[Developer] #424 add Java MCP client demo tab

src/main/java/com/cloudhandson/vpdbackoffice/web/McpClientDemoController.java

@@ -0,0 +1,64 @@
+package com.cloudhandson.vpdbackoffice.web;
+
+import com.cloudhandson.vpdbackoffice.service.McpClientDemoService;
+import com.cloudhandson.vpdbackoffice.service.McpToolRegistry;
+import jakarta.servlet.http.HttpServletRequest;
+import java.util.List;
+import org.springframework.dao.DataAccessException;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
+
+@Controller
+public class McpClientDemoController {
+
+  private final McpToolRegistry toolRegistry;
+  private final McpClientDemoService demoService;
+
+  public McpClientDemoController(McpToolRegistry toolRegistry, McpClientDemoService demoService) {
+    this.toolRegistry = toolRegistry;
+    this.demoService = demoService;
+  }
+
+  @GetMapping("/mcp-client-demo")
+  public String page(Model model) {
+    addTools(model);
+    return "mcp-client-demo";
+  }
+
+  @PostMapping("/mcp-client-demo")
+  public String run(
+      @RequestParam(defaultValue = "vpd-live") String contextPath,
+      @RequestParam(defaultValue = "") String toolName,
+      @RequestParam(defaultValue = "") String bearerToken,
+      @RequestParam(defaultValue = "50") int limit,
+      HttpServletRequest request,
+      Model model
+  ) {
+    addTools(model);
+    try {
+      String serverOrigin = ServletUriComponentsBuilder.fromRequestUri(request)
+          .replacePath(null)
+          .replaceQuery(null)
+          .build()
+          .toUriString();
+      model.addAttribute("result", demoService.run(serverOrigin, contextPath, toolName, bearerToken, limit));
+    } catch (Exception e) {
+      model.addAttribute("errorMessage", e.getMessage());
+    }
+    return "fragments/mcp-client-demo-result :: result";
+  }
+
+  private void addTools(Model model) {
+    try {
+      model.addAttribute("tools", toolRegistry.listTools());
+    } catch (DataAccessException e) {
+      RuntimeErrorMessage message = RuntimeErrorMessages.dataAccess(e);
+      model.addAttribute("tools", List.of());
+      model.addAttribute("runtimeError", message);
+    }
+  }
+}