapping("/auction")修饰该类,这意味着该控制器内的所有处理方法都位于/auction命名空间下。比如getItemByWiner()方法使用了@GetMapping("/getItemByWiner")修饰,这意味着该处理方法对应的URL/auction/getItemByWiner

原文链接: 10.5.2 开发Spring MVC控制器