HttpServletRequest常用简单的方法

package cn.ITHong.Request;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//HttpServletRequest常用简单的方法
public class RequestDemo0 extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");//记得加这一句不然out.print("url:"+url+"<br/>");解析不出<br/>会直接被打印，而不是过行
PrintWriter out = response.getWriter();
String url = request.getRequestURL().toString();//协议：主机和端口：资源的地址http://localhost:8080/Web07/servlet/RequestDemo0
String uri = request.getRequestURI();//请求的资源地址  /Web07/servlet/RequestDemo0
String qs =request.getQueryString();//获取get方式请求参数字符串 /Web07/servlet/RequestDemo0?username=abc&password=123
//得到这个username=abc&password=123
String remoteAddr = request.getRemoteAddr();
int remotePort = request.getRemotePort();//不是服务器使用的端口。客户机使用的端口，随机的（一般是1024<..<65535）
String method = request.getMethod();//客户端的请求方式。根据不同浏览器的 可能是 GET get，所以判断的时候要忽略大小写

//下面两种方法，在浏览器中无区别，后者只会加重负担，所以能用就用第一种
/**
* out.print("url:"+url);
* out.println("url:"+url);
* */
out.print("url:"+url+"<br/>");
out.print("uri:"+uri+"<br/>");
out.print("qs:"+qs+"<br/>");
out.print("remoteAddr:"+remoteAddr+"<br/>");
out.print("remotePort:"+remotePort+"<br/>");
out.print("method:"+method+"<br/>");

//out.println();
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

}

}

-------------------------------------------------------结果

<span style="font-family: 宋体;font-size:14px;">url:http://localhost:8080/Web07/servlet/RequestDemo0</span><br style="font-family: 宋体;font-size:14px;" /><span style="font-family: 宋体;font-size:14px;">uri:/Web07/servlet/RequestDemo0</span><br style="font-family: 宋体;font-size:14px;" /><span style="font-family: 宋体;font-size:14px;">qs:null</span><br style="font-family: 宋体;font-size:14px;" /><span style="font-family: 宋体;font-size:14px;">remoteAddr:0:0:0:0:0:0:0:1</span><br style="font-family: 宋体;font-size:14px;" /><span style="font-family: 宋体;font-size:14px;">remotePort:27279</span><br style="font-family: 宋体;font-size:14px;" /><span style="font-family: 宋体;font-size:14px;">method:GET</span>

<span style="font-family:宋体;font-size:14px;">----------------------------------------为了能让qs显示（GET请求参数内容）</span>

<span style="font-family:宋体;font-size:14px;">可以再原本</span><pre name="code" class="java"><span style="font-family:宋体;font-size:14px;"><a target=_blank href="http://localhost:8080/Web07/servlet/RequestDemo0">http://localhost:8080/Web07/servlet/RequestDemo0</a></span>

改为：

<span style="font-family:宋体;font-size:14px;"><a target=_blank href="http://localhost:8080/Web07/servlet/RequestDemo0">http://localhost:8080/Web07/servlet/RequestDemo0</a>?</span><span style="font-family: 宋体;font-size:14px;">username=abc&password=123</span>

<span style="font-family: 宋体;font-size:14px;">-----------------------------------------结果</span>

<span style="font-family: 宋体;font-size:14px;"><span style="font-family: 宋体;font-size:14px;">url:http://localhost:8080/Web07/servlet/RequestDemo0</span><br style="font-family: 宋体;font-size:14px;" /><span style="font-family: 宋体;font-size:14px;">uri:/Web07/servlet/RequestDemo0</span><br style="font-family: 宋体;font-size:14px;" /><span style="font-family: 宋体;font-size:14px;">qs:username=abc&password=123</span><br style="font-family: 宋体;font-size:14px;" /><span style="font-family: 宋体;font-size:14px;">remoteAddr:0:0:0:0:0:0:0:1</span><br style="font-family: 宋体;font-size:14px;" /><span style="font-family: 宋体;font-size:14px;">remotePort:27492</span><br style="font-family: 宋体;font-size:14px;" /><span style="font-family: 宋体;font-size:14px;">method:GET</span></span>