SpringMVC的几种数据响应方式

pom.xml

@@ -70,6 +70,8 @@
             <artifactId>lombok</artifactId>
             <version>1.18.20</version>
         </dependency>
+
+
     </dependencies>
 
 </project>

springMvc/pom.xml

@@ -71,6 +71,22 @@
       <version>2.3.3</version>
       <scope>provided</scope>
     </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-core</artifactId>
+      <version>2.9.8</version>
+    </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-databind</artifactId>
+      <version>2.9.8</version>
+    </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-annotations</artifactId>
+      <version>2.9.8</version>
+    </dependency>
+
   </dependencies>
 
 </project>

springMvc/src/main/java/com/controller/DataResponseController.java

@@ -0,0 +1,46 @@
+package com.controller;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+/**
+ * 数据相应
+ */
+
+@Controller
+public class DataResponseController {
+    // 返回 modelAndView
+    @RequestMapping("/modelView1")
+    public ModelAndView modelView1() {
+        // 直接返回字符串
+        ModelAndView modelAndView = new ModelAndView();
+        modelAndView.addObject("name","Mr.zhang");
+        modelAndView.setViewName("template/index.jsp");
+        return modelAndView;
+    }
+
+    // 返回 modelAndView 参数可以自动注入
+    @RequestMapping("/modelView2")
+    public ModelAndView modelView2(ModelAndView modelAndView) {
+        // 直接返回字符串
+        modelAndView.addObject("name","Mr.zhang");
+        modelAndView.setViewName("template/index.jsp");
+        return modelAndView;
+    }
+
+    // 可以单独设置 Model
+    @RequestMapping("/modelView3")
+    public String modelView3(Model model) {
+        model.addAttribute("name","modelName");
+        return "template/index.jsp";
+    }
+
+
+
+}

springMvc/src/main/java/com/controller/UserController.java

@@ -1,13 +1,18 @@
 package com.controller;
 
+import com.pojo.Student;
 import org.aopalliance.intercept.Interceptor;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.servlet.ModelAndView;
 
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
 
 @Controller
 public class UserController {
@@ -20,12 +25,35 @@ public class UserController {
         // 加了前后缀 完整链接应该是 forward:/template/success.jsp
         return "redirect:http://baidu.com";
     }
+    // 回写数据 返回字符串
     @RequestMapping("/save")
     public void save(HttpServletRequest request, HttpServletResponse response) throws IOException {
         // 直接返回字符串
-        System.out.println("1213");
         response.getWriter().println("save");
-//        return "forward:success.jsp";
 
     }
+    // 回写数据 使用注解进行返回字符串
+    @RequestMapping("/save2")
+    @ResponseBody // 不进行视图跳转，直接进行数据响应
+    public String save2() {
+        return "save2";
+    }
+    // 回写数据 返回对象
+    @RequestMapping("/save3")
+    @ResponseBody // 不进行视图跳转，直接进行数据响应
+    public Student save3() {
+        Student student = new Student();
+        student.setName("woshinishiws");
+        return student;
+    }
+    // 回写数据 返回对象
+    @RequestMapping("/save4")
+    @ResponseBody // 不进行视图跳转，直接进行数据响应
+    public Map save4() {
+        HashMap<String, String> stringStringHashMap = new HashMap<String, String>();
+        stringStringHashMap.put("1","2");
+        return stringStringHashMap;
+    }
+
+
 }

springMvc/src/main/java/com/pojo/Student.java

@@ -0,0 +1,13 @@
+package com.pojo;
+
+public class Student {
+    public String name;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

springMvc/src/main/resources/Spring-mvc.xml

@@ -28,4 +28,13 @@
 <!--               <bean class="com.interceptor.MyInterceptor2"></bean>-->
 <!--           </mvc:interceptor>-->
 <!--       </mvc:interceptors>-->
+<!--    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">-->
+<!--        <property name="messageConverters">-->
+<!--            <list>-->
+<!--                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>-->
+<!--            </list>-->
+<!--        </property>-->
+
+<!--    </bean>-->
+        <mvc:annotation-driven></mvc:annotation-driven>
 </beans>

springMvc/src/main/webapp/template/index.jsp

@@ -11,6 +11,6 @@
     <title>Title</title>
 </head>
 <body>
-<h1>hello world</h1>
+<h1>hello world ${name}</h1>
 </body>
 </html>