How to use Java @PostMapping and @GetMapping methods

1. Use the post method to call

1. If the front-end parameter is an object,

such as {id:‘1’,name:‘2222’}

To receive back-end parameters, you need to use @RequestBody ApplyObject applyObject

The requestBody is followed by an entity class

@PostMapping(value = "/generatedData")
public Result<?> generatedData(@RequestBody ApplyObject applyObject) throws Exception {
}		

If you don’t want to use the entity class to receive it, you can use JSONObject to receive this package package com.alibaba.fastjson;

@PostMapping(value = "/generatedData")
public Result<?> generatedData(@RequestBody JSONObject jsonObject) throws Exception {
    String id = jsonObject.getString("id");
    String name = jsonObject.getString("name");
//这样也是可以拿到你想要的值的
}

2. If the parameter passed by the front end is a spliced ​​string with ?

such as xxx/generatedData?id=1&name=222

To receive parameters at the back end, you need to use @RequestParam("id") String id

@RequestParam plus the corresponding field name after the question mark

@PostMapping(value = "/generatedData")
public Result<?> generatedData( @RequestParam("id") String id, 
								@RequestParam("name") String name) throws Exception {
}

2. Use the get method

1. If the front-end parameter is an object,

such as {id:‘1’,name:‘2222’}

If the back-end parameter is received, the It is an entity class

@GetMapping(value = "/generatedData")
public Result<?> generatedData(ApplyObject applyObject) throws Exception {
}

2. If the parameter passed by the front end is a spliced ​​string with ?

such as xxx/generatedData?id=1&name=222

To receive parameters at the backend, you need to use @RequestParam("id") String id

@RequestParam plus the corresponding field name after the question mark

@GetMapping(value = "/generatedData")
public Result<?> generatedData( @RequestParam("id") String id, 
								@RequestParam("name") String name) throws Exception {
}

3. The path of the front-end passed parameters exists Placeholder

such as xxx/generatedData/id, the specific value placed in the id

If you want to receive back-end parameters, you need to use @PathVariable String id

@GetMapping(value = "/generatedData/{id}")
public Result<?> generatedData(@PathVariable("id") String id) throws Exception {
}

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