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010 处理模型数据（ModelAndView，Map Model，@SessionAttributes）

1.处理数据模型

　　SpringMVC提供了几种途径出书模型数据

二：ModelAndView

1.介绍

2.index

 1 <%@ page language="java" contentType="text/html; charset=utf-8"
 2     pageEncoding="utf-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     测试
11     <br>
12     <a href="helloworld7/">ModelAndViewTest</a>
13     <br><br><br>
14     测试Servlet API
15     <br>
16     <a href="helloworld6/">test servlet API</a>
17     <br>
18 </body>
19 </html>

3.controller

 1 package com.spring.it;
 2 
 3 import java.util.Date;
 4 
 5 import org.springframework.stereotype.Controller;
 6 import org.springframework.web.bind.annotation.RequestMapping;
 7 import org.springframework.web.servlet.ModelAndView;
 8 
 9 @Controller
10 public class ModelAndViewTest {
11     @RequestMapping("/helloworld7")
12     public ModelAndView hello() {
13         String viewName="success";
14         ModelAndView modelAndView=new ModelAndView(viewName);
15         //添加模型数据
16         modelAndView.addObject("time", new Date());
17         return modelAndView;
18     }
19 }

4.success

 1 <%@ page language="java" contentType="text/html; charset=utf-8"
 2     pageEncoding="utf-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     success page
11     <br>
12     time:${requestScope.time}
13 </body>
14 </html>

5.效果

6.ps

　　SpringMVC会把ModelAndView的model中的数据方法放到request 域对象中。

三：Model和Map

1.介绍

　　一般传入map就可以了

　　实际上，可以Model类型或者ModelMap类型。

2.controller

　　map放在方法参数里，如果新建一个map是不会传入进参数的。

 1 package com.spring.it;
 2 
 3 import java.util.Arrays;
 4 import java.util.Date;
 5 import java.util.HashMap;
 6 
 7 import org.springframework.stereotype.Controller;
 8 import org.springframework.web.bind.annotation.RequestMapping;
 9 import org.springframework.web.servlet.ModelAndView;
10 
11 @Controller
12 public class ModelAndViewTest {
13     @RequestMapping("/helloworld8")
14     public String hello1(HashMap<String,Object> map) {
15 //        HashMap<String,Object> map=new HashMap();
16         map.put("names", Arrays.asList("Tom","Jack","Bob"));
17         return "success";
18     }
19     
20     @RequestMapping("/helloworld7")
21     public ModelAndView hello2() {
22         String viewName="success";
23         ModelAndView modelAndView=new ModelAndView(viewName);
24         //添加模型数据
25         modelAndView.addObject("time", new Date());
26         return modelAndView;
27     }
28 }

3.index

 1 <%@ page language="java" contentType="text/html; charset=utf-8"
 2     pageEncoding="utf-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     测试MAP
11     <br>
12     <a href="helloworld8">MAP Test</a>
13     <br><br><br>
14     测试ModelAndViewTest
15     <br>
16     <a href="helloworld7">ModelAndViewTest</a>
17     <br><br><br>
18     测试Servlet API
19     <br>
20     <a href="helloworld6/">test servlet API</a>
21     <br>
22 </body>
23 </html>

4.success

 1 <%@ page language="java" contentType="text/html; charset=utf-8"
 2     pageEncoding="utf-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     success page
11     <br><br>
12     time:${requestScope.time}
13     <br><br>
14     names:${requestScope.names}
15 </body>
16 </html>

5.效果

四：@SessionAttributes之value

1.index

 1 <%@ page language="java" contentType="text/html; charset=utf-8"
 2     pageEncoding="utf-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     测试MAP
11     <br>
12     <a href="helloworld8">MAP Test</a>
13     <br><br><br>
14     测试ModelAndViewTest
15     <br>
16     <a href="helloworld7">ModelAndViewTest</a>
17     <br><br><br>
18     测试Servlet API
19     <br>
20     <a href="helloworld6/">test servlet API</a>
21     <br>
22 </body>
23 </html>

2.controller

　　注解只能放到类上。

 1 package com.spring.it;
 2 
 3 import java.util.Arrays;
 4 import java.util.Date;
 5 import java.util.HashMap;
 6 
 7 import org.springframework.stereotype.Controller;
 8 import org.springframework.web.bind.annotation.RequestMapping;
 9 import org.springframework.web.bind.annotation.SessionAttributes;
10 import org.springframework.web.servlet.ModelAndView;
11 
12 import com.spring.bean.Person;
13 
14 @SessionAttributes({"person"})
15 @Controller
16 public class ModelAndViewTest {
17     @RequestMapping("/helloworld8")
18     public String hello1(HashMap<String,Object> map) {
19         map.put("person", new Person("Tom", "12345", "tom#123.com", 18));
20         return "success";
21     }
22 }

3.success

 1 <%@ page language="java" contentType="text/html; charset=utf-8"
 2     pageEncoding="utf-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     success page
11     <br><br>
12     request person:${requestScope.person}
13     <br><br>
14     session person:${sessionScope.person}
15 </body>
16 </html>

4.效果

五：@SessionAttributes之types

1.介绍

2.insex

　　不变

3.controller

 1 package com.spring.it;
 2 
 3 import java.util.Arrays;
 4 import java.util.Date;
 5 import java.util.HashMap;
 6 
 7 import org.springframework.stereotype.Controller;
 8 import org.springframework.web.bind.annotation.RequestMapping;
 9 import org.springframework.web.bind.annotation.SessionAttributes;
10 import org.springframework.web.servlet.ModelAndView;
11 
12 import com.spring.bean.Person;
13 
14 @SessionAttributes(value={"person"},types= {String.class})
15 @Controller
16 public class ModelAndViewTest {
17     @RequestMapping("/helloworld8")
18     public String hello1(HashMap<String,Object> map) {
19         map.put("person", new Person("Tom", "12345", "tom#123.com", 18));
20         //说明types
21         map.put("school", "school value");
22         return "success";
23     }
24 }

4.seccess

 1 <%@ page language="java" contentType="text/html; charset=utf-8"
 2     pageEncoding="utf-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     success page
11     <br><br>
12     request person:${requestScope.person}
13     <br><br>
14     session person:${sessionScope.person}
15     <br><br>
16     request school:${requestScope.school}
17     <br><br>
18     session school:${sessionScope.school}
19 </body>
20 </html>

5.效果

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原文地址：https://www.cnblogs.com/juncaoit/p/8428864.html