SpringMVC框架下实现JSON（类方法中回传数据到jsp页面，使用jQuery方法回传）
JSON的实现，即将需要的数据回传到jsp页面；
1>.加入实现Json的三个架包到lib中；
2>.目标方法上边加入注解，需要返回的值
3>.在jsp页面中书写jQuery方法；
eclipse中javaEE环境下的web.xml文件配置为：
<?xml version="1.0" encoding="UTF-8"?> <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" id="WebApp_ID" version="2.5"> <!-- 配置SpringMVC的DispatcherServlet --> <servlet> <servlet-name>springDispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springDispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <!-- 配置 HiddenHttpMethodFilter: 把 POST 请求转为 DELETE、PUT 请求 --> <filter> <filter-name>HiddenHttpMethodFilter</filter-name> <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class> </filter> <filter-mapping> <filter-name>HiddenHttpMethodFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
spring的bean的配置文件为：springmvc.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> <!-- 配置自动扫描的包 --> <context:component-scan base-package="com.atguigu.springmvc"></context:component-scan> <!-- 配置视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/views/"></property> <property name="suffix" value=".jsp"></property> </bean> <!-- default-servlet-handler 将在 SpringMVC 上下文中定义一个 DefaultServletHttpRequestHandler, 它会对进入 DispatcherServlet 的请求进行筛查, 如果发现是没有经过映射的请求, 就将该请求交由 WEB 应用服务器默认的 Servlet 处理. 如果不是静态资源的请求，才由 DispatcherServlet 继续处理 一般 WEB 应用服务器默认的 Servlet 的名称都是 default. 若所使用的 WEB 服务器的默认 Servlet 名称不是 default，则需要通过 default-servlet-name 属性显式指定 --> <mvc:default-servlet-handler/> <!-- 一般都会配置这个 <mvc:annotation-driven ></mvc:annotation-driven>， 由于。。。requestmapping请求实现不了，使用这个，会使requestmapping请求一定实现 --> <mvc:annotation-driven></mvc:annotation-driven> </beans>
EmployeeDao类：
package com.atguigu.springmvc.crud.dao; import java.util.Collection; import java.util.HashMap; import java.util.Map; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Repository; import com.atguigu.springmvc.crud.entities.Department; import com.atguigu.springmvc.crud.entities.Employee; @Repository//标识持久层组件 public class EmployeeDao { private static Map<Integer, Employee> employees=null; @Autowired private DepartmentDao departmentDao; static{ employees=new HashMap<Integer, Employee>(); employees.put(1001, new Employee(1001, "E-AA", "aa@163.com", 1, new Department(101, "D-AA"))); employees.put(1002, new Employee(1002, "E-BB", "bb@163.com", 1, new Department(102, "D-BB"))); employees.put(1003, new Employee(1003, "E-CC", "cc@163.com", 0, new Department(103, "D-CC"))); employees.put(1004, new Employee(1004, "E-DD", "dd@163.com", 0, new Department(104, "D-DD"))); employees.put(1005, new Employee(1005, "E-EE", "ee@163.com", 1, new Department(105, "D-EE"))); } private static Integer initId=1006; //添加数据的方法 public void save(Employee employee){ if(employee.getId()==null){ employee.setId(initId++); } employee.setDepartment(departmentDao.getDepartment(employee.getDepartment().getId())); employees.put(employee.getId(), employee); } //获取全部的数据的方法 public Collection<Employee> getAll(){ return employees.values(); } //获取集合中的一个数据 public Employee getEmployee(Integer id){ return employees.get(id); } //删除集合中的一个数据 public void delect(Integer id){ employees.remove(id); } }
实现的handler 类方法：SpringMVCTest:
@Controller public class SpringMVCTest { @Autowired private EmployeeDao employeeDao;/* * JSON的实现，即将需要的数据回传到jsp页面； * 1>.加入实现Json的三个架包到lib中； * 2>.目标方法上边加入注解，需要返回的值 * 3>.在jsp页面中书写jQuery方法； * */ @ResponseBody @RequestMapping("/testJson") public Collection<Employee> testJson(){ return employeeDao.getAll(); } }
jsp页面：index.jsp；需要导入jQuery架包，并且用jQuery方法，实现数据回显到jsp页面；点击
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script type="text/javascript" src="scripts/jquery-1.9.1.min.js"></script> <script type="text/javascript"> $(function(){ $("#testJson").click(function(){ var url=this.href; var args={}; $.post(url,args,function(data){ for(var i=0;i<data.length;i++){ var id=data[i].id; var lastName=data[i].lastName; alert(id+":"+lastName); } }); }); }) </script> </head> <body> <a href="testJson" id="testJson">Test Json</a> <br><br> </body> </html>
