01 json环境搭建【spring + pringMVC】

1 导包

 1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 2   <modelVersion>4.0.0</modelVersion>
 3   <groupId>cn.xiangxu.note</groupId>
 4   <artifactId>testNote</artifactId>
 5   <version>0.0.1-SNAPSHOT</version>
 6   <packaging>war</packaging>
 7   <dependencies>
 8       <dependency>
 9           <groupId>org.springframework</groupId>
10           <artifactId>spring-webmvc</artifactId>
11           <version>3.2.8.RELEASE</version>
12       </dependency>
13       <dependency>
14           <groupId>com.fasterxml.jackson.core</groupId>
15           <artifactId>jackson-annotations</artifactId>
16           <version>2.2.3</version>
17       </dependency>
18       <dependency>
19           <groupId>com.fasterxml.jackson.core</groupId>
20           <artifactId>jackson-core</artifactId>
21           <version>2.2.3</version>
22       </dependency>
23       <dependency>
24           <groupId>com.fasterxml.jackson.core</groupId>
25           <artifactId>jackson-databind</artifactId>
26           <version>2.2.3</version>
27       </dependency>
28   </dependencies>
29 </project>

jar包的pom.xml

2 配置实体类

　　> 有包

　　> 实现序列化接口【要添加序列版本号】

　　> 有无参构造器

　　> 生成set/get方法【serialVersionUID不用实现】

　　> 生成toString方法

　　> 有id属性的实体类需要重写equals/hashcode方法【只选id就行啦】

  1 package cn.xiangxu.testNote.entity;
  2 
  3 import java.io.Serializable;
  4 
  5 public class User implements Serializable {
  6 
  7     private static final long serialVersionUID = 8786891263198147115L;
  8     
  9     private Integer id;
 10     private String name;
 11     private String address;
 12     
 13     public User(Integer id, String name, String address) {
 14         super();
 15         this.id = id;
 16         this.name = name;
 17         this.address = address;
 18     }
 19     public User() {
 20         super();
 21         // TODO Auto-generated constructor stub
 22     }
 23     public Integer getId() {
 24         return id;
 25     }
 26     public void setId(Integer id) {
 27         this.id = id;
 28     }
 29     public String getName() {
 30         return name;
 31     }
 32     public void setName(String name) {
 33         this.name = name;
 34     }
 35     public String getAddress() {
 36         return address;
 37     }
 38     public void setAddress(String address) {
 39         this.address = address;
 40     }
 41     @Override
 42     public String toString() {
 43         return "User [id=" + id + ", name=" + name + ", address=" + address + "]";
 44     }
 45     @Override
 46     public int hashCode() {
 47         final int prime = 31;
 48         int result = 1;
 49         result = prime * result + ((id == null) ? 0 : id.hashCode());
 50         return result;
 51     }
 52     @Override
 53     public boolean equals(Object obj) {
 54         if (this == obj)
 55             return true;
 56         if (obj == null)
 57             return false;
 58         if (getClass() != obj.getClass())
 59             return false;
 60         User other = (User) obj;
 61         if (id == null) {
 62             if (other.id != null)
 63                 return false;
 64         } else if (!id.equals(other.id))
 65             return false;
 66         return true;
 67     }
 68     
 69 }
 70 package cn.xiangxu.testNote.entity;
 71 
 72 import java.io.Serializable;
 73 
 74 public class User implements Serializable {
 75 
 76     private static final long serialVersionUID = 8786891263198147115L;
 77     
 78     private Integer id;
 79     private String name;
 80     private String address;
 81     
 82     public User(Integer id, String name, String address) {
 83         super();
 84         this.id = id;
 85         this.name = name;
 86         this.address = address;
 87     }
 88     public User() {
 89         super();
 90         // TODO Auto-generated constructor stub
 91     }
 92     public Integer getId() {
 93         return id;
 94     }
 95     public void setId(Integer id) {
 96         this.id = id;
 97     }
 98     public String getName() {
 99         return name;
100     }
101     public void setName(String name) {
102         this.name = name;
103     }
104     public String getAddress() {
105         return address;
106     }
107     public void setAddress(String address) {
108         this.address = address;
109     }
110     @Override
111     public String toString() {
112         return "User [id=" + id + ", name=" + name + ", address=" + address + "]";
113     }
114     @Override
115     public int hashCode() {
116         final int prime = 31;
117         int result = 1;
118         result = prime * result + ((id == null) ? 0 : id.hashCode());
119         return result;
120     }
121     @Override
122     public boolean equals(Object obj) {
123         if (this == obj)
124             return true;
125         if (obj == null)
126             return false;
127         if (getClass() != obj.getClass())
128             return false;
129         User other = (User) obj;
130         if (id == null) {
131             if (other.id != null)
132                 return false;
133         } else if (!id.equals(other.id))
134             return false;
135         return true;
136     }
137     
138 }

实体类

3 在web.xml配置文件中配置前端控制器、spring容器

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
 3   <display-name>testNote</display-name>
 4   <welcome-file-list>
 5     <welcome-file>index.html</welcome-file>
 6     <welcome-file>index.htm</welcome-file>
 7     <welcome-file>index.jsp</welcome-file>
 8     <welcome-file>default.html</welcome-file>
 9     <welcome-file>default.htm</welcome-file>
10     <welcome-file>default.jsp</welcome-file>
11   </welcome-file-list>
12   
13   <!-- 配置前端控制器 -->
14   <servlet>
15       <servlet-name>mvc</servlet-name>
16       <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
17       <init-param> <!-- 通过参数注入的方式配置spring容器 -->
18           <param-name>contextConfigLocation</param-name>
19           <param-value>classpath:conf/spring_*.xml</param-value>
20       </init-param>
21   </servlet>
22   <servlet-mapping>
23       <servlet-name>mvc</servlet-name>
24       <url-pattern>*.do</url-pattern>
25   </servlet-mapping>
26   
27 </web-app>

web.xml

4 在spring.xml文件中配置组件扫描和mvc注解扫描

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans" 
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:context="http://www.springframework.org/schema/context" 
 5     xmlns:jdbc="http://www.springframework.org/schema/jdbc"  
 6     xmlns:jee="http://www.springframework.org/schema/jee" 
 7     xmlns:tx="http://www.springframework.org/schema/tx"
 8     xmlns:aop="http://www.springframework.org/schema/aop" 
 9     xmlns:mvc="http://www.springframework.org/schema/mvc"
10     xmlns:util="http://www.springframework.org/schema/util"
11     xmlns:jpa="http://www.springframework.org/schema/data/jpa"
12     xsi:schemaLocation="
13         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
14         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
15         http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
16         http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
17         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
18         http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
19         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
20         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
21         http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">
22     
23     <!-- 启用mvc注解驱动 -->
24     <mvc:annotation-driven></mvc:annotation-driven>
25     
26     <!-- 组件扫描
27         注意：可以同时配置多个包，包之间用逗号隔开;可以不用写到具体哪个包 -->
28     <context:component-scan base-package="cn.xiangxu.testNote,com.xiangxu"></context:component-scan>
29     
30     
31 </beans>

spring_mvc.xml

5 编写请求分发代码

 1 package cn.xiangxu.testNote.web;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.RequestMapping;
 5 import org.springframework.web.bind.annotation.ResponseBody;
 6 
 7 import cn.xiangxu.testNote.entity.User;
 8 
 9 @Controller
10 public class TestController {
11     
12     @RequestMapping("/json.do")
13     @ResponseBody
14     public User json() {
15         User user = new User(333, "warrior", "重庆/虎门");
16         return user;
17     }
18 }

请求分发代码

6 启动Tomcat进行测试

7 项目结构【eclipse中的maven工程】

来源：https://www.cnblogs.com/NeverCtrl-C/p/6924032.html

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servlet

schema