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src/main/java/com/example/demo/SpringBootStartApplication.java

+package com.example.demo;
+
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
+
+/**
+ * @author luhaoyuan
+ * @date 2018/9/27
+ * @desc
+ */
+public class SpringBootStartApplication extends SpringBootServletInitializer {
+
+    @Override
+    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
+        // 注意这里要指向原先用main方法执行的Application启动类
+        return builder.sources(DemoApplication.class);
+    }
+}