Java使用PUT提交请求错误码400及415解决方案

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0. 初始状态

• 前端

<script>$("#btn").on("click", function (e) {$.ajax({url: "/xxx",type: "put",data: {'id': 1,'name': '你猜'}})});
</script>

• 后端

 @PutMapping("/test")public String updateTaskCordName(@RequestParam(name="id") int id, @RequestParam(name="name") String name) {//业务代码
}

1. 请求报错 400 Required int parameter ‘id’ is not present

• 问题描述

error: "Bad Request"
message: "Required int parameter 'id' is not present"
path: "/test"
status: 400

• 解决方案 更改后端代码

 @PutMapping("/test")public String updateTaskCordName(@RequestBody Map<String, String> map) {Integer id = Integer.parseInt(map.get("id"));String name = map.get("name");//业务代码
}

2. 415 不支持 'application/x-www-form-urlencoded;charset=UTF-8

• 问题描述

  error: "Unsupported Media Type"
  message: "Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported"
  path: "/test"
  status: 415
  

• 解决方案
  ajax 请求添加配置参数 contentType: "application/json; charset=utf-8",
  即，前端

  <script>$("#btn").on("click", function (e) {$.ajax({url: "/xxx",type: "put",contentType: "application/json; charset=utf-8",data: {'id': 1,'name': '你猜'}})});
  </script>
  

3. 400 Unrecognized token ‘id’: was expecting (‘true’, ‘false’ or ‘null’)

• 问题描述

  error: "Bad Request"
  message: "JSON parse error: Unrecognized token 'id': was expecting ('true', 'false' or 'null'); nested exception is com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'id': was expecting ('true', 'false' or 'null')↵ at [Source: (PushbackInputStream); line: 1, column: 4]"
  path: "/taskCord"
  status: 400
  

• 解决方案 data参数调用 JSON.stringify()函数

  <script>$("#btn").on("click", function (e) {$.ajax({url: "/xxx",type: "put",contentType: "application/json; charset=utf-8",data: JSON.stringify({'id': 1,'name': '你猜'})})});
  </script>
  

附：

4. delete操作

@DeleteMapping("/db/{id}")
public String deleteById(@PathVariable(name="id") int id) {//业务代码
}

<script>$("#btn").on("click", function (e) {$.ajax({url: "/db"+1,type: "delete"	          })});
</script>

Spring Boot Rest访问示例

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