springmvc之ModelAndView的使用详解

一.前言

ModelAndView类用来存储处理完后的结果数据，以及显示该数据的视图,其中Model代表模型，View代表视图。业务处理器调用模型层处理完用户请求后，把结果数据存储在该类的model属性中，把要返回的视图信息存储在该类的view属性中，然后让该ModelAndView返回该Spring MVC框架。框架通过调用配置文件中定义的视图解析器，对该对象进行解析，最后把结果数据显示在指定的view页面。

二.主要功能

1.跳转指定页面且传递参数

下面利用springboot和thyemeleaf模板引擎测试

    @GetMapping("/regist")public ModelAndView regist(){ModelAndView view = new ModelAndView("regist");User user = new User("lss0555","123456");view.addObject("name","lss");view.addObject("user",user);return view;}

其中regist.html页面

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head><meta charset="UTF-8">
</head>
<body><div><div>  name: <span th:text="${name}"/></div><div>  username: <span th:text="${user.username}"/></div><div>  password: <span th:text="${user.password}"/></div></div>
</body>
</html>

访问/regist,结果:

name: lss
username: lss0555
password: 123456

三.源码

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//package org.springframework.web.servlet;import java.util.Map;
import org.springframework.http.HttpStatus;
import org.springframework.ui.ModelMap;
import org.springframework.util.CollectionUtils;public class ModelAndView {private Object view;private ModelMap model;private HttpStatus status;private boolean cleared = false;public ModelAndView() {}public ModelAndView(String viewName) {this.view = viewName;}public ModelAndView(View view) {this.view = view;}public ModelAndView(String viewName, Map<String, ?> model) {this.view = viewName;if (model != null) {this.getModelMap().addAllAttributes(model);}}public ModelAndView(View view, Map<String, ?> model) {this.view = view;if (model != null) {this.getModelMap().addAllAttributes(model);}}public ModelAndView(String viewName, HttpStatus status) {this.view = viewName;this.status = status;}public ModelAndView(String viewName, Map<String, ?> model, HttpStatus status) {this.view = viewName;if (model != null) {this.getModelMap().addAllAttributes(model);}this.status = status;}public ModelAndView(String viewName, String modelName, Object modelObject) {this.view = viewName;this.addObject(modelName, modelObject);}public ModelAndView(View view, String modelName, Object modelObject) {this.view = view;this.addObject(modelName, modelObject);}public void setViewName(String viewName) {this.view = viewName;}public String getViewName() {return this.view instanceof String ? (String)this.view : null;}public void setView(View view) {this.view = view;}public View getView() {return this.view instanceof View ? (View)this.view : null;}public boolean hasView() {return this.view != null;}public boolean isReference() {return this.view instanceof String;}protected Map<String, Object> getModelInternal() {return this.model;}public ModelMap getModelMap() {if (this.model == null) {this.model = new ModelMap();}return this.model;}public Map<String, Object> getModel() {return this.getModelMap();}public void setStatus(HttpStatus status) {this.status = status;}public HttpStatus getStatus() {return this.status;}public ModelAndView addObject(String attributeName, Object attributeValue) {this.getModelMap().addAttribute(attributeName, attributeValue);return this;}public ModelAndView addObject(Object attributeValue) {this.getModelMap().addAttribute(attributeValue);return this;}public ModelAndView addAllObjects(Map<String, ?> modelMap) {this.getModelMap().addAllAttributes(modelMap);return this;}public void clear() {this.view = null;this.model = null;this.cleared = true;}public boolean isEmpty() {return this.view == null && CollectionUtils.isEmpty(this.model);}public boolean wasCleared() {return this.cleared && this.isEmpty();}public String toString() {StringBuilder sb = new StringBuilder("ModelAndView: ");if (this.isReference()) {sb.append("reference to view with name '").append(this.view).append("'");} else {sb.append("materialized View is [").append(this.view).append(']');}sb.append("; model is ").append(this.model);return sb.toString();}
}

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