REST风格

@RequestMapping访问路径

 @RequestMapping(value = "/users",method = RequestMethod.POST)

@RequestParam用于接收url地址传参或表单传参

@RequestBody用于接收json数据

@PathVariable用于接收路径参数，使用{参数名称}描述路径参数

    // 用户单个查询
    @RequestMapping(value = "/users/{id}",method = RequestMethod.GET)
    @ResponseBody
    public String getById(@PathVariable Integer id) {
        System.out.println("用户查询,id="+id);
        return "{'module':'用户单个查询'}";
    }

• 后期开发中，发送请求参数超过1个时，以json格式为主，@RequestBody应用较广
• 如果发送非json格式数据，选用@RequestParam接收请求参数
• 采用RESTful进行开发，当参数数量较少时，例如1个，可以采用@PathVariable接收请求路径变量，通常用于传递id值

  @ResponseBody响应体

  @ResponseBody
    public String save() {
        System.out.println("用户保存");
        return "{'module':'用户保存'}";
    }

  ```java package com.tj.controller;

import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.*;

@Controller public class UserController { // 用户保存 @RequestMapping(value = “/users”,method = RequestMethod.POST) @ResponseBody public String save() { System.out.println(“用户保存”); return “{‘module’:’用户保存’}”; }

// 用户多个删除
@RequestMapping(value = "/users",method = RequestMethod.DELETE)
@ResponseBody
public String deleteById() {
    System.out.println("用户多个删除");
    return "{'module':'用户多个删除'}";
}
// 用户单个删除
@RequestMapping(value = "/users/{id}",method = RequestMethod.DELETE)
@ResponseBody
public String deleteById(@PathVariable Integer id) {
    System.out.println("用户单个删除,id="+id);
    return "{'module':'用户单个删除'}";
}
// 用户单个修改
@RequestMapping(value = "/users/{id}",method = RequestMethod.PUT)
@ResponseBody
public String modify(@PathVariable Integer id) {
    System.out.println("用户单个修改,id="+id);
    return "{'module':'用户单个修改'}";
}
// 用户单个查询
@RequestMapping(value = "/users/{id}",method = RequestMethod.GET)
@ResponseBody
public String getById(@PathVariable Integer id) {
    System.out.println("用户查询,id="+id);
    return "{'module':'用户单个查询'}";
}
// 用户保存
@RequestMapping(value = "/users",method = RequestMethod.GET)
@ResponseBody
public String getAll() {
    System.out.println("用户多个查询");
    return "{'module':'用户多个查询'}";
}

}

<a name="RUZNH"></a>
## REST简化写法
```java
package com.tj.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
//@Controller
//@ResponseBody
@RestController
@RequestMapping("/books")
public class BookController {
    // BOOK保存
//    @RequestMapping(method = RequestMethod.POST)
    @PostMapping
    public String save() {
        System.out.println("BOOK保存");
        return "{'module':'BOOK保存'}";
    }
    // BOOK多个删除
//    @RequestMapping(method = RequestMethod.DELETE)
    @DeleteMapping
    public String delete() {
        System.out.println("BOOK多个删除");
        return "{'module':'BOOK多个删除'}";
    }
    // BOOK单个删除
//    @RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
    @DeleteMapping("/{id}")
    public String deleteById(@PathVariable Integer id) {
        System.out.println("BOOK单个删除,id=" + id);
        return "{'module':'BOOK单个删除'}";
    }
    // BOOK单个修改
//    @RequestMapping(value = "/{id}", method = RequestMethod.PUT)
    @PostMapping("/{id}")
    public String modify(@PathVariable Integer id) {
        System.out.println("BOOK单个修改,id=" + id);
        return "{'module':'BOOK单个修改'}";
    }
    // BOOK单个查询
//    @RequestMapping(value = "/{id}", method = RequestMethod.GET)
    @GetMapping("/{id}")
    public String getById(@PathVariable Integer id) {
        System.out.println("BOOK查询,id=" + id);
        return "{'module':'BOOK单个查询'}";
    }
    // BOOK保存
//    @RequestMapping(method = RequestMethod.GET)
    @GetMapping
    public String getAll() {
        System.out.println("BOOK多个查询");
        return "{'module':'BOOK多个查询'}";
    }
}