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繼上面第二個(gè)springboot項(xiàng)目后，今晚應(yīng)朋友需求幫忙寫個(gè)抽獎(jiǎng)程序，想著就用springboot+servlet去發(fā)布一個(gè)服務(wù)給前端直接調(diào)用或者后端直接調(diào)用。 下面來介紹一下： 1、不錯(cuò)，依然需要一個(gè)Application的啟動(dòng)springboot的入口 - import org.springframework.boot.SpringApplication;
- import org.springframework.boot.autoconfigure.SpringBootApplication;
- import org.springframework.boot.web.servlet.ServletComponentScan;
-
- /**
- * Created by LK on 2016/5/7.
- */
- @SpringBootApplication
- @ServletComponentScan
- public class SpringBootServletSampleApplication {
- public static void main(String[] args) {
- SpringApplication.run(SpringBootServletSampleApplication.class,args);
- }
- }
特別的注意一下，是通過使用注解注冊(cè)Servlet @ServletComponentScan
2、下面就創(chuàng)建一個(gè)類來實(shí)現(xiàn)HttpServlet- import javax.servlet.ServletException;
- import javax.servlet.annotation.WebServlet;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import java.io.IOException;
- import java.util.Random;
-
- /**
- * Created by LK on 2016/5/7.
- */
- @WebServlet(urlPatterns = "/lottery/go",description = "請(qǐng)?jiān)谇岸薬jax調(diào)用或者直接httpclient直接調(diào)用，可以返回抽獎(jiǎng)結(jié)果，需要?jiǎng)e的功能可以繼續(xù)擴(kuò)展")
- public class LotteryServlet extends HttpServlet{
- @Override
- protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
- this.doPost(req,resp);
- }
-
- @Override
- protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
- Object[][] prizeArr = new Object[][]{
- //獎(jiǎng)品id,min,max，prize【獎(jiǎng)項(xiàng)】,v【中獎(jiǎng)率】
- {1,1,14,"一等獎(jiǎng)",1},
- {2,346,364,"一等獎(jiǎng)",1},
- {3,16,44,"不要灰心",10},
- {4,46,74,"神馬也沒有",10},
- {5,76,104,"祝您好運(yùn)",10},
- {6,106,134,"二等獎(jiǎng)",2},
- {7,136,164,"再接再厲",10},
- {8,166,194,"神馬也沒有",10},
- {9,196,224,"運(yùn)氣先攢著",10},
- {10,226,254,"三等獎(jiǎng)",5},
- {11,256,284,"要加油哦",10},
- {12,286,314,"神馬也沒有",10},
- {13,316,344,"謝謝參與",10}
- };
- Object result[] = award(prizeArr);//抽獎(jiǎng)后返回角度和獎(jiǎng)品等級(jí)
- resp.setContentType("text/html;charset=UTF-8");
- resp.getWriter().write("{\"angle\":\""+result[0]+"\",\"msg\":\""+result[2]+"\"}");
- System.out.println("轉(zhuǎn)動(dòng)角度:"+result[0]+"\t獎(jiǎng)項(xiàng)ID:"+result[1]+"\t提示信息:"+result[2]);
- }
- //抽獎(jiǎng)并返回角度和獎(jiǎng)項(xiàng)
- public Object[] award(Object[][] prizeArr){
- //概率數(shù)組
- Integer obj[] = new Integer[prizeArr.length];
- for(int i=0;i<prizeArr.length;i++){
- obj[i] = (Integer) prizeArr[i][4];
- }
- Integer prizeId = getRand(obj); //根據(jù)概率獲取獎(jiǎng)項(xiàng)id
- //旋轉(zhuǎn)角度
- int angle = new Random().nextInt((Integer)prizeArr[prizeId][2]-(Integer)prizeArr[prizeId][1])+(Integer)prizeArr[prizeId][1];
- String msg = (String) prizeArr[prizeId][3];//提示信息
- return new Object[]{angle,prizeId,msg};
- }
-
- //根據(jù)概率獲取獎(jiǎng)項(xiàng)
- public Integer getRand(Integer obj[]){
- Integer result = null;
- try {
- int sum = 0;//概率數(shù)組的總概率精度
- for(int i=0;i<obj.length;i++){
- sum+=obj[i];
- }
- for(int i=0;i<obj.length;i++){//概率數(shù)組循環(huán)
- int randomNum = new Random().nextInt(sum);//隨機(jī)生成1到sum的整數(shù)
- if(randomNum<obj[i]){//中獎(jiǎng)
- result = i;
- break;
- }else{
- sum -=obj[i];
- }
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- return result;
- }
- }
3、運(yùn)行Application的main之后，直接瀏覽器訪問 http://127.0.0.1:8080/lottery/Go 即可得到抽獎(jiǎng)結(jié)果 
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