一个非常简单的MVC
框架，实现了类似Spring MVC的基本功能。
1、包括自动扫描绑定映射路径，只要在
web.xml中指定扫描包，系统启动后会将请求url绑定到指定的处理方法上。如：
在
web.xml中定义如下：
<context-param>
<param-name>ScanPackage</param-name>
<param-value>com
.mvc
.controller</param-value>
</context-param>
容器在启动时候，会将com
.mvc
.controller下所有映射路径绑定处理方法上，假如在扫描包中定义下列类:
import
javax
.imageio
.ImageIO;
import
javax
.servlet
.ServletOutputStream;
import
javax
.servlet
.http
.Cookie;
import
javax
.servlet
.http
.HttpServletRequest;
import
javax
.servlet
.http
.HttpServletResponse;
import
javax
.servlet
.http
.HttpSession;
import com
.hxw
.simple
.light
.mvc
.annotation
.MappingMethodAnnotation;
import com
.hxw
.simple
.light
.mvc
.view
.SimpleModelView;
import com
.mvc
.verification
.VerificationCode;
public class LoginController {
@MappingMethodAnnotation(mappingMethod = "/login
.do")
public String login(HttpServletRequest request, HttpServletResponse response) {
return "login/main";
}
@MappingMethodAnnotation(mappingMethod = "/loginvm
.do")
public SimpleModelView loginView(HttpServletRequest request,
HttpServletResponse response) {
SimpleModelView mv = new SimpleModelView("login/mainmv");
Map<String, String> m = new HashMap<String, String>();
m
.put("beij", "北京");
m
.put("sha", "上海");
m
.put("nanj", "南京");
mv
.setAttribute("city", m);
return mv;
}
@MappingMethodAnnotation(mappingMethod = "/Verify
.do")
public void service(HttpServletRequest arg
0, HttpServletResponse arg1)
throws IOException {
HttpServletRequest request = (HttpServletRequest) arg
0;
HttpServletResponse response = (HttpServletResponse) arg1;
response
.setContentType("image/jpeg");
response
.setHeader("Pragma", "No-cache");
response
.setHeader("Cache-Control", "no-cache");
response
.setDateHeader("Expires",
0);
VerificationCode vCode = new VerificationCode();
BufferedImage bufferImage = vCode
.getImageData();
HttpSession session = request
.getSession();
response
.addCookie(new Cookie("JSSESIONID", session
.getId()));
ServletOutputStream responseOutputStream = response
.getOutputStream();
ImageIO
.write(bufferImage, "JPEG", responseOutputStream);
responseOutputStream
.flush();
responseOutputStream
.close();
}
}
那么在接到url请求如：http://localhost:
8080/TestSimpleMVC/loginvm
.do
会调用指定的方法处理。
2、支持视图定义，在
web.xml定义了视图路径后：
<servlet>
<servlet-name>DelegateForwardServlet</servlet-name>
<servlet-class>com
.hxw
.simple
.light
.mvc
.servlet
.DelegateForwardServlet</servlet-class>
<init-param>
<param-name>prefix</param-name>
<param-value>/
WEB-INF/view/</param-value>
</init-param>
<init-param>
<param-name>suffix</param-name>
<param-value>
.jsp</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>DelegateForwardServlet</servlet-name>
<url-pattern>/SYS_FORWARD_URL
.fo</url-pattern>
</servlet-mapping>
只需在执行完方法后，返回字符串：如return "login/main"就会跳转到指定视图，还可以在视图中用EL表单式访问modelview数据，例子如：
SimpleModelView mv = new SimpleModelView("login/mainmv");
Map<String, String> m = new HashMap<String, String>();
m
.put("beij", "北京");
m
.put("sha", "上海");
m
.put("nanj", "南京");
mv
.setAttribute("city", m);
return mv;
3、支持数据参数自动绑定如：
@ParamAttribute(type = ParamaAttributeType
.REQUEST, key = "userPassword") String s,
@ParamAttribute(type = ParamaAttributeType
.SESSION, key = "11
21
2") String s1,
@ParamAttribute(type = ParamaAttributeType
.SERVLETCONTEXT, key = "3
231
2") String s
2,
@ParamAttribute(type = ParamaAttributeType
.REQUEST, key = "userNames") String[] s3
系统根据参数指定的范围，这指定范围内赋值到参数上，你还可以直接使用
javabean做参数绑定，如：
public class User extends PaginatedHelper {
private static final long serialVersionUID = -
82253
8955115
24
28829L;
private String userName;
private String userPassword;
public User() {
super();
}
public User(String userName, String userPassword) {
super();
this
.userName = userName;
this
.userPassword = userPassword;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this
.userName = userName;
}
public String getUserPassword() {
return userPassword;
}
public void setUserPassword(String userPassword) {
this
.userPassword = userPassword;
}
在方法上带上 Uer user后，属性名称相同的数据就会赋值到
javabean上。不必再使用繁琐的user
.setUserName(request
.getParameter("userName"));
3、简便的jdbc操作
有查询模板QueryTemplate,命名查询NamedQueryTemplate及bean作为参数的BeanQueryTemplate等。支持返回
javabean类型，
javabean列表，
MAP类型，map列表类型，统计结果queryForInt等。
Javalin 2.8.0 已发布，此版本改进了验证功能并简化了语法，增加了 Micrometer 支持，简化了启动日志，并修复了一些重要问题，包括 CORS 对 cookie 的支持等。
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