spring_mvc_response

package cn.oesoft.springweb.controller; import cn.oesoft.springweb.domain.User; import com.fasterxml.jackson.databind.ObjectMapper; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @Controller @RequestMapping("/user") public class UserController { @RequestMapping(value="/quick10") @ResponseBody //期望SpringMVC自动将User转换成json格式的字符串 public User save10() throws IOException { User user = new User(); user.setUsername("lisi2"); user.setAge(32); return user; } @RequestMapping(value="/quick9") @ResponseBody public String save9() throws IOException { User user = new User(); user.setUsername("lisi"); user.setAge(30); //使用json的转换工具将对象转换成json格式字符串在返回 ObjectMapper objectMapper = new ObjectMapper(); String json = objectMapper.writeValueAsString(user); return json; } @RequestMapping(value="/quick8") @ResponseBody public String save8() throws IOException { return "{\"username\":\"zhangsan\",\"age\":18}"; } @RequestMapping(value="/quick7") @ResponseBody //告知SpringMVC框架 不进行视图跳转 直接进行数据响应 public String save7() throws IOException { return "hello itheima"; } @RequestMapping(value="/quick6") public void save6(HttpServletResponse response) throws IOException { response.getWriter().print("hello itcast"); } @RequestMapping("/quick666") public ModelAndView quickMethod3(){ ModelAndView modelAndView = new ModelAndView(); modelAndView.setViewName("forward:/WEB-INF/views/index.jsp"); modelAndView.addObject("username","lisi"); return modelAndView; } @RequestMapping(value="/quick5") public String save5(HttpServletRequest request){ request.setAttribute("username","酷丁鱼"); return "success"; } @RequestMapping(value="/quick4") public String save4(Model model){ model.addAttribute("username","博学谷"); return "success"; } @RequestMapping(value="/quick3") public ModelAndView save3(ModelAndView modelAndView){ modelAndView.addObject("username","itheima"); modelAndView.setViewName("success"); return modelAndView; } @RequestMapping(value="/quick2") public ModelAndView save2(){ /* Model:模型 作用封装数据 View：视图 作用展示数据 */ ModelAndView modelAndView = new ModelAndView(); //设置模型数据 modelAndView.addObject("username","itcast"); //设置视图名称 modelAndView.setViewName("success"); return modelAndView; } //请求必须是get请求，并带有username参数，才能映射到这个方法 @RequestMapping(value = "/quick",method = RequestMethod.GET,params = {"username"}) public String save(){ System.out.println("Controller save running...."); //return "/success.jsp";//从应用根目录出发找视图，没有/,表示相对路径，从/user出发找 return "forward:/jsp/success.jsp"; } }