add freemarker configure temple util sample in springboot

Author: ipipman

springboot-freemarker-sample/src/main/java/com/ipman/freemarker/sample/controller/HelloWorld.java renamed to springboot-freemarker-sample/src/main/java/com/ipman/freemarker/sample/controller/Demo.java

@@ -1,10 +1,17 @@
 package com.ipman.freemarker.sample.controller;
 
 import com.ipman.freemarker.sample.entity.Student;
+import freemarker.template.Template;
+import freemarker.template.TemplateException;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
+import org.springframework.ui.freemarker.FreeMarkerTemplateUtils;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.servlet.ModelAndView;
+import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -17,14 +24,14 @@
 * @date 2021/9/23 5:28 下午
 */
 @Controller
-public class HelloWorld {
+public class Demo {
 
 /**
 * 测试Freemarker模版
 */
-@GetMapping("/hello")
-public ModelAndView hello() {
-ModelAndView model = new ModelAndView("hello");
+@GetMapping("/demo")
+public ModelAndView demo() {
+ModelAndView model = new ModelAndView("demo");
 model.addObject("userName", "ipman");
 // 返回模板名称
 return model;
@@ -33,9 +40,9 @@ public ModelAndView hello() {
 /**
 * 测试Freemarker对象与列表渲染
 */
-@GetMapping("/hello1")
-public ModelAndView hello1() {
-ModelAndView model = new ModelAndView("hello1");
+@GetMapping("/demo1")
+public ModelAndView demo1() {
+ModelAndView model = new ModelAndView("demo1");
 List<Student> list = new ArrayList<>();
 Student s1 = new Student();
 s1.setIdNo("No1");
@@ -49,4 +56,5 @@ public ModelAndView hello1() {
 return model;
 }
 
+
 }

springboot-freemarker-sample/src/main/java/com/ipman/freemarker/sample/controller/Demo1.java

@@ -0,0 +1,52 @@
+package com.ipman.freemarker.sample.controller;
+
+import com.ipman.freemarker.sample.entity.Student;
+import freemarker.template.Template;
+import freemarker.template.TemplateException;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.ui.freemarker.FreeMarkerTemplateUtils;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+* Created by ipipman on 2021/9/23.
+*
+* @version V1.0
+* @Package com.ipman.freemarker.sample.controller
+* @Description: (用一句话描述该文件做什么)
+* @date 2021/9/23 6:17 下午
+*/
+@RestController
+public class Demo1 {
+
+@Autowired
+private FreeMarkerConfigurer freeMarkerConfigurer;
+
+/**
+* 根据Freemarker模版渲染引擎，渲染HTML代码
+*/
+@GetMapping("/demo2")
+public String demo2() throws IOException, TemplateException {
+List<Student> list = new ArrayList<>();
+Student s1 = new Student();
+s1.setIdNo("No1");
+s1.setName("ipman");
+list.add(s1);
+Student s2 = new Student();
+s2.setIdNo("No2");
+s2.setName("ipipman");
+list.add(s2);
+Map<String, Object> param = new HashMap<>();
+param.put("students", list);
+// 根据Freemarker模版渲染引擎，渲染HTML代码
+Template template = freeMarkerConfigurer.getConfiguration().getTemplate("demo1.ftl");
+return "html=[" + FreeMarkerTemplateUtils.processTemplateIntoString(template, param) + "]";
+}
+}