响应之返回值是void类型

    @RequestMapping("/testVoid")
    public void testVoid(Model model) {
        System.out.println("testVoid方法执行了...");
    }

package cn.itcast.controller;

import cn.itcast.domain.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Controller
@RequestMapping("/user")
public class UserController {

    @RequestMapping("/testString")
    public String testString(Model model) {
        System.out.println("testString方法执行了...");
        //模拟从数据库中取出User对象
        User user = new User();
        user.setUsername("美美");
        user.setPassword("123");
        user.setAge(30);
        //model对象
        model.addAttribute("user",user);
        return "success";
    }
    @RequestMapping("/testVoid")
    public void testVoid(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("testVoid方法执行了...");
        //编写请求转发的程序
        //request.getRequestDispatcher("/WEB-INF/pages/success.jsp").forward(request,response);
        //重定向
        //response.sendRedirect(request.getContextPath()+"/index.jsp");
        //设置中文乱码
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        //直接会进行响应
        response.getWriter().print("hello你好");
        return;

    }
}