SpringMVC学习（7）：处理模型数据

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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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