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spring_restful_json_jdbc
来源:http://blog.csdn.net/qduningning/article/details/27712137
使用Spring MVC +JDBC 实现输出Json数据和视图两种形式 最后面有源码
从web.xml开始配置:
声明定义两个Servlet分别是输出视图和json
- <!-- 声明一个Servlet 并进行配置 -->
- <servlet>
- <servlet-name>rest</servlet-name>
- <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
- <init-param>
- <param-name>contextConfigLocation</param-name>
- <param-value>/WEB-INF/rest-servlet.xml</param-value>
- </init-param>
- <!-- 标记容器是否在启动的时候就加载这个servlet 当是一个负数时或者没有指定时,则指示容器在该servlet被选择时才加载。正数的值越小,启动该servlet的优先级越高。 -->
- <load-on-startup>1</load-on-startup>
- </servlet>
- <servlet-mapping>
- <servlet-name>rest</servlet-name>
- <url-pattern>/rest/*</url-pattern>
- </servlet-mapping>
- <!-- 声明一个Servlet END -->
- <!-- 声明一个Servlet 并进行配置 -->
- <servlet>
- <servlet-name>json</servlet-name>
- <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
- <init-param>
- <param-name>contextConfigLocation</param-name>
- <param-value>/WEB-INF/json-servlet.xml</param-value>
- </init-param>
- </servlet>
- <servlet-mapping>
- <servlet-name>json</servlet-name>
- <url-pattern>/json/*</url-pattern>
- </servlet-mapping>
- <!-- 声明一个Servlet END -->
其他配置略过
首先是第一个Servlet – rest,指定的配置文件rest-servlet.xml(默认也是,,,)
- <?xml version="1.0" encoding="UTF-8"?>
- <beans xmlns="http://www.springframework.org/schema/beans"
- xmlns:context="http://www.springframework.org/schema/context"
- xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
- http://www.springframework.org/schema/context
- http://www.springframework.org/schema/context/spring-context-3.0.xsd
- http://www.springframework.org/schema/mvc
- http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
- <!-- 搜索Controller路径 -->
- <context:component-scan base-package="com.znn.rest.controller">
- <!-- 忽略这个包 -->
- <!-- <context:exclude-filter type="assignable" expression="com..."/> -->
- </context:component-scan>
- <!-- 简写形式 会自动注册DefaultAnnotationHandlerMapping与AnnotationMethodHandlerAdapter两个bean,是spring
- MVC为@Controllers分发请求所必须的。 -->
- <mvc:annotation-driven />
- <!-- 视图解析器 -->
- <bean
- class="org.springframework.web.servlet.view.InternalResourceViewResolver">
- <property name="prefix" value=http://www.mamicode.com/"/WEB-INF/jsp/" />
- <property name="suffix" value=http://www.mamicode.com/".jsp" />
- </bean>
- </beans>
在包com.znn.rest.controller下创建一个Controller:UserController.java
用注解@Controller进行声明这是一个Controller,Spring会自动扫描到
- package com.znn.rest.controller;
- import java.lang.reflect.Method;
- import java.util.List;
- import org.springframework.context.ApplicationContext;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
- import org.springframework.stereotype.Controller;
- import org.springframework.ui.Model;
- import org.springframework.web.bind.annotation.PathVariable;
- import org.springframework.web.bind.annotation.RequestHeader;
- import org.springframework.web.bind.annotation.RequestMapping;
- import org.springframework.web.bind.annotation.RequestMethod;
- import org.springframework.web.bind.annotation.RequestParam;
- import com.znn.dao.UserDao;
- import com.znn.vo.User;
- /**
- * RestFul 返回视图
- *
- * @author RANDY.ZHANG
- * 2014-5-7
- */
- @Controller
- public class UserController {
- ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
- UserDao dao = (UserDao) applicationContext.getBean("userDao");
- @RequestMapping("/hi")
- public String helloWorld(Model model) {
- model.addAttribute("msg", "Hello HelloWorld");
- return "hello";
- // return "redirect:hello.jsp";
- }
- @RequestMapping("/user/{id:\\d+}")
- public String getUser(Model model,@PathVariable("id") int userid) {
- User user;
- user = dao.queryAUser(userid);
- if (user == null) {
- model.addAttribute("tip", "<font color=‘red‘>用户不存在!</font>");
- }else {
- model.addAttribute("tip", user.toString());
- }
- return "user";
- }
- @RequestMapping(value = "/user/*",method=RequestMethod.GET)
- public String getAllUser(Model model) {
- List<User> list = dao.query();
- String tipString = "";
- for (int i = 0; i < list.size(); i++) {
- tipString += list.get(i).toString()+"<br />";
- }
- model.addAttribute("tip",tipString);
- return "user";
- }
- @RequestMapping(value = "/user",method=RequestMethod.GET)
- public String getAUser(Model model,
- @RequestParam(value=http://www.mamicode.com/"id",required=false,defaultValue=http://www.mamicode.com/"1") int userid,
- @RequestHeader("user-agent") String agent) {
- User user;
- user = dao.queryAUser(userid);
- if (user == null) {
- model.addAttribute("tip", "<font color=‘red‘>用户不存在!</font>");
- }else {
- model.addAttribute("tip", user.toString());
- }
- System.out.println(agent);
- return "user";
- }
- }
使用InternalResourceViewResolver进行视图适配,方法返回的字符串会自动添加上前后缀,另外还支持redirect:和forward:两种特殊配置,只是注意下要路径。
关于MVC的注解以及RequestMapping的配置用法到:http://docs.spring.io/spring-framework/docs/current/spring-framework-reference/html/mvc.html#mvc-introduction,里面讲的挺详细。
第二种输出JSON:
从Spring 3.1开始支持@ResponseBody来直接将数据返回到HTTP响应体重,不在需要ModalView或者其他进行渲染。Spring提供了一些HttpMessageConverter来对数据进行转换,比如StringHttpMessageConverter,FormHttpMessageConverter,MappingJackson2HttpMessageConverter ,其他见这里,这里用到了StringHttpMessageConverter用来进行编码转换,MappingJackson2HttpMessageConverter 用来将数据转为Json形式。
json-servlet.xml
- <?xml version="1.0" encoding="UTF-8"?>
- <beans xmlns="http://www.springframework.org/schema/beans"
- xmlns:context="http://www.springframework.org/schema/context"
- xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
- http://www.springframework.org/schema/context
- http://www.springframework.org/schema/context/spring-context-3.0.xsd
- http://www.springframework.org/schema/mvc
- http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
- <!-- 搜索Controller路径 -->
- <context:component-scan base-package="<strong>com.znn.json.controller</strong>">
- <!-- 忽略这个包 -->
- <!-- <context:exclude-filter type="assignable" expression="com..."/> -->
- </context:component-scan>
- <!-- Spring 3.1之后开始用这两个 -->
- <bean
- class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />
- <bean
- class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
- <property name="messageConverters">
- <list>
- <bean
- class="org.springframework.http.converter.StringHttpMessageConverter">
- <property name="supportedMediaTypes">
- <list>
- <value>text/html; charset=UTF-8</value>
- </list>
- </property>
- </bean>
- <bean
- class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
- <property name="supportedMediaTypes">
- <list>
- <value>text/html; charset=UTF-8</value>
- </list>
- </property>
- </bean>
- </list>
- </property>
- </bean>
- </beans>
从3.1开始推荐使用RequestMappingHandlerMapping和RequestMappingHandlerAdapter来代替DefaultAnnotationHandlerMapping和AnnotationMethodHandlerAdapter。不过不换也木事。。。。
在com.znn.json.controller下新建一个Controller
UserJson.java
- package com.znn.json.controller;
- import java.util.List;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import org.springframework.context.ApplicationContext;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
- import org.springframework.stereotype.Controller;
- import org.springframework.ui.Model;
- import org.springframework.web.bind.annotation.PathVariable;
- import org.springframework.web.bind.annotation.RequestMapping;
- import org.springframework.web.bind.annotation.RequestMethod;
- import org.springframework.web.bind.annotation.ResponseBody;
- import com.znn.dao.UserDao;
- import com.znn.vo.User;
- /**
- * 返回@ResponseBody需要配置HttpMessageConverters
- *
- * @author RANDY.ZHANG
- * 2014-5-7
- */
- @Controller
- public class UserJson {
- ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
- UserDao dao = (UserDao) applicationContext.getBean("userDao");
- @RequestMapping("/hi")
- public @ResponseBody String helloWorld(Model model) {
- // model.addAttribute("msg", "Hello HelloWorld");
- return "hello world";
- // return "redirect:hello.jsp";
- }
- @RequestMapping("/user/{id:\\d+}")
- public @ResponseBody User getUser(Model model,@PathVariable int id) {
- User user;
- user = dao.queryAUser(id);
- if (user == null) {
- model.addAttribute("tip", "<font color=‘red‘>用户不存在!</font>");
- }else {
- model.addAttribute("tip", user.toString());
- }
- return user;
- }
- @RequestMapping(value = {"/user/*","/user"},method=RequestMethod.GET)//,produces="application/json" 406
- public @ResponseBody List<User> getAllUser(Model model) {
- List<User> list = dao.query();
- String tipString = "";
- for (int i = 0; i < list.size(); i++) {
- tipString += list.get(i).toString()+"<br />";
- }
- model.addAttribute("tip",tipString);
- return list;
- }
- @RequestMapping(value = "/user/aaa",method=RequestMethod.GET)
- public @ResponseBody List<User> getTest(Model model,HttpServletResponse response, HttpServletRequest request) {
- List<User> list = dao.query();
- String tipString = "";
- for (int i = 0; i < list.size(); i++) {
- tipString += list.get(i).toString()+"<br />";
- }
- model.addAttribute("tip",tipString);
- return list;
- }
- }
木有啥好说的….
跟JDBC连接的及DAO层代码和http://www.erdian.net/?p=141是一样的,不再写。
源码:https://github.com/qduningning/SpringAll
spring_restful_json_jdbc