SpringMVC之处理响应数据

Dear 丶 2023-05-30 09:24 28阅读 0赞

# SpringMVC输出模型数据 #

*  ModelAndView：处理方法返回值类型为ModelAndView时，方法体既可通过该对象添加模型数据
 *  Map与Model：入参为 org.springframework.ui.Model、  
    org.springframework.ui.ModelMap 或 java.uti.Map 时，处理方法返回时，Map中的数据会自动添加到模型中

# ModelAndView #

## 介绍 ##

1）控制器处理方法的返回值如果为ModelAndView，则其既包含视图信息，也包含模型数据信息  
2）添加模型数据:

>  *  MoelAndView addObject(String attributeName, Object attributeValue)
>  *  ModelAndView addAllObject(Map<String, ?> modelMap)

3）设置视图:

>  *  void setView(View view)
>  *  void setViewName(String viewName)

## 代码验证 ##

*  控制器方法  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70]
 *  页面链接  
    ![在这里插入图片描述][20191109132044566.png]
 *  success.jsp中显示数据

time:${
        requestScope.time}

*  断点调试  
    ![在这里插入图片描述][20191109132126577.png]

## 源码解析 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 2]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][2019110913140654.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 4]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 5]

# Map #

## 介绍 ##

1）SpringMVC在内部使用了一个org.springframework.ui.Model接口存储模型数据

2）具体使用步骤

*  **SpringMBVC在调用方法前会创建一个隐含的模型对象作为模型数据的存储容器**
 *  如果方法的入参为Map或者Model类型，SpringMVC会将隐含模型的引用传递给这些入参
 *  在方法体内，开发者可以通过这个入参对象访问到模型中的所有数据，也可以向模型中添加新的属性数据  
    ![在这里插入图片描述][2019110913251556.png]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 6]

## 代码验证 ##

*  控制器  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 7]
 *  页面链接  
    ![在这里插入图片描述][20191109133216187.png]
 *  success.jsp  
    ![在这里插入图片描述][20191109133232394.png]
 *  结果  
    ![在这里插入图片描述][20191109133317524.png]
 *  测试参数类型  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 8]
 *  类层次结构  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 9]
 *  推荐Map，便于框架移植
 *  源码

public class BindingAwareModelMap extends ExtendedModelMap {
        
     
    @Override
    public Object put(String key, Object value) {
        
    removeBindingResultIfNecessary(key, value);
    return super.put(key, value);
    }
     
    @Override
    public void putAll(Map<? extends String, ?> map) {
        
    for (Map.Entry<? extends String, ?> entry : map.entrySet()) {
        
    removeBindingResultIfNecessary(entry.getKey(), entry.getValue());
    }
    super.putAll(map);
    }
     
    private void removeBindingResultIfNecessary(Object key, Object value) {
        
    if (key instanceof String) {
        
    String attributeName = (String) key;
    if (!attributeName.startsWith(BindingResult.MODEL_KEY_PREFIX)) {
        
    String bindingResultKey = BindingResult.MODEL_KEY_PREFIX + attributeName;
    BindingResult bindingResult = (BindingResult) get(bindingResultKey);
    if (bindingResult != null && bindingResult.getTarget() != value) {
        
    remove(bindingResultKey);
    }
    }
    }
    }
    }

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