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SpringMVC学习(7):处理模型数据

2017-04-23 00:51 501 查看
SpringMVC提供了1.ModelAndView作为返回值添加模型数据2.Map作为传入参数,在处理方法返回时将Map中的数据添加到模型中

一、ModelAndView

ModelAndView中既包含了视图信息也包含了模型数据,SpringMVC会把ModelAndView的model中数据放入到request 域对象中。

在处理方法中:

package springmvc;

import java.util.Date;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import springmvc.User;

@Controller
@RequestMapping("/springmvc")
public class HelloWorld {

private static final String SUCCESS = "success";

@RequestMapping("/testModelAndView")
public ModelAndView testModelAndView() {
String viewName = SUCCESS;
ModelAndView modelAndView = new ModelAndView(viewName);

//添加模型数据到ModelAndView中
modelAndView.addObject("time", new Date());

return modelAndView;
}
}
在index.jsp中
<%@ 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>SpringMVC</title>
</head>
<body>

<a href="springmvc/testModelAndView">Test ModelAndView</a>

</body>
</html>
在success,jsp中
<%@ 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>SpringMVC</title>
</head>
<body>
<h4>success page</h4>
time:${requestScope.time}
<br><br>
</body>
</html>运行起来可以看到效果





二、Map

目标方法可以添加Map类型(实际上也可以是Model类型或者ModelMap类型)的参数

处理方法文件:

package springmvc;

import java.util.Arrays;
import java.util.Date;
import java.util.Map;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import springmvc.User;

@Controller
@RequestMapping("/springmvc")
public class HelloWorld {

private static final String SUCCESS = "success";

@RequestMapping("/testMap")
public String testMap(Map<String, Object> map) {
System.out.println(map.getClass().getName());
map.put("names", Arrays.asList("Tom", "Jerry", "Mike"));
return SUCCESS;
}
}
index.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>SpringMVC</title>
</head>
<body>

<a href="springmvc/testMap">Test Map</a>

</body>
</html>
success.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>SpringMVC</title>
</head>
<body>
<h4>success page</h4>
names:${requestScope.names}
<br><br>
</body>
</html>运行一下可以看到效果:



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