Intellij IDEA 的maven專案通過Java程式碼實現Jetty的Http伺服器(推薦)

2022-07-07 14:01:40

一、新增 pom.xml

 <!-- Jetty。要注意版本，版本匹配不對時，執行Jetty的應用將會報錯-->
    <dependency>
      <groupId>org.eclipse.jetty.aggregate</groupId>
      <artifactId>jetty-all</artifactId>
      <version>8.0.4.v20111024</version>
    </dependency>

二、在maven 載入 jetty

點選重新整理圖示系統會自動載入 jetty

載入完成後就會出現org.eclipse.jetty.aggregate:jetty-all:8.0.4.v20111024

三、新建AttendentConsoleHttpServlet.java

package com.SinaServer;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;import java.util.HashMap;
import java.util.Map;
/**
 * @title: AttendentConsoleHttpServlet
 * @Author wxj
 * @Date: 2021/6/24 10:30
 * @Version 1.0
 */
public class AttendentConsoleHttpServlet extends HttpServlet {
    @Override
    public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException {
        System.out.println(req.toString());
        BufferedReader streamReader = new BufferedReader( new InputStreamReader(req.getInputStream(), "UTF-8"));
        StringBuilder responseStrBuilder = new StringBuilder();
        String inputStr;
        while ((inputStr = streamReader.readLine()) != null)
            responseStrBuilder.append(inputStr);
        System.out.println(responseStrBuilder.toString());
        //允許跨域
        res.setHeader("Access-Control-Allow-Origin", "*");
        res.setHeader("Access-Control-Allow-Methods", "*");
        res.setHeader("Access-Control-Max-Age", "3600");
        res.addHeader("Access-Control-Allow-Headers", "*");
        res.setHeader("Access-Control-Allow-Credentials", "*");
        //
        //Map<String ,String> map = JSON.parseObject(Base64.decode(responseStrBuilder.toString()),Map.class);
        //this.doGet(req, res);
    }
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)  {
        response.setContentType("text/html;charset=utf-8");
        response.setStatus(HttpServletResponse.SC_OK);
        //允許跨域
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "*");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.addHeader("Access-Control-Allow-Headers", "*");
        response.setHeader("Access-Control-Allow-Credentials", "*");
        //
        System.out.println("get request:");
        Map<String, String[]> maps =  request.getParameterMap();
        HashMap<String,String> mapAction = new HashMap<>();
        for (Map.Entry<String, String[]> entry : maps.entrySet()) {
            //String cs = entry.getKey() + ":"+ Arrays.toString(entry.getValue())+";";
            String cs = entry.getKey() + ":"+ entry.getValue()[0]+";";
            System.out.println(cs);
            mapAction.put(entry.getKey(),entry.getValue()[0]);
        }
        //如果包含action請求
        String strResponse="";
        if (mapAction.containsKey("action")){
            switch (mapAction.get("action")){
                case "query":
                    strResponse=this.query();
                    break;
                default:
            }
        }
        //
        try {
            response.getWriter().println(strResponse);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public String query(){
        String json="Hello Word! 已收到請求";
        return  json;
    }
}

四、在App.java 中加入

package com.SinaServer;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.ContextHandlerCollection;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;
/**
 * Hello world!
 *
 */
public class App 
{
    public static void main( String[] args )
    {
        System.out.println( "Hello World!111222" );
 
        //jetty的處理集合
        ContextHandlerCollection contexts = new ContextHandlerCollection();
        //jetty http請求事件
        ServletContextHandler context1 = new ServletContextHandler(ServletContextHandler.SESSIONS);
        //httpapi
        AttendentConsoleHttpServlet httpServletCli= new AttendentConsoleHttpServlet();
        context1.addServlet(new ServletHolder(httpServletCli), "/httpCli");//httpapi
        contexts.addHandler(context1);
        //jetty伺服器啟動
        Server server = new Server(5011);//設定埠
        server.setHandler(contexts);
        try {
            server.start();//jetty伺服器啟動
            System.out.println("Jetty Server 啟動成功。port : 5011" );
            server.join();
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e.getMessage());
        }
    }
}