J2EE配置REST、Spring和Session等相关使用
------ Session包装类，方便在Rest业务类等无状态类中使用（有点违背原则，但是目前我们的验证方案需要如此，又不想影响大部分验证无关的业务）
使用如下：
HttpSession session = RequestFilter.threadLocal.get().getSession();
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
public class RequestFilter implements Filter {
@Override
public void destroy() {
// TODO Auto-generated method stub
}
public static ThreadLocal<HttpServletRequest> threadLocal = new ThreadLocal<HttpServletRequest>();
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain arg2) throws IOException, ServletException {
// TODO Auto-generated method stub
threadLocal.set((HttpServletRequest) arg0);
arg2.doFilter(arg0, arg1);
}
@Override
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
}
------ 把Spring上下文放入静态变量，方便以后使用
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class SpringInitWrap extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
public void init(){
WebApplicationContext wac =WebApplicationContextUtils.getWebApplicationContext(getServletContext());
ServletContext a= wac.getServletContext();
SpringDTO.setCtx(wac);
}
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
}
}
------ 配置Rest
根据自定义的接口在Spring上下文寻找Rest业务类
import javax.ws.rs.core.Application;
public class TyacRestApp extends Application {
// @Override
// public Set<Class<?>> getClasses() {
// Set<Class<?>> classes = new HashSet<Class<?>>();
// classes.add(TyacServiceResource.class);
// classes.add(VMServiceResource.class);
// classes.add(SrvResource.class);
// classes.add(PCSrvResource.class);
// classes.add(ChkSrv.class);
//
// return classes;
// }
@Override
public Set<Object> getSingletons() {
String beans[] = SpringDTO.getCtx().getBeanNamesForType(IREST.class);
Set<Object> result = new HashSet<Object>();
if (beans != null) {
for (int i = 0; i < beans.length; i++) {
String beanName = beans[i];
result.add(SpringDTO.getCtx().getBean(beanName));
}
}
return result;
}
}
Rest业务类示范
@Path("/pcsrv")
public class PCSrvRest implements IREST {
@GET
@Path("list/pc")
@Produces(MediaType.TEXT_PLAIN)
public Response listPC(@Context UriInfo uriInfo) {
JSONArray jsonArr = null;
try {
PCMgr pcMgr = SpringDTO.getCtx().getBean("pcMgr", PCMgr.class);
List<Pc> list = pcMgr.listPC(-1, -1);
jsonArr = JSONArray.fromObject(list);
System.out.println(jsonArr);
} catch (Exception ex) {
ex.printStackTrace();
return Response.status(HttpURLConnection.HTTP_INTERNAL_ERROR).type(MediaType.TEXT_PLAIN)
.entity("Can not read data from server").build();
}
return Response.status(HttpURLConnection.HTTP_OK).type(MediaType.TEXT_PLAIN)
.entity(jsonArr.toString()).build();
}
@GET
@Path("apply/vm/{vmtemplate}/{count}/{cpu}/{memory}/{disk}/{hostname}")
@Produces(MediaType.TEXT_PLAIN)
public Response opApplyVM(@Context UriInfo uriInfo,
@PathParam("vmtemplate") String vmtemplate,
@PathParam("count") String count, @PathParam("cpu") String cpu,
@PathParam("memory") String memory, @PathParam("disk") String disk
, @PathParam("hostname") String hostname) {
...
}
}
----J2EE中配置Spring和启动两个业务类初始化类
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<display-name>cn.tianya.tyac.rest</display-name>
<servlet>
<description>
</description>
<display-name>TyacApp</display-name>
<servlet-name>TyacApp</servlet-name>
<servlet-class>org.apache.wink.server.internal.servlet.RestServlet</servlet-class>
<init-param>
<description>
</description>
<param-name>javax.ws.rs.Application</param-name>
<param-value>cn.tianya.tyac.rest.TyacRestApp</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
<enabled>true</enabled>
<async-supported>false</async-supported>
</servlet>
<servlet>
<description>
</description>
<display-name>SpringInitWrap</display-name>
<servlet-name>SpringInitWrap</servlet-name>
<servlet-class>cn.tianya.tyac.rest.SpringInitWrap</servlet-class>
<load-on-startup>1</load-on-startup>
<enabled>true</enabled>
<async-supported>false</async-supported>
</servlet>
<servlet-mapping>
<servlet-name>TyacApp</servlet-name>
<url-pattern>
/services/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>SpringInitWrap</servlet-name>
<url-pattern>
/test/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<filter>
<filter-name>RequestFilter</filter-name>
<filter-class>cn.tianya.tyac.filter.RequestFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>RequestFilter</filter-name>
<url-pattern>/services/*</url-pattern>
</filter-mapping>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>
/WEB-INF/log4j.xml
</param-value>
</context-param>
</web-app>