ModelAndView
package springMvc01.MVC.handlers;
import java.io.IOException;
import java.io.Writer;
import java.util.Date;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import entities.User;
@RequestMapping("/springmvc")
@Controller
public class SpringTest {
private static final String SUSSESS="success";
/**
* 目标方法的返回值可以是ModelAndView类型
* 可以包含视图和模型信息
* springMvc会把ModelAndView的model中数据放到request 域对象中
*
* @return
*/
@RequestMapping("/testModelAndView")
public ModelAndView testModelAndView() {
String viewName=SUSSESS;
ModelAndView modelAndView = new ModelAndView(viewName);
//添加模型数据到ModelAndView 中。
modelAndView.addObject("time",new Date());
return modelAndView;
}
}
index.jsp
<a href="springmvc/testModelAndView">testModelAndView</a>
sussess.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
Success
<br>
time:${requestScope.time}
</body>
</html>
ModelMap 类型)的参数
import java.io.IOException;
import java.io.Writer;
import java.util.Arrays;
import java.util.Date;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import entities.User;
@RequestMapping("/springmvc")
@Controller
public class SpringTest {
private static final String SUSSESS="success";
/**
* 目标方法可以添加Map类型(实际上也可以是Model 类型的ModelMap 类型)的参数
* @param map
* @return
*/
@RequestMapping("/testMap")
public String testMap(Map<String,Object> map) {
System.out.println(map.getClass().getName());//org.springframework.validation.support.BindingAwareModelMap
map.put("names", Arrays.asList("tom","Jerry","Mike"));
System.out.println("testMap");
return SUSSESS;
}
}
<a href="springmvc/testMap">testMap</a>
@SessionAttributes 实现
package springMvc01.MVC.handlers;
import java.io.IOException;
import java.io.Writer;
import java.util.Arrays;
import java.util.Date;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.SessionAttributes;
import org.springframework.web.servlet.ModelAndView;
import entities.User;
/**
* @SessionAttributes 除了可以通过属性名指定需要放到会话中的属性外,如value={"user"}(value属性值)
* 还可以通过模型属性的对象类型指定哪些模型属性需要放到对话中 如types= {String.class}(types属性值)
* 注意:该注解只能使用在类上,不能放在方法上
* @author Administrator
*
*/
@SessionAttributes(value={"user"},types= {String.class})
@RequestMapping("/springmvc")
@Controller
public class SpringTest {
private static final String SUSSESS="success";
@RequestMapping("/testAttributes")
public String testAttributes(Map<String,Object> map) {
User user = new User("Tom","123456","tom@qq.com",15);
map.put("user", user);
map.put("school", "atguigu");
return SUSSESS;
}
}
index.jsp:<a href="springmvc/testAttributes">testAttributes</a>
success.jsp
request user:${requestScope.user}
<br>
session user :${sessionScope.user}
<br>
request school:${requestScope.school}
<br>
session school :${sessionScope.school}
@ModelAttribute实现
package springMvc01.MVC.handlers;
import java.io.IOException;
import java.io.Writer;
import java.util.Arrays;
import java.util.Date;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.SessionAttributes;
import org.springframework.web.servlet.ModelAndView;
import entities.User;
/**
* @SessionAttributes 除了可以通过属性名指定需要放到会话中的属性外,如value={"user"}(value属性值)
* 还可以通过模型属性的对象类型指定哪些模型属性需要放到对话中 如types= {String.class}(types属性值)
* 注意:该注解只能使用在类上,不能放在方法上
* @author Administrator
*
*/
//@SessionAttributes(value={"user"},types= {String.class})
@RequestMapping("/springmvc")
@Controller
public class SpringTest {
private static final String SUSSESS="success";
@RequestMapping("/testModelAttribute")
public String testModelAttribute(User user) {
System.out.println("update:"+user);
return SUSSESS;
}
/**
* 由@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对象然后把对象放在map里
User user = new User(1,"Tom","123456","tom@qq.com",12);
System.out.println("从数据库获取一个对象:"+user);
map.put("user", user);
}
}
}
运行流程:
1,执行@ModelAttribute注解修饰的方法,从数据库中取出对象,把对象放入到map中,键为:user
2.springMvc 从map中取出user对象,并把表单的请求对象赋给user对象的对应属性,
3.springMvc把上述对象传入目标方法的参数