如何将@RequestBody中任意名称值对的列表映射到java对象(How to map list of arbitrary name value pair from @RequestBody to

如何将@RequestBody中任意名称值对的列表映射到java对象(How to map list of arbitrary name value pair from @RequestBody to java object)

我正在使用Spring boot mvc来构建REST服务。 PUT输入数据就像

[ { "PERSON":"John" }, { "PLACE":"DC" }, { "PERSON":"John" }, { "PERSON":"Joe" }, { "RANDOM NAME 011":"random string" }, { "OTHER RANDOM NAME":"John" } ]

请注意，名称部分是任意的，值部分也是如此。 如何使用spring的自动转换转换它？ 我的代码就像

@RequestMapping(value = "/cleansing", method = RequestMethod.PUT) public ResponseEntity<Void> cleanse(@RequestBody List<CategoryItem> data) {

我知道@RequestBody List<CategoryItem> data部分不对，我不知道如何编写CategoryItem类使其工作。 什么是正确的选择？

I am using Spring boot mvc to build a REST service. The PUT input data are like

[ { "PERSON":"John" }, { "PLACE":"DC" }, { "PERSON":"John" }, { "PERSON":"Joe" }, { "RANDOM NAME 011":"random string" }, { "OTHER RANDOM NAME":"John" } ]

Notice that the name part is arbitrary, so is the value part. How to convert it using spring's automatic conversion? My code is like

@RequestMapping(value = "/cleansing", method = RequestMethod.PUT) public ResponseEntity<Void> cleanse(@RequestBody List<CategoryItem> data) {

I know @RequestBody List<CategoryItem> data part is not right, I don't know how to write CategoryItem class to make it work. What is aright alternative?

最满意答案

你想要它的Object是什么？

正如HTTP PUT有效负载一样，您的签名将作为List<Map<String, String>> ，但诚实地说这有点笨拙。 考虑到您的密钥是随机的，检索值会特别麻烦。 这样的东西可用于处理整个数据集：

@RequestMapping(value = "/cleansing", method = RequestMethod.PUT) public ResponseEntity<Void> cleanse(@RequestBody List<Map<String, String>> data) { for(final Map<String, String> map : data) { for(final Map.Entry<String, String> e : map.entrySet()) { System.out.println("Key: " + e.getKey() + " :: Value: " + e.getValue()); } } }

就像我说的那样......有点笨重。

更灵活的方法是使用Jackson JsonDeserializer以及自定义类：

public class MyClassDeserializer extends JsonDeserializer<MyClass> { public abstract MyClass deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException { //... } } @JsonDeserialize(using=MyClassDeserializer.class) public class MyClass { //... }

然后在控制器方法中使用它：

@RequestMapping(value = "/cleansing", method = RequestMethod.PUT) public ResponseEntity<Void> cleanse(@RequestBody MyClass data) { //... }

What Object do you want it to be?

As the HTTP PUT payload is, your signature would work as a List<Map<String, String>>, but that is a bit clunky to be honest. To retrieve values would be especially cumbersome, considering your keys are random. Something like this would work for processing the whole set of data:

@RequestMapping(value = "/cleansing", method = RequestMethod.PUT) public ResponseEntity<Void> cleanse(@RequestBody List<Map<String, String>> data) { for(final Map<String, String> map : data) { for(final Map.Entry<String, String> e : map.entrySet()) { System.out.println("Key: " + e.getKey() + " :: Value: " + e.getValue()); } } }

Like I was saying...a little bit clunky.

A more flexible approach would be to use a Jackson JsonDeserializer, along with a custom class:

public class MyClassDeserializer extends JsonDeserializer<MyClass> { public abstract MyClass deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException { //... } } @JsonDeserialize(using=MyClassDeserializer.class) public class MyClass { //... }

And then using that in your controller method:

@RequestMapping(value = "/cleansing", method = RequestMethod.PUT) public ResponseEntity<Void> cleanse(@RequestBody MyClass data) { //... }