request代表了请求
response代表响应
HttpServletResponse
setStatus();----->发送状态码
setHeader();---->发送响应头
getWriter();和getOutputStream();------>发送数据
addHeader();---->添加一个头
containsHeader();--->包含几个头
如果不加：response.setHeader("Content-type","text/html;charset=UTF-8");
浏览器读出涓球，默认国标读，不是utf-8
package cn.itcaste.web.servlet;
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/ResponseDemo1")
public class ResponseDemo1 extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//以什么编码发就用什么编码读
response.setHeader("Content-type","text/html;charset=UTF-8");
String data="中国";
OutputStream out=response.getOutputStream();
out.write(data.getBytes("UTF-8"));
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
Servlet------>request和response
原文：http://www.cnblogs.com/SnowingYXY/p/6636727.html