帮我写一段基于ssm框架的博客代码

好的，我可以回答这个问题。以下是一个基于SSM框架的博客代码示例：

@Controller
@RequestMapping("/blog")
public class BlogController {

@Autowired
private BlogService blogService;

@RequestMapping("/list")
public ModelAndView list() {
List<Blog> blogs = blogService.getAllBlogs();
ModelAndView modelAndView = new ModelAndView("blog/list");
modelAndView.addObject("blogs", blogs);
return modelAndView;
}

@RequestMapping("/add")
public String add() {
return "blog/add";
}

@RequestMapping("/save")
public String save(Blog blog) {
blogService.saveBlog(blog);
return "redirect:/blog/list";
}

@RequestMapping("/edit/{id}")
public ModelAndView edit(@PathVariable("id") Long id) {
Blog blog = blogService.getBlogById(id);
ModelAndView modelAndView = new ModelAndView("blog/edit");
modelAndView.addObject("blog", blog);
return modelAndView;
}

@RequestMapping("/update")
public String update(Blog blog) {
blogService.updateBlog(blog);
return "redirect:/blog/list";
}

@RequestMapping("/delete/{id}")
public String delete(@PathVariable("id") Long id) {
blogService.deleteBlog(id);
return "redirect:/blog/list";
}
}

@Service
public class BlogServiceImpl implements BlogService {

@Autowired
private BlogMapper blogMapper;

@Override
public List<Blog> getAllBlogs() {
return blogMapper.getAllBlogs();
}

@Override
public Blog getBlogById(Long id) {
return blogMapper.getBlogById(id);
}

@Override
public void saveBlog(Blog blog) {
blogMapper.saveBlog(blog);
}

@Override
public void updateBlog(Blog blog) {
blogMapper.updateBlog(blog);
}

@Override
public void deleteBlog(Long id) {
blogMapper.deleteBlog(id);
}
}

@Repository
public interface BlogMapper {

List<Blog> getAllBlogs();

Blog getBlogById(Long id);

void saveBlog(Blog blog);

void updateBlog(Blog blog);

void deleteBlog(Long id);
}

以上是一个简单的基于SSM框架的博客代码示例，包括了Controller、Service和Mapper三个层次的代码。