在利用Springboot熟悉http基本內容的時候，自己弄了一個很簡單的demo，將一個http請求中的內容轉化成String格式打印出來。

程式碼如下:

其中:

1. IOUtils,用於將InputStream轉化成Spring;

2. @ResponseBody註解用於返回處理結果，如果沒有的話，請求頁面會報不支援"GET"或者"POST"方法的錯誤。

3. @Controller，有Controller，這個類才會被掃描到;

4. @SpringBootApplication：在SpringBoot的啟動類上，需要新增@SpringBootAapplication註解，這樣才會去掃描同根目錄下的其他類；

    @SpringBootApplication = @Controller + @EnableAutoConfiguration + @ComponentScan

5. @RequesterMapping註解用於對映不同的uri,具體用法參考RequestMapping這個註解本身；

6. 可以用postman傳送模擬請求對這部分程式碼進行測試。

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package helloworld.controller;
 
import org.apache.commons.io.IOUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.servlet.http.HttpServletRequest;
 
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
@Controller
public class RequestController {
    @RequestMapping("/david")
    @ResponseBody
String david() {
        return "Hello, David!";
}

    @RequestMapping(value = "/angus/**", method = RequestMethod.GET)
    @ResponseBody
public String getProcess(HttpServletRequest request){
        String retrunValue = "Hello, Angus! This is GET request!";
System.out.println("=======GET Process=======");
Map<String,String[]> requestMsg = request.getParameterMap();
Enumeration<String> requestHeader = request.getHeaderNames();
System.out.println("------- header -------");
        while(requestHeader.hasMoreElements()){
            String headerKey=requestHeader.nextElement().toString();
//列印所有Header值
System.out.println("headerKey="+headerKey+";value="+request.getHeader(headerKey));
}

        System.out.println("------- parameter -------");
        for(String key :requestMsg.keySet())
        {
            for(int i=0;i<requestMsg.get(key).length;i++)
            {
                //列印所有請求引數值
System.out.println("key="+key+";value="+requestMsg.get(key)[i].toString());
}
        }
        return retrunValue;
}

    @RequestMapping(value = "/angus/**", method = RequestMethod.POST)
    @ResponseBody
public String postProcess(HttpServletRequest request){
        String retrunValue = "Hello, Angus! This is POST Request!";
System.out.println("=======POST Process=======");
Map<String,String[]> requestMsg = request.getParameterMap();
Enumeration<String> requestHeader = request.getHeaderNames();
InputStream io = null;
String body;
System.out.println("------- body -------");
        try{
            io = request.getInputStream();
body = IOUtils.toString(io);
//列印BODY內容
System.out.println("Request Body="+body);
}catch(IOException e){
            e.printStackTrace();
}

        System.out.println("------- header -------");
        while(requestHeader.hasMoreElements()){
            String headerKey=requestHeader.nextElement().toString();
//列印所有Header值
System.out.println("headerKey="+headerKey+";value="+request.getHeader(headerKey));
}

        System.out.println("------- parameters -------");
        for(String key :requestMsg.keySet())
        {
            for(int i=0;i<requestMsg.get(key).length;i++)
            {
                //列印所有請求引數值
System.out.println("key="+key+";value="+requestMsg.get(key)[i].toString());
}
        }
        return retrunValue;
}
}