JDK1.6自带的轻量级HTTP Server,无WEB容器暴露HTTP接口的解决方案

JDK6 提供了一个简单的Http Server API,据此咱们能够构建本身的嵌入式Http Server,它支持Http和Https协议,提供了HTTP1.1的部分实现，没有被实现的那部分能够经过扩展已有的Http Server API来实现,程序员必须本身实现HttpHandler接口,HttpServer会调用HttpHandler实现类的回调方法来处理客户端请求,在 这里,咱们把一个Http请求和它的响应称为一个交换,包装成HttpExchange类,HttpServer负责将HttpExchange传给 HttpHandler实现类的回调方法.

import com.sun.net.httpserver.Headers;  
import com.sun.net.httpserver.HttpExchange;  
import com.sun.net.httpserver.HttpHandler;  
import com.sun.net.httpserver.HttpServer;  
  
import java.io.IOException;  
import java.io.OutputStream;  
import java.net.InetSocketAddress;  
import java.util.Iterator;  
import java.util.List;  
import java.util.Set;  
import java.util.concurrent.Executors;  
  
//jdk自带轻量级http server例子  http://127.0.0.1:8080/server  
public class HttpServerDemo {  
    public static void main(String[] args) throws IOException {  
        InetSocketAddress addr = new InetSocketAddress(8080);  
        HttpServer server = HttpServer.create(addr, 0);  
  
        server.createContext("/server", new MyHandler());  
        server.setExecutor(Executors.newCachedThreadPool());  
        server.start();  
        System.out.println("Server is listening on port 8080");  
    }  
}  
  
class MyHandler implements HttpHandler {  
    public void handle(HttpExchange exchange) throws IOException {  
        String requestMethod = exchange.getRequestMethod();  
        if (requestMethod.equalsIgnoreCase("GET")) {  
            Headers responseHeaders = exchange.getResponseHeaders();  
            responseHeaders.set("Content-Type", "text/plain");  
            // responseHeaders.set("Content-Type", "text/html; charset=utf-8");  
            exchange.sendResponseHeaders(200, 0);
           // exchange.sendResponseHeaders(200, response.getBytes("GBK").length);
  
            OutputStream responseBody = exchange.getResponseBody();  
            Headers requestHeaders = exchange.getRequestHeaders();  
            Set<String> keySet = requestHeaders.keySet();  
            Iterator<String> iter = keySet.iterator();  
            while (iter.hasNext()) {  
                String key = iter.next();  
                List values = requestHeaders.get(key);  
                String s = key + " = " + values.toString() + "\n";  
                responseBody.write(s.getBytes());  
            }  
            responseBody.write("jdk自带轻量级http server例子".getBytes()); 
             //responseBody.write("jdk自带轻量级http server例子".getBytes("GBK"));
            responseBody.close();  
        }  
    }  
}

 

回调方法里不能经过spring的自动注入获取bean的实例，所以若是想要调其余接口，须要手动获取该接口的实例

final AbstractApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
retryBillService = (IRetryBillService) ctx.getBean("retryBillService");

注意，若是response中要输出中文，颇有可能在浏览器种显示乱码，所以能够以下操做：

 exchange.sendResponseHeaders(HttpURLConnection.HTTP_OK, response.getBytes("GBK").length);

 responseBody.write(response.getBytes("GBK"));

经过设置编码格式便可！！！

若是想接受客户端传过来的GET参数，能够经过以下代码：

URI requestedUri = exchange.getRequestURI(); 

//好比客户端请求链接为http://10.17.2.205:8866/account?tradeDate=20170108
//那么requestedUri.getRawQuery()获得的值为tradeDate=20170108，最后可解析该字符串获得相关的参数

String query = requestedUri.getRawQuery();