ModelAttribute的使用
SessionAttribute注解的value包含对应的key,则会从HttpSession中获取key的value值,否则抛出异常
package com.hous.springmvc.controller; import java.util.Map; import javax.servlet.http.HttpServletRequest; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import com.hous.springmvc.pojo.User; @Controller public class ModelAttributeController { /** * 有@ModelAttribute标记的方法,会在每个目标方法执行之前被SpringMVC调用 * @param id * @param map */ @ModelAttribute public void getUser(@RequestParam(value="id", required=false) Integer id, Map<String, Object> map) { if(id != null) { //模拟从数据库中获取模型数据 User user = new User(101, "hous", "pass1234"); System.out.println("数据库查询【" + user + "】"); map.put("user", user); } } @RequestMapping("/testModelAttribute") public String testModelAttribute(HttpServletRequest request, @ModelAttribute(value="user") User user){ System.out.println("修改" + user.toString()); System.out.println(request.getCharacterEncoding()); return "success"; } }