************************************************************服务器端代码**************************************************************************

Spring Web MVC(Servlet) 具体细节就不说了，比较不一样的地方，下面会注明！

1. web.xml 的内容如下:

[html] view plain copy print ?
  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  3. <display-name>FCAS</display-name>
  4. <servlet>
  5. <servlet-name>foodcenter</servlet-name>
  6. <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  7. <load-on-startup>1</load-on-startup>
  8. </servlet>
  10. <servlet-mapping>
  11. <servlet-name>foodcenter</servlet-name>
  12. <url-pattern>*.json</url-pattern>
  13. </servlet-mapping>
  15. </web-app>

2. foodcenter-servlet.xml 的内容如下：

[html] view plain copy print ?
  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <beans xmlns="http://www.springframework.org/schema/beans"
  3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4. xmlns:p="http://www.springframework.org/schema/p"
  5. xmlns:context="http://www.springframework.org/schema/context"
  6. xsi:schemaLocation="
  7. http://www.springframework.org/schema/beans
  8. http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
  9. http://www.springframework.org/schema/context
  10. http://www.springframework.org/schema/context/spring-context-3.0.xsd">
  12. <context:annotation-config/>
  14. <!-- Controller 类的注解标识-->
  15. <context:component-scan base-package="com.liuxi.foodcenter.controller"/>
  17. <!--这个ViewResolver 的具体原来没细究，不过CV战士们 中的一员，这样用是没问题的(参考官文) -->
  18. <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
  19. <property name="mediaTypes">
  20. <map>
  21. <entry key="json" value="application/json"/> <!-- 告诉视图解析器 返回的类型为json 格式 -->
  22. </map>
  23. </property>
  24. <property name="defaultViews">
  25. <list>
  26. <!-- 这个 View 比较重要,ModelAndView 里的数据变成JSON -->
  27. <bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView">
  28. </bean>
  29. </list>
  30. </property>
  31. </bean>
  33. <!--真正的项目，业务Bean 有专门对应的配置文件，这里为了简单起见，就写在这里了 -->
  34. <bean id="foodService" class="com.liuxi.food.service.FoodServiceImpl"/>
  36. </beans>

3. 子控制器FindFoodListController.java

[html] view plain copy print ?
  1. package com.liuxi.foodcenter.controller;
  2. import java.util.HashMap;
  3. import java.util.List;
  4. import java.util.Map;
  6. import org.springframework.beans.factory.annotation.Autowired;
  7. import org.springframework.beans.factory.annotation.Qualifier;
  8. import org.springframework.stereotype.Controller;
  9. import org.springframework.web.bind.annotation.RequestMapping;
  10. import org.springframework.web.bind.annotation.RequestParam;
  11. import org.springframework.web.servlet.ModelAndView;
  13. import com.liuxi.bean.Food;
  14. import com.liuxi.food.service.IFoodService;
  16. @Controller
  17. public class FindFoodListController {
  19. @Autowired @Qualifier("foodService")
  20. private IFoodService foodService;
  22. /** 根据餐菜的类别返回 该类别下的所有菜*/
  23. @RequestMapping("/findFoodList")
  24. public ModelAndView queryFoodList(@RequestParam("typeId") int typeId){
  26. List<Food> list=foodService.getFoodListByType(typeId);
  27. ModelAndView modelView=new ModelAndView();
  28. Map<String,Object> modelMap=new HashMap<String,Object>();
  29. modelMap.put("FOOD_LIST", list);
  30. modelMap.put("TYPE_ID", typeId);
  31. modelView.addAllObjects(modelMap);
  32. return modelView;
  33. }
  34. }

4. FoodServiceImpl.java

[html] view plain copy print ?
  1. package com.liuxi.food.service;
  3. import java.util.ArrayList;
  4. import java.util.List;
  6. import com.liuxi.bean.Food;
  8. public class FoodServiceImpl implements IFoodService{
  10. @Override
  11. public List<Food> getFoodListByType(int typeId) {
  12. //这里本来要调DAO层接口的，这边暂时写死
  14. Food food1=new Food(1,1,"鱼香肉丝", 12.00,"好吃的不得了-鱼香肉丝",4.5,5.0);
  15. Food food2=new Food(2,1,"农家小炒肉", 15.00,"好吃的不得了-农家小炒肉",3.7,4.3);
  16. Food food3=new Food(3,1,"韭菜炒蛋", 10.00,"好吃的不得了-韭菜炒蛋",2.6,3.0);
  17. Food food4=new Food(4,1,"回锅肉", 13.00,"好吃的不得了-回锅肉",3.1,3.8);
  18. Food food5=new Food(5,1,"宫保鸡丁", 14.00,"好吃的不得了-宫保鸡丁",3.7,5.0);
  19. Food food6=new Food(6,1,"苦瓜炒蛋", 9.00,"好吃的不得了-宫保鸡丁",4.9,4.7);
  20. Food food7=new Food(7,1,"莴笋肉片", 10.00,"好吃的不得了-莴笋肉片",2.6,3.9);
  22. List<Food> list=new ArrayList<Food>();
  23. list.add(food1);
  24. list.add(food2);
  25. list.add(food3);
  26. list.add(food4);
  27. list.add(food5);
  28. list.add(food6);
  29. list.add(food7);
  31. return list;
  33. }
  35. }

5.IFoodService.java

[html] view plain copy print ?
  1. package com.liuxi.food.service;
  2. import java.util.List;
  4. import com.liuxi.bean.Food;
  5. public interface IFoodService {
  6. List<Food> getFoodListByType(int typeId);
  7. }

6.Food.java

[html] view plain copy print ?
  1. package com.liuxi.bean;
  3. public class Food {
  5. private int id; // ID
  6. private String name; // 菜名
  7. private double price; // 价格
  8. private String notes; // 菜的简要介绍
  9. private int foodTypeId; // 菜所属的类别
  11. private double kouWeiScore; // 口味的分值
  12. private double hotLevel; // 星级别
  14. public Food(int id, int foodTypeId, String name, double price,
  15. String notes, double kouWeiScore, double hotLevel) {
  16. this.id = id;
  17. this.name = name;
  18. this.price = price;
  19. this.notes = notes;
  20. this.foodTypeId = foodTypeId;
  21. this.kouWeiScore = kouWeiScore;
  22. this.hotLevel = hotLevel;
  24. }
  26. public Food() {
  28. }
  30. public int getId() {
  31. return id;
  32. }
  34. public void setId(int id) {
  35. this.id = id;
  36. }
  38. public String getName() {
  39. return name;
  40. }
  42. public void setName(String name) {
  43. this.name = name;
  44. }
  46. public double getPrice() {
  47. return price;
  48. }
  50. public void setPrice(double price) {
  51. this.price = price;
  52. }
  54. public String getNotes() {
  55. return notes;
  56. }
  58. public void setNotes(String notes) {
  59. this.notes = notes;
  60. }
  62. public int getFoodTypeId() {
  63. return foodTypeId;
  64. }
  66. public void setFoodTypeId(int foodTypeId) {
  67. this.foodTypeId = foodTypeId;
  68. }
  70. public double getKouWeiScore() {
  71. return kouWeiScore;
  72. }
  74. public void setKouWeiScore(double kouWeiScore) {
  75. this.kouWeiScore = kouWeiScore;
  76. }
  78. public double getHotLevel() {
  79. return hotLevel;
  80. }
  82. public void setHotLevel(double hotLevel) {
  83. this.hotLevel = hotLevel;
  84. }
  86. public String toString() {
  87. return id + "--" + name + "--" + price + "--" + notes + "--"
  88. + foodTypeId + "--" + kouWeiScore + "--" + hotLevel;
  90. }
  92. }

7.Spring Web MVC 中 将ModelAndView 中的数据自动转换成json ，靠的是jackjson 中 连个jar 包 (这个下载大本营里有下,花了我2积分哦)

jackson-core-asl-1.4.2.jar

jackson-mapper-asl-1.4.2.jar


*************************************以上是服务器端代码，已全部贴完!**********************************************

访问链接是: http://192.168.1.104:8088/FCAS/findFoodList.json?typeId=1


***************************************************************************Android 客户端 访问部分************************************************************

下面进入 Android 客户端访问部分(这里暂不贴 界面，用android 的单元测试 来 测试 服务器返回的json 数据是什么样的

8. GetFoodListTest.java

[java] view plain copy print ?
  1. package com.liuxi.takeorder.test;
  3. import java.io.BufferedReader;
  4. import java.io.InputStreamReader;
  5. import java.util.ArrayList;
  7. import org.apache.http.HttpResponse;
  8. import org.apache.http.HttpStatus;
  9. import org.apache.http.NameValuePair;
  10. import org.apache.http.client.HttpClient;
  11. import org.apache.http.client.entity.UrlEncodedFormEntity;
  12. import org.apache.http.client.methods.HttpPost;
  13. import org.apache.http.impl.client.DefaultHttpClient;
  14. import org.apache.http.message.BasicNameValuePair;
  16. import android.test.AndroidTestCase;
  17. import android.util.Log;
  19. public class GetFoodListTest extends AndroidTestCase {
  21. private static final String TAG="GetFoodListTest";
  22. public void testFindFoodList() {
  23. String uri="http://192.168.1.104:8088/FCAS/findFoodList.json?typeId=1";
  24. try{
  25. HttpClient httpClient=new DefaultHttpClient();
  27. //HttpPost 实现 HttpUriRequest 接口,HttpUriRequest接口 继承 HttpRequest
  28. HttpPost httpPostReq=new HttpPost(uri);
  30. ArrayList<NameValuePair> paramList=new ArrayList<NameValuePair>();
  32. NameValuePair param1=new BasicNameValuePair("typeId",String.valueOf(1));
  33. paramList.add(param1);
  35. httpPostReq.setEntity(new UrlEncodedFormEntity(paramList));
  38. HttpResponse resp=httpClient.execute(httpPostReq);
  40. if(resp.getStatusLine().getStatusCode()==HttpStatus.SC_OK){
  41. BufferedReader reader=new BufferedReader(
  42. new InputStreamReader(resp.getEntity().getContent())
  43. );
  44. StringBuffer result=new StringBuffer();
  45. String inputLine=null;
  46. while((inputLine=reader.readLine())!=null){
  47. result.append(inputLine);
  48. }
  50. Log.i(TAG, result.toString());
  51. }
  53. }catch(Exception e){
  54. Log.i(TAG,e.getMessage());
  55. }
  56. }
  57. }


9. 激动人心的时刻-----> 结果是啥？

日志记录为:

07-19 16:12:53.282: INFO/GetFoodListTest(1287): {"TYPE_ID":1,"FOOD_LIST":[{"name":"鱼香肉丝","id":1,"price":12.0,"notes":"好吃的不得了-鱼香肉丝","foodTypeId":1,"kouWeiScore":4.5,"hotLevel":5.0},{"name":"农家小炒肉","id":2,"price":15.0,"notes":"好吃的不得了-农家小炒肉","foodTypeId":1,"kouWeiScore":3.7,"hotLevel":4.3},{"name":"韭菜炒蛋","id":3,"price":10.0,"notes":"好吃的不得了-韭菜炒蛋","foodTypeId":1,"kouWeiScore":2.6,"hotLevel":3.0},{"name":"回锅肉","id":4,"price":13.0,"notes":"好吃的不得了-回锅肉","foodTypeId":1,"kouWeiScore":3.1,"hotLevel":3.8},{"name":"宫保鸡丁","id":5,"price":14.0,"notes":"好吃的不得了-宫保鸡丁","foodTypeId":1,"kouWeiScore":3.7,"hotLevel":5.0},{"name":"苦瓜炒蛋","id":6,"price":9.0,"notes":"好吃的不得了-宫保鸡丁","foodTypeId":1,"kouWeiScore":4.9,"hotLevel":4.7},{"name":"莴笋肉片","id":7,"price":10.0,"notes":"好吃的不得了-莴笋肉片","foodTypeId":1,"kouWeiScore":2.6,"hotLevel":3.9}]}


我把上面{} 里的东西 放到一个foodlist.json 文件中，格式化后的内容如下：

[html] view plain copy print ?
  1. {
  2. "TYPE_ID" : 1,
  3. "FOOD_LIST" : [{
  4. "name" : "鱼香肉丝",
  5. "id" : 1,
  6. "price" : 12.0,
  7. "notes" : "好吃的不得了-鱼香肉丝",
  8. "foodTypeId" : 1,
  9. "kouWeiScore" : 4.5,
  10. "hotLevel" : 5.0
  11. }, {
  12. "name" : "农家小炒肉",
  13. "id" : 2,
  14. "price" : 15.0,
  15. "notes" : "好吃的不得了-农家小炒肉",
  16. "foodTypeId" : 1,
  17. "kouWeiScore" : 3.7,
  18. "hotLevel" : 4.3
  19. }, {
  20. "name" : "韭菜炒蛋",
  21. "id" : 3,
  22. "price" : 10.0,
  23. "notes" : "好吃的不得了-韭菜炒蛋",
  24. "foodTypeId" : 1,
  25. "kouWeiScore" : 2.6,
  26. "hotLevel" : 3.0
  27. }, {
  28. "name" : "回锅肉",
  29. "id" : 4,
  30. "price" : 13.0,
  31. "notes" : "好吃的不得了-回锅肉",
  32. "foodTypeId" : 1,
  33. "kouWeiScore" : 3.1,
  34. "hotLevel" : 3.8
  35. }, {
  36. "name" : "宫保鸡丁",
  37. "id" : 5,
  38. "price" : 14.0,
  39. "notes" : "好吃的不得了-宫保鸡丁",
  40. "foodTypeId" : 1,
  41. "kouWeiScore" : 3.7,
  42. "hotLevel" : 5.0
  43. }, {
  44. "name" : "苦瓜炒蛋",
  45. "id" : 6,
  46. "price" : 9.0,
  47. "notes" : "好吃的不得了-宫保鸡丁",
  48. "foodTypeId" : 1,
  49. "kouWeiScore" : 4.9,
  50. "hotLevel" : 4.7
  51. }, {
  52. "name" : "莴笋肉片",
  53. "id" : 7,
  54. "price" : 10.0,
  55. "notes" : "好吃的不得了-莴笋肉片",
  56. "foodTypeId" : 1,
  57. "kouWeiScore" : 2.6,
  58. "hotLevel" : 3.9
  59. }]
  60. }

10. OK! 返回数据正确。


************************************************Spring 是用ObjectMapper 将 数据转换成json 数据的*****************************

下面自己写了个转换的例子:

ObjectMapperTest.java

[html] view plain copy print ?
  1. package com.bean.test;
  3. import java.util.ArrayList;
  4. import java.util.HashMap;
  5. import java.util.List;
  6. import java.util.Map;
  8. import org.codehaus.jackson.map.ObjectMapper;
  10. public class ObjectMapperTest {
  12. /**
  13. * @param args
  14. */
  15. public static void main(String[] args) throws Exception {
  17. ObjectMapper mapper=new ObjectMapper();
  19. Map<String,Object> foodListData=new HashMap<String,Object>();
  20. List list=new ArrayList();
  22. Map<String,Object> foodData=new HashMap<String,Object>();
  23. foodData.put("id", 1);
  24. foodData.put("name", "鱼香肉丝");
  25. foodData.put("price", 12.00);
  26. foodData.put("notes", "好吃啊，真的!");
  27. foodData.put("kouWeiScore", 4.5);
  28. foodData.put("hotLevel", 5.0);
  30. list.add(foodData);
  32. foodListData.put("foodlist", list);
  34. String str=mapper.writeValueAsString(foodListData);
  35. System.out.println(str);
  36. }
  38. }

上述程序输出的是:

{"foodlist":[{"id":1,"kouWeiScore":4.5,"price":12.0,"hotLevel":5.0,"name":"鱼香肉丝","notes":"好吃啊，真的!"}]}

format 下：

{
"foodlist" : [{
"id" : 1,
"kouWeiScore" : 4.5,
"price" : 12.0,
"hotLevel" : 5.0,
"name" : "鱼香肉丝",
"notes" : "好吃啊，真的!"
}]
}


好吧，就到这里了。基本架子搭好，接着，就用这个架子来 实现 Android 客户端+Spring MVC 去做后面的项目。继续挖矿。。。。

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