获取响应数据 - 重定向案例 - 《JAVA学习》

需求：创建一个搜索页面，通过百度搜索引擎完成内容搜索。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="Redirect.do" method="post">
        <input type="text" name="search"/>
        <input type="submit" value="搜索"/>
    </form>
</body>
</html>

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
public class RedirectServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req, resp);
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //设置请求编码
        req.setCharacterEncoding("utf-8");
        //获取请求数据
        String search = req.getParameter("search");
        //产生重定向响应
        resp.sendRedirect("https://www.baidu.com/s?wd="+ URLEncoder.encode(search,"utf-8"));
    }
}