blocks|key|4264913|text|手动完成此操作的两种方式:+1)我想知道在您的项目中是否有访问HttpServletRequest对象的权限。如果是这种情况，您可以使用方法request.getParameter(nameParam)来填充所需的对象。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4264914|2)使用beanutils库，使用BeanUtils.copyProperties(+dest，source)方法，在控制器中使用"@RequestParam+Map+source“，并替换您想要填充的dest对象|4264915|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Two ways of doing this manually:
1) I wonder if in your project you have access to HttpServletRequest object. If that is the case, you can use the method request.getParameter(nameParam) to populate the object that you need.

2) Use beanutils library and using the method
BeanUtils.copyProperties(dest, source)
Using "@RequestParam Map source" in your controller and replacing the dest object you want fill

blocks|key|4264956|text|我在this+link上找到了答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4264957|公共静态空applyMapOntoInstance(对象实例，映射属性){|4264958|++++if+(properties+!=+null+&&+!properties.isEmpty())+{
++++++++BeanWrapper+beanWrapper+=+PropertyAccessorFactory.forBeanPropertyAccess(instance);
++++++++beanWrapper.setAutoGrowNestedPaths(true);

++++++++for+(Iterator<?>+iterator+=+properties.entrySet().iterator();+iterator.hasNext();)+{
++++++++++++Map.Entry<String,+?>+entry+=+(Map.Entry<String,+?>)+iterator.next();
++++++++++++String+propertyName+=+entry.getKey();
++++++++++++if+(beanWrapper.isWritableProperty(propertyName))+{
++++++++++++++++beanWrapper.setPropertyValue(propertyName,+entry.getValue());
++++++++++++}
++++++++}
++++}
}|code-block|syntax|javascript|4264959|我的控制器方法现在看起来像：|4264960|@GetMapping("/public/properties")
@Timed
public+ResponseEntity<List<Property>>+getAllPropertiesNested(HttpServletRequest+request)+throws+IllegalAccessException,+NoSuchMethodException,+InvocationTargetException+{


++++HttpHeaders+headers+=+null;
++++if+(requestContains("bedrooms",+request))+{

++++++++HousePropertyCriteria+housePropertyCriteria+=+new+HousePropertyCriteria();
++++++++applyMapOntoInstance(housePropertyCriteria,+request.getParameterMap());

++++++++Page<HouseProperty>+page+=+housePropertyQueryService.findByCriteriaNested(housePropertyCriteria,+pageable);
++++++++headers+=+PaginationUtil.generatePaginationHttpHeaders(page,+"/api/public/properties");
++++++++return+new+ResponseEntity(page.getContent(),+headers,+HttpStatus.OK);

++++}+else+{
++++++++Page<Property>+page+=+propertyQueryService.findByCriteriaNested(criteria,+pageable);
++++++++headers+=+PaginationUtil.generatePaginationHttpHeaders(page,+"/api/public/properties");
++++++++return+new+ResponseEntity(page.getContent(),+headers,+HttpStatus.OK);
++++}


}|4264961|entityMap|0|LINK|mutability|MUTABLE|url|https://www.programcreek.com/java-api-examples/index.php?api=org.springframework.beans.BeanWrapper^0|2|9|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

I found the answer on <a href="https://www.programcreek.com/java-api-examples/index.php?api=org.springframework.beans.BeanWrapper" rel="nofollow noreferrer" title="here">this link</a>. 

public static void applyMapOntoInstance(Object instance, Map properties) {

<pre><code> if (properties != null &amp;&amp; !properties.isEmpty()) {
 BeanWrapper beanWrapper = PropertyAccessorFactory.forBeanPropertyAccess(instance);
 beanWrapper.setAutoGrowNestedPaths(true);

 for (Iterator&lt;?&gt; iterator = properties.entrySet().iterator(); iterator.hasNext();) {
 Map.Entry&lt;String, ?&gt; entry = (Map.Entry&lt;String, ?&gt;) iterator.next();
 String propertyName = entry.getKey();
 if (beanWrapper.isWritableProperty(propertyName)) {
 beanWrapper.setPropertyValue(propertyName, entry.getValue());
 }
 }
 }
}
</code></pre>

My controller method now looks like:

<pre><code>@GetMapping("/public/properties")
@Timed
public ResponseEntity&lt;List&lt;Property&gt;&gt; getAllPropertiesNested(HttpServletRequest request) throws IllegalAccessException, NoSuchMethodException, InvocationTargetException {


 HttpHeaders headers = null;
 if (requestContains("bedrooms", request)) {

 HousePropertyCriteria housePropertyCriteria = new HousePropertyCriteria();
 applyMapOntoInstance(housePropertyCriteria, request.getParameterMap());

 Page&lt;HouseProperty&gt; page = housePropertyQueryService.findByCriteriaNested(housePropertyCriteria, pageable);
 headers = PaginationUtil.generatePaginationHttpHeaders(page, "/api/public/properties");
 return new ResponseEntity(page.getContent(), headers, HttpStatus.OK);

 } else {
 Page&lt;Property&gt; page = propertyQueryService.findByCriteriaNested(criteria, pageable);
 headers = PaginationUtil.generatePaginationHttpHeaders(page, "/api/public/properties");
 return new ResponseEntity(page.getContent(), headers, HttpStatus.OK);
 }


}
</code></pre>

I need to know how Spring boot maps the request parameters in the URL to a POJO at run time. 

Here is an example URL with parameters

<pre><code> http://localhost:8080/api/public/properties?serviceType.in=SALE&amp;title.contains=some text&amp;price.greaterOrEqualThan=500&amp;price.lessOrEqualThan=50000&amp;propertyType.in=HOUSE&amp;locationId.in=1,2&amp;landSize.greaterOrEqualThan=100&amp;landSize.lessOrEqualThan=1000&amp;bedrooms.greaterOrEqualThan=2&amp;bedrooms.lessOrEqualThan=5&amp;bathrooms.greaterOrEqualThan=1&amp;bathrooms.lessOrEqualThan=3&amp;ageType.in=BRAND_NEW
</code></pre>

I have a number of Criteria classes that all extends PropertyCriteria class. To give an example, if the request contains no parameters, I want the controller to use the PropertyCriteria. If the request contains a bedrooms parameter, I want the controller to use the HousePropertyCriteria and so on. See controller method example below. 

<pre><code>@GetMapping("/public/properties")
public ResponseEntity&lt;List&lt;Property&gt;&gt; 
 getAllPropertiesNested(HttpServletRequest request) {

 if (condition1 == true) {
 EntityOnePropertyCriteria c1 = new EntityOnePropertyCriteria();
 //populate c1 using request object

 } else {
 EntityTwoPropertyCriteria c2 = new EntityTwoPropertyCriteria();
 //populate c2 using request object
 }

}
</code></pre>

Spring - how to map request parameters in the URL to a POJO at run time?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我需要知道Spring boot如何在运行时将URL中的请求参数映射到POJO。以下是一个带有参数的示例URL    http://localhost:8080/api/public/properties?serviceType.in=SALE&title.contains=some text&price.greate...

问Spring -如何在运行时将URL中的请求参数映射到POJO？
EN

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Spring -如何在运行时将URL中的请求参数映射到POJO？EN

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Spring -如何在运行时将URL中的请求参数映射到POJO？
EN