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springmvc restful service

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SpringMVC 的restful 服务 开发,和设计
===

目前基于SpringMVC的技术架构在企业技术里面很流行.很多项目,都基于之类来构建后台架构.
我使用简化版本的SpringMVC,只是用了MVC,快速设计和开发Restful的服务而已.
什么是Model,什么是View,我都不关心,我只关心出数据服务(REST).
比如如下代码:
```java
@RequestMapping(value = "/echo", method = RequestMethod.GET)
@ResponseBody
public String echo(){
	
	return "{ status:0, describe:'ok' } ";
	
	
}
```
	
请求的是 url是  /echo 的服务.Method是 GET,返回的是整个ResponseBody.
所以我返回的json 就是 这个string 类型的.
如此简单,其他的配置文件,都采用默认配置,用标注,自动加载各种bean.

另外我还提供改进版本的方式,我引入了 Groovy,进行简化编程.
我可以提供一个Controller:
```java
@RequestMapping("/user")
    public @ResponseBody String getUser() {
        return """
        {
            "name":"bingo",
            "age":34,
            "address":"nanjing"
        }
        """;
    }
```

```java
@RequestMapping("/user2")
public @ResponseBody String getUser2() {
	def user = new JsonBuilder();
	def test ="AAAA"
	user {
		name 'bingo'
		age  34
		credit  test
		address(
				city: 'nanjing',
				country: 'china',
				zip: 210012
			)  
		married true
		
		departments 'TAP','Design dept.','Project Manager dept.'
	}
	
	//user.pet name: 'dog'
	
	user.toPrettyString()
}
```

打印的json为：

```json
{
    "name": "bingo",
    "age": 34,
    "credit": "AAAA",
    "address": {
        "city": "nanjing",
        "country": "china",
        "zip": 210012
    },
    "married": true,
    "departments": [
        "TAP",
        "Design dept.",
        "Project Manager dept."
    ]
}
```

也可以用Jackson的 json库，也可以用阿里的FastJson库。

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