@RequestMapping("/testVoid")
public void testVoid(Model model) {
System.out.println("testVoid方法执行了...");
} 会自动去找pages下的testVoid.jsp，因为没有，所以会报出404NotFound错误。
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;
}
} 
