Changes between Initial Version and Version 1 of 2017_1

Timestamp:

01/16/2017 01:09:29 PM (9 years ago)

Author:

wuyuanbo

Comment:

--

2017_1

@@ +1 @@
+1.java类中EnvUtils使用优化
+  在Env实例依赖servlet的过滤器，其功能也主要是用于处理servlet请求的工具类，在非Controller类或jsp中使用可能会造成错误。
+
+{{{
+//evn过滤器代码 org.gelivable.web.EnvFilter : 62
+public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
+            throws IOException, ServletException {
+        ......
+        Env env = EnvUtils.getEnv();
+        envMap.put(env, "");
+        try {
+            //下面三个变量只有servlet处理请求时才会被实例化
+            env.setRequest((HttpServletRequest) request);
+            env.setResponse((HttpServletResponse) response);
+            env.setServletContext(servletContext);
+
+            request.setAttribute("env", env);
+
+            chain.doFilter(request, response);
+
+        } 
+        ......
+    }
+}}}
+在聚超值项目中，entity类（service偶尔也会出现）中经常会用env获取service或dao类实例的代码。
+
+{{{
+public class User {
+        ......
+        public UserPurchasingInfo getInfo() {
+                ......
+                info = EnvUtils.getEnv().getBean(GeliDao.class).find(UserPurchasingInfo.class, this.userId);
+                ......
+        }
+        ......
+}
+}}}
+这种代码至少在三种情况下调用会出现错误：[[BR]]
+1.在单元测试中[[BR]]
+2.不依赖于servlet的定时任务中[[BR]]
+3.
+{{{
+public class EnvUtils {
+    public static Env getEnv() {
+        return threadLocal.get();
+    }
+
+    public static void removeEnv() {
+        threadLocal.remove();
+    }
+
+    //通过EnvUtils获取的Env实例是线程单例的
+    private static final ThreadLocal<Env> threadLocal = new ThreadLocal<Env>() {
+        @Override
+        protected Env initialValue() {
+            return new Env();
+        }
+    };
+
+}
+}}}
+