javaservlet处理四种常用api请求get，put，post，delete

　　一般在网站搭建中servlet只需处理post，get请求便足已。本篇注重使用javaweb编写restful风格api，在servlet中对四种常用请求进行处理。

　　在api中对于一个请求要做的通常是提取header参数，提取携带数据(post，put)。在这里已post为例来说明用法。

　　下面是发起的post请求，用python（很简单）写的，该请求既有自定义header参数Bearer，也有携带数据bodys里的内容

import json
import requests

taken='YWMtoWBEBAFOEeei0SdHniRB6QAAAAAAAAAAAAAAAAAAjwAU4R56atn3HZQyagAgMAAAFanGEFTABPGgAqPOaU00kjW851AIpsKCuT8jAG1PqHyBpY6y5vOgk1zg'
headers = {'Accept': 'application/json','Content-Type':'application/json','Authorization':'Bearer '+taken}
bodys={'username':'test5','password':'123456'}
url='http://localhost:8080/xiaoyanAPI'
response=requests.post(url,data=json.dumps(bodys),headers=headers)
print response.text

　　下面是处理post请求代码

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//打印某一个header
System.out.println(request.getHeader("Authorization"));
System.out.println();
//获取header参数名，并打印出内容
Enumeration<String> s=request.getHeaderNames();
String str;
while((str=s.nextElement())!=null)
System.out.println(request.getHeader(str));
System.out.println();
//获取post携带数据流
String acceptjson;
try {
BufferedReader br = new BufferedReader(new InputStreamReader( (ServletInputStream) request.getInputStream(), "utf-8"));
StringBuffer sb = new StringBuffer("");
String temp;
while ((temp = br.readLine()) != null) {
sb.append(temp);
}
br.close();
acceptjson = sb.toString();
System.out.print(acceptjson);
} catch (Exception e) {
e.printStackTrace();
}
}

　　其他三种请求处理方式类似。