正文
010 处理模型数据（ModelAndView，Map Model，@SessionAttributes）
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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
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
测试
<br>
<a href="helloworld7/">ModelAndViewTest</a>
<br><br><br>
测试Servlet API
<br>
<a href="helloworld6/">test servlet API</a>
<br>
</body>
</html>
3.controller
package com.spring.it; import java.util.Date; import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView; @Controller
public class ModelAndViewTest {
@RequestMapping("/helloworld7")
public ModelAndView hello() {
String viewName="success";
ModelAndView modelAndView=new ModelAndView(viewName);
//添加模型数据
modelAndView.addObject("time", new Date());
return modelAndView;
}
}
4.success
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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=utf-8">
<title>Insert title here</title>
</head>
<body>
success page
<br>
time:${requestScope.time}
</body>
</html>
5.效果
6.ps
SpringMVC会把ModelAndView的model中的数据方法放到request 域对象中。
三：Model和Map
1.介绍
一般传入map就可以了
实际上，可以Model类型或者ModelMap类型。
2.controller
map放在方法参数里，如果新建一个map是不会传入进参数的。
package com.spring.it; import java.util.Arrays;
import java.util.Date;
import java.util.HashMap; import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView; @Controller
public class ModelAndViewTest {
@RequestMapping("/helloworld8")
public String hello1(HashMap<String,Object> map) {
// HashMap<String,Object> map=new HashMap();
map.put("names", Arrays.asList("Tom","Jack","Bob"));
return "success";
} @RequestMapping("/helloworld7")
public ModelAndView hello2() {
String viewName="success";
ModelAndView modelAndView=new ModelAndView(viewName);
//添加模型数据
modelAndView.addObject("time", new Date());
return modelAndView;
}
}
3.index
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
测试MAP
<br>
<a href="helloworld8">MAP Test</a>
<br><br><br>
测试ModelAndViewTest
<br>
<a href="helloworld7">ModelAndViewTest</a>
<br><br><br>
测试Servlet API
<br>
<a href="helloworld6/">test servlet API</a>
<br>
</body>
</html>
4.success
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
success page
<br><br>
time:${requestScope.time}
<br><br>
names:${requestScope.names}
</body>
</html>
5.效果
四：@SessionAttributes之value
1.index
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
测试MAP
<br>
<a href="helloworld8">MAP Test</a>
<br><br><br>
测试ModelAndViewTest
<br>
<a href="helloworld7">ModelAndViewTest</a>
<br><br><br>
测试Servlet API
<br>
<a href="helloworld6/">test servlet API</a>
<br>
</body>
</html>
2.controller
注解只能放到类上。
package com.spring.it; import java.util.Arrays;
import java.util.Date;
import java.util.HashMap; import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.SessionAttributes;
import org.springframework.web.servlet.ModelAndView; import com.spring.bean.Person; @SessionAttributes({"person"})
@Controller
public class ModelAndViewTest {
@RequestMapping("/helloworld8")
public String hello1(HashMap<String,Object> map) {
map.put("person", new Person("Tom", "12345", "tom#123.com", 18));
return "success";
}
}
3.success
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
success page
<br><br>
request person:${requestScope.person}
<br><br>
session person:${sessionScope.person}
</body>
</html>
4.效果
五：@SessionAttributes之types
1.介绍
2.insex
不变
3.controller
package com.spring.it; import java.util.Arrays;
import java.util.Date;
import java.util.HashMap; import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.SessionAttributes;
import org.springframework.web.servlet.ModelAndView; import com.spring.bean.Person; @SessionAttributes(value={"person"},types= {String.class})
@Controller
public class ModelAndViewTest {
@RequestMapping("/helloworld8")
public String hello1(HashMap<String,Object> map) {
map.put("person", new Person("Tom", "12345", "tom#123.com", 18));
//说明types
map.put("school", "school value");
return "success";
}
}
4.seccess
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
success page
<br><br>
request person:${requestScope.person}
<br><br>
session person:${sessionScope.person}
<br><br>
request school:${requestScope.school}
<br><br>
session school:${sessionScope.school}
</body>
</html>
5.效果
