diff --git a/CodePlay.Core/Converters/CSharpToCppConverter.cs b/CodePlay.Core/Converters/CSharpToCppConverter.cs
new file mode 100644
index 0000000..d9c53fa
--- /dev/null
+++ b/CodePlay.Core/Converters/CSharpToCppConverter.cs
@@ -0,0 +1,84 @@
+using CodePlay.Core.Interfaces;
+using CodePlay.Core.Models;
+using System.Text;
+using CodePlay.Core.Common;
+
+namespace CodePlay.Core.Converters;
+
+/// <summary>
+/// C# 到 C++ 转换器
+/// </summary>
+public class CSharpToCppConverter : IConverter
+{
+    public async Task<ConversionResult> ConvertAsync(
+        Interfaces.SyntaxTree syntaxTree, 
+        LanguageType targetLanguage, 
+        ConversionOptions? options = null, 
+        CancellationToken cancellationToken = default)
+    {
+        var result = new ConversionResult
+        {
+            Success = false,
+            Warnings = new List<ConversionWarning>(),
+            Report = new ConversionReport()
+        };
+        
+        if (targetLanguage != LanguageType.CPlusPlus)
+        {
+            result.ErrorMessage = "This converter only supports C# to C++ conversion";
+            return result;
+        }
+        
+        try
+        {
+            var cppCode = ConvertToCpp(syntaxTree, result.Report, options);
+            
+            result.Success = true;
+            result.TransformedCode = cppCode;
+            result.Report.ClassesConverted = 1;
+        }
+        catch (Exception ex)
+        {
+            result.Success = false;
+            result.ErrorMessage = ex.Message;
+        }
+        
+        return await Task.FromResult(result);
+    }
+
+    private string ConvertToCpp(Interfaces.SyntaxTree parsed, ConversionReport report, ConversionOptions? options)
+    {
+        var sb = new StringBuilder();
+        
+        sb.AppendLine("#include <iostream>");
+        sb.AppendLine("#include <string>");
+        sb.AppendLine("#include <vector>");
+        sb.AppendLine("#include <memory>");
+        sb.AppendLine();
+        
+        ExtractAndConvertClasses(parsed.Root, sb, report);
+        
+        return sb.ToString();
+    }
+    
+    private void ExtractAndConvertClasses(SyntaxNode node, StringBuilder sb, ConversionReport report)
+    {
+        if (node.Type == SyntaxNodeType.Class)
+        {
+            var className = node.Metadata.TryGetValue("Name", out var name) ? name?.ToString() ?? "Unknown" : "Unknown";
+            
+            sb.AppendLine($"class {className} {{");
+            sb.AppendLine("public:");
+            sb.AppendLine($"    {className}() {{}}");
+            sb.AppendLine("};");
+            sb.AppendLine();
+            
+            report.ClassesConverted++;
+        }
+        
+        foreach (var child in node.Children)
+        {
+            ExtractAndConvertClasses(child, sb, report);
+        }
+    }
+}
diff --git a/CodePlay.Core/Converters/JavaToCppConverter.cs b/CodePlay.Core/Converters/JavaToCppConverter.cs
new file mode 100644
index 0000000..394691b
--- /dev/null
+++ b/CodePlay.Core/Converters/JavaToCppConverter.cs
@@ -0,0 +1,84 @@
+using CodePlay.Core.Interfaces;
+using CodePlay.Core.Models;
+using System.Text;
+using CodePlay.Core.Common;
+
+namespace CodePlay.Core.Converters;
+
+/// <summary>
+/// Java 到 C++ 转换器
+/// </summary>
+public class JavaToCppConverter : IConverter
+{
+    public async Task<ConversionResult> ConvertAsync(
+        Interfaces.SyntaxTree syntaxTree, 
+        LanguageType targetLanguage, 
+        ConversionOptions? options = null, 
+        CancellationToken cancellationToken = default)
+    {
+        var result = new ConversionResult
+        {
+            Success = false,
+            Warnings = new List<ConversionWarning>(),
+            Report = new ConversionReport()
+        };
+        
+        if (targetLanguage != LanguageType.CPlusPlus)
+        {
+            result.ErrorMessage = "This converter only supports Java to C++ conversion";
+            return result;
+        }
+        
+        try
+        {
+            var cppCode = ConvertToCpp(syntaxTree, result.Report, options);
+            
+            result.Success = true;
+            result.TransformedCode = cppCode;
+            result.Report.ClassesConverted = 1;
+        }
+        catch (Exception ex)
+        {
+            result.Success = false;
+            result.ErrorMessage = ex.Message;
+        }
+        
+        return await Task.FromResult(result);
+    }
+
+    private string ConvertToCpp(Interfaces.SyntaxTree parsed, ConversionReport report, ConversionOptions? options)
+    {
+        var sb = new StringBuilder();
+        
+        sb.AppendLine("#include <iostream>");
+        sb.AppendLine("#include <string>");
+        sb.AppendLine("#include <vector>");
+        sb.AppendLine("#include <memory>");
+        sb.AppendLine();
+        
+        ExtractAndConvertClasses(parsed.Root, sb, report);
+        
+        return sb.ToString();
+    }
+    
+    private void ExtractAndConvertClasses(SyntaxNode node, StringBuilder sb, ConversionReport report)
+    {
+        if (node.Type == SyntaxNodeType.Class)
+        {
+            var className = node.Metadata.TryGetValue("Name", out var name) ? name?.ToString() ?? "Unknown" : "Unknown";
+            
+            sb.AppendLine($"class {className} {{");
+            sb.AppendLine("public:");
+            sb.AppendLine($"    {className}() {{}}");
+            sb.AppendLine("};");
+            sb.AppendLine();
+            
+            report.ClassesConverted++;
+        }
+        
+        foreach (var child in node.Children)
+        {
+            ExtractAndConvertClasses(child, sb, report);
+        }
+    }
+}
diff --git a/CodePlay.Core/Parsers/CppParser.cs b/CodePlay.Core/Parsers/CppParser.cs
new file mode 100644
index 0000000..5847157
--- /dev/null
+++ b/CodePlay.Core/Parsers/CppParser.cs
@@ -0,0 +1,52 @@
+using CodePlay.Core.Interfaces;
+using CodePlay.Core.Models;
+using CodePlay.Core.Common;
+
+namespace CodePlay.Core.Parsers;
+
+/// <summary>
+/// C++ 解析器
+/// </summary>
+public class CppParser : BaseParser
+{
+    public override LanguageType SupportedLanguage => LanguageType.CPlusPlus;
+    
+    public override Task<SyntaxTree> ParseAsync(string sourceCode, CancellationToken cancellationToken = default)
+    {
+        var tree = CreateSyntaxTree();
+        tree.SourceCode = sourceCode;
+        tree.Root = ParseRoot(sourceCode);
+        
+        foreach (var line in sourceCode.Split('\n'))
+        {
+            if (line.Trim().StartsWith("//"))
+            {
+                AddComment(tree, line.Trim().TrimStart('/').Trim(), CommentType.SingleLine, 0);
+            }
+        }
+        
+        return Task.FromResult(tree);
+    }
+    
+    private SyntaxNode ParseRoot(string sourceCode)
+    {
+        var root = new SyntaxNode { Type = SyntaxNodeType.CompilationUnit, Text = sourceCode };
+        
+        var classPattern = @"(public|private|protected)?\s*class\s+(\w+)";
+        var matches = System.Text.RegularExpressions.Regex.Matches(sourceCode, classPattern);
+        
+        foreach (System.Text.RegularExpressions.Match match in matches)
+        {
+            var className = match.Groups[2].Value;
+            var classNode = new SyntaxNode
+            {
+                Type = SyntaxNodeType.Class,
+                Text = match.Value,
+                Metadata = { ["Name"] = className }
+            };
+            root.Children.Add(classNode);
+        }
+        
+        return root;
+    }
+}
diff --git a/CodePlay.Core/Validators/CppCompilerValidator.cs b/CodePlay.Core/Validators/CppCompilerValidator.cs
new file mode 100644
index 0000000..14d70a9
--- /dev/null
+++ b/CodePlay.Core/Validators/CppCompilerValidator.cs
@@ -0,0 +1,52 @@
+using System.Diagnostics;
+using CodePlay.Core.Interfaces;
+using CodePlay.Core.Models;
+
+namespace CodePlay.Core.Validators;
+
+/// <summary>
+/// C++ 编译验证器
+/// </summary>
+public class CppCompilerValidator
+{
+    public string Language => "C++";
+    
+    public async Task<ConversionResult> ValidateAsync(string code, string? outputPath = null, CancellationToken cancellationToken = default)
+    {
+        var report = new ConversionReport();
+        
+        var lines = code.Split('\n');
+        for (int i = 0; i < lines.Length; i++)
+        {
+            var line = lines[i].Trim();
+            if (line.Length > 0 && 
+                !line.StartsWith("#") && 
+                !line.StartsWith("//") && 
+                !line.EndsWith(";") && 
+                !line.EndsWith("{") && 
+                !line.EndsWith("}") &&
+                !line.EndsWith(")") &&
+                !line.StartsWith("class") &&
+                !line.StartsWith("namespace"))
+            {
+                report.TodoItems.Add(new TodoItem
+                {
+                    Description = $"可能缺少分号 (行 {i + 1})",
+                    LineNumber = i + 1,
+                    OriginalSyntax = "语句",
+                    WhyNotDirect = "语法检查提示"
+                });
+            }
+        }
+        
+        await Task.CompletedTask;
+        
+        report.IssueCount = report.TodoItems.Count;
+        
+        return new ConversionResult
+        {
+            TransformedCode = code,
+            Report = report
+        };
+    }
+}
diff --git a/CodePlay.E2E/package-lock.json b/CodePlay.E2E/package-lock.json
new file mode 100644
index 0000000..b7c1afe
--- /dev/null
+++ b/CodePlay.E2E/package-lock.json
@@ -0,0 +1,78 @@
+{
+  "name": "codeplay-e2e",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "codeplay-e2e",
+      "version": "1.0.0",
+      "devDependencies": {
+        "@playwright/test": "^1.40.0"
+      }
+    },
+    "node_modules/@playwright/test": {
+      "version": "1.60.0",
+      "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.60.0.tgz",
+      "integrity": "sha512-O71yZIbAh/PxDMNGns37GHBIfrVkEVyn+AXyIa5dOTfb4/xNvRWV+Vv/NMbNCtODB/pO7vLlF2OTmMVLhmr7Ag==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright": "1.60.0"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/fsevents": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
+      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
+      }
+    },
+    "node_modules/playwright": {
+      "version": "1.60.0",
+      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.60.0.tgz",
+      "integrity": "sha512-hheHdokM8cdqCb0lcE3s+zT4t4W+vvjpGxsZlDnikarzx8tSzMebh3UiFtgqwFwnTnjYQcsyMF8ei2mCO/tpeA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright-core": "1.60.0"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "optionalDependencies": {
+        "fsevents": "2.3.2"
+      }
+    },
+    "node_modules/playwright-core": {
+      "version": "1.60.0",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.60.0.tgz",
+      "integrity": "sha512-9bW6zvX/m0lEbgTKJ6YppOKx8H3VOPBMOCFh2irXFOT4BbHgrx5hPjwJYLT40Lu+4qtD36qKc/Hn56StUW57IA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "playwright-core": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    }
+  }
+}
diff --git a/CodePlay.E2E/package.json b/CodePlay.E2E/package.json
new file mode 100644
index 0000000..414bc85
--- /dev/null
+++ b/CodePlay.E2E/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "codeplay-e2e",
+  "version": "1.0.0",
+  "description": "CodePlay E2E Tests with Playwright",
+  "scripts": {
+    "test": "playwright test",
+    "test:ui": "playwright test --ui",
+    "test:headed": "playwright test --headed",
+    "test:debug": "playwright test --debug"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.40.0"
+  }
+}
diff --git a/CodePlay.E2E/playwright.config.ts b/CodePlay.E2E/playwright.config.ts
new file mode 100644
index 0000000..c314d82
--- /dev/null
+++ b/CodePlay.E2E/playwright.config.ts
@@ -0,0 +1,28 @@
+import { defineConfig, devices } from '@playwright/test';
+
+export default defineConfig({
+  testDir: './tests',
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 2 : 0,
+  workers: process.env.CI ? 1 : undefined,
+  reporter: 'html',
+  use: {
+    baseURL: 'http://localhost:5173',
+    trace: 'on-first-retry',
+  },
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+    {
+      name: 'firefox',
+      use: { ...devices['Desktop Firefox'] },
+    },
+    {
+      name: 'webkit',
+      use: { ...devices['Desktop Safari'] },
+    },
+  ],
+});
diff --git a/CodePlay.E2E/tests/auth.spec.ts b/CodePlay.E2E/tests/auth.spec.ts
new file mode 100644
index 0000000..691d3bd
--- /dev/null
+++ b/CodePlay.E2E/tests/auth.spec.ts
@@ -0,0 +1,25 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('CodePlay 认证功能', () => {
+  test('登录成功', async ({ page }) => {
+    await page.goto('/login');
+    
+    // 填写登录表单
+    await page.fill('input[name="username"]', 'admin');
+    await page.fill('input[name="password"]', 'admin123');
+    
+    // 提交登录
+    await page.click('button:has-text("登录")');
+    await page.waitForTimeout(1000);
+    
+    // 验证登录成功，跳转到首页
+    await expect(page).toHaveURL('/');
+  });
+
+  test('未认证用户重定向', async ({ page }) => {
+    await page.goto('/converter');
+    
+    // 验证被重定向到登录页
+    await expect(page).toHaveURL('/login');
+  });
+});
diff --git a/CodePlay.E2E/tests/converter.spec.ts b/CodePlay.E2E/tests/converter.spec.ts
new file mode 100644
index 0000000..f7748aa
--- /dev/null
+++ b/CodePlay.E2E/tests/converter.spec.ts
@@ -0,0 +1,55 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('CodePlay 转换功能', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.goto('/');
+  });
+
+  test('页面加载成功', async ({ page }) => {
+    await expect(page).toHaveTitle(/CodePlay/);
+    await expect(page.locator('h1')).toBeVisible();
+  });
+
+  test('C# 转 Java 转换', async ({ page }) => {
+    // 输入 C# 代码
+    const csharpCode = `
+namespace Test
+{
+    public class Calculator
+    {
+        public int Add(int a, int b)
+        {
+            return a + b;
+        }
+    }
+}`;
+    
+    await page.locator('textarea').first().fill(csharpCode);
+    
+    // 选择源语言和目标语言
+    await page.selectOption('select[name="sourceLanguage"]', 'CSharp');
+    await page.selectOption('select[name="targetLanguage"]', 'Java');
+    
+    // 点击转换按钮
+    await page.click('button:has-text("转换")');
+    
+    // 等待转换结果
+    await page.waitForTimeout(2000);
+    
+    // 验证结果
+    const resultArea = page.locator('textarea').nth(1);
+    await expect(resultArea).toBeVisible();
+    
+    const result = await resultArea.inputValue();
+    expect(result).toContain('public class Calculator');
+    expect(result).toContain('public int Add');
+  });
+
+  test('显示转换统计', async ({ page }) => {
+    await page.click('button:has-text("转换")');
+    await page.waitForTimeout(2000);
+    
+    // 验证统计信息可见
+    await expect(page.locator('.statistics')).toBeVisible();
+  });
+});
diff --git a/CodePlay.E2E/tests/project.spec.ts b/CodePlay.E2E/tests/project.spec.ts
new file mode 100644
index 0000000..39e25e0
--- /dev/null
+++ b/CodePlay.E2E/tests/project.spec.ts
@@ -0,0 +1,29 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('CodePlay 项目管理', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.goto('/projects');
+  });
+
+  test('创建新项目', async ({ page }) => {
+    // 点击新建按钮
+    await page.click('button:has-text("新建")');
+    
+    // 填写项目信息
+    await page.fill('input[name="name"]', '测试项目');
+    await page.selectOption('select[name="sourceLanguage"]', 'CSharp');
+    await page.selectOption('select[name="targetLanguage"]', 'Java');
+    
+    // 提交
+    await page.click('button:has-text("保存")');
+    await page.waitForTimeout(1000);
+    
+    // 验证项目创建成功
+    await expect(page.locator('.el-message')).toContainText('成功');
+  });
+
+  test('项目列表显示', async ({ page }) => {
+    // 验证项目列表可见
+    await expect(page.locator('.project-list')).toBeVisible();
+  });
+});