SpringBoot通過JSON傳遞請求參數(shù)的實例詳解
簡介
本文用示例介紹SpringMVC如何通過JSON格式傳遞入?yún)ⅰ?/p>
JSON格式使用post方式來請求,即:對應(yīng)的注解為:@PostMapping。
@PostMapping注解的方法可以接收1個@RequestBody標記的參數(shù)和多個沒有@RequestBody標記的參數(shù)。
代碼
Entity
User.java
package com.example.demo.entity; import lombok.Data; import java.util.List; @Data public class User { private String name; private Integer age; private String[] password; private List<Integer> scoreArray; }
Account.java
package com.example.demo.entity; import lombok.Data; import java.io.Serializable; @Data public class Account implements Serializable { private String phoneNum; private String[] emails; }
Controller
package com.example.demo.controller; import com.example.demo.entity.User; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import java.util.Arrays; import java.util.List; @RequestMapping("/json") @RestController public class JsonController { @PostMapping("/1") public User setUserNoAnnotation(User user, List<String> password, Integer[] scoreArray) { printUser(user); return user; } @RequestMapping("/2") public User setUserAnnotation(@RequestBody User user) { printUser(user); return user; } @RequestMapping("/3") public User setUserAnnotation1(@RequestBody User user, @RequestParam List<String> password, Integer[] scoreArray) { System.out.println(password); if (scoreArray != null) { System.out.println(Arrays.asList(scoreArray)); } else { System.out.println("scoreArray = null"); } System.out.println(); printUser(user); return user; } @RequestMapping("/4") public User setUserAnnotation2(@RequestBody User user, @RequestBody List<String> password, @RequestBody Integer[] scoreArray) { if (password != null) { System.out.println(password); } else { System.out.println("password = null"); } if (scoreArray != null) { System.out.println(Arrays.asList(scoreArray)); } else { System.out.println("scoreArray = null"); } System.out.println(); printUser(user); return user; } private void printUser(User user){ System.out.println("name : " + user.getName()); System.out.println("password : " + Arrays.asList(user.getPassword())); System.out.println("scoreArray : " + user.getScoreArray()); System.out.println("acount.phoneNum : " + user.getAccount().getPhoneNum()); System.out.println("account.emails : " + Arrays.asList(user.getAccount().getEmails())); } }
測試
為方便測試,我用了knife4j。
測試前提
json的body
{ "name": "Jarvis", "password": [ "ab", "cd" ], "scoreArray": [ 99, 98 ], "account": { "phoneNum": "123", "emails": [ "123@qq.com", "456@163.com" ] } }
正確的用法
1個RequestBody
0個@RequestBody,多個無@RequestBody
1個@RequestBody,多個無@RequestBody
錯誤的用法(會報錯)
多個@RequestBody
后端報錯信息
2022-09-20 22:04:45.857 WARN 3340 --- [nio-8080-exec-1] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.http.converter.HttpMessageNotReadableException: I/O error while reading input message; nested exception is java.io.IOException: Stream closed]
錯誤原因
每個方法只能有一個@RequestBody。使用@RequestBody把請求轉(zhuǎn)化為特定的Object(在最后會關(guān)閉相應(yīng)的流),所以在同一個方法中第二次使用@RequestBody是沒用的,因為流已經(jīng)關(guān)閉。
You cannot use it this way as only one @RequestBody per method is allowed. Using @RequestBody Spring converts incoming request body into the specified object (what closes the stream representing body at the end) so attempting to use @RequestBody second time in the same method makes no sense as stream has been already closed.
不帶@RequestBody參數(shù)類型是List
后端錯誤信息
2022-09-20 23:19:11.044 ERROR 3340 --- [nio-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: No primary or default constructor found for interface java.util.List] with root cause
java.lang.NoSuchMethodException: java.util.List.<init>()
at java.lang.Class.getConstructor0(Class.java:3082) ~[na:1.8.0_201]
at java.lang.Class.getDeclaredConstructor(Class.java:2178) ~[na:1.8.0_201]
...(其他信息)
錯誤原因
不支持非@RequstBody的參數(shù)是List類型。(數(shù)組類型可以)。
到此這篇關(guān)于SpringBoot通過JSON傳遞請求參數(shù)的文章就介紹到這了,更多相關(guān)springboot傳遞請求參數(shù)內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家!
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