ADD file via upload

UserController.java

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+
+package com.example.web;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.Parameter;
+import io.swagger.v3.oas.annotations.tags.Tag;
+
+/**
+ *
+ * @author Archer
+ */
+@Tag(name = "用户管理", description = "用户管理API")
+@RestController
+@RequestMapping(value = "/users")     // 通过这里配置使下面的映射都在/users下
+public class UserController {
+
+    // 创建线程安全的Map，模拟users信息的存储
+    static Map<Long, User> users = Collections.synchronizedMap(new HashMap<>());
+
+    /**
+     * 处理"/users/"的GET请求，用来获取用户列表
+     *
+     * @return
+     */
+    @Operation(summary = "获取用户列表", description = "获取用户列表")
+    @GetMapping("/")
+    public List<User> getUserList() {
+        // 还可以通过@RequestParam从页面中传递参数来进行查询条件或者翻页信息的传递
+        List<User> r = new ArrayList<>(users.values());
+        return r;
+    }
+
+    /**
+     * 处理"/users/"的POST请求，用来创建User
+     *
+     * @param user
+     * @return
+     */
+    @Operation(summary = "创建用户", description = "根据user对象创建用户")
+    @PostMapping("/")
+    public String postUser(@RequestBody User user) {
+        // @RequestBody注解用来绑定通过http请求中application/json类型上传的数据
+        users.put(user.getId(), user);
+        return "success";
+    }
+
+    /**
+     * 处理"/users/{id}"的GET请求，用来获取url中id值的User信息
+     *
+     * @param id
+     * @return
+     */
+    @Operation(summary = "获取用户详细信息", description = "根据url的id来获取用户详细信息")
+    @GetMapping("/{id}")
+    public User getUser(@PathVariable Long id) {
+        // url中的id可通过@PathVariable绑定到函数的参数中
+        return users.get(id);
+    }
+
+    /**
+     * 处理"/users/{id}"的PUT请求，用来更新User信息
+     *
+     * @param id
+     * @param user
+     * @return
+     */
+    @Operation(summary = "更新用户详细信息", 
+        description = "根据url的id来指定更新对象，并根据传过来的user信息来更新用户详细信息",
+        parameters = {
+            @Parameter(name = "id", description = "用户ID", required = true),
+            @Parameter(name = "user", description = "用户详细信息", required = true)
+        })
+    @PutMapping("/{id}")
+    public String putUser(@PathVariable Long id, @RequestBody User user) {
+        User u = users.get(id);
+        u.setName(user.getName());
+        u.setAge(user.getAge());
+        users.put(id, u);
+        return "success";
+    }
+
+    /**
+     * 处理"/users/{id}"的DELETE请求，用来删除User
+     *
+     * @param id
+     * @return
+     */
+    @Operation(summary = "删除用户", description = "根据url的id来指定删除对象")
+    @DeleteMapping("/{id}")
+    public String deleteUser(@PathVariable Long id) {
+        users.remove(id);
+        return "success";
+    }
+
+}